- ▶
- Heaters/Source
- ▶
- Agilent Heaters and SensorsMass Spectrometry, Scientific Supplies & ManufacturingScientific Instrument Services 5973 Source Heater Tamper Resistant Allen Wrench 5973/5975 Quad Sensor 5985 Source Heater Assembly Agilent Interface Heater Assembly 5971 Interface Heater
- ▶
- VacuumPumps Oils/Greases Gauge & Tubes Hose & Accessories Filters - Oil/Charcoal Foreline Traps Gaskets & Material Fittings O-Rings Pump Parts (Precision Plus) Quality Monitor System Distillation Control Acoustic Enclosures For Rotary Vane Pumps Other Vacuum Accessories Digital Vacuum pressure regulator (VPC) Catalog Page F1
- ▶
- Vacuum Gauge & TubesDigiVac Bench Top Vacuum Gauges Bullseye Precision Gauge-DigiVac Instrutech CVG Worker Bee Instrutech VGC-301 Controller Granville-Phillips Model 475 Convectron Controller Granville Phillips - Controller Bayard Alpert - Controller STABIL-ION® Vacuum Measurement System - Granville Phillips Agilent/HP 5971 Bayard Alpert Vacuum Measurement System Varian 300 - Digital Thermocouple gauge Foreline Gauge Assembly Convectron Series 275 Vacuum Gauge Tube - Bayard Alpert Tube - 5 Pin In-Line Triode & Mini Ion Gauge Tube with 90° Elbow Triode & Mini Bayard-Alpert Ion Gauge Tubes Ion Gauge Tubes - Agilent Micro ion gauge for the Agilent 5975/5977 Tube - Thermocouple Tube Controller - Thermocouple Adapter Flange PTFE Ferrules for Ion Gauge
- Vacuum Supplies for Thermo/Finnigan MSDiffusion Pump Heater Discs and Cartridges for Thermo/Finnigan MassSpecs Copper and Gold Plated Copper Gaskets for Thermo/Finnigan MAT Flanges Santovac® 5P Ultra Vacuum Pump Fluid Varian Thermocouple Vacuum Gauge Tube Model 531 PTFE and Glass Filled PTFE Ferrules for Ion Gauge Tubes Ionization Gauge Tubes, Bayard-Alpert Type Viton® O-Rings for the Thermo/Finnigan Mass Spec Thermo/Finnigan MAT PTFE O-Rings
- ▶
- Tube - Thermocouple Tube (This Page)
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.
Principles of Operation
Thermocouple 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.
Identical to the Agilent/Varian F0472301 and Thermo/Finnigan #00105-02000.
Specs
| 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 to 14mV |
| Heater Resistance | 1.4 ohms (approx.) |
| Dimensions | 1.21" O.D. x 3" long |
| Connections | May be soldered into a system, used with 1/2" '0' ring compression seal or threaded on 1/8" MNPT fitting. |
| Cable Connection | Octal Base (std.) |
| Casing | Nickel-plated mild steel |
| Pins | Nickel-iron alloy (Ni 48%, Fe 52%) |
| Volume/Weight | 12cc/2oz. |
Varian Thermocouple Vacuum Gauge Controls - 800 Series The 800 Series Thermocouple Vacuum Gauge Controls are used for repeatable, stable pressure measurement in the 10 -3 Torr to 2 Torr range.
Varian 800 Thermocouple vacuum gauge control 
Wing-Nut Aluminum Clamp 
QF Stainless Steel Tees 
Rollerflex Vacuum Hose 
Centering Ring Assembly, 304 Stainless and Aluminum 
Blank Flanges in Brass, Aluminum and Stainless 
Stainless Steel Oil Mist Eliminator 
QF to QF Reducers, 304 Stainless