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The FMA-2600A Series mass and volumetric flow
controllers use the principle of differential pressure
within a laminar flow field to determine and control
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).
The controller uses a true proportional valve coupled
to the flow body to control flow using the integral PID
loop controller. Standard units include a
0 to 5 V output (4 to 20 mA optional) and RS232
communications. The gas-select feature and the
setpoints 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 45 metres.
Accuracy: ±(0.8% of reading + 0.2%FS)
Repeatability: ±0.2% FS
Turndown Ratio: 100:1
Control Response Time: 100 ms
Input Control Signal: 0 to 5 Vdc, RS232
Output Signal: 0 to 5 Vdc, RS232
Optional Input/Outputs: 4 to 20 mA, 0 to 10 Vdc
Operating Temperature: -10 to 50°C (14 to 122°F)
Zero Shift: 0.02%/ATM FS/°C
Span Shift: 0.02%/ATM FS/°C
Humidity Range: 0 to 100% RH, non-condensing
Excess Flow Rate: 2.4% FS
Small Valve: 303 & 302 Stainless Steel, FKM, Heat Cured Silicone Rubber, Glass Reinforced Polyphenylene Sulfide, Heat Cured Epoxy, Aluminium, Gold, Brass, 430FR Stainless Steel, Silicon, Glass.
Large Valve: 303 & 302 Stainless Steel, FKM, Heat Cured Silicone Rubber, Glass Reinforced Polyphenylene Sulfide, Heat Cured Epoxy, Aluminium, Gold, 416 Stainless Steel, Silicon, Glass.
Maximum Pressure: Mass Flow Controllers: 145 psig
To Use in Volumetric Mode: Near atmosphere, 15 psig
recommended maximum. Volumetric flowmeters and
controllers not certified for accuracy at mass flow rates
above the rated flow range of the meter. They are designed
for near atmospheric pressure conditions only. The
recommended maximum operating pressure is 15 psig
Minimum Differential Pressure Required:
5 SLM and under: 5 psid
10 to 250 SLM: 15 psid
500 SLM: 5 psid
1500 SLM: 10 psid
Supply Current: 0.250 A for 20 SLM and
under; 0.75 A for 50 SLM and above (typical)
Supply Voltage: 12 to 30 Vdc for units 20 SLM and smaller; 24 to 30 Vdc for units 50 SLM and larger
Electrical Connections: 8-pin circular mini DIN
† All amounts shown in EUR, GBP, or USD Note:
Comes complete with 24Vdc universal power supply, 1.8m cable, 8-pin male Mini-DIN connector cable, NIST certificate, and operator's manual.
For custom calibrations, add -(*) to the part number, no additional cost. Please specify gas, inlet/outlet or back pressure for custom specific calibrations.
Calibrations done at ambient temperature only
To replace the standard RS232 communications with RS485, add suffix "-RS485" to the model number
Standard input is 0-5V, for optional 4-20mA input, add suffix "-IN" to model number, no additional cost.
For 4-20mA output add suffix "-I" to model number For second channel output of 4 to 20mA add suffix "-I2" to the model number For second channel output of 0 to 5V, add suffix "-V2" to the model number Standard ouput is scaled to the mass flow rate. For volumetric flow rate as standard output add suffix "-VOL" to the part, no additional cost.
Optional secondary output are scaled the same as the primary output. For a different secondary output scale, add suffix "-T" for temperature and suffix "-P" for pressure, no additional cost.
For an integrated positive shut-off valve on models up to 20 SLPM, add suffix "-P" to the model number. Models with positive shut-off valve have 1/4" welded male VCR fittings.
For units scaled in SCFH, add suffix "-SCFH" to model number, no additional cost.
For totalizer option, add “-TOT” to model number. Please specify resolution. This is a 6 digit counter. Examples: For totalizing in litres with 1/100th resolution the max count would be 9999.99. For totalizing in litres with 1 litre resolution the max count would be 999999.
Contact sales for additional pricing and to order options
Ordering Example: (1) FMA-2601A-I2 10-32 Thread Mass Gas Flow Controller with optional second channel output of 4-20mA, £1,670.00