Meriam Selected Product Catalogue

NEW! Easier. Faster.
Affordable!

MFC5150x Intrinsically Safe,
HART-®Compliant Communicator

Communicate • Reads manufacturers’ DDs in their
with ANY
native format — no translations needed
registered or
non-registered • HART®-compliant modem
HART®-compliant
communicates with any registered or
device! unregistered HART ® Device
Charger included with
• Ergonomic, handheld design
integrated USB connectivity • Enhanced 4.3” diagonal anti-glare

touchscreen with color graphic display
(no stylus required)

• Full QWERTY keyboard for

commissioning new transmitters

• On Demand Help Menus and teachable

device-specific short cuts

• More than twice the battery capacity of

any handheld communicator

• Manage device information through

PC connection

• Integrated multi-language support

The MFC5150 is certified in the following Hazardous locations: • Class I, Division I Group IIC (US/Canada)
• ATEX Zone 0 Group IIC (Europe) • IECex Zone 0 Group IIC (Asia, South America, Africa)

Find out more at www.meriam.com

Or contact us at: 216.281.1100 | E-mail: [email protected]

The MFC5150x utilizes a Windows™ based system for faster processing and greater
storage capacity. Plus, no subscriptions, and with all options standard at no extra
cost, it’s more affordable than ever. It’s the Power of a PC in the palm of your hand!

Display Type Transflective Display with anti-glare Enclosure Rating Body IP51
touch screen (Resistance film)
Size 4.3-inch WQVGA Shock condition Tested to survive a 1 meter drop onto concrete
Color 24bit (16,777,216) TFT color
Pixel 480 X 272 pixels HART® connections Form Two 4mm banana plugs
Backlight White LED
Storage Media type microSD card
Body Size 303×142×48 mm [11.9×5.6×1.9 inch] Capacity 4GB Minimum
Weight Approximately 0.95 Kg [2.1 lbs] with battery
USB Data rate Supporting up to 115 kbps
Keyboard Material Molded Keyboard design with tactile feedback Form USB B type (receptacle)
Key 52 keys including qwerty keys
Power supply AC adapter Wall Adapter
Included Handy carry Ballistic Nylon; inside material black 420 Nylon Form Four international inserts (US-U,UK-B,EU-E,AU-A)
A ccessories case material
HART® leads Molded banana plug test leads Intrinsic Safety ANSI/ISA (US) UL913 Ed7 CL I, DIV 1, GP A,B,C,D; T4
1 meter long UL60079-0 Ed5 CL I, ZONE 0, AEx ia IIC T4
Strap Wrist strap UL60079-11 Ed5 CL I, DIV 1, GP A,B,C,D; T4
USB cable 2 meter Type A to USB Type B ANSI/ISA (Canada) CSA-C22.2 CL I, ZONE 0, Ex ia IIC T4
CD-ROM Manual/Drivers NO. 157-92(R2012) II 1 G Ex ia IIC T4 Ga
NO. 60079-0:11 Ex ia IIC T4 Ga
NO. 60079-11:11
ATEX (Europe) EN60070-0:2012
Power Rechargeable Li-Ion EN60079-11:2012
Battery EN60079-26:2007
IECEx IEC60079-0:2011 Ed6
Standby/ Continuance 10 hours (International) IEC60079-11:2011 Ed6
Hibernate IEC60079-26:2006 Ed2
Standard 20 hours
Standby/Hibernate 200 hours
Rechargeable
battery FCC (US), CE (Europe) FCC (US) EN61326-1
Voltage output 3.7VDC CE (Europe) EN61326-2-3
Current capacity 2000mA C-tick (Australia)
Energy capacity 9480mAh ANSI-ISA
Charging time 6 hours

Battery Charger Electrical Equipment UL (US) UL61010-1 Ed3
(AC adapter) Input voltage Safety ANSI (US) UL60950-1 AC Adapter
Output voltage 100-240VAC 50/60Hz CSA (Canada) CSA-C22.2
Output current 15VDC NO. 61010-1-12
1600mA CE (Europe) EN60950-1 AC Adapter
Overcharge Yes
protection Environmental RoHS Directive 2011/65/EU
N/A Protection WEEE Directive 2002/96/EC
LED indication REACH Regulation (EC) No 1907/2006
Yes, Tri color LED
Battery Charger +14°F (-10°C) to +122°F (+50°C)
0% to 95% RH (non-condensing) Transportation IATA UN/DOT 38.3 Li-ion Battery
(Cradle) LED indication (for +32°F (0°C) to +122°F (+50°C))
-4°F (-20°C) to +131°F (+55°C)
Normal Ambient temp. Field Communication Host
-4°F (-20°C) to +150°F (+60°C)
operating Windows™ CE 6.0 Manufacture Microsoft
Condition Ambient humidity 0% to 95% RH (non-condensing) Revision Windows™ CE Rev3
(for +32°F (0°C) to +122°F (+50°C))
0% to 95% RH (non-condensing) (for +32°F
(0°C) to +122°F (+50°C)) External device FlashROM NAND 512MByte
Storage Ambient temp. +50°F (+10°C) to +104°F (+40°C) RAM DDR 256mb
condition with battery 0% to 95% RH (non-condensing)
Only safety area when charging
Ambient temp. Languages supported English, French, Japanese, Italian, Spanish, Chinese, Russian, German
without battery
Applicable Equipment
Ambient humidity Registered/unregistered devices in HART FOUNDATION
with battery
HART® protocol HART5, 6, 7
Ambient humidity revision
without battery
Ambient temp.
Charging Ambient humidity
condition Other


