DT4120 xx xx (PS)
8
20170324-V0
Operating principle
The measuring current flows through the sensor / resistance
/ potentiometer connected to the input. The voltage drop on
the measuring sensor is compared with the voltage drop on
the internal reference resistor. The voltage difference is led
to a 21 bit A/D converter. The digital output signal of the
A/D converter is processed by a microcontroller.
The microcontroller drives the 5 digit LED display,
processes the front panel membrane keypad, drives the
limit relays, the analogue output and the communication
output.
Power supply
The instrument has two power supply version:
DT4120 xx xx xx: 18-40 V AC/DC 3VA / 3.5 W
DT4120 xx xx xx PS: 180-250 V AC/DC 3VA / 3.5 W
3.4. Adjustment
The DT4120 xx xx (PS) can be adjusted through the
3 button front panel keypad. All configuration parameters
are stored in the instrument EEPROM for unlimited time,
even when the supply voltage beeng switched off.
The instrument doesn’t need any internal adjustment.
Summary of Contents for DT4120 Series
Page 1: ...DT4120 xx xx PS Temperature Resistance Potentiometer Meter Transmitter Operating Instructions...
Page 84: ...DT4120 xx xx PS 84 20170324 V0 10 2 Application example Analog output option...
Page 85: ...DT4120 xx xx PS 20170324 V0 85 RS232 communication interface option...
Page 86: ...DT4120 xx xx PS 86 20170324 V0 RS485 communication interface option...
Page 87: ...DT4120 xx xx PS 20170324 V0 87 RS485 bus topology...
Page 90: ...DT4120 xx xx PS 90 20170324 V0...
Page 91: ...DT4120 xx xx PS 20170324 V0 91...
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