Terranova Scientific 921 User manual

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Instruction Manual
Terranova Scientific Model 921
Cold Cathode Gau
g
e 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.
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Table of Contents
I Overview page 7
A. General Description
B. Specifications
II Installation page 9
A. Unpack the Controller
B. Mount the Controller
C. Select the Gauge Tube
D. Connect the Gauge Tube
E. Attach the Gauge Cable
F. Make Relay Connections
G. Make Accessory Connections
H. Check Supply Voltage
I. Attach the Power Cord
III Operation page 12
A. Turn Power On
B. Front Panel Controls
C. Analog Output
D. Serial Interface
IV Maintenance page 17
A. Changing Fuses
B. Schematic Diagrams
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V Troubleshooting page 18
VI Return Procedure page 19
VII Warranty page 20
Application Alert page 22
List of Fi
g
ures
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
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Safety Information
High Voltage
WARNING!
The Terranova 921 Cold Cathode Gauge Controller supplies a high voltage
of 4,000 volts to the HPS Inverted Magnetron Gauge Head when the “Hi
Volt Gauge on” is activated. Be sure that the Hi Volt light is off and/or that
the power is removed from the Terranova 921 Controller before connecting
or disconnecting either end of the gauge cable.
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.
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.
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Figure 1: Model 921 Front Panel
Figure 2: Model 921 Rear Panel
ser. no.
3
10
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Figure 3: Model 921 Rear Panel, CE Model
Figure 4: Model 921 Dimensions
ser. no.
3.80 inch
96.5 mm 6.5 inch 165 mm
1.85 inch
47 mm
3.60 inch
91.4 mm
1.78 inch
45.2 mm
Mounting Cutout
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I Overview
A. General Description
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-
10 Torr (mbar) to 10-2 Torr (mBar), and controls two relays with independent set points.
B. Specifications
1. Useful Measuring Range
3 x 10-10 Torr (mBar) to 10-2 Torr (mBar), for air or nitrogen; range selection is automatic
2. Display Range
3 x 10-10 Torr (mBar) to 10-2 Torr (mBar)
3. Units of Display
torr or mBar; user selectable
4. Vacuum Gauge
HPS Inverted Magnetron gauges, series 421 or I-Mag®, series 423.
5. Operating Temperature Range
+2 to +50 deg. Celsius
6. Pressure Display
4-digit bright LED, 10 mm high
7. Display Indicators
red LED for set points and other parameters
8. Process Control Set Points
two, adjusted by front panel push-button
9. Process Control Relays
two relays, 2 amp, 240 VAC contacts; independent Normally Open and Normally Closed; +5
volts is provided for TTL applications; available through the D15 accessory connector
10. Nonvolatile Memory
for all user adjusted parameters
I-Mag® is a registered trademark of MKS Instruments Inc.
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11. Analog Output
calibrated, 12-bit resolution, logarithmic, 0.50 volts/decade
12. RS-232 Input/Output
allows user to read pressure and set points; 9600 baud, 8-N-1; available through the D15 acces-
sory connector
13. Operating Voltage
the Model 921 has a universal power supply, which operates on input voltages from 85 VAC to
265 VAC 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
manufacturer fuse type
Bussman GDB-1A or GDC-1A
Littlefuse 217 001 or 218 001
14. Weight
1 lb. / 0.5 kg
15. Mounting
Side clips are provided for panel mounting in standard 1/8 DIN cutout.
16. Environmental Considerations
not for use with explosive or corrosive gases
17. Vacuum gauge tube:
the HPS Cold Cathode (Inverted Magnetron) and cable are available from Duniway Stockroom
or HPS:
Duniway Stockroom
tel [phone] or [phone] (California)
Facsimile [phone]
Inverted Magnetron Gauge: Duniway part no. IMAG-CFF
Inverted Magnetron Cable: Duniway part no. IMAG-CBL
HPS Division of MKS Instruments
tel. [phone] (Colorado)
Facsimile [phone]
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II Installation
A. Unpack the Controller
Carefully unpack the Model 921 Gauge Controller.
The gauge controller shipment includes these components:
• controller unit
• power cord
• mounting clips
• D15 accessory connector
• this instruction manual
If your controller does not have all of these items, call Duniway Stockroom. If it appears to have
been damaged in shipment, contact the shipper.
B. Mount the Controller
You can mount the controller unit freestanding 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 44 mm by 92 mm. One mount-
ing 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 until the central tongue locks the clip in place. Then slide the unit into the panel; the clips
will hold the unit in place.
Be sure to leave enough clearance at the back of the controller unit for easy access to cable con-
nections.
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.
CAUTION
Use of a gauge tube other than those listed above may cause improper
readings, and may cause damage to the gauge tube.
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D. Connect the Gauge Tube
Make sure that the gauge tube is securely connected to the vacuum system, using good vacuum
practice.
E. Attach the Gauge Cable
The gauge cable has a two coaxial connectors for the gauge. One is a high voltage BNC (SH-
VBNC); this connector is for the 4000 volt anode excitation of the gauge. The smaller connector
is an SMB coaxial connector, for the collector signal.
Connect both connectors of the gauge cable to the gauge tube and to the 921 controller.
NOTE
If you have an HPS cable for this series of gauges, you may use it with your
Model 921 gauge controller, since connectors are the same as for the HPS
instruments.
F. Make Relay Connections
You can set two process control set points from the front panel of the controller (SET PT 1) and
(SET PT 2). The set points control two relays that are accessible through the connector on the back
of the controller. SET PT 1 controls relay #1, and SET PT 2 controls relay #2. Relay contacts are
available through the D15 Accessory Connector. See Table 1, below on page 11.
G. Make Accessory Connections
The 15-pin D-sub Accessory Connectoris 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. If you need help identifying
a source, please contact us.
H. Check Supply Voltage
The Model 921 incorporates a universal power supply. This allows the 921 to operate on any input
voltage from 90 VAC to 265 VAC, 47 to 65 Hz.
I. Attach the Power Cord
Plug the power cord into the receptacle in the power module on the rear of the 921.
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