Bacharach H-25C, Инструкция

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H-25C Instruction Manual
Instruction 3015-0216
40
4.2.6 How to Check the Measured Value, and Possible Reasons for Abnormal Operation
[How to Check the Measured Value]
To check for error in the measured value, set a leak standard for a known constant leak rate, let the
probe suck in the gas, and examine the indicated value. Use pass/fail mode during this
measurement.
Note: If the instrument has the auto calibration option to display current calibration-gas flow rate in
the data display section, set the ' UNIT " switch as shown in the figure below. Note that the displayed
value is the result of computation based on the secondary pressure of the calibration gas. The
displayed value may differ from actual value if dirt is attached in the capillary or the gas leaks from
the gas bleed plug.
[Cause of Abnormal Symptoms]
If the instrument shows symptoms of abnormal operation during measurement or calibration, the
most likely reasons are as follows:
•
"AIR FLOW" indicator is ON.
Probe filter is clogged. (See Section 5.1 for corrective action.)
•
Leak rate displayed is too high.
Activated charcoal filter performance is deteriorating. (See Section 5.2 for corrective action.)