DUNIWAY Stockroom Terranova 908A Manuale utente
DUNIWAY STOCKROOM CORP.
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Instruction Manual
Terranova
Model 908A Dual Capacitance Diaphragm
Gauge Controller
Copyright © 2000 by Duniway Stockroom Corp.
rev100410sr
TELEPHONE: 650-969-8811 TOLL-FREE (U.S. only): 800-446-8811 FAX: 650-965-0764 EMAIL: [email protected]
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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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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: MKS Baratron Pin Connections (5 pin) page 11
Figure 7. MKS Baratron Pin Connections (9 pin ‘D’) page 11
Figure 8: Accessory Connector -- 15 Pin Female D-Sub page 12
Figure 9: Accessory Connector Signals and Pins page 12
Figure 10: Protective Circuits/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 page 22
Figure 17: Torr-Pascal Relationship - Terranova 908J page 24
Figure 18: Error Codes page 26
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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
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 pos-
itive 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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II 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
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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 gaug-
es. The 908A precisely measures the 0 to 10 volt signal from the CDG to determine pressure. The
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;
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 di-
aphragm 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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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
240 VAC 47 to 65 Hz; input is through a standard IEC 320 instrument power input receptacle on
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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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 (650) 969-8811
toll-free (800) 446-8811
facsimile (650) 965-0764
internet www.duniway.com
MKS Instruments, Inc.
Six Shattuck Rd.
Andover, Massachusetts 01810
USA
telephone (978) 975-2350
toll-free (800) 227-8766)
facsimile (978) 975-0093
internet www.mksinst.com
TELEPHONE: 650-969-8811 TOLL-FREE (U.S. only): 800-446-8811 FAX: 650-965-0764 EMAIL: [email protected]
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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 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.
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 access to cable con-
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.
CAUTION
Use of a CDG other than those which operate from ±15 volts may cause
damage to the CDG.
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D. Connect the CDG
Make sure that the CDG is securely connected to the vacuum system, using good vacuum
practice.
E. Attach the CDG Cable
The CDG cable has a 9-pin D-sub connector on one end, which plugs into the 908A, see Figure
4, below. There are a variety of conventions for connection to the CDG; you may assemble or
modify the cable to adapt to the CDG as needed. Connect the 9-pin D-sub plug of the gauge cable
to the 9-pin connector on the back of the 908A controller unit. Push the plug onto the connector
until it is firmly in place. Tighten the retaining screws to make certain the connector remains in
place. Loose connections can cause faulty readings.
Figure 4: Model 908A Sensor Connector -- 9 Pin Female D-Sub Connector
NOTE
The following information will allow you to make modifications to the ca-
ble as needed to interface with your CDG. Please refer to Figure 4 above;
this shows the 9-pin connector which is on the rear panel of the 908A. This
connector has female sockets; the mating connector on the CDG cable must
have male pins
908A 9-pin ‘D’ to MKS Baratron 15-pin ‘D’
908A Pin Terranova Name Color Tube Pin/Connection Name
1 Tube #1 Signal white to: Tube#1, Pin 2/Signal Output
2 Tube #2 Signal white to: Tube#2, Pin 2/Signal Output
3 Tube #2 Signal Return brown to: Tube#2, Pin 12/Signal Common
4 +15 volts red to: Tube#1, Pin 7/+15 VDC
5 +15 volts red to: Tube#2, Pin 7/+15 VDC
6 -15 volts green to: Tube#1, Pin 6/-15 VDC
7 -15 volts green to: Tube#2, Pin 6/-15 VDC
8 Tube #1 Signal Return brown to: Tube#1, Pin 12/Signal Common
9 Electronics Common black/shield to: Tube#1,Pins5/Pwr.Comm & 15/& Chassis Gnd
9 Electronics Common black/shield to: Tube#2,Pins5/Pwr.Comm & 15/& Chassis Gnd
Figure 5: 908A -- MKS Baratron Pin Connections (15 pin)
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