Dräger Polytron 7000 Instructions For Use Manual page 23

3. If necessary, insert the sensor.
4. Place the mounting ring (1) of the pump adapter over the sensor opening.
5. Screw the bayonet ring back on.
6. Tighten the hexagon socket screw at the bayonet ring.
7. Observe the installation direction of the pump adapter.
The installation direction certain the direction of gas flow between pump and
sensor (mode of operation).
8. Insert the bushings of the pump adapter into the bore holes in the underside of
the docking station.
 The sealing slides over the sensor.
9. Turn the mounting ring in clockwise direction until the pump adapter is secured.
5.4.2 Information about the installation of the aspiration line
The selection of the material of the aspiration hose/aspiration pipe and the
aspiration distance influence the response time of the measured signal. In the worst
case, reaction with the material used or absorption can result in no measurable gas
concentration reaching the sensor.
A pressure difference between the aspiration location and the environment of the
gas detector can lead to an additional measuring error. The maximum permissible
pressure difference is 50 mbar.
Contact Dräger for information about selecting a suitable hose/pipe material.
5.5 Commissioning the gas detector
Prerequisite:
– The sensor is installed.
1. Switch on the power supply.
 The gas detector starts the warm-up phase.
 The time remaining until the sensor reaches operational readiness. The
Mode of operation Description
Grommets for sup- The pump is upstream of the sensor in the gas flow; the
ply and waste air sensor is on the overpressure side of the pump.
This is the preferred mode of operation for all sensors.
point to the left,
symbol points to the
front
Grommets for sup- The pump is downstream of the sensor in the gas flow;
ply and waste air the sensor is on the negative pressure side of the pump.
This mode of operation should be chosen only in justified
point to the right,
cases.
symbol points to the
For the DrägerSensor O
front
ation is only permissible up to a maximum flow rate of 0.5
L/min.
This mode of operation is not permitted for the Dräger-
Sensor O
maintenance signal is issued. If a relay module is installed, the fault relay is
energised.
Dräger Polytron 7000
Installation & commissioning
LS (6809630) the mode of oper-
2
(6809720).
2