User Manual

MODEL 2230R, Process Hydrogen Analyzer
Page 12
• If the unit gets exposed to extended periods of no H₂ (or some Oxygen), condition the
sensor as described in the Start-up section and follow-up with a Field Verification (and Field
Calibration, if needed).
• Effect of pressure: The Model 2230R Analyzer is hydrogen specific and sensitive to only the
hydrogen partial pressure in the gas stream. Since changes in total gas pressure will affect
the hydrogen partial pressure, they will also affect the sensor readings. For instance, at one
atmosphere pressure, a 50% H₂/N₂ mixture will be reported as 50% from the unit. At 1.1
atm, the reading will increase to 55% and two atms will result in a reading of 100%. In fact,
the Model 2230R Analyzer are capable of measuring multiple atmospheres of hydrogen and
readings above 100% H₂ are interpreted as hydrogen pressures above one atmosphere. So,
for example, a reading of 150% H₂ means 1.5 times the hydrogen pressure of a 100% H₂
concentration at one atmosphere. At the factory, the units are calibrated at one
atmosphere pressure. Performing the Field Calibration at the operating pressure will display
the pressure corrected reading. For example, if the local atmospheric pressure is 0.97 atm,
doing a Field Calibration will correct for this.
• Verification/Calibration gas bottle accuracy: The inaccuracy 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% accurate). It is strongly
recommended that the user perform calibration with similar high accuracy gases to
maintain the accuracy specified in the manual.
4. ELECTRICAL & COMMUNICATION
4.1 CONNECTIONS
Power/Analog Output - Connector 1
Supplied Cable – 4m (12 ft.) standard length (Other lengths available)
Wire Color Description
Brown +8 VDC to +13 VDC
White VDC Return
Black Positive Analog Output
Blue Analog Output Return
WARNING: IF THE UNIT IS INSTALLED IN A CLASSIFIED LOCATION THEN IT
IS THE RESPONSIBILITY OF THE USER AND INSTALLER TO MAKE
CONNECTIONS TO RELATED EQUIPMENT IN A MANNER CONSISTENT
WITH THE LOCATION
CLASSIFICATION.