AI2 analogue input - 2 channel
This analogue input module is used to monitor analogue signals from a wide range of plant sensors, The mA and TC inputs each require the appropriate Thermal Unit. The second channel of the A12 has a special high impedance range for use with the zirconia probe inputs.
　

No of channels: 2
Input types: TC, RTD, Volts, mA, mV, Potentiometer, Pyrometer, Zirconia probe
mV range: -150mV to +150mV at input impedance >100MΩ
mA range: -22mA to +22mA with 5Ω burden in the terminal unit
Volts range: -10.2V to +10.2V at input impedance 303kΩ
RTD support: Support for 2, 3 and 4 wire resistance thermometer devices
Ohms range: 0 to 600Ω 3- or 4-wire lead compensation
Hi Ohms range: 0 to 5kΩ 3- or 4-wire lead compensation
Pot range: 5% to 95% ‘rotation’ of 100Ω to 5kΩ pot

AI3 analogue input - 3 channel
Provides three isolated current input channels specifically designed to meet the requirements of modern two wire transmitters. Each channel has its own isolated 24V supply for 3-wire transmitter excitation. Each channel is protected against short circuit (with 24V dc supply on) and utilises a sophisticated trip and try system where the module senses over current and cuts the power, after a period the circuit checks for continued circuit malfunction. The module can be optionally fitted with disconnects to allow isolation of an individual input to allow work on the loop to continue safely.
　

No of channels: 3

Input range: -28mA to +28mA

AI4 analogue input - 4 channel
This analogue input module is used to monitor analogue signals from a wide range of plant sensors. The mA and TC inputs each require the appropriate Terminal Unit.
　

No of channels: 4
Input types: TC, mV, mA, Pyrometer
mV range: -150 - +150mV at input impedance >100MΩ
mA range: -22 - +22mA with 5Ω burden in the terminal unit