Terranova Scientific 921 Instruction Manual

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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.

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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 Figures

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 ig­nition of combustible mixtures, which then might explode and cause dam­age 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 hi gh

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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