FMA1700A-1800A-Series

Supported Applications

The Omega FMA1700A and FMA1800A series are economical gas mass flow meters designed for measuring clean gases. The product overview specifies these devices are intended for applications requiring the measurement of gas flow rates, with a digital display option available on specific models.

Operating Conditions & Performance

The FMA1700A/1800A series operates within an ambient and process temperature range of 0 to 50°C (0 to 122°F). Accuracy is specified as ±1.5% of full scale, including linearity over 15 to 25°C and 5 to 60 psia (0.35 to 4.2 kg/cm²), with a repeatability of ±0.5% of full scale for units ≥100 sccm from 0 to 20% of range.

Performance characteristics include:

• Response Time: 800 msec time constant; 2 seconds (typical) to within ±2% of set flow rate over 25 to 100% of full scale
• Temperature Coefficient: 0.15% of full scale per °C or better
• Pressure Coefficient: 0.01% of full scale per psi (0.07 bar)
• Leak Integrity: 1 x 10⁻⁷ std cc/sec of helium maximum to outside environment

The series supports a measurement range from 10 SCCM to 1000 SLM. Maximum gas pressure is rated at 500 psig (35 kg/cm² gage), with 1000 psig (70 kg/cm² gage) available for ranges up to 100 SLM; the optimum operating pressure is noted as 20 psig.

Configuration Options

The series offers configurable options across body materials, display integration, and output signals. Models are designated by a range code corresponding to maximum flow rates from 10 sccm up to 1000 SLM.

• Housing Materials: Available in Economical Aluminum or Corrosion-Resistant 316 SS
• Wetted Materials (Aluminum Models): Anodized aluminum, 316 SS, brass and FKM O-rings
• Process Connections: Compression fittings are standard; the 1000 SLM model includes dual ¾ FNPT connections instead of compression fittings.
• Electrical Connection: Female 9-pin D-connector with 1 m (3') of ribbon cable
• Output Signals: Configurable for 0 to 5 Vdc or 4 to 20 mA output via specific connector options.
• Power Supply: Requires 12 to 26 Vdc power @ 200 mA maximum. Socket plug-in power supplies (FMA178PW) and portable battery packs are available as accessories.

The series supports custom calibration for gases other than nitrogen or air by adding the gas abbreviation and pressure as a suffix to the model number. Oxygen cleaned units are available with the "-02CLEAN" suffix.

Key Product Differences

The FMA1700A/1800A series is divided into two primary families based on display integration and body material:

• FMA1800 Series (With Display): Models such as FMA1802A include an integral LCD. Remote mounting of the LCD is supported via accessory cables: 3 m (10') or 7.6 m (25'). Stainless steel variants are designated with "-ST" suffixes.
• FMA1700 Series (Without Display): Models such as FMA1702A provide flow measurement without an integral display, relying on external readout or signal processing. These also offer aluminum and stainless steel body options.

Model numbers follow the pattern FMA[Series][Range Code](-ST), where the range code (e.g., 02 for 10 sccm, 45 for 1000 SLM) defines the maximum flow capacity. Accessories include specific power supplies for 115 Vac or 220 Vac and battery packs with rechargers.