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HFM-E-200/HFC-E-202
Page 8 of 30
suggested that all connections be checked for leaks after installation. This can be done by pressurizing
the instrument (do not exceed 500 psig unless the Flowmeter is specifically rated for higher pressures)
and applying a diluted soap solution to the flow connections rated for higher pressures) and applying a
diluted soap solution to the flow connections.
2.5. Electrical Connections
If a power supply from Hastings Instruments is used, installation consists of connecting the HFM-E-
200/HFC-E-202 series cable from the “D” connector on the rear of the power supply to the “Edge”
connector on the top of the Flowmeter. If a different power supply is used, follow the instructions
below when connecting the flow meter.
This HFM-E-200/HFC-E-202 series requires Hastings cable #65-854. Use of any other cable can severely
damage the instrument and void the warranty. Figure 2.1 shows the schematic layout for connecting the
instrument to an appropriate power supply.
The power supply used must be capable of supplying +15VDC at 50mA and -15VDC at -200mA for each
controller. These voltages must be referenced to a circuit Common terminal. Connect -15VDC to pin F
and +15VDC to pin 4.
Pins 2, B and C are all Commons and they are connected together internally with solder jumpers to
ensure compatibility with legacy flow controllers. At least one of these Common pins must be connected
to the Common pin on the power supply. However for new designs and for installations with long cable
runs between the transducer and the power supply it is recommended that pin C be isolated from the
other Common pins of the transducer and provided a separate wire to connect it to the power supply
Common.
This pin carries the valve current and under conditions when the impedance of the wire connecting the
transducer Common to the power supply Common is high, tying these Commons together at the
transducer can create cross-talk that may result in flow instabilities or errors in the Command signal or
the Flow Output signal. In order to isolate pin C, solder jumpers JP8 and JP10 must be unsoldered while
JP7 remains soldered. This will be performed at assembly time in the factory if there is an indication at
the time of order that this is desired or it can be performed in the field. The Common pins can be
reconfigured to put the valve return current on different pins. Consult factory if it is necessary to match
previously installed wiring.
Figure 2.1