10/4/2007 phone: (215) 947-2500 fax: (215) 947-7464 e-mail: sales@televac.com web site: www.televac.com
5
CHAPTER 4
TELEVAC
SENSOR OPERATION AND INSTALLATION
1.0
Connect the gauge to the vacuum system.
NOTE: DO NOT TURN INSTRUMENTATION WHEN MOUNTING ON A THREADED INSTALLATION
TO INSTALL, USE A WRENCH ON THE FLATTED PORTION OF THE SENSOR TUBE
2.0
Assure that there are no leaks.
3.0
Apply 24 DC volt power between pin # 3 (+) and pin # 4 (-) of the connector cable.
4.0
Configure output lines; pin # 5 (for linear 1 output), pin # 8 (signal gnd) and pin # 7 (for non linear
output). The table of voltage versus pressure is shown in chapter # 5. The linear signal output is
10 volts at 1000 microns and decreases linearly to zero at zero microns. The non-linear signal
output is 10 volts at zero pressure and decreases non-linearly to 1.25 volts at 1000 microns.
5.0
Pump down the vacuum system while observing the LED display and the signal voltage reading
on the output. (see chapter # 5 for output values)
6.0
While the pressure is above 20 Torr the display will show “HI” and the signal output will
correspond to values given in chapter # 5, depending upon chosen output. As the pressure drops
below 1 Torr the red “MICRONS” LED lights and the displayed readings now drop from 990 down
to zero while the linear output voltage drops correspondingly from 9.90 Volts to zero.
7.0
The trip pressure for the setpoint relay can be displayed by pressing the “setpoint display” button
on the front panel of the instrument or by reading the Set Point voltage at pin # 9 of the cable
connector. The display will blink the reading until the button is pushed again or until it times out
automatically after 60 seconds. If the Set Point adjustment screw is turned to change the setting
the new value displayed will be retained in memory. The setpoint adjustment range is 0 to 20,000
microns. The relay contact connections are as follows; to the common # 6, # 1, normally open,
and # 2, normally closed.
8.0
If the display shows “-1” or “LO” then the gauge is out of adjustment. With a known vacuum of at
least 1 X 10-5 Torr, adjust the “Zero” adjustment screw on the front panel.
SEE NEXT PAGE FOR GAUGE DIAGRAMS
SUNSTAR传感与控制 http://www.sensor-ic.com/ TEL:0755-83376549 FAX:0755-83376182 E-MAIL:szss20@163.com
SUNSTAR传感与控制 http://www.sensor-ic.com/ TEL:0755-83376549 FAX:0755-83376182 E-MAIL:szss20@163.com
