DUNIWAY Stockroom Terranova 908A Instruction Manual

DUNIWAY STOCKROOM CORP.

TELEPHONE: [phone] TOLL-FREE (U.S. only): 800-446-8811 FAX: [phone] EMAIL: [e-mail]

www.duniway.com

Instruction Manual

Terranova

Model 908A Dual Capacitance Diaphragm

Gauge Controller

Copyright © 2000 by Duniway Stockroom Corp.

rev100410sr

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DUNIWAY STOCKROOM CORP.

TELEPHONE: [phone] TOLL-FREE (U.S. only): 800-446-8811 FAX: [phone] EMAIL: [e-mail]

www.duniway.com

Table of Contents

I Safety Information page 4

II Overview page 5

A. Front View, Back View and Dimensions
B. General Description
C. Specifications
D. Controls and Indicators
C. Capacitance Diaphragm Gauge Suppliers

III Installation page 9

A. Unpack the Controller
B. Mount the Controller
C. Select the CDG
D. Connect the CDG
E. Attach the CDG Cable
F. Make Accessory Connections
G. Check Supply Voltage
H. Attach the Power Cord

IV Operation page 13

A. Turn Power On
B. Front Panel Controls
C. Set Pt 1 High
D. Set Pt 1 low
E. Set Pt 2 High
F. Set Pt 2 Low
G. Units mTorr/Torr/kTorr -- Bar/mBar/microBar -- Pascal/kPascal -- Arb
H. Calibrate
I. Full Scale
J. Zero
K. Reset of Stored (Default) Values
L. Set Point Operation
M. Reading Pressure
N. Analog Output
O. Serial Interface
P. Pascal/kPascal Pressure Units Only Set-Up (-J Mode)

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DUNIWAY STOCKROOM CORP.

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V Maintenance page 25

A. Changing Fuses
B. Schematic Diagrams

VI Trouble Shooting page 26

VII Return Procedure page 27

VIII Warranty page 28

List of Figures

Figure 1: Model 908A front view page 5
Figure 2: Model 908A rear view page 5
Figure 3: Model 908A dimensions page 5
Figure 4: Sensor Connector -- 9 Pin Female D-Sub page 10
Figure 5: MKS Baratron Pin Connections (15 pin) page 10
Figure 6:
Figure 7.
Figure 8:
Figure 9:
Figure 10: Protective Ci

MKS Baratron Pin Connections (5 pin) page 11
MKS Baratron Pin Connections (9 pin ‘D’) page 11
Accessory Connector -- 15 Pin Female D-Sub page 12
Accessory Connector Signals and Pins

page 12

rcuits/Set Point Relays page 17
Figure 11: Choosing Components/Set-Point Circuits page 18
Figure 12 908A Ranges: Sensor, High, Low, Set Points page 19
Figure 13: Analog Output and

Displayed Pressure

page 20
Figure 14: Serial Interface Cables frim PC to 908A page 21
Figure 15: Serial Output and Displayed Pressure page 22
Figure 16: Serial Output and Full Scale Range Setting
Figure 17: Torr-Pascal Relationship - Terranova 908J
Figure 18: Error Codes p

page 22

page 24

age 26

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DUNIWAY STOCKROOM CORP.

TELEPHONE: [phone] TOLL-FREE (U.S. only): 800-446-8811 FAX: [phone] EMAIL: [e-mail]

www.duniway.com

I Safety Information

Explosive Gases

WARNING!
Do not use the Model 908A Dual Capacitance Diaphragm Gauge Con­troller to measure the pressure of combustible gas mixtures. The gauge
normally operates at low temperatures, but it is possible that momen­tary transients or controller malfunction may cause ignition of combus­tible mixtures, which then might explode and cause damage to
equipment and injury to personnel.

Limitation on use of Compression Mounts

WARNING!
Do not use a compression mount (quick-connect) for attaching the
gauge tube to the vacuum system in applications that may develop pos­itive pressures. Positive pressures may cause the tube to be blown out
of a compression fitting and damage equipment and injure personnel.

Chemicals

WARNING!
Many organic cleaning solvents, such as acetone, produce fumes that
are toxic or flammable. Use such solvents only in areas that are well
ventilated to the outdoors and away from electronic equipment, open
flames, or other potential ignition sources.

Please let us Know...

Terranova products are the most advance instruments of their type available
from any manufacturer. We have made this Instruction Manual as complete
and clear as possible. Let us know if you have any comments that can make
this manual or our products more useful.

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DUNIWAY STOCKROOM CORP.

TELEPHONE: [phone] TOLL-FREE (U.S. only): 800-446-8811 FAX: [phone] EMAIL: [e-mail]

www.duniway.com

A. Front View, Back View and Dimensions

Figure 1: Model 908A front view

II Overview

Figure 2: Model 908A rear view

Figure 3: Model 908A dimensions

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DUNIWAY STOCKROOM CORP.

TELEPHONE: [phone] TOLL-FREE (U.S. only): 800-446-8811 FAX: [phone] EMAIL: [e-mail]

www.duniway.com

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; this is sufficient to operate most heated capacitance diaphragm gaug­es. The 908A precisely measures the 0 to 10 volt signal from the CDG to determine pressure.
Model 908A controller covers full scale ranges from 20 mTorr to 10,000 Torr. The 908A is
housed in a 1/8 DIN enclosure and is simple to operate.

