Teledyne Hastings Instruments 24 VDC Switching Power Supply for HVG-2020B Vacuum Gauge, US AC Input.

This Teledyne Hastings Instruments is a 24 VDC switching power supply for HVG-2020B Vacuum Gauges with optional touchscreen display. The gauges features two sensors, a piezo-based transducer and a thermalbased Pirani sensor, in a single, small package. The piezo is used at higher pressures, above 20 Torr, to accurately measure pressures. This sensor is media-isolated and is also gas composition independent. The Pirani sensor is a precision welded hot-wire thermal sensor that measures pressures below 1 Torr. An ambient thermal sensor enables the instrument to make adjustments for temperature which in turn enables better accuracy throughout the pressure range of the instrument (0.1 mTorr to 1000 Torr). Between 1 and 20 Torr, a weighted average between the two sensors is used to determine the pressure. The HVG-2020B also features cross-calibration. In short, the low pressure Pirani is able to periodically zero the piezo sensor which gives the user superior accuracy performance.

The HVG-2020B is easy to install, and the optional display provides the user with several different views, or modes of operation. The "Pressure versus Time" mode allows the user to monitor the pumpdown (or vent) of their vacuum system. In this mode, it can be possible to identify problems early and save time. Rate-of-rise can be viewed and may help to identify the presence of a chamber leak. For users who want another method to see system pressure changes, we provide the "Bar Graph" Mode. As the pressure changes, the user can view both the numeric value of the pressure in the system as well as the rate of change by viewing the position of the bar.

The HVG-2020B is very flexible and can provide both analog and digital output to easily integrate into process control. A wide variety of analog output signals may be selected (0-1 VDC, 0-5 VDC, 0-10 VDC, 0-20 mA, and 4-20 mA). This makes the HVG-2020B an excellent choice to replace more expensive capacitance manometers. Digital output can include RS232 and RS485 via a small jack on the top of the instrument. A USB connection is also available which makes connection and operation very easy. Free data acquisition software for data logging is available for the HVG-2020B.

The THCD-101 and all of it's advanced features, including its internal webserver, is now available for the HVG-2020B! The vacuum gauge will have the standard option for logarithmic output of 1V / Decade (2 - 9 VDC). The THCD-101-LOG powers the HVG-2020B and then receives the output signal proportional to the range of the HVG-2020B. Then the output is converted to a pressure reading on the screen in Scientific Notation with Torr units. It also has two built in relays that can be used to control the upper and lower limits of the vacuum level. The remote display is able to be panel mounted or placed on a benchtop while the HVG-2020B may be installed anywhere, including difficult to reach locations.