Sierra Instruments, Inc.

- Model 840 - Analog Gas Mass Flow Controller

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Get accurate, reliable mass flow control with SideTrak 840 analog mass flow meter and controller. This traditional mass flow meter: Features precise primary standard calibration to measure any gas with low pressure drop. Accurately measures oxygen, mixtures, toxics, corrosives, combustibles. Is widely used in process control, leak detection and gas distribution. The 840 flow meter has proven to be one of the world’s most dependable flow controllers for over 30 years.

  • Dependable analog mass flow control for over 30 years
  • Precision control with low pressure drop
  • Proven to control toxics, corrosives and combustibles with easy, cleanable sensor tube
  • Count on durability with rugged construction

  • Ideal for general industry applications
  • Controls flows up to 500 slpm (nlpm), higher upon request
  • Large cleanable sensor tube for use with dirty gases
  • Low pressure drop
  • Primary Standard Calibration & NIST traceability
  • Available in wide variety of enclosures, process connections, input/output options and control electronics
  • Proprietary frictionless-hovering direct-acting control valve
  • 316 stainless steel construction

  • All gases including toxics and corrosives
  • Accuracy: +/- 1% of reading
  • Repeatability: +/- 0.5% of full scale
  • Mass flow ranges from 0 to 10 sccm to 0 to 500 slpm (nlpm)
  • Higher and lower flow ranges available
  • Pressure up to 500 psig (34.5 barg)
  • Gas/ambient temperature: 32°F to 176°F (0°C to 80°C)
  • Response time: 300 millisecond time constant
  • 15 VDC power supply
  • Seals: Viton®, Neoprene®, Kalrez®, Teflon®
  • 316 stainless steel construction
  • Analog signals included: 4 to 20 mA; 0 to 5 VDC
  • CE approved

Accuracy
+/- 1% of Full Scale including linearity over 15 to 25°C and 10 to 60 psia (0.7 to 4 bara); +/- 2% of Full Scale including linearity over 0 to 50°C and 5 to 150 psia (0.3 to 10 bara); +/- 1% of Full Scale accuracy at a specific temperature and pressure is available with special calibration.

For the models 840 (NPT), the accuracies above are 1.5%, +/- 3%, and +/- 1.5%, respectively. If the meter is mounted with a vertical (up or down) flow path the folowing accuracy de-rating applies.

Repeatability
+/- 0.15% of Full Scale
+/- 0.5% of Full Scale for 840 (NPT)

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(1)

  • 830 (all). . . . . . . . . . . . 300 ms time constant; 2 second (typical) to within +/-2% of set point over 20 to 100% of Full Scale
  • 840 (low, med). . . . . . 300 ms time constant; 2 second (typical) to within +/-2% of set point over 20 to 100% of Full Scale
  • 840 (high) . . . . . . . . . . 600 ms time constant; 4 seconds (typical) to within +/-2% of set point over 20 to 100% of Full Scale
  • 840 (NPT) . . . . . . . . . . 800 ms time constant; 4 seconds (typical) to within +/-5% of set point over 20 to 100% of Full Scale
  • 840 (NPT-1, 1.5”). . . . . 800 ms time constant; 4 seconds (typical) to within +/-5% of set point over 20 to 100% of Full Scale
  • 840 (NPT-2”). . . . . . . . 800 ms time constant; 12 seconds (typical) to within +/-5% of set point over 20 to 100% of Full Scale

Gases
All clean gases; specify when ordering

Mass Flow Rate
0 to 10 sccm to 0 to 5600 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 & Ambient Temperature
32° to 176°F (0 to 80°C); above 122°F (50°C) requires HT or RT option.

Gas Pressure
500 psig (34 barg) maximum;
30 psig (2 barg) optimum

Leak Integrity
5 X 10-9 atm cc/sec of helium maximum

Power Requirements

  • 830 (all). . . . . . . . . . +15 VDC @ 80 mA, 1.2 watts and -15 VDC @ 10 mA, 0.15 watts
  • 840 (low). . . . . . . . . +15 VDC @ 130 mA, 2 watts and -15 VDC @ 200 mA, 3.0 watts
  • 840 (med). . . . . . . . +15 VDC @ 400 mA, 6 watts and -15 VDC @ 300 mA, 4.5 watts
  • 840 (high) . . . . . . . . +15 VDC @ 1.13 A, 17 watts and -15 VDC @ 1.06 A, 16 watts;
  • 840 (NPT) . . . . . . . . +15 VDC @ 230 mA, 3.5 watts and -15 VDC @ 170 mA, 2.6 watts

Control Range

  • 840 (all). . . . . . . . . . 2 to 100% of Full Scale; valve shuts between 1.0% to 2.5% of Full Scale
  • 840 (NPT) . . . . . . . . 10 to 100% of Full Scale

Command Signal (For 840 Only)
0 to 5 VDC, 20 megaohms minimum input impedance 4 to 20 mA, 250 ohms maximum input impedance

Output Signal
Linear 0 to 5 VDC, 1000 ohms minimum load resistance
Linear 4 to 20mA, 500 ohms maximum loop resistance

Wetted Materials

  • 830 (all). . . . . . . . . . 316 stainless steel, Viton “O”-rings standard; Neoprene and 4079 Kalrez optional; others on special order
  • 840 (low, med, high) 316 stainless steel, 430F stainless steel, Viton “O”-rings and valve seat standard; Neoprene, 4079 Kalrez and other elastomers available on special order; PFA Teflon valve seat available
  • 840 (NPT) . . . . . . . . 316 stainless steel, Teflon valve seat, Viton “O”-rings standard; Neoprene and 4079 Kalrez optional, others on special order

Control Valve Type

  • 840 (low, med, high) Electromagnetic
  • 840 (NPT) . . . . . . . . Rotary plug valve

DataChem Labratories:
Gas Blending Meets the Bottom Line

Protein Design Labs:
Mass Flow Controllers Maximize Bioreactor Performance

Aluminum & Steel Manufacturer:
Side-Trak Automates Gas Delivery in Metal Processing Applications


CeraMem Corporation:
Sensor Manufacturer Uses Side-Trak to Automate Test Station

The Sierra Chronicles show how Sierra has provided mass flow solutions to our customers' flow challenges for the last 4 decades.  Our commitment  to increasing customer productivity and efficiency has always been and will always be, the common thread.

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