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DT4120 xx xx (PS)
Area of application
20170324-V0
3.3. Principle of operation
DT4120 xx xx (PS) Resistance Thermometer enable
process temperature, resistance value or potentiometer's
wiper position to be displayed on the control panel.
Pt100 / Pt500 / Pt1000 temperature sensor, resistor or
potentiometer can be connected to the input of the
instrument, either with 2, 3 or 4 wire.
Large 14.2 mm height LED display make process value
easily visible at a distance. The displayed value is
proportional to the temperature (sensing by Pt100 / Pt500 /
Pt1000 sensors) or to the resistor value or to the position of
potentiometer's wiper.
Easy on-site configuration through the front panel
membrane keypad is a major advantage of the
microcontroller-based technology. The configuration
parameters: input type, input connection, signal filtering,
output scaling, display refresh rate, limit modes, limit values,
etc. are stored in EEPROM. The settings are protected by a
two-level password against unauthorized manipulation.
Options:
•
Two normally open relay contacts (SPST) for limit
switching or for simple control tasks.
•
4-20 mA / 0-20 mA galvanic isolated scaleable analogue
output. The output can be active (A) or passive (P).
•
RS232 galvanic isolated communication output with
MODBUS RTU slave protocol. Only one instrument can be
connected to the PLC or to the computer.
•
RS485 galvanic isolated communication output with
MODBUS RTU slave protocol. 32 instruments can be
connected to the PLC or to the computer.
Note: either analogue or communication option can be
implemented at the same time.
7
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