Thermocouple Vacuum Gauge (Catalog F28)

Thermocouple Vacuum Gauge

F28

Phone: 908-788-5550

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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.

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 per-

formance, the 531 offers fast response and

low power drain.

The 300 Series Digital 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 302 Part #302—Click for details
DISCONTINUED
Unit of Measure: EA
Est. Ship Weight=4 lbs
Control is compact and lightweight, with three mounting studs to facilitate

panel mounting in a minimum of space. The 302A Part #302A—Click for details
DISCONTINUED
Unit of Measure: EA
Est. Ship Weight=4 lbs
is mounted in a portable enclosure.

The 302 Part #302—Click for details
DISCONTINUED
Unit of Measure: EA
Est. Ship Weight=4 lbs
and 302A Part #302A—Click for details
DISCONTINUED
Unit of Measure: EA
Est. Ship Weight=4 lbs
have easy-to-read meter scales, recorder output, and include a 10

ft. gauge cable and one 531 thermocouple gauge tube. It also includes a 6-ft. power

cord. All necessary cables are included. Also available in 220V.

The Varian 300 Series Digital Thermocouple

Vacuum Gauge Controls

Specifications

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.

Part No.

Description

F0472301 Part #F0472301—Click for details
Current Price: $160.00
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Quantity in Stock=2

Varian 531 Vacuum Gauge Tube

Part No. *

Description

302 Part #302—Click for details
DISCONTINUED
Unit of Measure: EA
Est. Ship Weight=4 lbs

Panel Mount Vacuum; Gauge Control, DIGITAL

302A Part #302A—Click for details
DISCONTINUED
Unit of Measure: EA
Est. Ship Weight=4 lbs

Vacuum Gauge Controller, Mounted, DIGITAL

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

302A Part #302A—Click for details
DISCONTINUED
Unit of Measure: EA
Est. Ship Weight=4 lbs

3.03

(77)

0.5

(12.7)

1.21

(30.7)

Dia

Hex.

.56

(14.2)

A.P.

Dimensions

Inches

(Millimeters)

0.5

(12.7)

0.4

(10.2)

.50

(12.7)

Dia

.41

(10.4)

.12

(3.05)