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D U N I W A Y
S T O C K R O O M
C O R P .
Instruction Manual
Terranova
Model 908A Dual Capacitance Diaphragm
Gauge Controller
Copyright © 2000 by Duniway Stockroom Corp.
rev100410sr
1 of 29
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 DUNIWAY Stockroom Terranova 908A
- Page 1 S T O C K R O O M C O R P . Instruction Manual Terranova Model 908A Dual Capacitance Diaphragm Gauge Controller Copyright © 2000 by Duniway Stockroom Corp. rev100410sr 1 of 29 TELEPHONE: 650-969-8811 TOLL-FREE (U.S. only): 800-446-8811 FAX: 650-965-0764 EMAIL: info@duniway.com...
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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 . Table of Contents Safety Information page 4 Overview page 5 A. Front View, Back View and Dimensions B. General Description C. - Page 3 D U N I W A Y S T O C K R O O M C O R P . Maintenance page 25 A. Changing Fuses B. Schematic Diagrams Trouble Shooting page 26 Return Procedure page 27 VIII Warranty page 28 List of Figures Figure 1:...
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Page 4: I Safety Information
D U N I W A Y S T O C K R O O M C O R P . I Safety Information Explosive Gases WARNING! Do not use the Model 908A Dual Capacitance Diaphragm Gauge Con- troller to measure the pressure of combustible gas mixtures. The gauge normally operates at low temperatures, but it is possible that momen- tary transients or controller malfunction may cause ignition of combus- tible mixtures, which then might explode and cause damage to... -
Page 5: Overview
D U N I W A Y S T O C K R O O M C O R P . Overview A. Front View, Back View and Dimensions Figure 1: Model 908A front view Figure 2: Model 908A rear view Figure 3: Model 908A dimensions 5 of 29 TELEPHONE: 650-969-8811... -
Page 6: General Description
D U N I W A Y S T O C K R O O M C O R P . B. General Description The Terranova Scientific Model 908A Dual Capacitance Diaphragm Gauge (CDG) Controller displays vacuum pressure as measured from capacitance diaphragm gauges. The 908A supplies ±15 volts at up to 0.75 amp;... -
Page 7: Controls And Indicators
D U N I W A Y S T O C K R O O M C O R P . 10. Operating Temperature Range +2 to +50 deg. Celsius 11. Process Control Set Points two, with independent High and Low set points for each relay, for flexible control of hysteresis 12. -
Page 8: Capacitance Diaphragm Gauge Suppliers
, 10 mm high 5. Display Indicators bright red individual for miscellaneous indicators E. Capacitance Diaphragm Gauge Suppliers CDGs may be ordered from several sources, including the following: Duniway Stockroom Corp. 1305 Space Park Way Mountain View, California 94043 telephone (650) 969-8811 toll-free... -
Page 9: Installation
• D-sub 15 accessory connector • this instruction manual If your controller does not have all of these items, call Duniway Stockroom. If anything appears to have been damaged in shipment, contact the shipper. If you need a gauge cable for connection to the Model 908A, please contact Duniway Stockroom. -
Page 10: Connect The Cdg
D U N I W A Y S T O C K R O O M C O R P . D. Connect the CDG Make sure that the CDG is securely connected to the vacuum system, using good vacuum practice. -
Page 11: Figure 6: Mks Baratron Pin Connections (5 Pin)
D U N I W A Y S T O C K R O O M C O R P . Note: Many other manufacturer’s gauge pin connections use this same pin configuration. 908A 9-pin ‘D’ to MKS Baratron 5-pin Molex 908A Pin Terranova Name Color... -
Page 12: Make Accessory Connections
D U N I W A Y S T O C K R O O M C O R P . F. Make Accessory Connections The 15-pin D-sub Accessory Connector is on the rear panel of the 908A, see Figure 8, below. The connector has female pins;... -
Page 13: Operation
D U N I W A Y S T O C K R O O M C O R P . Operation A. Turn Power On Plug the AC power end of the power cord into an electrical outlet. The loudspeaker will “beep” and test all indicators while the controller executes its self test. -
Page 14: Set Pt 1 Low
D U N I W A Y S T O C K R O O M C O R P . D. Set Pt 1 low Default Value: OFF This sets the low limit of the set point. This is the pressure at which the set point relay will be energized. -
