GD10P User Manual Page 26 of 44 850-811250-Rev.06b
6.3 Calibration test
A calibration test is not required to verify the correct function of the detector. Normal
maintenance of the detector is covered by the simple function tests described in
sections 6.1 and 6.2. The following calibration test is only applicable if it is required
by regulations or in cases where you need to verify system performance during
commissioning or similar thorough testing.
The GD10P detectors have a fixed calibration from the factory. A calibration test is thus just a
test. There are no means to change the calibration on-site.
In order to perform calibration test, use a calibrated gas and apply it via a
Sample Flow Housing (reg. no. 499-810874).
1) Remove the Weather Protection and clean the optical surfaces.
2) Attach the Sample Flow Housing. This is just press fit with two o-ring seals.
Please note that the seals are not equally sized, so note the location of the
test nozzle close to the detector housing.
3) Apply a certified test gas of approx. 50 % of GD10P calibrated range as
shown in the drawing. The test gas should be the same as the target gas.
Gas flow should be approx. 1 liter/minute.
Wait approx. 2 min. to ensure that the Sample Flow Housing is completely filled with gas.
Read detector output or read output through the gas detection system. The reading should be
within the tolerance of the detector plus the tolerance of the test gas. In practical terms this is
the gas concentration +/- 10% of full scale.
6.4 Re-zero
This maintenance activity should only be carried out by special trained operators. If
this is not done in a controlled and proper way, the performance of the detector can
be reduced. Simtronics has no responsibility for faults introduced by on-site re-zeroing
The GD10 detector is calibrated and temperature tested in a controlled environment at the
Simtronics factory. No further calibration is required during the life time of the product, as the
zero point and calibration will stay inside the given tolerances. This implies that slight offsets
from the zero point of 4.0mA (0%LEL) is to be expected and values up to 4.5mA at room
temperature are within specification.
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