The FMA1700A/1800A Series
electronic gas mass flow meters measure 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 aluminium/brass
construction for typical gas flows
and a 316 SS construction for
applications requiring more
The FMA1700A series without
integral display is supplied with a
field selectable analogue 0 to 5 Vdc
or 4 to 20 mA output for remote
monitoring; the FMA1800A series
has both an integral 3½ digit display
and analogue output. The display can be tilted 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).
Due to their low cost, digital
display, analogue output capability,
and insensitivity to variations in gas
temperature and pressure, the
FMA1700A/1800A Series are ideal
substitutes for many rotameter
applications. When used with the
FMA178BP portable battery pack,
the FMA1800A Series are ideal for
in-the-field calibration of flowmeters
or testing of air sampling equipment.
The FMA178BP battery pack
includes batteries, recharger, and
carrying case with shoulder strap
and belt loop. With the FMA178BP,
the flowmeter can operate in excess
of 40 hours; the batteries can be
recharged at least 200 times.
The FMA1700A/1800A Series
require 12 to 26 Vdc power @
200 mA maximum, which can be
supplied by the FMA178PW plug-in
socket power supply. The
electronics are reverse polarity
protected and have externally accessible
FMA178C (supplied separately)
provides a mating 9-pin “D”
connector with 1 metre of ribbon cable
for accessing the 0 to 5 Vdc output
signal and power input connections
(use FMA178C-MA for 4 to 20 mA
output signal connection).
The LCD supplied with the
FMA1800A Series is connected
to the lower electronics via a
modular plug. The LCD can be
remotely located by purchasing an
FMA18RC remote cable assembly. You
must then build your own
assembly for panel mounting
SPECIFICATIONS Accuracy: ±1.5% of full scale, including linearity over 15 to 25°C and 5 to 60 psia (0.35 to 4.2 kg/cm²) 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 Power Requirements:12 to 26 Vdc power @200 mA maximum Maximum Gas Pressure: 500 psig (35 kg/cm² gauge); 1000 psig (70 kg/cm² gauge) for ranges upto 100 SLM; 20 psig optimum Gas and Ambient Temperature: 0 to 50°C Leak Integrity: 1 x 10² std cc/sec of helium maximum to outside environment Materials in Fluid Contact: Aluminium models: Anodized aluminium, 316 SS, brass and FKM O-rings Stainless Steel models: 316 SS and FKM O-rings Output 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 maximum (FMA178PW) Shipping Weight: 1.1 kg Compliance: EN55011 class 1, class B; EN50082-1
† All amounts shown in EUR, GBP, or USD Note: * Comes with dual 3/4 FNPT connections instead of compression fittings.
Comes complete with compression fittings, operator's manual, and NIST traceable certficate. Power supplies sold separately.
Flow ranges specified are for nitrogen or air at 20 psig. When used for other gases, a multiplication factor is used to determine the flow rate, and the digital display must be rescaled in the field. To request a custom calibration add the gas abbreviation and pressure as a suffix to the model number.
Custom calibrations done at ambient temperature only.
For Oxygen cleaned units, add suffix "-O2CLEAN" to the model number, add £84 to price.