The Teledyne Hastings HVG-2020B is a vacuum gauge designed for precise pressure measurement across a wide range, from 1000 Torr down to 10⁻⁴ Torr. It combines a Pirani sensor and a piezo-resistive sensor to provide accurate and stable readings, with the piezo-resistive sensor offering gas species independence for direct pressure measurement. The device is available with an optional integrated touch panel color LCD display, enabling easy configuration, stand-alone operation, and local control.
Function Description:
The HVG-2020B measures vacuum pressure using a dual sensor system. The piezo-resistive sensor provides accurate absolute pressure measurements from 1000 Torr to 1 Torr, independent of gas composition. The Pirani sensor extends the measurement range down to 10⁻⁴ Torr. The instrument features thermal compensation and linearization for enhanced accuracy. It offers various output options, including analog voltage or current signals (logarithmic or linear scale), and digital communications via RS232/RS485 and USB. Two open-drain TTL alarm signals are provided to indicate when pressure exceeds or falls below predefined values. The device is designed for robust performance in industrial environments, with a 300 series stainless steel vacuum envelope, welded construction, and glass-to-metal seals, eliminating the issues associated with elastomer O-rings.
Important Technical Specifications:
- Range: 1x10⁻⁴ Torr to 1000 Torr
- Accuracy:
- ± (0.1% of reading + 0.3 Torr) from 1000 to 20 Torr
- ± (5% of reading + 0.00025 Torr) from 20 to 0.001 Torr (Nitrogen)
- ± (10% of reading + 0.00025 Torr) from 0.001 to 0.0001 Torr (Nitrogen) at ambient operating temperature without temperature/humidity effects after 2 hours warm up followed by zero adjustment.
- Warm up time: Within rated accuracy at atmosphere: 30 minutes (typical). For zero adjustment: 2 hours (typical).
- Installation orientation: Any
- Internal volume: 3.5 cc (1/4" stub tube, other connections will be larger)
- Maximum Pressure: 1000 Torr
- Maximum overpressure: 2000 Torr / 25 psig (no change in performance)
- Burst pressure: 3000 Torr / 45 psig
- Operating Temperature: -20°C to 70°C
- Humidity: 30 to 90 %RH, non-condensing
- Thermal Zero Shift: < 3.5 mTorr (over -20 to 70°C range)
- Thermal Span Shift:
- < 0.6% of reading above 10 Torr (over -20 to 70°C range)
- < 5% of reading below 10 Torr (over -20 to 70°C range)
- Leak Integrity: < 1x10⁻⁹ std. cc/s
- Analog Output:
- 0-1 VDC, 0-5 VDC, 0-10 VDC (short-circuit protected, 1 kΩ min load)
- 0-20 mA, 4-20 mA (short-circuit protected, 1.2 kΩ max load)
- Power Requirements:
- With display: 2.1 watts max. / 12 to 36 VDC (1.5 W typ. @ 24 VDC)
- No display: 1.8 watts max. / 12 to 36 VDC (1.3 W typ. @ 24 VDC)
- Class 2 power 150 VA max fused
- Wetted Materials: 304 and 316 stainless steel, glass, nickel, gold plated tungsten
- Weight (approx.): 0.6 lb. (0.27 kg) without fitting
- Set points: Open-drain configuration (5 V / 5 mA max input)
- Connectors:
- 2mm bayonet-style power jack (power)
- 9-pin "D" connector (power, analog signals, TTL serial)
- 3.5 mm TRRS jack (RS232/485 serial communications)
- USB micro-B (virtual COM port for serial communications)
Usage Features:
- Color Display with Touch Panel: Provides an intuitive interface for configuration and monitoring. Users can view pressure, temperature, and other parameters, and adjust settings directly from the display.
- Multiple Display Views: The VIEW icon allows users to cycle through five possible main screens (views), including Pressure View, Pressure and Temperature View, Setpoint View, Bar Graph View, and History Graph View.
- MENU Button: Accesses a multipage ring of menu items for advanced settings, including Screen Orientation, Set Zero, Device Info, Analog Output, Gas Select, Serial Port, and Restore Factory Defaults.
- Gas Correction: Internal corrections are available for the Pirani sensor when used with gases other than nitrogen, improving accuracy for specific applications.
- Digital Communications: Equipped with RS232/RS485 and USB for seamless integration into control systems. The USB connector functions as a virtual COM port, eliminating the need for external converters.
- Analog Outputs: Provides flexible analog output options (voltage or current) for easy integration with existing analog control systems. Current loop outputs (0-20 mA or 4-20 mA) minimize noise pickup and signal loss over long cable runs.
- TTL Alarms: Two configurable alarm signals (open-drain) can be set to trigger when pressure crosses user-defined thresholds, providing critical process control feedback.
- LED Indicators: Two LEDs provide quick visual feedback on instrument status and system pressure.
- Quick Start Guide: Includes clear instructions for unpacking, installing, connecting, and performing initial setup, including zero adjustment.
Maintenance Features:
- Calibration Procedure: Detailed steps for calibrating the HVG-2020B using actual gas, including adjustments for nitrogen and other specific gases.
- Troubleshooting Guide: Provides symptoms and actions for common issues, such as communication problems, pressure gauge errors, and LED indications.
- Authorized Maintenance: Emphasizes that maintenance should be performed by qualified personnel to ensure proper function and prevent damage.
- Warranty Policy: Information on the company's warranty policy and return procedures is provided, along with contact details for repair and support.
- Robust Construction: The use of 300 series stainless steel, welded construction, and glass-to-metal seals minimizes maintenance needs by preventing permeation, degradation, and outgassing issues common with elastomer O-rings.
- Factory Defaults: Option to restore factory default settings, simplifying troubleshooting and re-configuration.
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