Aalborg XFM Specifications

DIGITAL MASS FLOW METER

Design Features

Supports up to 23 Engineering Units (including User Deﬁ ned). Stores calibration data for up to 10 gases. Programmable Totalizer indicates total gas quantity. High and low gas ﬂ ow Alarm limits with preset delay interval. Two sets of user-programmable electromechanical SPDT relays with latch option. User-selectable analog 0-5 Vdc or 4-20mA outputs. Internal Conversion factors for up to 32 gases. Digital Interface (RS-232 / RS-485, Proﬁ bus DP available). Multi-Drop Capability of up to 256 units (RS-485 option). Optional Proﬁ bus DP interface with I&M functionality. Automatic sensor zero offset adjustment (via digital interface or local push button). Self-Diagnostic Tests. Local 2 x 16 characters LCD display* with adjustable back light (optional).

XFM

XFM with Proﬁ bus Interface

XFM without Readout

With I & M

Functionality

XFM with Readout Option

XFM Digital Mass Flow Meters Aluminum and Stainless Models Shown

* LCD display is not available for Proﬁ bus DP interface option.

BULLETIN 20190620

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DIGITAL MASS FLOW METER

XFM

XFM Digital Mass Flow Meters

The ﬂ ow rate can be displayed in 23 different volumetric ﬂ ow or mass ﬂ ow engineering units including user specific. Flow meters can be programmed remotely via RS-232 /RS-485 or optional Proﬁ bus DP interface.

XFM ﬂ ow meters support various functions including: programmable ﬂ ow totalizer, high and low ﬂ ow alarm, automatic zero adjustment, 2 relay outputs, jumper selectable 0-5 Vdc or 4-20 mA analog outputs, status LED diagnostic, capable to store calibration for up to 10 different gases, internal or user-speciﬁ c K-factors. Optional local 2 x 16 characters LCD display* with adjustable back light provides Flow, Total and diagnostic reading simultaneously.

Principle Of Operation

The stream of gas entering the Mass Flow transducer is split by shunting a small portion of the ﬂ ow through a capillary stainless steel sensor tube. The remainder of the gas ﬂ ows through the primary ﬂ ow conduit. The geometry of the primary conduit and the sensor tube are designed to ensure laminar ﬂ ow in each branch. According to principles of ﬂ uid dynamics, the ﬂ ow rates of a gas in the two laminar ﬂ ow conduits are proportional to one another. Therefore, the ﬂ ow rates measured in the sensor tube are directly proportional to the total ﬂ ow through the transducer. In order to sense the ﬂ ow in the sensor tube, heat ﬂ ux is introduced at two sections of the sensor tube by means of precision-wound heater sensor coils. Heat is transferred through the thin wall of the sensor tube to the gas ﬂ owing inside. As gas ﬂ ow takes place, heat is carried by the gas stream from the upstream coil to the downstream coil windings.

The resultant temperature dependent resistance differential is detected by the electronic control circuit. The measured temperature gradient at the sensor windings is linearly proportional to the instantaneous rate of ﬂ ow taking place. An output signal is generated that is a function of the amount of heat carried by the gases to indicate mass molecular based ﬂ ow rates. Additionally, the XFM model Mass Flow Meter incorporates a Precision Analog Microcontroller (ARM7TDMI® MCU) and non-volatile memory that stores all hardware speciﬁ c variables and up to 10 different calibration tables.

* LCD display is not available for Proﬁ bus DP interface option.

Interface

The digital RS485 or RS-232 interface (optional Proﬁ bus DP interface is available) provides access to applicable internal data including: ﬂ ow, CPU temperature, auto zero, totalizer and alarms settings, gas table, conversion factors and engineering units selection, dynamic response compensation and linearization table adjustment. The analog interface provides 0 to 5Vdc or 4 to 20 mA (jumper selectable) outputs for ﬂ ow reading.

Auto Zero

The XFM supports automatic sensor zero offset adjustment which can be activated locally via the maintenance push button or remotely via digital interface. The auto zero feature necessitates a condition of absolutely no ﬂ ow through the meter during the adjustment process. Provisions are made to either start, read, or save the current auto zero value via digital commands.

Totalizer

The total volume of the gas is calculated by integrating the actual gas ﬂ ow rate as a function of time.

THE DIGITAL INTERFACE COMMANDS ARE PROVIDED TO:

SET THE TOTALIZER TO ZERO. START THE TOTALIZER AT A PRESET FLOW. ASSIGN ACTION AT A PRESET TOTAL VOLUME. START/STOP TOTALIZING THE FLOW. READ TOTALIZER.

