Compur Ex plus Gas Detector User Manual download pdf (Page 19)

Triple Plus+ and Triple Plus+ IR Quickcal

3.3 Quickcal

The instrument has the ability to perform a ‘quick calibration’ of four gas chan-

nels: CH4; CO; H2S and O2 in ‘one go’. The system prompts the user through

the procedure. Before QuickCal is initiated, the instrument should have been

zeroed. Now follow this procedure:

Press both of the middle 2 buttons, and hold them down for 5-7 seconds.

The instrument will announce that the Quick Calibration has been initiated,

and remind the user that the instrument should have been zeroed before this

procedure is invoked.

The instrument will now alternately flash the gas concentrations it is expecting

to be applied and the prompt CALIBRATE ALL INPUTS, with the two outer keys

labelled with YES and NO. Pressing YES moves on in the QuickCal sequence,

NO abandons the QuickCal and the instrument returns to the normal gas

monitoring screen.

The instrument will now issue the prompt 'Is gas on sensors?' with the two

outer keys labelled YES and NO as before. Ensure the correct test gas is applied

to the instrument, and press YES. Pressing NO returns the instrument to the

normal gas monitoring display.

If YES is pressed the display will change to SENSORS SETTLING, with a line of

dots appearing on the bottom line of the display to indicate the instrument is

working. The instrument will now wait until there appears to be a good steady

flow of gas, and then the calibration will be performed. If the instrument per-

ceives that the gas level is not steady then the message 'Gas not stable!' will

be displayed and the calibration aborted.

If all channels are successfully calibrated the instrument will display the message

'Calibration successful', otherwise the message 'Calibration failed!' with the list

of gases that failed the calibration displayed.

When performing a calibration with a gas from a pressurised source, the instru-

ment’s pump (if present) should always be turned off.

3.4 Pellistor saving (Triple Plus+ only)

To avoid the pellistor sensor being damaged by exposure to excessive levels of

flammable gas, it is protected automatically. Pellistor saving may be triggered

in two ways: On dual range flammable instruments (i.e. those with a pellistor

measuring LEL and a thermal conductivity block measuring % volume) a per-

centage volume of gas may be specified at which the pellistor will be switched

off. This percentage is configurable by computer using the Portables PC soft-

ware, and is 5% by default (see below).

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Compur Ex plus Gas Detector User Manual Page 19