Aalborg XFM Mass Flow Meters
Digital thermal mass flow meters for clean gases
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- Manufactured by Aalborg
- Supports up to 23 engineering units (including user-defined)
- Stores calibration data for up to 10 gases
- Programmable totalizer indicates total gas quantity
- High and low gas flow alarm limits with preset delay interval
- Two sets of user-programmable elecromechanical SPDT relays with latch option
- User-selectable analog 0-5 VDC or 4-20 mA outputs
- Internal conversion factors for up to 32 gases
- RS-232/RS-485/Profibus DP digital interfaces available
- Automatic sensor zero offset adjustment (via digital interface or local push button)
The Aalborg XFM mass flow meter is designed to work with clean gases. The meters are available in aluminum or stainless steel models. Flow rates can be displayed in 23 different volumetric flow or mass flow engineering units including user specific units.
The Aalborg XFM flow meter supports many functions including: a programmable flow totalizer, high and low flow alarm, automatic zero adjustment, 2 relay outputs, jumper selectable 0-5 VDC or 4-20 mA analog outputs, and status LED diagnostics. The XFM also stores calibration information for up to 10 different gases and supports internal or user-specific k-factors.
The Aalborg XFM digital mass flow meter is available with a digital RS485 or RS-232 interface (an optional Profibus DP interface is also available) which provides access to applicable internal data including: flow, CPU temperature, auto zero, totalizer and alarm settings, gas table, conversion factors and engineering units selection, dynamic response compensation and linearization table adjustment. The analog interface provides 0 to 5 VDC or 40 to 20 mA (jumper selectable) outputs for flow reading.
The Aalborg XFM supports automatic sensor zero offset adjustment which can be activated locally or remotely via digital interface. The totalizer function calculates the total volume of gas by integrating the actual gas flow rate as a function of time. High and low gas flow alarm limits can be preprogrammed via digital interface. Alarm conditions become true when the current flow reading is equal or higher/lower than corresponding values of high and low alarm levels.
|Aalborg XFM Digital Mass Flow Meter Specifications|
|Flow Medium||Please note that XFM mass flow meters are designed to work only with clean gases. Never try to measure flow rates of liquids with any XFM|
|Calibrations||Performed at std. conditions [14.7 psia (101.4 kPa) and 70°F (21.1°C)] unless otherwise requested|
|Enivronmental (PER IEC 664)||installation Level II; Pollution degree II|
|Flow Accuracy||±1% of FS at calibration temperature and pressure|
|Repeatability||±0.15% of full scale|
|Flow Temperature Coefficient||0.15% of full scale/°C or better|
|Flow Pressure Coefficient||0.01% of full scale/psi (6.895 kPa) or better|
|Flow Response Time||600 ms time constant; app. 2 seconds to within ±2% of set flow rate for 25% to 100% of full scale flow|
|Max. Gas Pressure||500 psig (3447 kPa gauge)|
|Max. Pressure Drop||0.18 PSID (at 10 L/min flow). 4 psi (at 50 L/min flow).|
|Gas and Ambient Temperature||32 to 122°F (0 to 50°C). 14 to 122°F (-10 to 50°C) - Dry gases only|
|Relative Gas Humidity||Up to 70%|
|Leak Integrity||1 x 10-9 smL/sec He maximum to the outside environment|
|Attitude Sensitivity||Deviation of up to 1% from stated accuracy, after re-zeroing.|
|Output signals||Linear 0-5 Vdc (3000 ohms min load impedance); Linear 4-20 mA (500 ohms maximum loop resistance). Maximum noise 20 mV peak to peak (for 05 Vdc output)|
|Connections||XFM 17 and 37: 1/4" compression fittings. Optional : 6mm compression, 1/4" VCR, 3/8" or 1/8" compression fittings. XFM 47: 3/8" compression fittings.|
|Transducer Input Power||11 to 26 VDC, 100 mV maximum peak to peak output noise. Power consumption: +12 VDC (200 mA max); +24 VDC (100 mA max.); Circuit board have built-in polarity reversal protection, 300 mA resettable fuse provide power input protection.|
|Wetted Materials||Aluminum Models: Anodized aluminum, brass, 316 stainless steel, viton O-rings.
Stainless Steel Models: 316 stainless steel, Viton O-rings
Optional O-ring materials: Buna-N, EPR (Ethylene Propylene), or Kalrez.
|Caution||Aalborg makes no expressed or implied guarantees of corrosion resistance of mass flow meters as pertains to different flow media reacting with components of meters. It is the customers' sole responsibility to select the model suitable for a particular gas based on the fluid contacting (wetted) materials offered in the different models.|
|Display||Optional local 2 x 16 characters LCD with adjustable backlight (2 lines of text)|
|Calibration Options||Standard is one 10 point NIST traceable calibration. Optional, up to 9 additional calibrations may be ordered at additional charge|
|CE Compliance||EMC Compliance with 89/336/EEC as amended. Emission Standard: EN 55011:1991, Group 1, Class A Immunity Standard: EN 55082-1:1992.|