Teledyne 100E, Instruction Manual

Page: 206 / 258

TROUBLESHOOTING & REPAIR Model 100E Instruction Manual
204 045150102 Rev XB1
When troubleshooting flow problems, it is essential to confirm the actual flow rate
without relying on the analyzer’s flow display. The use of an independent, external flow
meter to perform a flow check as described in Section 11.5.2 is essential.
11.2.1.
Zero or Low Flow
11.2.1.1. Sample Flow
If the pump is operating but the unit reports a XXXX gas flow, do the following three
steps:
• Check for actual sample flow
• Check pressures
• Carry out a leak check
To check the actual sample flow, disconnect the sample tube from the sample inlet on
the rear panel of the instrument. Make sure that the unit is in basic SAMPLE mode. Place
a finger over the inlet and see if it gets sucked in by the vacuum or, more properly, use a
flow meter to measure the actual flow. If there is proper flow of around 450-500
cm³/min, contact customer service. If there is no flow or low flow, continue with the next
step.
Check that the sample pressure is at or around 28 in-Hg-A (about 1 in below ambient
atmospheric pressure).
11.2.2.
High Flow
Flows that are significantly higher than the allowed operating range (typically ±10-11%
of the nominal flow) should not occur in the M100E unless a pressurized sample, zero or
span gas is supplied to the inlet ports. Be sure to vent excess pressure and flow just
before the analyzer inlet ports.
When supplying sample, zero or span gas at ambient pressure, a high flow would indicate
that one or more of the critical flow orifices are physically broken (very unlikely case),
allowing more than nominal flow, or were replaced with an orifice of wrong specifications.
If the flows are more than 15% higher than normal, we recommend that the technician
re-calibrate the flow electronically using the procedure in Section 6.7.9, followed by a
thorough and regular monitoring of these flows to see if the new setting is retained
properly.