This sequence first indicates if the
zero operation passed or failed, then
the new detector reading then the
option to end and return to the
engineer menu. This sequence
effectively allows the engineer to
observe the new detector zero point
before exiting.
Known Calibration
Gas to Traceable
standard.
Regulator to deliver a fixed
flowrate (typically between
0.5 to 1 L/min)
Hose delivers zero gas to the
detector. Note a test gas applicator
is usually required. In some cases
weather protection guards or the
detector itself may include a gas
applicator port. If not the correct
calibration gas adaptor must be
used.
co
0-100 ppm
ADDRESS
4101
CARBON MONOXIDE DETECTOR
Gas Detector CAL Function
Gas detectors must be calibrated with known calibration gases traceable to National Standards. As previously
discussed detectors require regular calibration. Calibration gases should have values chosen that either:
a) Are at the alarm set point to get maximum accuracy at this point
or
b) Are between 50 to 90% of the range of the detector. The detector measuring range will normally be marked on
the detector.
To CAL the detector enter password mode
as previously described and enter
password 100 to enter the user menu.
Select menu item 2 CAL
The top line of the display shows the current
reading. The bottom line shows the current
option.
With CAL gas flowing and the reading stable
press the button to select CONTINUE. Now
press and hold the button until prompted to
release to action the zero request.
CAL
2 of 8
55 PPM
Abort
55 PPM
Continue
CAL
PASSED
50 PPM
CLICK TO
The display shows the result of the cal request, note that the actual zero and
calibration values are stored on the individual detector heads. When carrying out a
zero or calibration the controller sends the request to the detector head for action
and monitors the result. This means that detectors can be supplied pre-calibrated
The reading is now displayed so the result of the cal request can be observed. The
reading should be stable. Click the button to return to the previous menu.
á
1
sensor
á
50
BOTTLE
Enter the channel number you wish to
calibrate.
Enter the calibration gas value, this will be
marked on the gas bottle and enter.
Page 25 of 25
Repeat this sequence if you
are not /-2% of the
gas bottle value.
www.sensors.ltd.uk
A Division of International Gas Detectors
Tel: +44 (0)161 483 1415
Fax: +44 (0) 161 484 2345
Email: [email protected]
