Product features
• Thermoelement type J, K, L
(TM 220/A, TM 240/A)
• For PT100 sensors
(TM 225/A)
• Internal and external cold junction compensation
• High measurement precision
• Sensor failure detection
• Electronic parameter chip
Short description
The TM 2xx/A series consists of temperature measurement modules that can be directly attached to CPU modules and
operated with all product lines of the KEBA control system by means of bus couplers.
TM 220/A, TM 240/A
Analog input modules TM 220/A and TM 240/A enable the direct connection of thermoelements (2-conductor tech
nique). The calibration and linearization of the temperature values takes place via a microcontroller. A sensor failure,
should it occur, is reported to the higher-level central module and can be evaluated in the application.
Two operating modes are supported:
• Display of the actually measured temperature (standard mode)
• Display of the measured voltage in μV
Cold junction compensation can occur via internal temperature measurement at the terminals of the module or optionally
with the aid of external sensor TE 220/A (external terminal temperature compensation).
TM 225/A
Analog input module TM 225/A enables the direct connection of PT100 resistor sensors. Up to four temperature sensors
can be operated with 2- or 4-conductor technique. With the 4-conductor technique, the interference associated with the
conductor lengths is compensated for and the precision of the measurement thereby increased.
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