Find out more at www.meriam.com

Or contact us at: 216.281.1100 | E-mail: [email protected]

Meri-Cal II

Model 3600 & 3610 Pressure Calibrator

Model 3600 Meri-Cal II is a microprocessor
based pressure calibrator with 5 digit resolution
and NIST traceability. Two pressure sensors and
one electrical sensor installed in the Meri-Cal II
will allow measurement of differential and static
pressure, plus current and voltage in one unit.
Any two of these measurements are displayed
on a 4 line by 20 character alphanumeric display,
making calibration of transmitters and
transducers easy.

The Model 3610 Meri-Cal II incorporates a
convenient Data Logging mode and on-board
memory to provide calibration documentation at
the stroke of a key. Calibration procedures can
be set up quickly using the Windows ‘95 Data
Logging Program. Up to 20 PC Calibration files
of up to 20 points each can be downloaded from
a PC. This allows the 3610 to prompt the user
with required calibration points. Another 20
Manual Calibrations files can be stored directly
through the keypad.

Specifications

• Approvals: CE compliant (Optional) • Media compatibility: Non-isolated sensor (DN) for
clean, dry, non-corrosive gases. Isolated sensor (GI
• Display: 4 line x 20 character alpha-numeric 5 full and AI) for fluids compatible with 316ss.
digit resolution
• Pressure limits: Twice range on GI/AI units. Twice
• NIST traceability: NIST certificate supplied for all range on DN units when pressurized on high side
models. only and 150 PSI (10.5 Kg/cm2) static when applied
to both sides of the sensor simultaneously.
• Power: 9-volt alkaline battery with user enabled
automatic shut-off. • Enclosure: 30 ounces. (8.5”L x 5.2”W x 3.0”D) ABS
plastic case
• Optional 9 volt lithium batteries can also be used and
are recommended below 32˚ F (0˚ C). • Accuracy: Pressure sensor ± 0.05% of F.S. or
optional ± 0.025% of F.S.
• Temperature: Electrical measurements ± 0.025% of F.S. Accuracy
Storage: -40˚F to 140˚F (-40 to 60˚C) includes all effects of linearity, repeatability, hysteresis
Operating: 23˚F to 122˚F (-5 to 50˚C) and temperature over the range 23˚F to 122˚F

• Process connection: 1/8” female NPT, 316ss

3600 Standard Features • MIN/MAX capture - minimum and maximum measured
• Selectable Engineering Units - PSI, inches H2O (4˚C, values are captured. Capture speed is equal to the selected
damping rate.
20˚C, and 60˚F references), kg/cm2, Kilopascals, mBars,
Bars, mm Hg, inches Hg, cm H2O, user definable units. • HOLD - toggle on/off function freezes display.
• Auto Shut-off - occurs after 10 minutes without a
new keystroke. User can disable this feature. • ZERO - provides automatic re-zeroing of the sensors.
• DAMPING (averaging) - selectable from 0.1 to 25 Soft Carrying Case with adjustable shoulder strap.
seconds to dampen pulsation and stabilize the display.

4

Meri-Cal II

Model 3600 & 3610 Pressure Calibrator

3610 Features (Additional to 3600) • Manual Data Logging Mode - field defined data logging
for transmitter or transducer calibrations or documenta-
• Memory - Non-volatile data-logging memory for 40 tion of local indicators or flow computers.
calibration files with up to 20 points per file.
• DB-9 serial connector - used for downloading
• PC Data Logging Mode - prompts user to follow calibr- calibration files from a PC to the 3610 and for uploading
tion procedures downloaded from a PC (Requires stored calibration results to the PC (Requires Optional
Optional Software). Stores AS FOUND and AS LEFT Software)
data in memory.

Ordering Information

MERI-CAL II (includes current / voltage sensor): 3610 Adds onboard memory card and PC Data
3600 Select one or optionally two sensors from logging to the model 3600(Requires software and
selection below. Order same accuracy for units cable- see accessories)
with two sensors.

