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MODEL 2230R, Process Hydrogen Analyzer
Page 22
The Model 2230R Analyzer should be conditioned by operation in hydrogen exceeding 5% by
volume until stable and taken through the Field Calibration, if exposed to oxygen or operated
without hydrogen for an extended period. If the unit continues to exhibit errors in excess of the
published accuracy specification and drift rate, please contact TELEDYNE ANALYTICAL
INSTRUMENTS for factory evaluation and repair.
Verification Procedure
Verification can only be accomplished through interface with the unit via the serial port (refer
to the previous Serial Communication Commands section and the LEVEL 1 COMMANDS table in
Section 4.3). Verification of sensor output should be conducted on a regular basis to insure
proper unit operation. Analog outputs can be monitored through the user’s system. As part of
this sequence the date of verification is stored in the unit’s memory.
Verification Using Serial Interface – After establishing serial communication then follow the
sequence below:
1) Press “Esc”
2) The unit will return the command prompt “H2scan:”
3) Type “e” then hit “Enter” and follow prompts to field verify sensor calibration at two gas
concentrations
These steps will implement the following specification values as an example; for values in bold,
please substitute appropriate values relative to your specific operational conditions:
• Local atmospheric pressure: 0.969 ATM
• Hydrogen range: 0% to 30% hydrogen, balance nitrogen
• Field Verification Gas #1: 1% hydrogen, balance nitrogen (instead of gas #1 being 0%
hydrogen, H2scan recommends Field Verification gases always have a hydrogen
concentration)
• Field Verification Gas #2: 30% hydrogen, balance nitrogen
• Settle Time: 30 minutes (TELEDYNE ANALYTICAL INSTRUMENTS recommends this
duration for field verification)
• Tolerance of Field Verification Gas #1 (1% hydrogen by volume): For example, ± 0.30%
absolute hydrogen by volume (refer to the TOLERANCE CHART above or enter user
desired tolerance) NOTE: Poor accuracy of the verification gases will influence the
achievable accuracy from the unit.
• Tolerance of Field Verification Gas #2 (30% hydrogen by volume): ± 1.0% absolute
hydrogen by volume (refer to the TOLERANCE CHART above or enter user desired
tolerance)
WARNING: IN ORDER FOR VERIFICATION TO SUCCESSFULLY TAKE PLACE,
THE SENSOR MUST BE IN NORMAL RUNNING MODE.