Ametek 5000 Instrument Manual page 41

3. Verify that the pressure reducer at sample tap 1 is closed. Open the process sample line
valve at sample tap 1. Adjust the pressure reducer to a nominal 520 kPa (75 psi) gauge.
Repeat for all other sample taps. Note that minimum pressure to the field unit is 200 kPa
gauge (30 psig) and maximum is 670 kPa gauge (100 psig). If a separate reference gas is
used, open the reference source and set the pressure to the same value as the sample.
4. Slowly open the reference gas flow control valve (2) and adjust flow to midscale on the
flowmeter (5). Note that the flowmeter will read flow only every other cycle; this is because
the flowmeter reads flow through the cell and there is no flow for half the cycle at this time.
Bottom line of the controller display will read "Reference Flowing". Note that sample point
1 is the recommended source for sample reference gas.
5. When the point 1 sample cycle begins (display will read "Sample Flowing"), slowly adjust
the sample gas flow valve (1) for midscale on the flowmeter (5). Note that with the sample
gas flowing, the back pressure should remain the same as the value noted in step 2 above.
Adjust back pressure if necessary.
Monitor flows for sample points 2, 3, and 4. If flows are not correct after setting sample
point 1, adjust the inlet pressure for each sample point to compensate for the flow differ-
ences. By default, samples are automatically switched in numerical order approximately
every four minutes.
6. Press the Calib key on the controller. Press the down arrow key until "Flow Moisture Gen" is
selected. Press Enter and enter password when prompted to begin the calibration (reference/
moisture generator) cycle. Adjust the moisture generator flow control (3) for midscale on the
flowmeter (5). Flow does not have to be set accurately at this time, but sample, reference,
and moisture generator gases must all be flowing. Note that with moisture generator gas
flowing, the back pressure should remain the same as the value noted in step 2 above. Press
Cancel to end moisture generator flow and return to normal (reference/sample) operation.
7. When the verification and subsequent equilibration cycles are finished, the analyzer will
return to normal operation starting with sample point 1. Verify that indicated flow rates
and back pressures for each point remain constant. Repeat step 6 to verify that flow rate
and back pressure do not change when moisture generator gas is flowing. Adjust the back
pressure (4) and flow rates (1,2,3) until they are stable regardless of which gas is flowing.
8. Operate the system under those conditions, for drydown. Continue until cell frequency
is within ~200Hz of the dry cell frequency. The dry cell frequency is variable #46 on the
configuration sheet. To monitor cell frequency, program one of the display flags to 03. Refer
toPage 4-2: Display Flags.
Allow system at least 24 hours to drydown on dry gas. Depending on the process
and the sample system configuration, drydown may take longer.

NOTE

NOTE
!
WARNING
Flow Rate and Back Pressure Fine Adjustment
If a separate reference gas is used, this flow adjustment must be done on both gases,
one at a time.
Line voltage up to 253V may be present in the field unit.
Operation 3-7