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The convection gauge is the lowest cost instrument that can provide a continuous monitoring and control of your vacuum system from atmosphere all the way down to 1 mTorr. The gauge tube is all stainless steel and has both 1/8 inch NPT and 1/2 inch O.D. smooth tubulation for sealing in compression ports. Optional flanges include NW and Conflat® and are described in the ordering information section below.

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Nitrogen, Argon and Other Gases

As a general purpose instrument for monitoring the pump down of systems vented to air or nitrogen, the convection gauge is an excellent choice. The convection gauge can be provided to read directly for argon or other gases. But, if your system uses a variety of gases, or if accuracy between 2 Torr and 800 Torr is critical in your process, then our diaphragm manometer instruments may be a better selection.

Features:

• Wide Range; 1 mTorr to Atmosphere
• Select Calibration in Torr, Pascal, or mBar
• Linear Analog Outputs for Computer Interface
• Large Easy To Read Green LED Display
• 1/4 DIN Bench or Panel Mount Enclosure
• Two Set Points with 3 Amp Relays Optional
• Single Sensor Covers Entire Range
• Under 1 Second Response to Rising Pressure
• All Cables and Mounting Hardware Included
• Extension Cables Available up to 500 Feet

Specifications:

• Range of Measurement: 1 milliTorr to Atmosphere; Pa, mbar available.
• Sensor Type: Thermal convection.
• Resolution: ± 1 milliTorr from 1 to 2000 milliTorr; ± 1 Torr above 2 Torr.
• Response Time: Less than 1 second for 90% of an increase in pressure, less than 4 secs. for a decrease in pressure from atmosphere to 1 mTorr.
• Hysteresis: Minimum hysteresis is less than 2 mTorr from 1 to 2000 mTorr and less than 2 Torr from 2 Torr to atmosphere. To prevent relay chatter hysteresis is adjustable to as high as 5% of full range.
• Maximum Pressure without Calibration Change: 2300 Torr (30 PSIG)
• Maximum Gauge Tube Temperature: 100 °C (212 °F) maximum bake out of gauge tubes in air or vacuum. Automatic compensation 0 to 35°C.
• Display: 3 1/2 digit, Green LED character height 11 mm (.47 in.) 2 ranges: 1 mTorr to 1999 mTorr and 1 Torr to 777 Torr.
• Analog Outputs: Convection Gauge has 3 simultaneous outputs:

• 1 mTorr to 2000 mTorr: 1 mV per mTorr (0 to 2 VDC Linear)
• 2 Torr to 20 Torr: 100 mV per Torr (0.2 to 2 VDC Linear)
• 20 Torr to 800 Torr: 1 mV per Torr (.020 to .800 VDC Linear)
• Gauge Tube Orientation: Axis of tube must be horizontal.
• Line Power: 95 to 125 VAC, 50/60 Hz; 220 VAC optional, no extra cost.
• Wattage: 5 watts with both relays energized.
• Line Cord: 3 wire 1.7 meter (65 inch) attached.
• Gauge Tube Cable: Standard length is 3 m (10 ft.) attached to cabinet. Use up to 150 m (500 ft.) without affecting calibration.
• Mounting: 1/4 DIN enclosure suitable for panel or bench mounting. Panel mounting jack screws included. Carry handles also available.
• Weight with Gauge Tube: Net: 1 lb. 2 oz. (0.5 kg); Ship: 3 lbs. (1.4 kg.)
• Optional Set Points and Relays: 2 independent set points with front panel LED indicators and 2 SPDT relays 3 amp @ 115 VAC, non-inductive. Adjustable from front panel over 100% of range.

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