TELEDYNE HASTINGS INSTRUMENTS DESIGN FEATURES Teledyne Hastings Instruments (THI) Economy Vacuum Gauges, Models VH-3 and VH-4, are stable, dependable instruments for less demanding applications. These modular gauges feature solid-state construction with a taut-band meter and provide rapid response. The gauge tubes have excellent stability and ruggedness and provide pressure measurements over the 0-5 and 0- 50 Torr ranges. Dual-scale meter faces also provide millibar readings. Environmental tests show that the gauge tube is stable over a wide temperature range. The instruments are relatively free of cable-length effects, permitting changes of cable length up to 25 feet without readjustment or recalibration. THI VH-3 and VH-4 Vacuum Gauges use a noble metal thermopile circuit. The hot junctions of the thermopile are heated directly by an AC current, while an equal number of cold junctions are kept at ambient temperature by heavy mounting studs. Thus a DC voltage is generated between hot and cold junctions. As the pressure decreases, the lowering of the thermal conductivity of the gas surrounding the hot junctions tends to increase the temperature of the hot junctions, thus increasing the output of the thermopile. Vacuum Controllers THI Economy Vacuum Controllers, CVH Models, are fully automatic, continuousreading instruments for less demanding applications. These modular instruments provide dependable control with simplicity and economy. The gauge tubes have excellent stability and ruggedness and provide pressure measurements over the 0-5 and 0-50 Torr ranges. Dual-scale meter faces also provide millibar readings. Providing control throughout the entire scale, the adjustable control arm is set with the pointer at the pressure desired. VH Series FEATURES • Two Standard Ranges (0-5 Torr and 0-50 Torr) • Optional Single or Double Control Points • Ready for Panel Mounting • Optional Sensor Fittings • Fail Safe: Loss of Power = Loss of Vacuum • Complete Installation and Calibration Accessories APPLICATIONS Processes Requiring Accurate Vacuum Measurement & Control: • Glove Boxes • Thermal Food Containers • Vacuum Furnaces • Pharmaceutical Production • Freeze Drying • Agricultural Processes • Air Conditioning • Accelerators • Plasma Coating • Refrigeration (HVAC) • Cryogenics • Appliance Manufacturing ECONOMY ANALOG VACUUM METERS AND CONTROLLERS Panel Mount Meter Panel Mount Controller Calibration Reference Tubes

SPECIFICATIONS VH-SERIES VACUUM METERS & CONTROLLERS Power 115 VAC 50/60 Hz E Option 230 VAC 50/60 Hz Cables (approx.) 6-ft power cable and 8-ft. sensor cable attached. Extensions available. Weight (approx.) VH 1.2 lbs (0.55 kg) CVH 2.5 lbs (1.13 kg) Relays (CVH units) 115 V, 5 A SPDT @ 250 VAC noninductive. Normally open and normally closed. DIMENSIONS (Reference only) VH 3.50" (W) x 3.40" (H) x 2.55" (D) 89mm (W) x 86mm (H) x 65mm (D) CVH 5.00" (W) x 4.25" (H) x 7.25" (D) 127mm (W) x 108mm (H) x 184mm (D) STANDARD METAL GAUGE TUBE Overpressure 50 psig max. Material of Construction Nickel-plated...

VH SERIES VH Series CVH Series All dimensions shown are in inches.

Your Customer Service Representative Telephone: (757) 723-6531 Toll Free: (800) 950-2468 Fax: (757) 723-3925 World Wide Web: http://www.teledyne-hi.com E-mail: [email protected] P.O. Box 1436 Hampton, VA 23661 VH SERIES PB 106-2/03 © Teledyne 2003 All Rights Reserved. Selection Chart Each vacuum meter or controller is shipped with approximately 6-ft. power and 8-ft. gauge tube cables. Sensors and extension cables are sold separately. Gauges Stock No. Model No. Description 55-74 VH-3 (1) 5 T Economy Gauge 55-88 VH-4 (1) 50 T Economy Gauge 55-270 VH-3/4 115v Circuit Card of VH-3/4...