C. Specifications

1. Useful Measuring Range

4 decades; for CDG tubes with full scale of 20 mTorr to 10.00 ktorr; full scale range selection is
entered on the front panel by the user

2. Display Range

-9.9 torr to 10.00 ktorr; pressures higher than 130% of Sensor Full Scale displays HI;

The

3. Display Resolution

varies according to full scale range, from 0.01 mTorr to 1 Torr

4. Gauge Interface

The 908A incorporates a high-resolution input circuit which allows the use of the capacitance di­aphragm gauge over its entire 4 decades.

5. Input to the 908A Controller

0 to 10 volts for full scale of the gauge

6. Units of Display

torr (mtorr), mBar (Bar), pascal (kpascal), or arb (no units); user selectable

7. Full Scale

user selectable range to match CDG FULL SCALE : 20, 50, 100 mTorr; 1, 2, 10, 100, 1000, 5,000
and 10,000 torr

8. Calibration Adjust

for calibration of display; allows user to multiply CDG response by 0.50 to 2.00

9. Vacuum Gauge

one or two capacitance diaphragm gauges which have 1-10 VDC signal output and require up to

0.75 amp total from ± 15 volt supplies; this is sufficient to operate most heated gauges

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DUNIWAY STOCKROOM CORP.

TELEPHONE: [phone] TOLL-FREE (U.S. only): 800-446-8811 FAX: [phone] EMAIL: [e-mail]

www.duniway.com

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. Process Control Relays

two relays; contacts rated for resistive loads:
AC: 120VA: 2.0 Amps @ 60VAC, 1.0 Amps @120 VAC, 0.5 Amps@/240 VAC.
DC: 60 Watts: 2.0 Amps @ 30 VDC, 1.0 Amps @ 60 VDC, 0.4 Amps @ 150 VDC.

13. Nonvolatile Memory

for all user specified parameters

14. Analog Output

logarithmic, 0.5 volts/decade; 0.10 mTorr=0.5 volts, displays pressure for selected gauge

15. Output Power

+15 at 0.75 amp and -15 volts at 0.75 amp; sufficient to operate temperature-controlled gauges

16. Mounting

The 908A may be used as a bench-top instrument or it may be mounted in an instrument panel.
Clips are provided for panel mounting.

17. RS-232 Input/Output

allows user to read pressure and set points; 9600 baud, 8-N-1; available through the accessory
connector

18. Operating Voltage

The Model 908A has a universal power supply, which operates on input voltages from 90 VAC to

VAC 47 to 65 Hz; input is through a standard IEC 320 instrument power input receptacle on

240
the rear panel; input power is protected by fuses in both lines of the input power.

19. Weight, Model 908A only; does not include cable or CDG

0.9 lb. /0.4 kg

D. Controls and Indicators

1. GAUGE SELECT button

allows the user to select which of the two gauges are shown on the digital display

2. SELECT button

Allows selection of parameters to be adjusted, e.g. Set Points

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DUNIWAY STOCKROOM CORP.

TELEPHONE: [phone] TOLL-FREE (U.S. only): 800-446-8811 FAX: [phone] EMAIL: [e-mail]

www.duniway.com

3. RAISE and LOWER buttons

used for adjustment of gauge and instrument parameters

4. Digital Display

4-digit 7-segment bright red LED, 10 mm high

5. Display Indicators

bright red individual LED 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
USA
telephone [phone]
toll-free [phone]
facsimile [phone]
email [e-mail]
internet www.duniway.com

MKS Instruments, Inc.
Six Shattuck Rd.
Andover, Massachusetts 01810
USA
telephone [phone]
toll-free [phone])
facsimile [phone]
internet www.mksinst.com

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DUNIWAY STOCKROOM CORP.

TELEPHONE: [phone] TOLL-FREE (U.S. only): 800-446-8811 FAX: [phone] EMAIL: [e-mail]

www.duniway.com

III Installation

A. Unpack the Controller

Carefully unpack the Model 908A Dual Capacitance Diaphragm Gauge Controller. The shipment
includes these components:

• controller unit

• power cord

• mounting clips, fuses

• D-sub 15 ac

• this instruction manual

cessory connector

If your controller does not have all of these items, call Du

niway Stoc

kroom. 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.

Do not plug the power cord in yet.

B. Mount the Controller

You can rest the controller unit on a bench, table top, or shelf, or you can mount it in a rack or
cabinet. The controller unit is housed in a standard 1/8 DIN box. If you are mounting the unit in
a panel, the cutout dimensions are 1.78 inch by 3.60 inch (45.2 mm by 91.4 mm), see fig. 3, page

9. One mounting clip attaches to each of the sides of the controller unit. To attach the clip, slide
the beveled surfaces of the clip under the cutout on the side of the box and push the clip toward
the back of the unit.

Be sure to leave enough clearance at the back of the controller unit for easy ac

cess to ca

nections.

C. Select the CDG

The Model 908A controller is designed to work with standard capacitance diaphragm gauges
which operate on ±15 volts. If you have difficulty obtaining a CDG, please contact us at Duniway
Stockroom.

ble con-

CAUTION
Use of a CDG other than those which operate from ±15 volts may cause
damage to the CDG.

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