Totalizer conditions become true when the totalizer reading and the “Stop at Total” volumes are equal. In addition, the provision is made to automatically disable Totalizer during sensor warm up period.

Flow Alarm

High and Low gas ﬂ ow ALARM limits can be preprogrammed via digital interface. ALARM conditions become true when the current ﬂ ow reading is equal or higher/lower than corresponding values of high and low alarm levels. Alarm action can be assigned with preset delay interval (0-3600 seconds) to activate the contact closer (separate for High and Low alarm). Latch Mode control feature allows each relay to be latched on or follow the corresponding alarm status.

BULLETIN 20190620

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DIGITAL MASS FLOW METER

TABLE 7 - SPECIFICATIONS

XFM

FLOW MEDIUM:

CALIBRATIONS:

ENVIRONMENTAL (PER IEC 664):

FLOW ACCURACY

REPEATABILITY:

FLOW TEMPERATURE COEFFICIENT:

FLOW PRESSURE COEFFICIENT:

FLOW RESPONSE TIME:

MAXIMUM GAS PRESSURE:

MAXIMUM PRESSURE DROP:

GAS AND AMBIENT TEMPERATURE:

RELATIVE GAS HUMIDITY:

LEAK INTEGRITY:

ATTITUDE SENSITIVITY:

OUTPUT SIGNALS:

CONNECTIONS:

TRANSDUCER INPUT POWER:

** FLUID CONTACT:

CAUTION:

Please note that XFM Mass Flow Meters are designed to work only with clean gases. Never try to measure ﬂ ow rates of liquids with any XFM.

Performed at standard conditions [14.7 psia (101.4 kPa) and 70 °F (21.1 °C)] unless otherwise requested.

Installation Level II; Pollution Degree II.

±1% of FS at calibration temperature and pressure.

±0.15% of full scale.

0.15% of full scale/ °C or better.

0.01% of full scale/psi (6.895 kPa) or better.

600ms time constant; approximately 2 seconds to within ±2% of set ﬂ ow rate for 25% to 100% of full scale ﬂ ow.

500 psig (3447 kPa gauge).

0.18 PSID (at 10 L/min ﬂ ow). 4 psi (at 50 L/min ﬂ ow). See Table 10 for pressure drops associated with various models and ﬂ ow rates.

32 °F to 122 °F (0 °C to 50 °C). 14 °F to 122 °F (-10 °C to 50 °C) - Dry gases only.

Up to 70%.

-9

smL/sec He maximum to the outside environment.

1 x 10

Deviation of up to 1% from stated accuracy, after re-zeroing.

Linear 0-5 Vdc (3000 ohms min load impedance); Linear 4-20 mA (500 ohms maximum loop resistance). Maximum noise 20mV peak to peak (for 0-5 Vdc output).

XFM 17 and 37: 1/4" compression ﬁ ttings. Optional: 6mm compression, 1/4" VCR® , 3/8" or 1/8" compression ﬁ ttings.

XFM 47: 3/8" compression ﬁ ttings.

11 to 26 Vdc, 100 mV maximum peak to peak output noise. Power consumption: +12Vdc (200 mA maximum); +24Vdc (100 mA maximum); Circuit board have built-in polarity reversal protection, 300mA resettable fuse provide power input protection.

Aluminum Models: Anodized aluminum, brass, 316 stainless steel, Viton® O-rings.

Stainless Steel Models: 316 stainless steel, Viton

Optional O-ring Materials: Buna-N

Aalborg makes no expressed or implied guarantees of corrosion resistance of mass ﬂ ow meters as pertains to different ﬂ ow media reacting with components of meters. It is the customers’ sole responsibility to select the model suitable for a particular gas based on the ﬂ uid contacting (wetted) materials offered in the different models.

, EPR® (Ethylene Propylene), or Kalrez® .

O-rings.

DISPLAY:

CALIBRATION OPTIONS:

CE COMPLIANCE:

* LCD display is not available for Proﬁ bus DP interface option.

**The selection of materials of construction, is the responsibility of the customer. The company accepts no liability.

BULLETIN 20190620

*Optional local 2x16 characters LCD with adjustable backlight (2 lines of text).

Standard is one 10 points NIST traceable calibration. Optional, up to 9 additional calibrations may be ordered at additional charge.

EMC Compliance with 89/336/EEC as amended. Emission Standard: EN 55011:1991, Group 1, Class A Immunity Standard: EN 55082-1:1992.

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