G-Tek Corporation Private Limited
35
7.3.9.1
Sensor
Three types of sensor inputs are being accepted by the LmNet.
7.3.9.1.1
RTD
It is Resistance Temperature Sensor. The sensor name is PT100.
A platinum resistance temperature detector (RTD) is a device with a typical resistance of 100 Ω at 0°C.
It consists of a thin film of platinum on a plastic film. Its resistance varies with temperature and it can
typically measure temperatures up to 750 °C. The relationship between resistance and temperature
is relatively linear as shown below for a sample 100 Ω RTD.
Figure 37 RTD Sensor
7.3.9.1.2
Thermocouple
There are total 9 types of thermocouple inputs the LmNet accepts as listed under.
❖
TC-J
It is made up of iron (+ve electrode) & constantan (-ve electrode).
It operates over the temperature range of (-200) to (1200) °C temperature.
Its sensitivity is 50 uV/°C.
❖
TC-K
It is made up of chromel (+ve electrode) & alumel (-ve electrode).
It operates over the temperature range of (-200) to (1372) °C temperature.
Its sensitivity is 41 uV/°C.
❖
TC-C
It is made up of tungsten (+ve electrode) & rhenium (-ve electrode).
It operates over the temperature range of (0) to (2300) °C temperature.
Its sensitivity is 46 uV/°C.
❖
TC-R
It is made up of plutonium (+ve electrode) & rhodium (-ve electrode).
It operates over the temperature range of (0) to (1750) °C temperature.
Its sensitivity is 36 uV/°C.
+
+
-