SENSORS:

.05% DN0200 0-200” H2O Differential .025% DN0200 0-200” H2O Differential
DN2000 0-2000” H2O Differential DN2000 0-2000” H2O Differential
GI0020 0-20 PSI Gauge GI0020 0-20 PSI Gauge
GI0200 0-200 PSI Gauge GI0200 Gauge
GI2000 0-2000 PSI Gauge GI2000 0-200 PSI Gauge
AI2000 0-2000 mm Hg Absolute AI2000 Absolute
0-2000 PSI
.1%
0-2000 mm Hg

DN0020 0-20” H2O Differential

To Order a Meri-Cal II with 200” Differential and 2000 PSI sensor with .025% accuracy. The order code
is as follows: 3600-DN0200-GI2000-025 (add “-025” extension for accuracy).
Consult factory or your local Meriam Representative for Pricing

MERI-CAL II MODEL 3610 DATA LOGGING and
COMMUNICATIONS SOFTWARE for PC’s

The Data Logging and Communications Software for the Meri-Cal II is Windows ‘95 compatible.
Features for the program include:

• SET TIME button to synchronize the Meri-Cal II real time clock with the PC’s.
• DATA ACQ provides automated data acquisition (10Hz rate) using the PC with the Meri-Cal II.

The Meri-Cal II Model 3610 will function as a data logging calibrator for pressure and electrical signal
in the PC Data Logging Mode.
• CREATE CAL FILE facilitates the uniform creation of individual calibration files for each transmitter
or transducer ID number. After entering a Serial/Tag # of up to 15 characters, Channel 1 and 2
Sensors are defined by clicking on the sensor type and desired units for each. The software allows up
to 20 PC Calibration and 20 manual (20 points each) calibration files to be uploaded to the 3610.
• SEND PC CAL FILES downloads selected files to the Meri-Cal II.
• RECEIVE PC (and MANUAL) CAL FILES uploads stored calibration data from the Meri-Cal II to the PC.
• PRINT commands allow printing of calibration data previously uploaded to the PC.

The Meri-Cal II guides the user through the calibration procedure.
The PC interface option allows for the display of PREV: the most
recent as left data, FOND: the present as found data, and NOML:
The desired present point to calibrate as programmed through
the PC interface. With a simple keystroke this information is
stored in non-volatile memory. The Meri-Cal II is then interfaced
with the host PC for long-term information storage and printing
of calibration certificates.

5

3900 /3910 Digital Pressure Gauge

The MERIGAUGE digital pressure gauge from Meriam Instrument successfully addresses the modern demands
of process pressure measurement. Pressure ranges are available to 6,000 PSIG at standard accuracy of ± 0.25%
of Full Scale and optional accuracy of ± 0.10% of full scale. A combination gauge that can be used for positive
pressure measurements and vacuum measurements is also available. The standard gauge is powered by two 9
volt alkaline or lithium batteries. Externally powered units are available. The pressure display is a 4 1⁄2" digit
LCD with 0.6" high numerals. Each gauge includes 12 field selectable engineering units. The selectable units
include PSIG, feet of water, inches of water, inches of the mercury, Bar, millimeters of mercury, kilopascals and
user configurable units. In addition to numeric pressure indication, visual indication of the pressure is repre-
sented by an adjustable vertical bar graph on the left side of the display. Other standard features include
Min/Max query, Zeroing, selectable Damping, selectable program Lock-out, adjustable display shutoff and field
recalibration and adjustable display shutoff (for battery powered models). The housing is 304 stainless steel and
NEMA 4 rated. Wetted components are 316 stainless steel for compatibility with many process fluids. Process
connection is via a 1⁄4" MNPT 316 stainless steel stem.

Typical applications are instrumentation and control in the process industries, hydraulics, pneumatics,
industrial gases and OEM’s. Options such as panel mounting, 24 Vdc powered units, 4 to 20 mA output,
adjustable SPDT relay outputs, and various style diaphragm seals add to the versatility of the MERIGAUGE.

3900/3910 MERIGAUGE Ordering Information

±0.25% FS Models Pressure Ranges Options
3900-GI0010-XX-Y-ZZ 0 - 10 PSIG XX= 01: Pipe Mount (battery power)
3900-GI0050 " 0 - 50 PSIG
3900-GI0100 " 0 - 100 PSIG 02: Pipe Mount (external power)
3900-GI0500 " 0 - 500 PSIG 03: Panel Mount (battery power)
3900-GI1000 " 0 - 1000 PSIG 4: Panel Mount (external power)
3900-GI1500 " 0 - 1500 PSIG Y= 1: Battery Power
3900-GI3000 " 0 - 3000 PSIG 2: 24VDC Power (2 wire)
3900-GI5000 " 0 - 5000 PSIG 3: 4-20mA output (2 wire)
3900-GI6000 " 0 - 6000 PSIG 4: 24VDC, 4-20mA (4 wire)
3900-VI0050 " Vacuum - 0 - 50 PSIG 5: 24VDC, 2 relay outputs
6: 24VDC, 2 relays, 4-20mA
±0.10% FS Models 7: 24VDC, 1-5 VDC (4 wire) output
3910-Same pressure ranges and options as 3900 8: 24VDC, 2 relays, 1-5 VDC
ZZ= 01: CE Approval
02: CSA/Intrinsically Safe Approval

