Performing A Sample Flow Check; Ac Power Configuration - Teledyne T200H User Manual

Troubleshooting & Service

7.5.3. PERFORMING A SAMPLE FLOW CHECK

Note

7.5.4. AC POWER CONFIGURATION

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ports and plug them (Figure 3-4). Cap the DFU particle filter on the permeation
dryer (Figure 6-2).
•
Pressurize the instrument with the leak checker or tank gas, allowing enough time
to fully pressurize the instrument through the critical flow orifice. Check each tube
connection (fittings, hose clamps) with soap bubble solution, looking for fine
bubbles. Once the fittings have been wetted with soap solution, do not re-apply
vacuum as it will draw soap solution into the instrument and contaminate it. Do not
exceed 15 psi pressure.
•
If the instrument has the zero and span valve option, the normally closed ports on
each valve should also be separately checked. Connect the leak checker to the
normally closed ports and check with soap bubble solution.
•
Once the leak has been located and repaired, the leak-down rate of the indicated
pressure should be less than 1 in-Hg-A (0.4 psi) in 5 minutes after the pressure is
turned off.
•
Clean surfaces from soap solution, re-connect the sample and pump lines and
replace the instrument cover. Restart the analyzer.
Use a separate, calibrated flow meter capable of measuring flows between 0 and
1000 cm³/min to measure the gas flow rate though the analyzer. Do not use the
built in flow measurement viewable from the front panel of the instrument. This
value is only calculated, not measured
Sample flow checks are useful for monitoring the actual flow of the instrument, as the
front panel display shows only a calculated value. A decreasing, actual sample flow
may point to slowly clogging pneumatic paths, most likely critical flow orifices or
sintered filters. To perform a sample flow check:
•
Disconnect the sample inlet tubing from the rear panel SAMPLE port shown in
Figure 3-4.
•
Attach the outlet port of a flow meter to the sample inlet port on the rear panel.
Ensure that the inlet to the flow meter is at atmospheric pressure.
• The sample flow measured with the external flow meter should be within ± 10% of
the nominal values shown in Table 8-3.
•
Low flows indicate blockage somewhere in the pneumatic pathway.
The T-Series digital electronic systems will operate with any of the specified power
regimes. As long as instrument is connected to 100-120 VAC or 220-240 VAC at either
50 or 60 Hz it will turn on and after about 30 seconds show a front panel display.
Internally, the status LEDs located on the Relay PCA, Motherboard and CPU should
turn on as soon as the power is supplied.
On the other hand, some of the analyzer's non-digital components, such as the pump and
the various AC powered heaters must be properly configured for the type of power being
Teledyne API - Model T200H/T200M Operation Manual
07270D DCN7141