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Manual: 147-082010_HPM-760-Plus-Vacuum-Gauge Page 11 of 16
Auxiliary Relay Contacts
The THPS-760 Power Supply has SP1 and SP2 relays for various external switching/monitoring
applications. Each relay has a single set of Form “C” contacts. (Choice of normally open or normally
closed contacts). The relays will energize (pick up) when the input is less than the preset set points as
adjusted in the Set Point Adjustment procedures above. The set point LED Indicators (SP1 or SP2) will
illuminate indicating that (SP1 or SP2) relay is energized. The choice of the normally open or normally
closed contacts will depend on the desired switching function of the particular application. Each set of
contacts is capable of switching up to 2 amps (max) @ 250 vac .
3.7. Pressure Measurements
The 760 Plus piezo transducers are shipped from the factory fully calibrated; thus, can provide
immediate and accurate pressure measurements as soon as the installation outlined in Section 2.2 has
been completed. If using a 760 Plus power supply/display, the pressure can be read directly in Torr units.
When not using a 760 Plus power supply/display, the linear output voltage or current depending on
option, must be interpolated to obtain absolute pressure measurements.
Figure 3-3 on the following page of this manual shows a typical signal output vs pressure curve. Note
the excellent linearity over 4-decades of pressure.
The Hastings 760 Plus power supply/display is calibrated at the factory prior to shipment and does not
require adjustment when installed. The user should not attempt to calibrate the Hastings 760 Plus power
supply/display; however, if the display indication is incorrect, calibrate the Hastings piezo transducer by
adjusting the ZERO and SPAN controls as outlined in this manual.
The Hastings transducer can be adjusted by performing the following procedure. If you intend to use
this procedure, you will need a vacuum system capable of achieving base pressures below 1.00E-02 Torr,
and a power supply/display which is calibrated for the option in use.
OUTPUT
VOLTS
0.1
1.0
10.0
100.0
1000.0
0.10 1.00 10.00 100.00 1000.00
PRESSURE (TORR)
INDICATED
PRESSURE
(TORR)
5.0
0.5
0.05
0.005
0.0005