Terranova Scientific 921 Instruction Manual
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Terranova Scientific 921 Instruction Manual

Cold cathode gauge controller for use with hps inverted magnetron vacuum gauges
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D U N I W A Y
S T O C K R O O M
C O R P .
W W W . D U N I W A Y . C O M
Instruction Manual
Terranova Scientific Model 921
Cold Cathode Gauge Controller
for use with HPS Inverted Magnetron Vacuum Gauges
Copyright © 1998 by Terranova Scientific, Inc.
All rights reserved, including the right of reproduction in whole or part in any form, without
permission in writing from Terranova Scientific, Inc.
1 of 22
TELEPHONE: 650-969-8811
TOLL-FREE (U.S. only): 800-446-8811
FAX: 650-965-0764
EMAIL: info@duniway.com
www.duniway.com

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Summary of Contents for Terranova Scientific 921

  • Page 1 Cold Cathode Gauge Controller for use with HPS Inverted Magnetron Vacuum Gauges Copyright © 1998 by Terranova Scientific, Inc. All rights reserved, including the right of reproduction in whole or part in any form, without permission in writing from Terranova Scientific, Inc.

  • Page 2: Table Of Contents

    D U N I W A Y S T O C K R O O M C O R P . W W W . D U N I W A Y . C O M Table of Contents Overview page 7 A.
  • Page 3 Figure 1: Model 921 Front Panel page 5 Figure 2: Model 921 Rear Panel page 5 Figure 3: Model 921 Rear Panel, CE Model page 6 Figure 4: Model 921 Dimensions page 6 Table 1: Accessory Connector Pin Assignments page 11...
  • Page 4 Combustible Gases WARNING! Do not use the Terranova 921 Cold Cathode Gauge Controller / Display to measure the pressure of combustible gas mixtures. The gauge operates with an ionized gas discharge, and it is possible that this discharge may cause ig- nition of combustible mixtures, which then might explode and cause dam- age to equipment and injury to personnel.

  • Page 5: Figure 1: Model 921 Front Panel

    S T O C K R O O M C O R P . W W W . D U N I W A Y . C O M Figure 1: Model 921 Front Panel ser. no. Figure 2: Model 921 Rear Panel...

  • Page 6: Figure 3: Model 921 Rear Panel, Ce Model

    S T O C K R O O M C O R P . W W W . D U N I W A Y . C O M ser. no. Figure 3: Model 921 Rear Panel, CE Model 3.60 inch 1.85 inch 91.4 mm 1.78 inch...

  • Page 7: Overview

    The Terranova Scientific Model 921 Cold Cathode Gauge Controller displays vacuum pressure as measured from an HPS inverted magnetron gauge tube. It displays vacuum measurements based on ionization of the residual gas. The Model 921 controller covers the range from 3 x 10 Torr (mbar) to 10 Torr (mBar), and controls two relays with independent set points.
  • Page 8 13. Operating Voltage the Model 921 has a universal power supply, which operates on input voltages from 85 50/60 Hz; standard IEC 320 instrument power input receptacle on rear panel; replace- ment fuse type: 5 mm X 20 mm, regular 1 amp...

  • Page 9: Installation

    C. Select the Gauge Tube The Model 921 controller is designed to work with the HPS Inverted Magnetron gauge tube, se- ries 421 or I-Mag. See Specifications for availability of gauges. If you have difficulty obtaining a gauge, please contact us at Duniway Stockroom.

  • Page 10: Connect The Gauge Tube

    D15 Accessory Connector. See Table 1, below on page 11. G. Make Accessory Connections The 15-pin D-sub Accessory Connector is on the rear panel of the 921, see Table 1, below on page 11. The connector has female pins; the mating connector must have male pins. Mating D-sub 15 connectors are available from many of the normal electronic sources.
  • Page 11 5 Set Point #2 relay, common pin 6 Set Point #2 relay, normally open pin 7 Tx, RS-232 signal out of the 921, 9600-N-8-1 pin 8 Rx, RS-232 signal into the 921 pin 9 Ground, RS-232 and analog common...

  • Page 12: Operation

    Following the initial self-test, the display will show OFF. This indicates the high voltage for the anode has not been applied. B. Front Panel Controls The Model 921 allows flexible configuration of operation using simple entry from the front panel buttons labeled . Parameters which you may adjust are...
  • Page 13 For a system that is far out of calibration, the factory settings provide a good starting point for re-calibrating or adjusting the gauge controller. To recover the factory settings, unplug the 921 from its power source. Press and hold buttons at the same time;...

  • Page 14: Analog Output

    Pressure display and ranging are automatic in the 921. Most readings will take place between zero pressure and the full scale of the 921. For pressure lower than the minimum capability of the 921, the display will show -LO. For pressure greater than the maximum full scale of the 921, the dis- play will show HI.

  • Page 15: Serial Interface

    8 is Rx (signal from the terminal to the 921) pin 9 is return (ground). The serial port allows reading pressure and other parameters of the 921; it is not possible to mod- ify stored parameters over the serial port.
  • Page 16 Set Point #2 To read the setting and status of set point #2 Send “2” (ASCII value 50); the 921 returns information for set point #2 in the same format as for set point #1, above. Model and Software Revision To read software identification.

  • Page 17: Maintenance

    To change fuses, unplug the line cord from the power entry module at the rear of the 921; locate the fuse block immediately below the line cord socket. Press the tab of the fuse assembly and withdraw the fuse assembly from the power module.
  • Page 18 D U N I W A Y S T O C K R O O M C O R P . W W W . D U N I W A Y . C O M Troubleshooting If the self-test fails, run the self-test again by turning the power off and then on again. If it fails again, call Duniway Stockroom.

  • Page 19: Return Procedure

    D U N I W A Y S T O C K R O O M C O R P . W W W . D U N I W A Y . C O M Return Procedure If you need to return the gauge controller for service, first contact Duniway Stockroom to get au- thorization.
  • Page 20 D U N I W A Y S T O C K R O O M C O R P . W W W . D U N I W A Y . C O M Warranty Terranova products of Duniway Stockroom Corp. are warranted to be free of defects in material and workmanship for a period of one year from the date of shipment.
  • Page 21 CE mark on the rear panel: Model 906 Convection Gauge Controller Model 908 Dual Capacitance Diaphragm Gauge Controller Model 921 Cold Cathode Gauge Controller Model 924 Thermocouple Vacuum Gauge Model 926 Dual Convection Gauge Controller...

  • Page 22: Application Alert

    Recovery: Recovery from either of these situations is simple: Turn off the high voltage on the 921 con- trol unit. The unit will function normally when the correct operating pressure range is achieved.

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