Compur Ex plus Gas Detector User Manual download pdf (Page 31)

Triple Plus+ and Triple Plus+ IR Appendix 1 – Pumped version (optional)

Appendix 1 – Pumped version

(optional)

The internal pump, when used in conjunction with the external aspirator flow-

head and sampling tube, enables the Triple Plus+/Plus+ IR to monitor inacces-

sible atmospheres. It offers a consistent flowrate and is not fatigued, unlike the

manual hand bulb.

The pump mode may be defined within the calibration menu to be either pump

GO or STOP. This enables the instrument to be used in either pumped or diffu-

sion monitoring mode. See the SETTING UP section above for details on how

this can be configured. Additionally, it is possible to control the pump via the

programmable button as described in section 3.2, Configuration Options.

If the STOP pump mode is selected the pump will not run, and the aspirator

flow head and tubing must be removed to enable gas to enter the sensors by

diffusion.

If the GO pump mode is selected the pump will now run and the aspirator flow

head should now be fitted. Ensure that flexible tubing connects between the

pump inlet nozzle on the side of the instrument and the outlet (‘BULB’ side)

of the flow plate. The sample tube should be connected to the ‘INLET’ side of

the flowhead.

The pump mode is remembered while the instrument is switched off.

On increasing the length of the sample tube, the response time will be affected

and some gases may be absorbed, e.g. chlorine. Add approximately 1.5 sec-

onds per metre of sample tube for gas to reach the instrument (4 mm I.D. tube).

Be careful not to suck water or dust into the instrument, and avoid kinking the

sample tube. If the flow is blocked for any reason, the pump is automatically

stopped, and the warning message 'PUMP FLOW FAIL' appears on the display.

Attend to the blockage and then restart the pump by pressing the right hand

button. (The Crowcon Water Trap may be used when there is the danger of

water ingress). The pump draws power from the Triple Plus+/Plus+ IR battery

pack and so reduces the operating time between recharge. With one flam-

mable sensor installed, the battery life will be around 9 hours, compared to 12

hours without the pump running.

When the instrument is being calibrated from a pressurised gas source, the

pump should always be switched off.

Please note: Pumped units will drain batteries faster than those with-

out, or those with pumps that are not used continuously.

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Compur Ex plus Gas Detector User Manual Page 31