14

3900 /3910 Digital Pressure Gauge

Specifications

• ACCURACY: • ENCLOSURE: NEMA 4, 304 stainless steel
3900: ± 0.25% of Full Scale at calibrated temperature.
3910: ± 0.10% of Full Scale at calibrated temper- • MEDIA COMPATIBILITY:
ature. Temperature Effect: All units compensated to Isolated sensor for processes compatible with 316SS
± 0.01% of F.S. per ˚C.
• PROCESS CONNECTION: 1⁄4" male NPT, 316SS
• DISPLAY: 4 1⁄2 digit LCD (0.6" high), 0 - 100%
vertical bar graph, Unit Indication, Low battery • OVER-PRESSURE LIMITS:
indicator. Twice the full scale range

• POWER: • WEIGHT: 25 ounces.
Options: •Two 9 volt alkaline batteries (included).
• Lithium batteries for use below 32ºF (0ºC) • TEMPERATURE:
• 24VDC or 110 VAC with optional adaptor. Storage: -40º F to 158º F (-40º C to 70º C)
Operating: 32º F to 140º F (0º C to 60º C)

Standard Features

• SELECTION OF ENGINEERING UNITS: • MIN/MAX: Capture and display pressure extremes.

PSIG, Ft. H2O, In. H2O (60º F, 20º C, 4º C), In.

Hg, Bar, mm Hg, kPa, & user selectable units • DAMPING: Provides a stable pressure indication

by averaging pressure measurements. Selectable

• FIELD RECALIBRATION: from off to 50 seconds.

Recalibration can be done at any time using an

accurate standard pressure reference. • BARLo & BARHi: A user scalable Bar Graph for

visual indication of any pressure range. Default is

• SHUTOFF TIMER: (available on battery powered 0 to100% of full scale range.

units) Selectable from off to 50 minutes.

Options

• 24 VDC POWERED UNITS: • SPDT RELAY OUTPUTS:
External powered units for extended gauge Provides two adjustable SPDT relays that
operation and for gauges with output options. can be integrated in a control circuit to activate an
Compliance voltage: 17 VDC to 30 VDC. external device such as a warning light, valve,
solenoid, etc... Adjustable throughout the gauge
• Intrinsically Safe (CSA) and CE APPROVAL: full scale pressure range with adjustable deadband.
Intrinsically Safe/CSA approval for use in Class 1, Relay contacts are rated for 0.5 Amp @120 VAC
Division 1, Groups A,B,C,D environments (battery and 1 Amp resistive @ 30 VDC.
units only, others pending). CE approval for use in
the European markets. • PANEL MOUNTING: Provides integral panel
mounting bracket with rear pressure connection.
• 4 to 20 mA or 1-5 VDC OUTPUT:
Provides remote pressure monitoring. Fully • DIAPHRAGM SEALS: Various sizes and styles of
adjustable throughout the gauge full scale range. diaphragm seals including threaded, flanged and
Two wire configuration with a 6 foot pigtail and sanitary provide gauge to process isolation.
four wire configuration available for 4-20 mA. Sanitary diaphragm seals are available for food
Four wire configuration for 1-5 VDC. and pharmaceutical applications.

PIPE MOUNT Dimensions PANEL MOUNT

15

Manometer

Meriam Manometers have many advantages in this age of technology
because of their inherent accuracy and simplicity. Manometers are unique in
being both pressure measurement instruments and standards for calibration of
other instruments. Once considered solely a laboratory instrument, the
manometer is today commonly used in production applications to measure
pressures ranging from as high as 100 inches of mercury to the lowest vacuums
of space.

U-Tube Manometer
The U-tube manometer is the basic and most widely used style of manometer.

The Meriam U-tube manometer is a versatile, economical instrument for the
measurement of pressures, vacuums or differential pressures.

Pressure measurements are accomplished by balancing a vertical head of
indicating fluid with the pressure to be measured. There are no cams, gears,
or levers to operate in the manometer. This allows the U-tube manometer to be
recognized by NIST as a primary standard due to its inherent accuracy and
simplicity of operation.

Meriam U-tube manometers are constructed of a ridged cast aluminum frame,
aluminum indicating scale and hand bent glass U-tube. Mounting holes are
provided in the frame for mounting to a wall, column or other suitable structure.

Well Type Manometer
Well manometers are a direct reading device

designed for process monitoring, general purpose
production testing or laboratory measurement. Designed
for a maximum line pressure of 250 PSI (500 PSI optional) these instruments
may also be used for tank level, flow measurement and leak detection. Well
manometers are constructed of aluminum channel, stainless steel end
blocks and stainless steel manometer well. The 7/16" diameter glass tubing
is yoke packed with viton gaskets at each end block and is supported at
spaced intervals to prevent distortion.
In most cases, the uncertainty of a manometer reading is + 1/2 of the
smallest scale graduation. This is due to the human eye’s ability to
interpolate between graduations

Inclined Manometer
Inclined manometers provide greater readability by stretching a

vertical differential along an inclined indicating column, giving more
graduations per unit of vertical height. This effectively increases the
instrument’s sensitivity and accuracy. Scales are typically graduated
to the hundredth of an inch.

The Model 40HEX Inclined manometer is individually calibrated
and the angle of inclination is set relative to the instrument level
mounted above the channel. The unit is also capable of operating
with 350-PSI line pressure. The construction of the 40HEX35 is similar
to the well type manometer described above.

