DrägerSensor IR – Installation Instructions
Any use of the gas sensor requires full understanding and strict observation of the Instructions for
Use of the DrägerSensor IR (Order No. 902384).
How to Install the Gas Sensor
Only trained service personnel (e.g. Dräger Safety service personnel) may install the gas sensor under observation of relevant regulations.
Mounting Location
The protecting effect of the gas sensor depends on the selection of the mounting location. By taking the site's air flow conditions into account,
the best possible mounting location should be chosen as close as possible to where a decisively noticeable rise in gas concentration can be
expected in case of a leakage, i. e.
— as close as possible to the potential leakage place
— when monitoring gases and vapours which are lighter than air: above the potential leakage place
— when monitoring gases and vapours which are heavier than air: near to ground.
In addition, it must be assured that:
— the air circulation in the gas sensor vicinity is not hindered
— the danger of mechanical damage is reduced as far as possible
— the gas sensor is sufficiently accessible for maintenance purposes. Especially the configuration via magnetic pin requires a clearance of
approx. 20 cm around at least half of the sensor perimeter.
The gas sensor can be mounted horizontally as well as vertically.
Electrical Installation
The entire wiring must correspond with applicable local regulations concerning the installation of electrical devices in potentially explosive
atmospheres. In case of doubt, the official responsible authorities are to be consulted prior to installation of the device. We recommend a
three-core, screened connection cable (mesh wire shield with a shielding factor of
≥
80 %).
z
If the corresponding connection is available: Electrically connect the terminal box with earth.
z
For installation in protection pipe: cast protection pipe seals and allow to harden.
z
Do not connect gas sensor to the power supply before the wiring is complete and has been tested.
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When connecting, observe the correct polarity of the gas sensor (protection against polarity reversal up to max. 1 A).
z
When installing a complete set (see "Order List" in the Instructions for Use of the DrägerSensor IR): Depending on the housing type of the
terminal box there are the following permissible conductor cross sections:
Mechanical Installation
Terminal Box
The gas sensor is designed to be directly attached to a terminal box. Approved terminal boxes of the follo-
wing makes are available as gas sensor accessories: Ex d (explosion proof, 3/4 " NPT) and Ex e
(increased safety, M25) (refer to the Instructions for Use).
z
The enclosed O-ring seal must be used for a connection using type of explosion protection Ex e, to
maintain the housing protection class. The M25 nut (torque of 15 Nm ±3 Nm) must be secured against
self-loosening a using thread locking adhesive, e.g. Loctite
®
.
z
Any unused cable entry openings at the terminal box must be closed using approved plugs.
Splash Guard and Calibration Adapter
We recommend using the supplied accessories - splash guard
(1)
and calibration adapter
(2)
- to increase
protection against water jets and contamination.
The splash guard is held by a fixture provided with screw-thread, which is also used as calibration adap-
ter.
The correct fit of the calibration adapter must be ensured. To correctly fit the calibration adapter, tighten it
by hand until the sealing line leaves a permanent mark in the splash guard.
NOTICE
If present: If the connector of the gas transmitter is not required, it must be removed prior to the electrical installation.
To do this, use a suitable tool to sever and isolate the cables directly before the connector.
NOTICE
Earth leakages on two phases can cause EMC problems. To avoid these problems, the cable screen may only be connected to earth poten-
tial on one side (either at the central unit or at the gas transmitter). In most cases we recommend connecting the cable screen to the PE ter-
minal of the terminal box instead of connecting it to the central device.
Order No. 68 11 165: 1,0 bis 2,5 mm
2
Order No. 68 11 265: 0,5 bis 4,0 mm
2
Order No. 68 11 185: 0,2 bis 4,0 mm
2
00223867
01.eps
0
S
(1)
(2)