5. OPERATING INSTRUCTIONS
5.1 Preparation and Warm Up
It is assumed that the Mass Flow Controller has been correctly installed and thor-
oughly leak tested as described in section (2). Shut the flow source OFF. Apply
power to the unit via the 15-pin “D” connector. Before connecting the power sup-
ply check the controller power supply requirements label located on the controller
back cover. If the power supply requirements label states that power supply
requirement is 12 Vdc, do not connect the power supply with voltage above 15
Vdc. Exceeding the specified maximum power supply voltage limit will result in
device permanent damage. Allow the Mass Flow Controller to warm-up for at
least 15 minutes.
During initial powering of the FMA 5400A/5500A transducer, the flow output sig-
nal will be indicating a higher than usual output. This is indication that the FMA
5400A/5500A transducer has not yet attained it's minimum operating tempera-
ture. This condition will automatically cancel within a few minutes and the trans-
ducer should eventually zero.
If after the 15 minutes warm-up period, the display still indicates a reading of less
than ± 3.0 % of F.S., readjust the ZERO potentiometer [R34] through the access
window. Before zero adjustment to temporarily disconnect the gas source, to
ensure that no seepage or leak occurs in to the meter.
11
TABLE I PRESSURE DROPS
MAXIMUM FLOW
RATE SERIES
FLOW RATE
[liters/min]
MAXIMUM PRESSURE DROP
[mm H
2
O]
[psid]
[mbar]
10 L/min up to 10 720 1.06 75
50 L/min
15 2630 3.87 266
20 1360 2.00 138
30 2380 3.50 241
40 3740 5.50 379
50 5440 8.00 551
100 L/min
60 7480 11.00 758
100 12850 18.89 1302
200 L/min 200 7031 10.00 690
500 L/min 500 8437 12.00 827
1000 L/min 1000 10547 15.00 1034
CAUTION: Adjusting Zero Reading more than ± 3.0% F.S. from the
factory settings may affect device calibration accuracy. If such adjustment
is required it is recommended to perform controller recalibration to pre
serve device accuracy.
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