Start-up
12
Start-up
Switch on power supply.
The transmitter begins its warm-up routine.This is indicated by a flashing dis-
play. The warm-up phase takes between 5 minutes and 12 hours, depending
on the sensor installed. Note the information in the sensor data sheet. The
warm-up phase may take longer in extremely high or low temperatures. It is
completed when the display stops flashing.
When the sensor has warmed up:
— Transmitters set for specific calibration with calibration gas
Calibrate sensor, page 14.
— Transmitters set for use of the manufacturer's calibration setting for the sensor
Transmitter is ready for use.
Check signal transmission to the central unit and alarm output.
Analogue signal
— A current between 4 and 20 mA flows through the transmitter during normal ope-
ration. This current is proportional to the gas concentration.
— Polytron 3000 uses various current values to indicate the operating status of the
transmitter:
Display (optional)
Current Meaning
4 mA Zero point
20 mA Full-scale value
<3.2 mA Transmitter fault
3.8 mA ... 4 mA Sensor drift below zero point
20 mA ... 20.5 mA Full-scale value exceeded
3.4 mA ±0.2 mA
constant
Maintenance signal
— In measuring mode, the display shows the actual gas concentration, e.g.:
— The following symbols may be displayed during measurement:
— If a fault has been detected:
— If the measuring range has been exceeded:
— If the zero point is too low (sensor drift below the zero point):
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