Dräger REGARD 2400, Instructions For Use Manual, Page: 43 / 240

Dräger REGARD 2400/2410 43
REGARD 2400 / 2410 in use with Polytron SE Ex sensing heads
7 REGARD 2400 / 2410 in use with Polytron SE Ex
sensing heads
1)
8 Accessories
8.1 Installation of the internal half-bridge converter
Only Dräger REGARD 2400
When one or more Polytron SE Ex sensing heads are connected to the Dräger REGARD 2400,
a half-bridge converter (Order no. SC00016) must be used.
This is necessary because the catalytic sensor in the Polytron SE Ex sensing head operates as
part of a Wheatstone bridge with half of the bridge located in the sensor of the sensing head.
The other half of the bridge is located on the converter board. The half-bridge converter supplies
the sensor and converts the half-bridge signal into a 4-20 mA signal which is processed
internally by the Dräger REGARD 2400.
Procedure:
1. Disconnect REGARD 2400 from the power.
2. Remove short-circuit bridge and insert half-bridge converter.
Fig. 4
NOTICE
When a REGARD 2400/2410 is connected to a catalytic sensor, a half-bridge
converter must be used. 2 different converters can be used:
SC00016 internal converter for the Dräger REGARD 2400
3604655 external converter for all versions (replacement for Part No. 3603560)
1) (Polytron SE Ex Sensor)
i i
00633025_01.eps
Channel D
Channel C
Channel B
Channel A