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201/203/205/207 Series Flowmeters and Controllers Instruction Manual
the Flowmeter is specifically rated for higher pressures), applying a diluted soap solution to the flow
connections, and monitoring the connections for bubbles of escaping gas.
Electrical Connections
If a power supply from Hastings Instruments is used with a ±15 Volt version of the HFM-201/205, HFC-
203/207, installation consists of connecting the appropriate cable (#AF-8AM) from the "D"
connector on the rear of the power supply to the "D" connector on the top of the flow instrument. If a
different power supply is used, use the following instructions when connecting the flowmeter or controller.
WARNING: Care must be taken to avoid any high voltages that may be present when dealing
with power supplies. To prevent the spread of fires in the event of a fault, only use power
supplies power limited to no more than 150 VA. Hastings power supplies meet this
requirement. The available current for each 200 series instrument connected to a power
supply should not exceed 1.6 A.
2.5.1.
Bipolar (±15 VDC) Power Supply to Bipolar Connections
Connecting the HFM-201/205, HFC-203/207 series flow instruments with anything other than the prescribed
cables and power supplies discussed above, can severely damage the instrument and void the warranty. The
figure below shows the schematic layout for connecting the instrument to an appropriate ±15 Volt power
supply. A pinout is also given to show the signals available to the user and the signals given and used by the
power supply (Not all signals from the pcb are used by Hastings supplies).
The power supply used must be meet the power requirements delineated in the specifications. If a bipolar
supply is required, the voltages must be referenced to a common ground. Connect -15 VDC to pin 9 of the
DA-15 connector and +15 VDC to pin 11. Pins 5 and 12 are both commons and they must be connected
together and to the ground connection at the power supply. Do not connect them together at the flow
controller as the resulting crosstalk could result in flow instabilities.
EAR99 Technology Subject to Restrictions Contained on the Cover Page
Pin #
PCB Signal
1
Option 1
2
Valve Control
Thermocouple
3
Downstream
Thermocouple
4
Upstream
5
Signal Common
Signal Output
6
(0-5V or 4-
20mA)
7
Case Ground
Control Valve
8
Override
9
-15 VDC
10
Option 10
11
+15 VDC
12
Valve Return
13
External Input
Set Point (0-5V
14
or 4-20mA)
15
5V Reference
Hastings Power
Supply
Not used
Signal Common
Signal Output
(0-5V or 4-
20mA)
Case Ground
Control Valve
Override
-15 VDC
Not used
+15 VDC
Valve Return
Not used
Set Point (0-5V
or 4-20mA)
Not used
Page 13 of 28
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