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

No of channels: 2
Input types: TC, RTD, Volts, mA, mV, Potentiometer, Pyrometer, Zirconia probe
mV range: -150mV to +150mV at b impedance >100MΩ
mA range: -22mA to +22mA with 5Ω burden in the terminal unit
Volts range: -10.2V to +10.2V at b 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 b - 3 channel
Provides three isolated current b 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 b to allow work on the loop to continue safely.
　

No of channels: 3

Input range: -28mA to +28mA

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

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