Additional inclined manometers are available depending on your
requirements. Please review the manometer chart on the facing page or
contact the factory for assistance.

22

Meriam Manometers

Quick Selection Chart

Manometers: “U” Tubes & Well Types & Inclines

MODEL RANGES WETTED PRESSURE MOUNTING
PARTS RATING STYLES
"U" TUBE (In Inches) Cast Iron 250 PSIG Wall
10AA25 6, 10, 15, 20, 100 PSIG Table
316 SS PVC Wall
"U" TUBE Hg 30, 50" Cast Iron 400 PSIG Table
FILLED 5, 10, 19, 29, 316 SS 250 PSIG
303 SS 500 PSIG Wall
ABSOLUTE 50" 303 SS 250 PSIG Table
11AA10 100 PSIG
10,20,30,40, 303 SS Wall, Table
HI PRESSURE 60, 80, 100" 303 SS 350 PSIG Flush Front
"U" TUBE 20 PSIG
20DAX40 6, 12, 20, 30, 303 SS Pipe
35, 40, 50, 60, Stainless Steel
GENERAL Wall, Table
PURPOSE 80, 100" Acrylic Flush Front
30EBX25
30EBX50 20, 30, 40, 50, Stainless Steel Pipe
60" Wall, Table
PRECISION Aluminum Flush Front
VERNIER 6, 12, 20, 30,
30EFX25 35, 40, 50, 60, Wall, Table
Flush Front
Hg FILLED 80, 100"
ABSOLUTE Table
310ECX10 12, 20, 30, 40,
310EFX10 50, 60, 80, 100" 100 PSIG Wall
350 PSIG Table
MULTIPLE 10, 20"
TUBE Wall
1, 2, 3, 6"
33KBX35 25, 50, 75, 150mm 100 PSIG Wall

MICRO 2, 4, 6, 8, 10,
PRECISION 12, 14, 16, 18,

34FB2TM 20"
34MB2TM
1/2, 1, 1-1/2,
ACRYLIC 2, 3, 4
INCLINED

40AM10
40AX10

GENERAL
PURPOSE
INCLINED
40HEX35

DRAFT
GAUGE
INCLINED
40GD10

*CONSULT FACTORY FOR OTHER AVAILABLE MODELS AND FLUIDS

23

Laminar Flow Element

Laminar Flow Element

Meriam Laminar Flow Elements are
gas volume rate of flow differential
producers operating on capillary flow
principles. They are available in a wide
range of types and sizes and are ideally
suited to many flow measurement and
calibration applications.

Some typical applications of Meriam LFE Elements
include: combustion airflow to internal combustion engines, fan
and blower calibration, leak testing, and testing of automobile components.
LFE’s are used to calibrate other flow metering devices such as variable area meter,
thermal anemometers, orifices, nozzles, etc. Contact us for application assistance.

Calibration and Accuracy

Meriam LFE elements are calibrated with air at atmospheric conditions, and referenced to 29.92" mercury absolute
(760MM HG Abs.) and 70˚F. (21.1˚C). Each completed element is calibrated and correlated to Meriam flow standards,
which are traceable to the National Institute of Standards and Technology. The Meriam LFE element is supplied with
a reproducible flow curve in terms of SCFM versus differential pressure in inches of water. Correction factors are
included to cover an inlet pressure range from 26 to 36 inches of mercury absolute and an inlet temperature from
50˚F to 150˚F. For special flow applications, we request you contact Meriam, giving complete flow information. The
rated accuracy* of all Meriam LFE elements is of actual reading and is not the much wider tolerance of other devices
which are based on percentage of maximum flow rate.

*Accuracy Levels Available: +0.86% of Actual Reading
Commercial Calibration +0.70% of Actual Reading
Master Calibration +0.50% of Actual Reading
Independent Lab Calibration

Special calibration procedure service is available for those Meriam LFE units, which are governed by quality programs
requiring periodic recalibration. The Special Calibration Procedure #A-33544 is designed to meet the basic require-
ments of MIL-STD-45662A, ANSI Z540, 10CFR50 and MIL-Q-9858A. Contact Meriam direct for information.

Meriam LFE Elements are normally rated for maximum flow at 4 or 8 inches of water differential. There is no recovery
of pressure differential in a Laminar Flow Element matrix. Filters, inlet and outlet configurations increase the total
pressure drop and must be considered when pressure loss considerations are critical.

