Teledyne 760 PLUS instruction manual Pressure Measurements, Auxiliary Relay Contacts

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.

1000.0				5.0
100.0				0.5
INDICATED				OUTPUT
PRESSURE
				VOLTS
(TORR)
10.0				0.05
1.0				0.005
0.1				0.0005
0.10	1.00	10.00	100.00	1000.00

PRESSURE (TORR)

Manual: 147-082010_HPM-760-Plus-Vacuum-Gauge Page 11 of 16