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HVG-2020B Instruction Manual
1. General Information
The HVG-2020B is a small, low-cost electronics module which combines the outputs of a Pirani sensor and a
piezo-resistive sensor to provide the user with accurate vacuum measurements over the range of 1×10
1000 Torr. The piezo-resistive sensor produces an absolute pressure signal output that is proportional to
pressure and independent of gas composition. The hot-wire Pirani sensor produces an absolute pressure signal
dependent on the thermal conductivity of the surrounding gas remaining in the vacuum system.
The HVG-2020B is designed for quick, easy installation and will provide the user with long lasting, trouble free,
reliable vacuum measurement. The electronics can be powered by a power supply capable of delivering any
voltage between 12 VDC to 36 VDC.
The HVG-2020B instrument has a modular PCB design that allows for flexibility in available features and options
for OEM applications. This includes analog output via a 9-pin D connector, additional 4 conductor 3.5 mm TRRS
jack and USB virtual COM port for digital communication. The HVG-2020B VISION offers an additional color
touch-panel display.
The two sensors exhibit excellent stability, and their outputs are characterized and digitally linearized to
provide superior accuracy. The pressure signal is made available on the digital port and display. The signal is
also converted to the desired analog signal (linear/logarithmic, voltage/current) and this signal is presented to
the D connector.
Hastings vacuum instruments do not require any periodic maintenance under normal operating conditions with
clean gases. No damage will occur from the use of moderate overpressures (< 25 psig).
The following sections contain the steps needed to get a new vacuum gauge operating as quickly and easily as
possible. Please read the following thoroughly before attempting to install the instrument.
NOTICE: The instruments described in this manual may be available with multiple pinouts.
Ensure that all electrical connections are correct.
NOTICE: The instruments described in this manual are designed for INDOOR use only.
NOTICE: The instruments described in this manual are designed for Class 2 installations in
accordance with IPC standards.
CAUTION: There are no operator serviceable parts or adjustments inside the product.
CAUTION: If this equipment is used in a manner other than that specified, the protection
provided by the equipment may be impaired.
EAR99 Technology Subject to Restrictions Contained on the Cover Page
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