Micromod MOD: 30ML Installation - Manual (Page 60)

MOD 30ML Multiloop Controller
MODULAR I/O CONNECTIONS
4.3.1 2013A Thermocouple Input (TIM) and Cold Junction Compensation
Make thermocouple sensor connections as shown in Figure 4-2. The controller has
automatic cold junction compensation which must be enabled by connection of a
thermocouple to built-in input 1. When enabled, the automatic cold junction compensation
provides compensation for both built-in and modular inputs, and use of a cold junction
compensation module is not required. For any application requiring one or more
thermocouple inputs, it is recommended that the first thermocouple be connected to built-in
input 1 so that a cold junction module is not required.
In the event that a thermocouple cannot be connected to input 1, installation of a 2-wire RTD
module with a CJC sensor is required for cold junction compensation. This module senses
the temperature at the terminal block and provides cold junction compensation for all
thermocouples connected to the controller.
The RTD sensor used for cold junction compensation is a platinum 1000 ohm RTD with an
alpha of 0.00385. The sensor is Class B (0.12%) and has an operating temperature range of
–50°C to +650°C (–58°F to +1202°F). It is connected to a 2-wire RTD input module and
installed in the housing.
Thermocouple input specifications are:
THERMOCOUPLE INPUT (with upscale burnout detection)
Types: B,E,J,K,N,R,S,T
Range: ±100 mV DC (See Table 4-1 for temperature range limits )
Low limit: - 110 mV
Upper limit: + 110 mV
Input Resistance: 10 Megohms
Noise filter: 3 db at 3 Hz
Resolution: 16 bits
Sensitivity: 4 uV
Accuracy (calibrated): ±0.1% of span
Isolation : 250 Vrms
Max Survivable Input: ±300 VDC or 250 VAC (Differential)
Common mode rejection: 100 db at 60 Hz typical
Normal mode rejection: 40 db at 60 Hz typical
RTD MODULE for COLD JUNCTION COMPENSATION (not required when automatic
compensation is enabled)
Operating range: 0 to 50°C
Overrange: -20 to 70°C
Noise filter: 3 db at 4 Hz
Resolution: 16 bits
Sensitivity: 0.002°C
Accuracy: ±0.5°C
Isolation : 250 Vrms
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