GAS PROPERTIES AT STANDARD CONDITIONS OF 29.92" Hg. Abs. and 70˚F

Gas Density (lb/ft3) µViscosity Micropoises Specific Gravity
Air 0.0749 181.87 1.000
Argon 0.1034 222.45 1.380
Helium 0.0103 196.90 0.138
Hydrogen 0.0052 0.0695
Nitrogen 0.0725 88.41 0.968
Oxygen 0.0828 175.72 1.105
Carbon Dioxide 0.1143 201.91 1.526
147.84

NOTE: Ref. American Institute of Chemical Engineers

24

Meriam LFE Quick Selection Chart

MODEL NUMBER & DESCRIPTION MODEL NOMINAL AIR FLOW RANGE
STANDARD CUBIC FEET/MINUTE
Model 50MK10
(29.92" Hg. Abs. & 70˚F) (SCFM)

Pipe Size

Utilizes stainless steel 1/4" 50MK10-8 .00019 SCFM @ 4" water diff.
capillary tubes cemented 1/4" 50MK10-7 .00062 " "" " "
into a stainless steel body. 1/4" 50MK10-6 .00124 " "" " "
Inlet, outlet, and differential 1/4" 50MK10-5 .0025 " "" " "
pressure connections are 1/4" 50MK10-4 .0046 " "" " "
1/4" NPT. 1/4" 50MK10-3 .0081 " "" " "
1/4" 50MK10-2 .0149 " "" " "
All stainless steel unit with 1/4" 50MK10-1 .046 " "" " "
fused matrix. Differential
Model 50MJ10 pressure connections are 1/4" 1/2" 50MJ10-14 0.10 SCFM @ 8" water diff.
Model 50MW20 NPT. Line connections 1/2" 1/2" 50MJ10-13 0.18 " "" " "
Model 50MH10 NPT, except Type 9 which has 1/2" 50MJ10-12 0.38 " "" " "
a 3/4" NPT. 1/2" 50MJ10-11 0.70 " "" " "
1/2" 50MJ10-10 1.60 " "" " "
All stainless steel welded unit 3/4" 50MJ10-9 3.00 " "" " "
with fused matrix. Line con-
nections are threaded. 1" 50MW20-1 7.5 SCFM @ 8" water diff.
Differential pressure connec- 1 1/2"" 50MW20-1 1/2 22.0 " "" " "
tions are 1/4" NPT. 50MW20-2 40.0 " "" " "
2"

All stainless steel unit with 1" 50MH10-1 7.5 SCFM @ 8" water diff.
fused matrix. Line connec- 1 1/4" 50MH10-1 1/4 16.0 " "" " "
tions are plain ends (no 1 1/2" 50MH10-1 1/2 23.0 " "" " "
threads) for hose connection. 50MH10-2 40.0 " "" " "
Differential pressure connec- 2" 50MH10-3 90.0 " "" " "
tions are 1/4" NPT. 3" 50MH10-4 160.0 " "" " "
4" 50MH10-5 250.0 " "" " "
5" 50MH10-6 360.0 " "" " "
6" 50MH10-8 X 640.0 " "" " "
8" 50MH10-10 X 1000.0 " "" " "
10" 50MH10-12 X 1440.0 " "" " "
12" 50MH10-16 X 2250.0 " "" " "
16"

Model 50MY15

All stainless steel unit with 2 1/2" 50MY15-2 1/2 60.0 SCFM @ 8" water diff.
fused matrix. Differential pres- 3" 50MY15-3 90.0 " "" " "
sure connections are 1/4" NPT. 4" 50MY15-4 160.0 " "" " "
Line connections are 150 lb. 5" 50MY15-5 250.0 " "" " "
flanges. 6" 50MY15-6 360.0 " "" " "
8" 50MY15-8 X 640.0 " "" " "
10" 50MY15-10 X 1000.0 " "" " "
12" 50MY15-12 X 1440.0 " "" " "
16" 50MY15-16 X 2250.0 " "" " "

Model 50MR2 This unit is for low pressure 2" 50MR2-2 100.0 SCFM @ 8" water diff.
Model 50MC2 applications. Differential pres- 4" 50MR2-4 400.0 " "" " "
sure connections are 1/4" NPT. 6" 50MR2-6 1000.0 " "" " "
Aluminim 150 lb. flanges are 8" 50MR2-8 2250.0 " "" " "
furnished at inlet and outlet
FOR HOSE 50MC2-2 100.0 SCFM @ 8" water diff.
This unit is for low pressure 2" I.D. 50MC2-4 400.0 " "" " "
applications. Differential pres- 4" I.D. 50MC2-6 1000.0 " "" " "
sure connections are 1/4" NPT. 6" I.D. 50MC2-8 2250.0 " "" " "
Designed for use with hose for 8" I.D.
line connections at inlet and
outlet

26

NOMINAL AIR FLOW RANGE
(760 MM Hg. Abs. & 21.1˚C)

