Dräger REGARD 3900 Series Instructions For Use Manual page 15

5 Installation & commissioning
5.1 General instructions
The following general instructions should be observed for all installation, repair or
maintenance work on the control unit. Information about the transmitters and
sensors can also be found in the "Instructions for Use" of the remote sensor
transmitter.
WARNING
Risk of electric shock!
A non-interrupted power supply can result in personal injury and/or damage to the
control unit, the remote sensor transmitter or the cable.
► Before installation, repair or maintenance work on the control unit, disconnect or
shut down all AC and DC power supplies to the control unit.
1. Disconnect or shut down all AC or DC power supplies to the control unit.
2. Remove the two screws from the cover (5 mm hexagonal key) and open the
front cover.
3. Carry out the necessary installation, repair or maintenance work.
4. Check the sealing ring and close the front cover.
5. Insert the two screws into the cover and secure.
5.2 Positioning and mounting the control unit
Follow the following instructions for the installation location:
– Mount the control unit where that it is easily accessible and the display and
readings are clearly visible.
– Avoid areas where excessive vibrations (frequency above 55 Hz or amplitude
above 0.15 mm) can occur.
– Avoid areas where highly aggressive or corrosive gases, dirt or contaminants
can damage the electronics.
– Temperature conditions: 0 to 55°C.
– Relative humidity: REGARD
REGARD
®
3910 - 0 to 95%, non-condensing.
®
REGARD 3900
®
3900/3920 - 0 to 100%, non-condensing;
Installation & commissioning