Gasman Operation
9
II. Operation
2.1 Switch-on sequence
1. Ensure the unit is in clean air.
NB. For CO2 detectors see zeroing, Section VII.
2. Switch on
Press and hold the operator button for approximately 3 seconds
until the red LEDs flash.
The instrument begins with testing all the LCD segments on the
operator display screen, the red and blue alarm LEDs, sounder and
internal vibrator alert. The sounder may be silenced by pressing
the button. The unit enters a warm up mode and displays a
sequence of screens, see page 3 for more details. At the end of
warm up, the Autozero menu will be displayed.
3. Autozero
Press the operator button with a single click to confirm
Autozero. Flammable and toxic units will be set to read zero
and oxygen units set to read 20.9%. If the operator button
is not pressed within 10 seconds Gasman will proceed
directly to normal operation without performing a zero.
Switch off
To switch off the unit, press and hold the operator button for 5
seconds. The display will count down from 5 until the unit counts
down to shut off.
The Autozero function can be disabled
or set to run automatically, without user
confirmation: Autozero will not appear.
See section VIII PC Interface and software.
Battery check
Usethistimetocheckthereis
sufficient charge in the battery
pack
!
Calibration check
During the warm up sequence, if the next calibration date is due in less than 31 days,
‘CAL - nn’ will be displayed (where nn is the number of days to the next calibration). If
calibration is already overdue, the Gasman unit will display a warning message ‘CAL’.
The instrument can still function, but it is strongly recommended the unit is sent for
calibration as soon as possible.
Press the button to continue to Run mode.
The Gasman can be set, using Portables PC software, to lock out in the event of the
calibration due date expiration in order to prevent further operation of the detector until
a calibration is preformed.
NB. If Autozero
fails, a warning
message will be
displayed.
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