Teledyne T201 manual Autozero Flow Check

Teledyne API Model T201 NH3 Analyzer Operator Manual Maintenance Schedule

18.After the Auto-Tune process is completed, verify that the “process” temperature is indicating that the desired temperature is stable and being regulated.

The converter is now ready for operation.

4.4AUTOZERO FLOW CHECK

Since the T201 is an ammonia analyzer, the flow through the AutoZero orifice is especially important. Check the AutoZero flow as follows:

1.This procedure should be performed with the sample pump running.

2.Remove the top cover of the analyzer. Locate the vacuum manifold at the center rear of the chassis. Locate the 1/8” tube fitting located on the very left side, as viewed from the rear of the analyzer. It will have a label of “0.010” indicating the flow orifice installed.

3.Remove the fitting and attach a calibrated flowmeter to the block fitting capable of measuring in the range of 500 cc/min. The flowmeter should indicate a flow of 500 cc/min 10%.

4.If the flow is outside this range (most likely lower, due to plugging):

1.Turn off the sample pump and instrument.

2.Remove the 1/8” pipe-to-tube fitting and remove the ¼” sintered filter (p/n FL0000001). This filter is meant to protect the orifice; it will usually become plugged and need replacement rather than the orifice. Replace the filter, and then re-assemble the manifold. Restart the sample pump and recheck the flow.

Table 4-3. Flow Check

M501 NH3 CONVERTER SAMPLE FLOW CHECK

Note: Connect both the Teflon tubes between analyzer and converter.

Gas Port	Expected Flow (cc/min)
“SAMPLE IN”	1000 +/- 10 %

ANALYZER SAMPLE FLOW CHECK

Note: Disconnect both the Teflon tubes between analyzer and converter.

Gas Port	Expected Flow (cc/min)
“TO CONV”	1000 or 500, +/- 10 %	When the analyzer is sampling TNx only, the
		bypass flow is measured. Therefore, the flow
		alternates between 500 and 1000 cc/min. This
		is the NOx channel.
“FROM CONV”	500 +/- 10%	This is the TNx channel.

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