Features

The FMA1700A/1800A Series eletronic gas mass flow meters provide for monitoring the flow of a wide variety of gases from 10 SCCM up to 1000 SLM. Utilizing heat transfer through a heated tube to measure molecular gas flow rate, the FMA1700A/1800A provides measurement of direct gas mass flow rate, without the need to compensate for variations in gas temperature or pressure (within stated limits). They are available in an economical aluminum/brass construction for typical gas flows and a 316 SS construction for applications requiring more corrosion resistance. The FMA1700A series without integral display is supplied with a field selectable analog 0 to 5 Vdc  or 4 to 20 mA output for remote monitoring; the FMA1800A series has both an integral 3¹⁄₂ digit display and analog output. The display is  tiltable over 90 degrees for viewing convenience. The display is calibrated standard to read out directly in SCCM or SLM for nitrogen (other gas calibrations available on special order)

SPECIFICATIONS

 Repeatability: ±0.5% of full scale  and for units ≥100 scm from 0 to 20% of range

Temperature Coefficient: 0.15% of full scale per °C or better

Pressure Coefficient: 0.01% of full scale per psi (0.07 bar)

Response Time: 800 msec time  constant; 2 seconds (typical) to within ±2% of set flow rate over 25 to 100% of full scale

Maximum Gas Pressure: 500 psig  (35 kg/cm2 gage);1000 psig (70 kg/cm2 gage) for ranges up to 100 SLM;  20 psig

optimumGas and Ambient Temperature:  0 to 50°C (0 to 122°F)

Leak Integrity: 1 x 10-9 std cc/sec of helium maximum to outside environment 

Stainless Steel Models: 316 SS    and FKM O-ringsOutput Signal    Linear 0 to 5 Vdc: 1000 Ω   minimum load    4 to 20 mA: 50 to 250 Ω loop resistance

Transducer Power: 12 Vdc @  200 mA

maximumShipping Weight: 1.1 kg (2.5 lb)

Compliance: EN55011 class 1, class B;