Teledyne 9110T instruction manual Teledyne Analytical Instruments 317

Model 9110T NOx Analyzer Troubleshooting & Service

QUESTION

Can I use the IZS option to calibrate the analyzer?

How do I measure the sample flow?

Can I use the DAS system in place of a strip chart recorder or data logger?

How often do I need to change the particulate filter?

How long does the sample pump last?

Why does my RS-232 serial connection not work?

How do I make the instrument’s display and my data logger agree?

ANSWER

Yes. However, the accuracy of the IZS option’s permeation tube is only ±5%. Whereas this may be acceptable for basic calibration checks, the IZS option is not permitted as a calibration source in applications following US EPA protocols.

To achieve highest accuracy, it is recommended to use cylinders of calibrated span gases in combination with a zero air source.

Sample flow is measured by attaching a calibrated flow meter to the sample inlet port when the instrument is operating. The sample flow should be 500 cm³/min ±10%.

Section 13.3.12.3 includes detailed instructions on performing a check of the sample gas flow.

Yes. Section 7 describes the setup and operation of the DAS system in detail.

Once per week or as needed. Section 11 contains a maintenance schedule listing the most important, regular maintenance tasks. Highly polluted sample air may require more frequent changes.

The sample pump should last one to two years and the pump head should be replaced when necessary. Use the RCEL pressure indicator on the front panel to see if the pump needs replacement.

If this value goes above 10 in-Hg-A, on average, the pump head needs to be rebuilt.

There are several possible reasons:

∙The wrong cable: please use the provided or a generic “straight- through” cable (do not use a “null-modem” type cable) and ensure the pin assignments are correct (Sections 3.3.1.8 and 6.3).

∙The DCE/DTE switch on the back of the analyzer is not set properly; ensure that both green and red lights are on (Section 6.1).

∙The baud rate of the analyzer’s COMM port does not match that of the serial port of your computer/data logger (Section 6.2.2).

This most commonly occurs when an independent metering device is used besides the data logger/recorder to determine gas concentration levels while calibrating the analyzer. These disagreements result from the analyzer, the metering device and the data logger having slightly different ground levels.

Use the data logger itself as the metering device during calibration procedures.

Teledyne Analytical Instruments 317