CC/MIN LPM Kg/M MAX DP MM H20

5.38 0.00538 6.44 x 10-6 101.6 Accuracy levels available:
17.5 0.0175 2.10 x 10-5 101.6 commercial calibration ± 0.86%
35.1 0.0351 4.21 x 10-5 101.6 reading: master calibration ± 0.70%
70.8 0.0708 8.48 x 10-5 101.6 reading: independent lab
130 0.130 1.56 x 10-4 101.6 calibration ± 0.5% reading.
229 0.229 2.75 x 10-4 101.6
422 0.422 5.06 x 10-4 101.6 Units available to measure
1300 1.30 101.6 15,000 SCFM.
0.00156
All units available with filters
2830 2.83 0.00339 203.2 except those marked with X.
5100 5.10 0.0061 203.2
10700 10.8 0.0129 203.2 For pressures greater than 30
19800 19.8 0.0237 203.2 PSIG or 120˚ F, Meriam
45300 45.3 0.0543 203.2 Instrument recommends the
85000 85.0 0.102 203.2 Universal Calibration Curve
Method for calculating flow rate
2.12 x 10 5 212 0.254 203.2 through an LFE. This method
6.23 x 10 5 623 0.746 203.2 incorporates density corrections
1.13 x 10 6 1130 1.357 203.2 instead of the ideal gas law correc-
tions common to the Classical LFE
2.12 x 10 5 212 0.254 203.2 equations. While the Classical
4.53 x 10 5 453 0.543 203.2 equations are excellent at condi-
6.51 x 10 5 651 0.780 203.2 tions below 30 PSIG or 120˚ F, the
1.13 x 10 6 1130 1.35 203.2 Universal Calibration Method
2.55 x 10 6 2550 3.05 203.2 provides more accurate results
4.53 x 10 6 4530 5.43 203.2 above these values. Consult
7.08 x 10 6 7080 8.48 203.2 Meriam for your higher pressure
1.02 x 10 7 10200 12.2 203.2 or temperature applications and
1.81 x 10 7 18100 21.7 203.2 for sizing assistance.
2.83 x 10 7 28300 33.9 203.2
4.07 x 10 7 40800 48.8 203.2 NOTES
6.37 x 10.7 63700 76.3 203.2 1. The flows and differential pressure rating of production units are
subject to a variation of plus or minus 10% from the nominal values
1.69 x 10 6 1700 2.03 203.2 listed above.
2.55 x 10 6 2550 3.05 203.2 2. Each LFE unit is calibrated with air to Meriam flow standards, which
4.53 x 10 6 4530 5.43 203.2 are traceable to the National Institute of Standards and Technology.
7.08 x 10 6 7080 8.48 203.2 Meriam calibration flow curves are furnished with each unit.
1.01 x 10 7 10200 12.2 203.2 3. A special service is available for those Meriam LFE units, which
1.81 x 10 7 18100 21.7 203.2 are governed by quality programs requiring periodic recalibration.
2.83 x 10 7 28300 33.9 203.2 The Special Calibration Procedure A-33544 is designed to meet the
4.07 x 10 7 40800 48.8 203.2 basic requirements of 10CFR50, ANSI-Z540-I & ML-Q-9858A.
6.37 x 10 7 63700 76.6 203.2 Contact Meriam direct for information.
4. The catalog capacities refer to the following base conditions:
2.83 x 10 6 2830 3.39 203.2 Base flowing gas: Air. Base pressure 29.92" mercury absolute.
1.13 x 10 7 11300 13.6 203.2 Base temperature: 70˚F, 530˚R absolute. Base viscosity: 181.87
2.83 x 10 7 28300 33.9 203.2 microproises. Base Reynolds Number: 300 at 8" H2O, 150 at 4" H2O.
6.37 x 10 7 63700 76.3 203.2 5. SCFM* - See page 6 for definition.
6. All units are offered with optional integral filter on inlet side
2.83 x 10 6 2830 3.39 203.2 except those marked (X). Removal or replacement of filter necessi-
1.13 x 10 7 11300 13.6 203.2 ties recalibration.
2.83 x 10 7 28300 33.9 203.2
6.37 x 10 7 63700 76.3 203.2 7. Rated flow pressure and temperature for standard units are 30
psig and 150˚F. to maintain laminar flow, calibration, linearity and
accuracy. For higher pressure and temperature rating call Meriam
Representative or direct to Meriam Instrument.

INSTALLATION

Due to asymmetry of filter elements, calibration accuracy
of assembly cannot be guaranteed if filter is removed for
any reason. If filter is removed, the assembly should be
recalibrated to ensure accurate performance.

27

Meriam’s Accutube Flow Sensors

Meriam’s Accutube Flow Sensors are lab-tested and field-proven flow elements perfect for gas, liquid or steam
service. With thousands in use worldwide, the Accutube continues to be the right choice when ease of installation,
cost effective operation and highly accurate performance is required.

The Accutube averaging Pitot tube is a head type device, which generates a differential pressure signal similar to the
orifice, venturi, flow nozzle, and other head producing primary elements. It can be used for flow measurement only
or with static pressure and temperature transmitters as the primary measurement source for a flow control loop. It
has been proven that the Accutube’s flow measurement accuracy is better than that of the orifice. The Accutube also
generates considerable cost savings with its simple installation and wear-free, energy-efficient design, providing a
viable alternative to traditional flow measurement devices.

Principal of Operation

The Accutube is an annular averaging Pitot device, which is simply inserted into a pipe or duct through a weld
coupling and packing. Based on pipe or duct size, the Accutube is constructed so that strategically located sensing
ports continually sample the impact and static pressures produced by the Accutube’s obstruction of the flow stream
profile. Within the probe, the impact pressures sensed by the upstream ports are continually averaged in an isolated
plenum chamber. Similarly, the static pressures sensed by the downstream ports are averaged in a second isolated
plenum. A readout device is then used to indicate the differential between the two-plenum chambers.