Page 15: Calibrate
D U N I W A Y S T O C K R O O M C O R P . H. Calibrate Default Value: 1.00 (Internal value) This allows the user to modify the reading for either gauge by multiplying by a value between 0.500 and 2.000. -
Page 16: Zero
D U N I W A Y S T O C K R O O M C O R P . J. Zero Default Value: 0.0 (internal value) This allows the user to adjust the zero for each CDG. Before making this adjustment, the CDG should be connected to a vacuum system at a pressure lower than 0.01% of the full scale for the CDG. -
Page 17: Set Point Operation
D U N I W A Y S T O C K R O O M C O R P . L. Set Point Operation When pressure values have been entered for a set point (1 or 2) and assigned to a gauge (1 or 2), the set point relay operates as follows: As the pressure on the assigned gauge falls through the chosen “Set Point N Low”... -
Page 18: Figure 11: Choosing Components/Set-Point Circuits
D U N I W A Y S T O C K R O O M C O R P . Figure 11: Choosing Component Values for Set-Point Protective Circuits 18 of 29 TELEPHONE: 650-969-8811 TOLL-FREE (U.S. only): 800-446-8811 FAX: 650-965-0764 EMAIL: info@duniway.com www.duniway.com... -
Page 19: Reading Pressure
D U N I W A Y S T O C K R O O M C O R P . M. Reading Pressure Pressure display and ranging are automatic in the 908A. Most readings will take place between zero pressure and the full scale of the 908A. The following table will help explain operation: Sensor 908A 908A... -
Page 20: Figure 13: Analog Output And Displayed Pressure
D U N I W A Y S T O C K R O O M C O R P . Displayed pressure Analog Output - volts 0.00 0 mTorr (µBar) or less 0.00 0.016 mTorr (µBar) 0.10 0.10 mTorr (µBar) 0.50 0.20 mTorr (µBar) 0.65... -
Page 21: Serial Interface
The serial port allows reading pressure and other parameters of the 908A; it is not possible to modify stored parameters over the serial port. Figure 14: Serial Interface Cables from PC to Terranova 908A The following commands are used in the 908A: 1. -
Page 22: Figure 15: Serial Output And Displayed Pressure
D U N I W A Y S T O C K R O O M C O R P . Displayed Pressure Serial Output 0.000 mTorr 0.000e-3 0.800 mTorr 0.800e-3 2.800 mTorr 2.800e-3 -1.600 mTorr -1.600e-3 57.10 mTorr 57.10e-3 2.340 torr 2.340e+0 105.0 torr... - Page 23 D U N I W A Y S T O C K R O O M C O R P . 3. Units Of Measurement To read the chosen units of measure (both gauges), Send “u” (ASCII value 117); the 908A returns Torr mBar Pascal...
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Page 24: Pascal/Kpascal Pressure Units Only Set-Up (-J Mode)
P. Pascal/kPascal Pressure Units Only Set-Up (-J Mode) The Terranova 908A has a special -J Mode, where only Pascal/kPascal units are available for dis- play. In this mode, during the SELECT process, the UNITS will not permit changing to Torr/ mTorr or mBar/microBar. -
Page 25: Changing Fuses
D U N I W A Y S T O C K R O O M C O R P . Maintenance A. Changing Fuses The controller contains two fuses. Both fuses are held in the fuse assembly that is part of the pow- er module located on the back panel of the controller. -
Page 26: Trouble Shooting
Fuses: If fuses burn out, check to see that the proper voltage has been supplied to the power input module. If fuses burn out repeatedly call Duniway Stockroom. Display Shows -LO, OFF or HI: If the digital display consistently shows -LO, OFF or HI, it may be that one of the internal power supply protection devices has removed power to the CDG. -
Page 27: Return Procedure
-- Use the original packaging if it is available. -- If the Terranova 908A was shipped with a cable and/or CDG sensor, diagnosis and repair will be more efficient if all components are returned together. If this is not convenient,... - Page 28 VIII 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. At our option, we will repair or replace products which prove to be defective during the war- ranty period.
- Page 29 S T O C K R O O M C O R P . DECLARATION OF CONFORMITY We, Duniway Stockroom Corp., declare under our sole responsibility, that the following products, displaying the CE mark on the rear panel: Model 908A Dual Capacitance Diaphragm Gauge Controller...
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