Teledyne 300E Instruction Manual page 200

TROUBLESHOOTING & REPAIR PROCEDURES
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.
§
Gas bottles are not empty or low.
§
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). Check the Spare Parts List for information of pump rebuild
kits.
2. Check for leaks as described in Section 9.5. 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 9.2 and 9.4.1 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 9.4.1.
11.2.1.4. Displayed Flow = "XXXX"
This warning means that there is inadequate gas flow. There are four conditions
that might cause this:
1. A leak upstream or downstream of the flow sensor
2. A flow obstruction upstream or downstream of the flow sensor
3. Bad Flow Sensor Board
4. Bad pump
200
Model 300E Carbon Monoxide Analyzer
The valve
Instruction Manual
P/N 04288 Rev: A