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Teledyne API Model 300M CO Analyzer Instruction Manual, 04033, Rev. A
In general, flow problems can be divided into 3 categories:
1. Flow is zero (no flow)
2. Flow is greater than zero, but is too low, and/or unstable
3. Flow is too high
Figure 1-1 in this manual provides a schematic diagram of the flow in a Model 300M.
WARNING
Hazardous voltages present - use caution.
Flow is zero:
1. Confirm that the sample pump (sample flow) is operating (turning). If not, check the 115V
power to the pump. If the pump does not operate with 115V present at its terminal, replace
the pump. Check for plugged pneumatic lines, filters, or orifices.
2. If the pump is over-heated due to the line voltage (exceeding 119 VAC, etc) or high ambient
temperature, it will run intermittently causing flow failure.
Low Flow:
1. Check for leaks as described in Section 11.3. Repair and re-check.
2. Check for dirty sample filter or dirty sintered filter.
3. Check for partially plugged pneumatic lines, flow restrictor, or valves.
High Flow:
1. The most common cause of high flow is a leak around the flow restrictor. To correct, remove
the flow restrictor and replace O-rings, and re-assemble.
10-9