GMI PPM Gasurveyor 500, User Handbook Manual

Page: 25 / 90

15
OPERATION
Calibration Date Features
At the end of warm-up and before the PPM Gasurveyor
500 instrument is ready for measuring, the instrument will
indicate on the display when the next calibration is due.
This will be displayed as month and year, as shown in
Figure 3.3:
(Alternate flash)
Calibration Due
February 2002
Figure 3.3 Calibration Date
The re-calibration interval pre-set for all PPM Gasurveyor
500 instruments is twelve (12) months.
This period can be altered as an option, however, you
should ensure that the instrument is always within its
calibration period prior to use.
An option which ensures that an ‘out of calibration
instrument’ is not used, is the automatic switch-off when
overdue.
Switching Off the Instrument Pump
A single press of Button One when the pump is
running turns the pump off and stops sampling. Pressing
button one again turns the pump back on.