SIS Catalog Online

F13

Thermocouple Vacuum Gauge

Scientific Instrument Services, Inc.

™

FAX: 908-806-6631

www.sisweb.com/catalog/08/F13

The Varian Thermocouple Vacuum Gauge Tube Model 531

Filament Current

165 mA (gives 14 mV across the thermocouple at pressures below 10

-3

Torr)

Response Time

3 sec. (10

-3

to 1.0 Torr)

Range

1 x 10

-3

to 2 Torr

Output

0 to14mV

Heater Resistance

1.4 ohms (approx.)

Dimensions

1.21" O.D. x 3" long

Connections

May be soldered into a system, used with1/2" '0' ring compression seal or

threaded on 1/8" IPS female thread.

Cable Connection

Octal Base (std.)

Casing

Nickel-plated mild steel

Pins

Nickel-iron alloy (Ni 48%, Fe 52%)

Volume / Weight

12 cc / 2 oz.

1.21
(30.7)
DIA.

Dimensions

Inches

Millimeters

Hex.

.56

(14.2)

A.F.

0.5

(12.7)

0.4

(10.2)

.50

(12.7)

Dia.

.41

(10.4)

Dia.

.12

(3.05)

IPS

3.03

(77)

0.5

(12.7)

General Description

The

Model

531

Thermocouple

Vacuum Gauge provides continuous and
accurate indication of total pressure from 1
x 10

-3

to 2 Torr absolute. Developed to

combine rugged dependability and
outstanding performance, the 531 offers
fast response and low power drain.

The 800 Series Thermocouple Vacuum Gauge Controls are used for repeatable,

stable pressure measurement in the 10

-3

Torr to 2 Torr range. These controls are

fully temperature compensated by use of a thermistor placed in the gauge cable
socket. The thermal response of the thermistor is equal to, but in the opposite
direction from the thermocouple characteristics, thereby compensating for
ambient temperature changes.

The 801 Part #801--Click to order
Current Price: $275.00
Unit of Measure: EA
Est. Ship Weight=4 lbs
Quantity in Stock=1
Control is compact and lightweight, with three mounting studs to

facilitate panel mounting in a minimum of space. The 802A Part #802A--Click to order
Current Price: $335.00
Unit of Measure: EA
Est. Ship Weight=4 lbs
Quantity in Stock=1
is mounted in a
portable enclosure. The 801 Part #801--Click to order
Current Price: $275.00
Unit of Measure: EA
Est. Ship Weight=4 lbs
Quantity in Stock=1
and 802A Part #802A--Click to order
Current Price: $335.00
Unit of Measure: EA
Est. Ship Weight=4 lbs
Quantity in Stock=1
have easy-to-read meter scales,
recorder output, and include a 10 ft. gauge cable and one 531 thermocou-
ple gauge tube. It also includes a 6-ft. power cord. All necessary cables are
included. The 302 Part #302--Click to order
Current Price: $300.00
Unit of Measure: EA
Est. Ship Weight=4 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.
models are the same except they have a digital read-
out. Also available in 220V.

The Varian 800 Series Thermocouple
Vacuum Gauge Controls

Specifications

802A Part #802A--Click to order
Current Price: $335.00
Unit of Measure: EA
Est. Ship Weight=4 lbs
Quantity in Stock=1

Principles of Operation

T

hermocouple gauges measure pressure in terms of the amount of
heat that gas will conduct away from a hot wire. The sensing
element is a combination heater and thermocouple. Cross-shaped,

it is formed by joining two short resistance wires of different compositions, a
method of construction which gives excellent shock resistance and yet
provides the minimum mass required for fast response. With a fixed heater
power, the temperature of the junction, which depends on the conductivity of
the gas, is indicated by the voltage output of the thermocouple. As the
pressure drops, the thermocouple gets hotter and its output increases.
Readout is accomplished on a millivolt meter calibrated to indicate pressure.

801 Part #801--Click to order
Current Price: $275.00
Unit of Measure: EA
Est. Ship Weight=4 lbs
Quantity in Stock=1

302A Part #302A--Click to order
Current Price: $375.00
Unit of Measure: EA
Est. Ship Weight=4 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.

Part No.

Description

F0472-301 Part #F0472301--Click to order
Current Price: $79.00
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Quantity in Stock=4

Varian 531 Vacuum Gauge Tube

Part No. *

Description

801 Part #801--Click to order
Current Price: $275.00
Unit of Measure: EA
Est. Ship Weight=4 lbs
Quantity in Stock=1

Panel Mount Vacuum Gauge Control, ANALOG

802A Part #802A--Click to order
Current Price: $335.00
Unit of Measure: EA
Est. Ship Weight=4 lbs
Quantity in Stock=1

Vacuum Gauge Controller, Mounted, ANALOG

302 Part #302--Click to order
Current Price: $300.00
Unit of Measure: EA
Est. Ship Weight=4 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.

Panel Mount Vacuum; Gauge Control, DIGITAL

302A Part #302A--Click to order
Current Price: $375.00
Unit of Measure: EA
Est. Ship Weight=4 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.

Vacuum Gauge Controller, Mounted, DIGITAL

* For 220V Controls add “220” to each part number (i.e. - xxx-220)

Related information may be found on the following pages of our web site:

Page	Parts
Thermocouple Gauge Tube for Finnigan Vacuum Pumps	F0472301
Varian 800 Thermocouple vacuum gauge control, pg F9	801, 802A
Varian thermocouple vacuum gauge tube Model 531-pg F9	F0472301

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