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The HVG-2020A can come with any of several vacuum connections, including: 1/8" NPT, ¼ VCR, ½" VCR, KF-
16, KF-25, 1.33" CF, 2.75" CF and ½" smooth stub tube. The tube is configured with the vacuum fitting
requested.
NOTICE: When installing the 1/8" NPT version, be certain to use the ½" wrench flats. Do not tighten
using the aluminum housing as a grip or damage may result.
WARNING: Do not exceed the pressure rating of the instrument. If operating near the maximum
operating pressure, ensure there is a pressure relief valve in the system.
Electrical Connections
WARNING: Care must be taken to avoid any high voltages that may be present when dealing
with power supplies.
2.3.1. Connector
The HVG-2020A 9 pin "D" connector pin assignments are listed here.
2.3.2. Power Input
The HVG-2020A has its own internal switching power supply and requires
between 12 and 36 VDC input voltage. The +VDC supply is pin 3 and the –
VDC return is pin 4. Case ground is pin 6.
NOTICE: Either the base or pin 6 must be connected to ground for proper noise immunity and to meet
CE Mark standards.
There is also a 2mm barrel connector available as a 24 VDC power jack. The center pin polarity is positive and
is internally connected to pin 3 of the "D" connector. The sleeve is internally connected to pin 4 of the "D"
connector.
The gauge requires a maximum of 2 watts for proper operation. Surge suppressors are recommended to prevent
power spikes reaching the instrument. Hastings power supplies satisfy these power requirements.
2.3.3. Analog Output
The analog signal output is configurable via digital communications. See the instrument label to determine how
the instrument was configured at the factory. In Hastings power supplies, the analog output is routed to the
display and is also available at terminals on the rear panel. If a Hastings supply is not used, the output is
available on pin 5 of the "D" connector.
The standard output of the pressure meter is a 0-10 VDC signal proportional to the pressure. Analog output
voltage is available on pin 5 and referenced to analog common on pin 8. The voltage output may be set to 1, 5
or 10 volts full scale. The standard value is 10 volts and will have been set as such unless another value was
specified at time of order. The analog full-scale settings can be changed in the field with digital commands.
HVG-2020A Instruction Manual
Pin #
1
High Setpoint
2
Low Setpoint
3
+ Power (12-36 VDC)
4
Power/Digital Common
5
Analog Output
6
Case Ground
7
Tx out (TTL)
8
Analog Common
9
Rx in (TTL)
Page 10 of 29
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