AI835A ABB System 800xA hardware selector

Features and benefits

• 8 differential input channels for thermocouple/mV.

• Channel 8 can be designated as the CJ-channel (4-wire Pt100 RTD)

• Variety of thermocouples with the folowing characteristics: B, C, E, J, K, N, R, S and T for AI835A also D,

L and U

• 15 Bit resolution (A/D)

• Inputs are monitored for wire-break open-circuit

The AI835/AI835A provides 8 differential input channels for

Thermocouple/mV measurements. Measurement ranges configurable

per channel are: -30 mV to +75 mV linear, or TC Types B, C, E, J, K, N, R,

S and T, for AI835A also D, L and U.

One of the channels (Channel 8) may be configured for “Cold

Junction” (ambient) temperature measurements, thus serving as CJ

channel for Ch. 1 .7. The junction temperature may be measured

loca ly on the MTUs screw terminals, or on a connection unit distant

form the device.

Alternatively, a fix junction temperature for the module may be set by

the user (as parameter) or for AI835A also from the application.

Channel 8 may be used in the same manner as Ch. 1 .7 when no CJ

temperature measurement is needed.