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3.Can be widely supplied as customer's demands
Resistance temperature detector (RTD)
The Resistance Temperature Detector(RTD) is a sensor, which operates on the principle that the resistance increases with an increase in temperature at a specific rate. Commonly manufactured using a platinum resistance element. It is more accurate and more linear than thermocouples and generally slower responding. It is usually measure the temperature range of -200~600°C, connected with display instrument, recording meter and computer, etc. to directly measure temperature of liquid, gas, solid surface.
Features:
Small external diameter, quick heat responsive period, may be bent, long use life, fine air-tightness, wide thermometric scope, high voltage resistant, anti-vibration, narrow mounting pipeline, may be used under bending conditions.
Working principle:
RTD measure temperature according to the characteristic of metal wire changes electrical resistance along with temperature, the thermoelement of RTD is made by metal wire be wound on the surface of insulation skeleton. If there is temperature gradient in the measured medium, the measured temperature is an average temperature of element in the range of the medium zone.
Temperature measuring range and Tolerances
Calibration | Nominal resistance(0°C) Ω | Temperature measuring range °C | tolerance | R100/ Ro w |
Pt10 | 10 | ceramic elements:-200 ~ 600 mica elements: -200 ~ 420 | ClassA: ±(0.15+0.2%|t|) ClassB: ±(0.3+0.2%|t|) | 1.3851 |
Pt100 | 100 | |||
Cu50 | 50 | -50 ~ 100 | ±(0.3+0.6%|t|) | 1.4280 |
Cu100 | 100 |
Note: The Tolerances of other calibration may consult the above RTD tolerances scope.
thermal response time
Diameter of protective(mm) | Material of protective | Thermal response time(s) | |
Platinum resistance | 12 | Carbon steel:20 Stainless steel:0Cr18Ni12Mo2Ti;1Cr18Ni9Ti | 30~90 |
16 | |||
Taper protective tube | Stainless steel :1Cr18Ni9Ti | 90~180 | |
Copper resistance | 16 | Brass:H62 Carbon steel:20 Stainless steel:1Cr18Ni9Ti | <180 |
Diameter of protective tube(mm) | Length L |
12 | 225,250,350,400,450,550,650,900,1150 |
16 | 300,350,450,500,650,900,1150,1650,2150 |
Taper protective tube | 225,250,300,400 |