ABB AI835 3BSE008520R1 Analog Input

ABB AI835 3BSE008520R1 Analog Input

The AI835/AI835A Thermocouple/mV Input Module is part of the S800 I/O. It 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 CJchannel for Ch. 1...7. The junction temperature may be measured locally 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.

Each input-channel can measure a mV type of signal source (Thermocouple or linear), and may be grounded or ungrounded.

Full self-calibration is obtained by means of 0V, 50 mV and 100 ohm references, which are regularly updated.

Six different types of MTUs can be used. The TU830 (or TU833) Extended MTU or the TU810 (or TU814) Compact MTU enables three wire connection to the devices without additional terminals. The TU812 Compact MTU has a D-Sub 25 pin (male) connector for connection to the process. TU818 Compact MTU provides connection to 2-wire transmitters without external marshaling.

Shielded field cables are required for process connections.

•8 differential input channels for thermocouple/mV.

•Channel 8 can be designated as the CJchannel (4-wire Pt100 RTD).

•Variety of thermocouples with the following

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 opencircuit.