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Sierra TopTrak - Model 822/824 -Gas Mass Flow Meters with Digital Display
Sierra Instruments` Top-Trak Model 820 Mass Flow Meter is designed to replace volumetric flow rate devices at a comparable installed cost. No temperature or pressure corrections are required, as in the case of most other flow monitoring devices, such as rotometers, turbine meters or critical orifices.
Available in flow ranges from 0 to 10 sccm up to 0 to 50 slpm, Top-Trak is suitable for any clean gas flow measurement application. Wetted surfaces are rugged 316 stainless steel, nickel plating, 6/6 reinforced Nylon and Viton "O" rings; all are corrosion-resistant.
The Model 820 measures and displays the mass flow rate directly in sccm or slpm. The integral instrument display is tiltable over 180° for easy viewing and can be removed for remote panel mounting. A 0 to 5 VDC or 4 to 20 mA output signal linearly proportional to gas mass flow rate is provided for recording, data-logging or control. This device is widely used in a variety of flow validation and calibration applications-by dozens of instrument OEMs and in a multitude of laboratory, test and analytical operations.
- Direct monitoring of mass flow rate eliminates need for ancillary pressure and temperature sensing
- Digital display of mass flow rate on flow body or remote version for panel mounting
- Electronic output of mass flow rate for control or data-logging
- Fast response to changes in flow rate
- Large, straight sensor tube reduces contamination and maintenance down-time
- Platinum sensor eliminates zero drift and ensures long-term repeatability
- Primary standard calibration ensures starting point accuracy and NIST traceability
- CE Approved
Accuracy
+/- 1.5 of Full Scale under calibration conditions including linearity over 15° to 25°C and 5 to 60 psia (0.3 to 4 bara).
Repeatability
+/- 0.5% of Full Scale
Temperature Coefficient
0.08% of Full Scale per °F (0.15% of Full Scale per °C), or better
Pressure Coefficient
0.01% of Full Scale per psi (0.15% of Full Scale per bar), or better
Response Time
800 ms time constant; six seconds (typical) within +/- 2% of final value over 25 to 100% of Full Scale
Gases
Most gases; check compatibility with wetted materials; specify when ordering
Mass Flow Rates
0 to 10 sccm up to 0 to 50 slpm; flow ranges specified are for an equivalent flow of nitrogen at 760 mm Hg and 21°C (70°F); other ranges in other units are available (e.g., scfh or nm3/h)
Gas Pressure
150 psig (10 barg) maximum;
20 psig (1.4 barg) optimum
Gas & Ambient Temperature
32 to 122°F (0 to 50°C)
Leak Integrity
1 X 10-4 atm cc/sec of helium maximum
Power Requirements
12 to 15 VDC, 15 VDC nominal, 100 mA maximum 24 VDC optional
Output Signal
Linear 0 to 5 VDC, 1000 ohms minimum load resistance
Linear 4 to 20 mA, 500 ohms maximum loop resistance
Display
3.5 digit LCD (0.6 in H); removable for remote mounting
Wetted Materials
10% glass-filled Nylon® 6/6, 316 stainless steel, nickel plating,
Viton® “O”-rings standard
Neoprene® and 4079 Kalrez® “0”-rings optional