Teledyne 9110T instruction manual Check if the particle filter is clogged, High Flow

Model 9110T NOx Analyzer Troubleshooting & Service

2.If the actual flow is low or zero, check if the pump operates properly. The RCEL pressure should be below 10 in-Hg-A at sea level.

∙If it is above 10”, rebuild the pump (Section 11.3.4.1). Check the spare parts list in Appendix B on how to order pump rebuild kits.

3.Check if the particle filter is clogged.

∙Briefly remove the particle filter to see if this improves the flow.

∙Be very cautious when handling the Perma Pure dryer fittings (see Section 11.3.2 on proper handling instructions).

∙If the filter is clogged, replace it with a new unit.

∙If taking off this filter does not solve the problem, continue to the next step.

∙Do not leave the Perma Pure dryer without filter for more than a few seconds, as you may draw in dust, which will reduce the performance of the dryer.

4.A leak between the flow meter and the reaction cell (where the flow- determining critical orifice is located) may cause a low flow (the system draws in ambient air through a leak after the flow meter).

∙Check for leaks as described in Section 11.3.12.

∙Repair the leaking fitting, line or valve and re-check.

5.The most likely cause for zero or low ozone flow is a clogged critical flow orifice or sintered filter within the orifice assembly.

∙The orifice that sets the ozone flow is located on the reaction cell.

∙Check the actual ozone flow by disconnecting the tube from the reaction cell and measuring the flow going into the cell.

∙If this flow is correct (~80 cm³/min), the orifice works properly.

∙If this flow is low, replace the sintered filter.

∙The orifice holder assembly allows a quick and easy replacement of the filter (see Section 11.3.5 and on for replacement procedures).

∙Appendix B lists a spare part kit with a complete orifice assembly that allows a quick replacement with minimum instrument down-time.

12.4.1.3. High Flow

Flows that are significantly higher than the allowed operating range (typically ±10-11% of the nominal flow) should not occur in the 9110T unless a pressurized sample, zero or span gas is supplied to the inlet ports.

∙Ensure to vent excess pressure and flow just before the analyzer inlet ports.

Teledyne Analytical Instruments 274