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Input for thermocouple modules 750-462,469
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2
Technical Data:
Item Number 750-462, 469
Number of inputs 2 (differential input, max. +/- 3.5V)
Voltage supply via system voltage
Sensor types J, K, B, E, N, R, S, T, U, L, mV Messung
Cold junction compensation on each module
Measuring accuracy <25 µV, typ. 15 µV
Resolution0.1°C per Bit
Isolation DC/DC 500V system / power supply
Input current (internal) 65 mA max.
Bit width per channel 16 Bit: data; 8 Bit: control/status*
(detection of broken wire 750-469)
Configuration none, optional via software parameter
Operating temperature 0°C....+55°C
Connection technique CAGE CLAMP; 0.08 to 2.5mm
2
Dimensions (mm)WxHxL 12 x 64* x 100 (*from upper edge of the carrier rail)
Presetting -100°C / +1370°C, Typ K
The function module 750-462 permits the direct connection of thermocouple sensors.
The module is suitable for 2 or 3-wire thermocouples. For the 2-wire connection
technique, connect the thermocouple wires between TC- and TC+ . For the 3-conductor
technique the shield is also connected. The operation of grounded sensors is provided by
means of internal electrical isolation.
The function module 750-469 alos detects a broken wire. You can find the PNs for the
different sensor types for 750-462 in the following table.
Warning: Both inputs are referenced to a common potential (not isolated)!
The linearization is provided over the complete range by a microprocessor. The
temperature ranges of the sensors are represented with a resolution of 1 bit per 0.1°C in
one word (16 Bit). Thus, 0°C corresponds to the value 0000, and 25.5°C correspond to
the value 0 x 00FF. Temperatures below 0°C are represented in two’s complement with
a leading ‘1’.
Within the whole range of all thermocouples, the function module works like a ‘µV
meter’. The voltage resolution is represented with 16 bits. A processor converts the
voltage value into a numerical value proportional to the measured temperature of the
selected type of thermocouple.
In order to compensate the offset voltage at the clamping point, a cold junction
thermocouple compensation calculation is carried out. The circuit contains a
temperature measuring sensor at the ‘CAGE CLAMP’ connection and considers the
temperature offset voltage when calculating the measured value.