Bieler+Lang ExDetector HC 150 - Connection Example; Potential Equalisation; Screening; Commissioning

Page 4 Technical Status: 11/2010
Gas Detector
Operating and Installation Instructions
ExDetector HC 150 / HC 150-K
Connections
Potential Equalisation
The detector housing must be connected to the equipotential bonding of
the explosion hazard zone.
In addition, valid national installation regulations must be observed. The
following regulations were valid in Germany at the time of going to press:
● ElexV Regulations covering electrical installations in areas where there is
an explosion hazard
● DIN VDE 0165 / 2.91 Installation of electrical apparatus in areas where
there is an explosion hazard
● Ex-RL Rules for avoiding dangers from a potentially explosive atmosphere
with a collection of examples - Explosion Protection Rules
Example: Connection to GMC8022
Screening
The screen is to be connected to the detector housing by means of the
cable gland. Connect the screen as shown in the diagram.
● The screen conductor must be connected to the equipotential bonding of
the area where there is an explosion hazard.
Commissioning
● Switch on the evaluation unit (power supply).
● After 30 minutes warm-up time, check operation of the detector / evaluator
combination with test gas.
Evaluation
instrument
Safe area Hazardous area
Voltage equalisation point
ExDetector
HC 150
KL 1+24VDC
KL 2
4...20mA
KL 3
GND
Detector-
elektronic
KL 1
+24VDC
KL 2
4...20mA
KL 3
GND
GMC
8022
Zone 2 safe area