Dräger Polytron 3000, Instructions Manual, Page: 5 / 68

5
Design
Design
Polytron 3000 is designed for connection to the Dräger Polytron, Regard, Quad-
Gard or Unigard central units.
The Polytron 3000 transmitter may also be connected to other central units if the
following conditions are met:
— Industrial standard 4 to 20 mA input signal
— Operating voltage at the transmitter 12 to 30 V DC.
On delivery, Polytron 3000 is configured for the measuring range and gas to be
measured. This information can be found on a sticker below the service port and on
the back of the measuring unit. The Order No. of the sensor to be used is also spe-
cified there.
Two different versions of the Polytron 3000 transmitter are available:
Polytron 3000 transmitter with display
This version is intended for installations requiring local indication of the measured
value.
The transmitter is calibrated with the aid of two potentiometers and the display.
Polytron 3000 transmitter without display
This version is intended for installations in which local indication of the measured
value is not required.
A digital voltmeter is required for calibration.
Optional extras:
Duct Extension
For mounting the Polytron 3000 transmitter on a duct.
For measuring the gas concentration in the pipe or duct. This option does not affect
the explosion-protection approval of the transmitter.
ST–691–2002–1.eps
ST–691–2002–2.eps