H69.0.21.6C-03
Operating Manual GCO 100
page 9 of 12
8 Alarm functions
There are 3 possible settings for the alarm function: off (AL oFF), on with horn (AL on) and on
without horn (AL no.So)
The alarm will be issued under the following circumstances:
-
measuring value higher or equalling upper alarm limit ’AL.Hi’
- sensor error
- measuring values exceeding/falling below measuring ranges
-
battery voltage too low or error in device (’Err.7’)
The alarm is supported by the interface, thus, it can be monitored by a connected computer.
The acoustic alarm is depending of the value. It is an interrupting tone, increasing in intensity with
the value, above 300ppm the tone is permanent.
Visual alarming: „AL.Hi“ flashes in the display
Additionally the exceeding of the MAK value is signalled with the MAK-arrow independently from
the alarm settings.
Because the maximum working place concentration differ from country to country, this value is
adjustable.
9 Adjustment
The adjustment of the GCO100 is stable within 5% within in a year.
The measuring precision can be checked by means of suitable test-gas mixtures and the suitable
testing accessories. Alternatively the instrument can be sent to the manufacturer for test and
recalibration.
Attention! If the adjustment is altered, the included Calibration protocol is no more valid!
9.1 Adjustment menu
To adjust a measuring offset and scale proceed like follows:
Switch off instrument.
Switch on
and press
“Hold”-key during the segment test
( ), until the display shows the first
parameter “OFFS”
Press “up” or “down” key, the currently selected offset adjustment appears.
Choose the desired value by pressing “up” or “down” key. (max. selectable values: ±20ppm)
Enter by pressing On/Off-key: OFFS appears in the display again
Selsect the next parameter by pressing On/Off-key: SCAL appears in the display
Press “up” or “down” key, the currently selected scale appears
Choose the desired value by pressing “up” or “down” key. (28.00 ... 62.00 nA/ppm).
Store the values by
pressing ‘On/Off’ key. The instrument will restart (segment test).
Please note:
If during the changing of the offset adjust no key is pressed within 120
seconds, the input will be aborted. Eventually made changes won’t be
stored!
9.2 Automatic zero point adjusting
To compensate a deviation of the zero point proceed like following:
Switch on instrument and bring it to a CO-free atmosphere (fresh air or good vented room
without any CO sources)
If there was measured at higher CO levels before, please wait at least 3 minutes.
press
Hold-key 5 seconds
, until the display shows “
nuLL
”
The zero point adjusting is now performed automatically and will be stored in the instrument. The
instrument will automatically show the measured value after successful adjustment.
If the adjusting could not be performed (display shows nuLL permanently), there is a higher CO-
value in the ambient air or the sensor is defect. Turn device off and on to return to measuring
–
Note: zero point adjusting was not stored.
The zero point can be viewed in the adjustment menu
at parameter “OFFS”.
