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Model 400E Ozone Analyzer
Instruction Manual
If gas flows through the instrument when it is disconnected from its sources of Zero
Air, Span Gas or Sample Gas, the flow problem is most likely not internal to the
analyzer. Check to make sure that:
All Calibrators/Generators are turned on and working correctly.
Valves, regulators, and gas lines are not clogged or dirty.
11.2.1.2. Low Flow
1. Check if the pump diaphragm is in good condition. If not, rebuild the pump (see
Section 9.3.2). Check the Spare Parts List for information of pump rebuild kits.
2. Check for leaks as described in Section 9.3.4. Repair the leaking fitting, line or
valve and re-check.
3. Check for the sample filter and the orifice filter for dirt. Replace filters (see
Sections 9.3.1 and 9.3.4 respectively).
4. Check for partially plugged pneumatic lines, orifices, or valves. Clean or replace
them.
5. If an IZS option is installed in the instrument, press CALZ and CALS. If the flow
increases then suspect a bad Sample/Cal valve.
11.2.1.3. High Flow
The most common cause of high flow is a leak in the Sample Flow Control Assembly
or between there and the pump. If no leaks or loose connections are found in the
fittings or the gas line between the orifice and the pump, rebuild/clean the Sample
Flow Control Assembly as described in Section 9.3.5.
11.2.1.4. Actual Flow Does Not Match Displayed Flow
If the actual flow measured does not match the displayed flow, but is within the
limits of 720-880 cc/min, adjust the calibration of the flow measurement as
described in Section 9.3.6.
11.2.1.5. Sample Pump
The sample pump should start immediately after the front panel power switch is
turned ON. If it does not, refer to Section 11.5.1.
P/N 04316 Rev: B
TROUBLESHOOTING & REPAIR PROCEDURES
253
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