User Manual

MODEL 2230R, Process Hydrogen Analyzer
Page 10
3.3 PROCESS CONNECTION
Model 2230R offer a variety of fittings to mate the unit to a process stream. The following table
lists our standard fitting selections. Others are available upon request.
• ½” MNPT thread
• ½” FNPT thread
• -8 SAE/MS thread size
... and many other industry standards.
3.4 PROCESS CONNECTION
Power (8 to 13 VDC) is connected via the Power/Analog connector as shown in Section 4.1.
Once power is applied, the unit executes a warm-up sequence lasting five minutes. The status
LED will be amber in color during the warm-up sequence. When the unit is ready for operation,
the status LED will change to green (if the measured hydrogen concentration is under the first
relay set point) and to red (if it exceeds the second relay set point). The following operations
will be completed in this warm-up sequence:
• Heat the sensor to operating temperature
• Perform system self-test
After warm-up, the Model 2230R Analyzer should be run in a hydrogen concentration
exceeding 5% by volume for at least an hour. Oxygen will readily adsorb on the Model 2230R
Analyzer and can confound the hydrogen measurements. If the sensors are left in oxygen, air or
any environment without hydrogen for long periods of time, they must be conditioned in
hydrogen to remove adsorbed oxygen and taken through the Verification process to check
accuracy. Failure of the Verification will require that the sensors go through Calibration. Both
procedures are described later in this manual.
The Model 2230R Analyzer can be exposed to oxygen for short periods of time without adverse
effects if the unit is turned off. If the units are operated in oxygen or stored in air for longer
than a week, the units’ hydrogen readings may be high due to oxygen adsorption on the sensor.
Hydrogen exposure will then cause the readings to drift lower as adsorbed oxygen is slowly
removed and the unit recovers to normal steady behavior.
If this drift behavior is observed, the sensor should be conditioned by operating in a hydrogen
concentration exceeding 5% until the readings are stable. The required hydrogen conditioning
may vary from several hours to several days depending on the level of oxygen exposure. Higher
hydrogen concentrations used during conditioning may accelerate the process. Once stable, the
unit should be taken through Verification to check accuracy and Calibration if needed.
WARNING: MODEL 2230R PROCESS HYDROGEN ANALYZERS ARE
CALIBRATED IN A HYDROGEN/NITROGEN (H₂/N₂) BACKGROUND AND
SHOULD NEVER BE OPERATED IN AN AIR OR OXYGEN BACKGROUND.