Aalborg GFC Bedienungsanleitung PDF herunterladen (Seite 13)

GFC 17/37/47 CAUTION

CAUTION: If the valve is left in the AUTO (control) or OPEN (PURGE)

mode for an extended period of time, it may become warm or even hot

to the touch. Use care in avoiding direct contact with the valve during

operation.

Do not run GFC 17/37/47 models for extended periods of time with the valve in

AUTO or PURGE mode without the flow of gas through the transducer. Doing so

may result in up to 2% f.s. shift in calibration.



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. Use a power supply that is between

+12 and +15 VDC with at least 800 mA current capacity (or optionally, for models

GFC17/37/47 only, +24 VDC 650 mA). Allow the Mass Flow Controller to warm-

up for at least 15 minutes.

During initial powering of the GFC transducer, the flow output signal will be indi-

cating a higher than usual output. This is indication that the GFC transducer has

not yet attained its minimum operating temperature. This condition will automat-

ically cancel within a few minutes and the transducer 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 temporarily disconnect the gas source, to ensure

that no seepage or leak occurs in to the meter.

TABLE IV PRESSURE DROPS

MODEL

FLOW RATE

[liters/min]

MAXIMUM PRESSURE DROP

[mm H

[psid] [mbar]

GFC 17 UP to 10 720 1.06 75

GFC 37

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

GFC 47

60 7480 11.00 758

100 12850 18.89 1302

GFC 57 200 7031 10.00 690

GFC 67 500 8437 12.00 827

GFC 77 1000 10547 15.00 1034

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 39 40

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