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9
MAINTENANCE
9.1
CLEANING
If the unit is exposed to debris, condensates or other material that may collect over the sensor tip
then the unit should be cleaned by a gentle wiping with a clean lint-free cloth or paper.
10 CALIBRATION
Calibration can be accomplished through the serial port or the keypad. Calibrations do not cause any wear
on the sensor and can be accomplished as often as desired. Analog outputs can be monitored.
10.1 FACTORY CALIBRATION –
Contact H2scan to make arrangements for a comprehensive Factory Calibration by H2scan's factory
trained technicians; optional NIST traceable certificate available upon request. An annual Factory
Calibration is advisable to optimize performance.
10.2 FIELD CALIBRATION
In the event the Field Calibration procedure seems to not be effective, H2scan recommends the unit
be shipped back to the factory for a comprehensive evaluation and Factory Calibration.
11 FIELD CALIBRATION
11.1 CALIBRATION INTERVAL
H2scan recommends that the system calibration be carried out every 90 days.
11.2 GASES
Field Calibration requires the availability of ambient, hydrogen-free air and one or two certified gases
with a nominal hydrogen value by volume in a balance of air. The flow rate required is 0.5 ± 0.2
slpm. One gas will correct any offset error while two gasses will also correct any gain error. It is
recommended to use two gasses to obtain superior calibration accuracy.
DO NOT use 0% H2 as the lower calibration gas. Instead use hydrogen concentration that is slightly
lower than the expected lowest hydrogen concentration. For the second calibration gas use a
concentration that is slightly higher than the expected maximum H2 concentration.
Custom Field Calibration Kits are available from H2scan.
The accuracy of the gas bottle concentration will directly affect the measured accuracy by the units.
During factory calibration, the units are calibrated with high accuracy gases (as high as +/- 0.02%). It
is strongly recommended that the user perform calibration with similar high accuracy gases to
maintain the highest accuracy.
11.3 TIMES
Each calibration gas should be applied for at least 10 minutes for the most accurate results. Actual
times required may vary.
11.4 GAS CONNECTION
Gases are applied to the unit via the gas application kit available from H2scan.
11.5 PROCEDURE
During the Field Calibration process any previously completed Field Calibrations are cancelled. As a
result, during the routine the unit may display a hydrogen concentration that is different from the
applied gas concentration. This is normal. Once the procedure is completed, the readings will be
corrected to display the right concentrations for all subsequent exposures.
NOTE: Field calibration must ALWAYS be done at the customer's local atmospheric pressure.
90000012 R8
HY-ALERTA™ 1600, Intrinsically Safe Area Hydrogen Monitor
OPERATING MANUAL
Page 17 of 31
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