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The FMA-LP1600A Series mass and volumetric
flowmeters use the principle of differential pressure
within a laminar flow field to determine the mass flow
rate. A laminar flow element (LFE) inside the meter
forces the gas into laminar (streamlined) flow. Inside
this region, the Poiseuille equation dictates that the
volumetric flow rate be linearly related to the
pressure drop. A differential pressure sensor is used
to measure the pressure drop along a fixed distance
of the LFE. This, along with the viscosity of the gas, is
used to accurately determine the volumetric flow rate.
Separate absolute temperature and pressure sensors
are incorporated and correct the volumetric flow rate
to a set of standard conditions. This standardized flow
rate is commonly called the mass flow rate and is
reported in units such as standard cubic feet per
minute (SCFM) or standard liters per minute (SLM).
Standard units include a 0 to 5 V output (4 to 20 mA
optional) and RS232 communications. The gas select
feature can be adjusted from the front keypad or via
RS232 communications. Volumetric flow, mass flow,
absolute pressure, and temperature can all be viewed
or recorded through the RS232 connection. It is also
possible to multi-drop up to 26 units on the same serial
connection to a distance of 38 m (125'). These flowmeters
can be powered by the optional battery pack
FMA1600-BP for use in the field.
Specifications Mass Reference Conditions: (STP) 25ۥC, 14.7 PSIA Accuracy: ±(0.8% of rdg ± 0.2% FS) Repeatability: ±0.2% Turndown Ratio: 200:1 Response Time: 10 ms typical default response time for 63.2% of a step change. A variable register allows response time to be field adjustable via RS232 communications. Output: 0 to 5 Vdc standard Operating Temperature: -10 to 50°C (14 to 122°F) Zero Shift: 0.02% FS/°C/atm Span Shift: 0.02% FS/°C/atm Humidity Range: 0 to 100% non-condensing Pressure (Maximum): 50 psig Measurable Flow Rate: 125% FS Supply Voltage: 7 to 30 Vdc (15 to 30 Vdc for 4 to 20 mA output) Supply Current: 40 mA typical current draw; 100 mA available supply recommended Cable Connection: 8-pin mini DIN Wetted Parts: 302 and 303 SS, FKM, silicone RTV, nylon 616, aluminum Ingress Protection: IP40 Communications: RS232 standard, RS485 (optional)
† All amounts shown in DKK Noter: Comes complete with 24 Vdc universal power supply, 1.8m (6') cable, 8-pin male Mini- DIN connector, operator’s manual, and NIST certificate.
Units are calibrated to air @ 5 psig for 0 to 1 LPM, 15 psig for 2 to 10 LPM, 30 psig for 20 to 100 LPM, and 50 psig for 200 LPM and greater.
Calibrations done at ambient (21C/70F) temperature only.
To replace the standard RS232 communications with RS485, add suffix “-RS485” to the model number; add $120 to the price.
Standard input is 0 to 5V, for optional 4 to 20 mA input add suffix “-IN” to the model number; no additional cost.
Standard output is scaled to the mass flow rate.
For volumetric flow rate as standard output add suffix “-VOL” to the model number; no additional cost.
**Optional secondary output are scaled the same as the primary output scale. For an alternate output scale add suffix “-T” to the model number
for temperature or “-P” for pressure; no additional cost.
††Portable versions have an integral battery compartment
on the meter and come with one 9V battery installed. Option not available on “-I” or “I2” models where 4 to 20mA is the chosen output.
For units scaled in SCFH, add suffix “-SCFH” to model number; no additional cost. Please specify the desired range in SCFH.
For totalizer option, add suffix “-TOT” to the model number; add $120 to the price. Please specify resolution. This is a 6-digit counter. Examples: For totalizing in liters with 1/100 liter resolution, the max count would be 9999.99. For totalizing in liters with 1 liter resolution, the max count would be 999999.
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