Meriam Accutubes are provided in a wide variety of models enabling you to select the probe diameter and mounting
configuration compatible with your application needs. Meriam also has available special mounting hardware, valves
and materials for use in high temperature and pressure applications and corrosive environments.

For convenience in selecting and sizing Accutubes for your applications, please refer to the data form found on page
25 in this catalog. Complete the form and submit it to the factory for detailed analysis and configuration. For
further assistance on Accutube sizing and selection, feel free to contact Meriam Instrument or your local Meriam
representative. You can request the "Accutube Selection and Sizing Data Sheet" if you need detailed steps on
selection and sizing.

Accutube: Features

Accuracy Convenience

True double averaging design Applicable to gases, liquids, steam
+1% of rate accuracy Simple installation and maintenance
+0.1% repeatability Four standard models and probe sizes: Insertion,
Tested and certified by independent flow labs Flanged, Wet tap with socket or gear drive
retraction, Integral three-valve manifold, optional
Confidence Bi-directional flow sensing

Testing by the Utah Research Laboratory-Utah Efficiency
State University, the University of Michigan
and testing against NIST traceable Meriam Low permanent head loss saves energy and cost
flow elements confirm typical accuracy of Multiple tube design offers superior strength and

±1% of rate clog resistance
Material Certification and Certificate of Unaffected by wear
Conformance per customer specification are No system shutdown with wet tap model
available. Ideal for flow system upgrades and expansions
Certified welding fabrication to ASME Code, Integral 3-Valve head option saves installation
Section IX Procedures. piping and transmitter mounting time.
Dye penetrant and hydrostatic testing capability. Gear Drive wet tap reduces insertion and
Canadian registration number. retraction time

28

Accutube: Low-Cost Flow Measurement

The Accutube reduces initial costs through low purchase price and reduced
installation cost.

The purchase price of an Accutube will almost always be less expensive than other head producing primary ele-
ments. Meriam’s simple and effective Accutube design allows us to pass fabrication savings on to you. When
mounting hardware is considered, the Accutube will always be low in cost. No flanges are required, just the simple
mounting hardware included with the Accutube. Choose the integral 3-valve manifold Accutube head to reduce
your transmitter mounting and piping costs.

The Accutube’s installation costs are also low. On an 8-inch pipe, for example, installation of the Accutube’s mount-
ing thredolet requires only 4 linear inches of welding while orifice flanges for the same size pipe require 50 linear
inches. Orifice flanges also require pipe cutting, weld preparation and weld cleanup. With the Accutube, simply
weld on the thredolet, bore a hole, install the Accutube and tighten the packing gland. You’re ready to go!

Operational savings continue
with low-cost maintenance, wet tap flexibility and low permanent head loss.

The Accutube simplifies preventive maintenance with its clog-resistant and wear - free design. This combination
brings downtime to a minimum and frees you to concentrate on the process itself.
If shutting down your process is too costly, then look to Meriam’s Wet Tap Accutubes. These Accutubes can be
inserted and retracted without process interruption, after being installed without process shutdown. This flexibility
gives you the ability to spot check the process, inspect the Accutube and pig or flush the line without Accutube
damage while eliminating the need for by-pass piping and valve systems. Choose from socket or gear drive retrac-
tion options to meet your needs.

Accutubes save you money by causing less permanent pressure loss. Permanent pressure loss (unrecoverable head
loss) is the system energy lost due to the primary element’s obstruction of the flow stream. This pressure drop is
what your pump or fan has to overcome and is directly related to system operating costs. The Meriam Accutube is
much less of a flow obstruction than other primary elements. Test results on the Accutube show typical unrecover-
able head loss of 2 –10 % of the produced differential pressure. This means that there is much less permanent pres-
sure loss, less work for the pump or fan to do and much lower operating costs. The difference in using Accutubes
versus orifice plates can add up to hundreds of dollars per year in pump or fan horsepower per measurement point.

Accutube: Installation Requirements

Meriam Accutubes perform best when installed in the proper orientation with respect to piping configuration. The
following diagrams and tables show correct installation orientation and straight-run requirements both upstream
and downstream of the Accutube location.

Sensor Orientation

HORIZONTAL LINES
Bottom Entry
Side Entry
Top Entry

VERTICAL LINES
Special 90° Rotated Accutube Head

recommended for liquid and steam use.

29

Accutube: Series 10A and 11A

30

Accutube: Series 20T and 21T

03

31

Accutube: Series 22L and 23L

32

Accutube: Series 24D and 25D

33

Accutube: Series 33T Low Pressure Wet Tap

34

Accutube: Series 37L High Pressure WetTap

BODY MATERIAL ORDER SD Socket
03 Drive
316SS Head and
Probe SP GD Gear
Drive
For Special Material
Consult Factory

35

Accutube: Series 40H thru 43H

36

Accutube: Series 70H & 72H(with RTD)

37