PRODUCT CATALOGUE TEMPERATURES HEATERS PRESSURES SCHEDULE MEASURE CALIBRATION WR&W ENGINEERING CO.,LTD 599/5 Moo 2, Setthakit 1 Rd., Omnoi, Krathumbaen, Samutsakhon 74130 Tel. 02 808 5422-26 Fax. 02 808 5427-28 Website : www.wrw.co.th Email Center : [email protected]
CUSTOMER ARE OUR PRIORITY ยิ้มแย้มแจ่มใส ประทับใจบริการ คุณภาพมาตรฐาน คืองานของเรา Company Profile For 15 years, WR&W Engineering Company Limited has distributed the products and services to Industrial Companies all of religions in Thailand. We have been supported and intrusted by customers. Therefore, we are absolutely delighted to be a part of development for potential productions and Modern technologies. WR&W Engineering was established in 1999. We have been developing the product qualities and services accordance to industrial sector that updated all the time. WR&W Engineering is manufacturer and distributor of Temperature Sensor Thermocouple and RTDs equipment including to calibrations. Form the beginning to the future, we have been emphasizing to develop the product qualities and services for satisfaction of the customer and reduction of imported goods. Moreover, we will submit the goods to the customer on time by the confidence. We promise that we will ever offer the best after-sales service and quality product. We have an expert who gives a precise advisement for applying of customer requirements.
(1) Contents Temperatures Introduction of Thermocouples & RTDs..................................................................... Ordering from Thermocouples & RTDs....................................................................... Thermowells........................................................................................................................ Ordering from Thermowells............................................................................................ Flanges................................................................................................................................... Pipe Schedules..................................................................................................................... Thermocouple Heads........................................................................................................ Terminal Blocks.................................................................................................................... Standard & Miniature Connectors................................................................................ Protection Tubes.................................................................................................................. Inner Ceramics..................................................................................................................... Thermocouple Extension & Compensating Wires................................................... Thermocouple Probes....................................................................................................... Temperature Transmitters................................................................................................ Temperature Controllers.................................................................................................. Digital Indicators................................................................................................................. Hybrid Recorder................................................................................................................... Digital Thermometers....................................................................................................... Infrared Thermometers..................................................................................................... Digital Thermo - Hygrometers........................................................................................ Humidity / Temperature Transmitters.......................................................................... Industrial Thermometer.................................................................................................... Heaters Introduction of Heaters.................................................................................................... Ordering from Heaters...................................................................................................... Wire Heaters.......................................................................................................................... Ceramic Fiber........................................................................................................................ Thyristor Power Regulator (SCR)................................................................................... Mini Power Regulator (SCR)............................................................................................. Solid State Relay (SSR)....................................................................................................... Pressures Pressure Gauge.................................................................................................................... Pressure Electric................................................................................................................... Transmitter Pressure Gauge............................................................................................ Pressure Gauge Diaphragm............................................................................................ Differential Pressure Gauge............................................................................................ Homogenizer Pressure Gauge Diaphragm................................................................ Industrial Pressure.............................................................................................................. Pressure Gauge Type......................................................................................................... 1-11 12-20 21 22-23 24 25 26-30 31-32 33-38 39-41 42-44 45-55 56-57 58-70 71-76 77-78 79-80 81-87 88-89 90-93 94-97 98-102 104 105-112 113-116 117 118-122 123 124-126 128-130 131 132 133 134 135 136-139 140-141
