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Omega FMA 4000 User Manual: Maintenance; Introduction

Digital mass flow meters.
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Analog output signals of 0-5 Vdc and 4-20 mA are attained at the appropriate pins of
the 15-pin "D" connector (see Figure b-1) on the side of the FMA 4000 transducer.
ANALOG SIGNAL
OUTPUT
Flow Rate Output
Jumper Header J7
See APPENDIX IV for actual jumpers layout on the PCB.
Note: Digital output (communication) is simultaneously available with
analog output.
6.

MAINTENANCE

6.1

Introduction

It is important that the Mass Flow Meter is only used with clean, filtered gases.
Liquids may not be metered. Since the RTD sensor consists, in part, of a small
capillary stainless steel tube, it is prone to occlusion due to impediments or gas
crystallization. Other flow passages are also easily obstructed.
Therefore, great care must be exercised to avoid the introduction of any potential
flow impediment. To protect the instrument, a 50 micron (FMA 4000) filter is built
into the inlet of the flow transducer. The filter screen and the flow paths may require
occasional cleaning as described below. There is no other recommended mainte-
nance required. It is good practice, however, to keep the meter away from vibra-
tion, hot or corrosive environments and excessive RF or magnetic interference.
If periodic calibrations are required, they should be performed by qualified per-
sonnel and calibrating instruments, as described in section 7. It is recommended
that units are returned to Omega
CAUTION: TO PROTECT SERVICING PERSONNEL IT IS
MANDATORY THAT ANY INSTRUMENT BEING SERVICED IS
COMPLETELY PURGED AND NEUTRALIZED OF TOXIC,
BACTERIOLOGICALLY INFECTED, CORROSIVE OR RADIOACTIVE
CONTENTS.
Table VI Analog Output Jumper Configuration
0-5 Vdc
J7.A
J7.B
J7.C
®
5-9
6-10
7-11
for repair service and calibration.
18
4-20 mA
J7.A
1-5
J7.B
2-6
J7.C
3-7

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