(2) Calibration Calibration and Std.Instrument...................................................................................... Calibration Service............................................................................................................. Multicalibrator...................................................................................................................... Super Thermometer........................................................................................................... Dry Block................................................................................................................................ Pressure Calibrator.............................................................................................................. Schedule Measure Table for Thermocouple.................................................................................................... Table for RTD......................................................................................................................... Tolerances for Class............................................................................................................. Emissivity Temperature..................................................................................................... Thread and Cannection.................................................................................................... Protection Tubes.................................................................................................................. Wire Gauges........................................................................................................................... Tolerances Standard Weight............................................................................................ 142 143 144 145 146 147 149-150 151-153 154 155 156-157 158-159 160-163 164
TEMPERATURES 2 Thermocouples Theory Thermocouple Practice Connection Of Thermocouple To Measuring Instruments T.J. Seeback in 1821 observed that a small electric current flows in a closed circuit of two dissimilar metals if one of the functions is hested with respect to the other. Reversing the heating polarity produces an opposite direction of current flow. The magnitude of the voltage generated, called the thermal electromotive force (e.m.f.) is a function of temperature difference of the two junctions. Although many combinations of metals and alloys display thermocouple behaviour, in practice only a small number meet the general requirements of industrial and laboratory applications. The small thermal e.m.f. (thermocouple singnal) produced must be of sufficient magnitude, linearity and repeatability for use by conventional instrumentation as a measured quantity. For practical purposes, thermocouples are divided into two categories: rare metal types, (usually platinum V A thermocouple does not measure the temperature at the ‘hot’ (measuring) junction but is a diffirential measurement bitween the ‘hot’ junction and the ‘cold’ (reference) junction. For accurate temperature measurement, the reference junction must be held at a fixed, known temperature; alternatively, accurate compensation must be made for any temperature variations of the reference junction In the majority of industrial applications, instruments configured fo r thermocouple inputs incorporate some form of automatic cold junction compensation (C.J.C.) The temperature of the input termination is sensed and a corrective signal is applied to the measuring circuit of the instrument. To determine the temperature of the ‘hot’ juntion we must know:- i) the calibration data for the thermocouple ii) the measured output voltage iii) the temperature of the reference (cold junction) Ordinary copper wires should never be used, as the error will be equal to the difference in temperature between the connecting point of the thermocouple and the instrument (or external reference junctions) Extension or compensating wire or cable must be employed, and it is essential that the same polarity. is maintained. If the polarity is reversed, the error is equal to twice the temperature difference bitween the connecting point of the thermocouple and the instrument (or external reference junction). Platinum Rhodium) and base metal types such as Nickel Chromium V Nickel Aluminium and lron V Copper Nickel (Constantan). Measuring junctions are formed by a spot weld of the two dissimilar wires usually located inside a protecting sheath.
Continuous Working Time For Thermocouple TEMPERATURES 3
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TEMPERATURES 5 Thermocouple mounting
TEMPERATURES 6 Description Mineral insulated thermocouple consists of two dissimilar thermocouple wires that are insulated using highly compressed ceramic powder and encased in a metallic sheath. Due to its inherent features such as flexibility MI thermocouple cable can be used in a wide variety of otherwise difficult temperature measuring applicationss. Compared with the conventional thermocouples, MI thermocouple have many advantages. Basic Thermocouple Theory l A thermocouple is a closed loop circuit that consists of two dissimilar metal wires welded togerher at both ends. l When a temperature difference exists between the twe junctions, an electromotive force (thermal emf) develops and a thermoelectric current flows in the circuit. l The emf and its polarity depends on the temperature difference and the combinations of the two metal wires, and are not affected by the size or length of the wires. l When the relationship between the temperature difference and the thermal emf induced within is know beforehand for a particular thermocoule, temperature can be measured Mineral Insulated Thermocouple Cable FEATURES l Long life span l Quick response l Simple installation l Custom long lengths l Excellent mechanical strength l Corrosture / pressure / radiation resistant l Moisture / pressure / radiation resistant l Wide measuring range with a choice of insulation and sheath material l Standard sheath sizes ranging from 0.25 mm OD to 8.0 mm OD.
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TEMPERATURES 9 Resistance Temperature Detectors (RTDs)
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TEMPERATURES 12 Ordering From Thermocouple & RTDs
TEMPERATURES 13 Ordering From Thermocouple & RTDs
TEMPERATURES 14 Ordering From Thermocouple & RTDs
TEMPERATURES 15 Ordering From Thermocouple & RTDs
TEMPERATURES 16 Ordering From Thermocouple & RTDs
TEMPERATURES 17 Ordering From Thermocouple & RTDs
TEMPERATURES 18 Ordering From Thermocouple & RTDs
TEMPERATURES 19 Ordering From Thermocouple & RTDs
TEMPERATURES 20 Ordering From Thermocouple & RTDs
TEMPERATURES 22 Ordering From Thermowells
TEMPERATURES 23 Ordering From Thermowells
TEMPERATURES 24 Flanges
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TEMPERATURES 40 Ceramic Protection Sheaths
TEMPERATURES 41 Physical Materials Properties
TEMPERATURES 42 Possible Designs For Insulators and Protection Sheaths
TEMPERATURES 43 Inner Ceramic
TEMPERATURES 44 Inner Ceramic
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