Aalborg MULTI-PARAMETER DIGITAL MASS FLOW METERS User Manual

MULTI-PARAMETER DIGITAL MASS FLOW METERS

DFM

Multi-Parameter ﬂ ow meters provide accurate data on three different ﬂ uid parameters:

 ﬂ ow  pressure  temperature

The ﬂ ow rate can be displayed in volumetric ﬂ ow or mass ﬂ ow engineering units for standard or actual (temperature, pressure) conditions. Flow meters can be programmed locally by the four button keypad and LCD or remotely via RS-232/RS-485 interface.

DFM ﬂ ow meters support various functions including: ﬂ ow totalizer, ﬂ ow, temperature, pressure alarms, automatic zero adjustment, 2 relay outputs, 0-5 Vdc / 0-10 Vdc / 4-20 mA analog outputs for ﬂ ow, pressure and temperature.

DFM’s are offered either as Digital Mass Flow Meters, Model Numbers: DFM26, 36, & 46 or as a Digital Multi-Parameter Meters, Model Numbers, DFM27, 37 &

47. Model Numbers are displayed in Table 29.

THERE ARE 3 VOLTAGE (POWER) OPTIONS:

+15Vdc, 12Vdc, & 24Vdc.

Interface

All features of the ﬂ ow meter can be accessed via the local four button keypad and LCD. The digital interface operates via RS485 (optional RS-232 is available) and provides access to applicable internal data including: ﬂ ow, temperature, pressure reading, 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 0 to 10Vdc or 4 to 20 mA outputs for ﬂ ow, pressure and temperature (jumper selectable).

Auto Zero

The DFM supports automatic sensor zero offset adjustment which can be activated locally via the keypad or remotely via digital interface. The auto zero feature requires absolutely no ﬂ ow through the meter during auto zero 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 with respect to time. Both keypad menu and digital interface commands are provided to:

 Set the totalizer to ZERO.  Start the totalizer at a preset ﬂ ow.  Assign action at a preset total volume.  start/stop totalizing the ﬂ ow.  Read totalizer.

Totalizer conditions become true, when the totalizer reading and the “Stop at Total” volumes are equal.

Flow Alarm

High and Low gas ﬂ ow ALARM limits can be preprogrammed via keypad or remotely 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).

BULLETIN 20190115

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MULTI-PARAMETER DIGITAL MASS FLOW METERS

DFM

Pressure Alarm

High and Low gas pressure ALARM limits can be preprogrammed via the keypad or remotely via digital interface. Pressure alarm conditions become true when the current pressure reading is equal or higher than corresponding values of high pressure alarm settings or equal or lower than corresponding values of low pressure alarm settings. Alarm action can be assigned to activate the contact closer (separate for High and Low pressure alarm).

TABLE 34 - SPECIFICATIONS

ACCURACY:

CALIBRATIONS:

PRESSURE RANGE (MEASUREMENT):

PRESSURE ACCURACY: TEMPERATURE RANGE (MEASUREMENT):

TEMPERATURE ACCURACY:

REPEATABILITY:

RESPONSE TIME:

TEMPERATURE COEFFICIENT:

PRESSURE COEFFICIENT:

OPTIMUM GAS PRESSURE:

MAXIMUM GAS PRESSURE:

MAXIMUM BURST PRESSURE:

MAXIMUM PRESSURE DROP:

GAS and AMBIENT TEMP:

OUTPUT SIGNALS:

INPUT POWER:

**MATERIALS IN FLUID CONTACT:

CONNECTIONS:

DISPLAY:

CALIBRATION OPTIONS:

CE COMPLIANCE:

ENVIRONMENTAL (PER IEC 664):

±1% of FS at calibration temperature and pressure.

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

5 to 100 psia (0.34 to 6.8 bars). ±1% of FS. 32 °F to 122 °F (0 °C to 50 °C).

±1 °C.

±0.25% of full scale.

0.6 to 1.0 second to within ±2% of set ﬂ ow over 20% to 100% of full scale.

0.15% / °C or better.

0.01% of full scale/ 1 psi (0.07 bar) or better. 25 psig (1.73 bars).

DFM 26/36/46: 1000 psig (68 barg, 6895 kPag). DFM 27/37/47: 100 psia (6.8 barabs, 689 kPaabs).

DFM 26/36/46: 1000 psig (68 barg, 6895 kPag). DFM 27/37/47: 200 psig (13.6 barg, 1379 kPag).

See table 36.

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

Linear 0-5 Vdc (3000 ohms min load impedance); 0-10Vdc (6000 ohms min impedance); 4-20 mA optional (500 ohms max loop resistance). Maximum noise 20mV peak to peak.

May be conﬁ gured for three different options: ±15Vdc (±200 mA maximum); +12Vdc (300 mA maximum); +24Vdc (250 mA maximum); Circuit boards have built-in polarity reversal protection. Resettable fuses provide power input protection.

316 stainless steel, Viton

Model DFM26/27: Standard 1/4" compression ﬁ ttings. Optional: 6mm compression ﬁ ttings, 3/8" or 1/8" compression ﬁ ttings and 1/4" VCR

Model DFM36/37: Standard 1/4" compression ﬁ ttings. Optional: 6mm compression ﬁ ttings, 3/8" compression ﬁ ttings and 1/4" VCR

Model DFM46/47: Standard 3/8" compression ﬁ ttings.

128 x 64 graphic LCD with backlight (up to 8 lines of text).

Standard one 10 points NIST traceable calibration. Optional up to 9 additional calibrations may be ordered for an additional charge.

EN 55011 class 1, class B; EN50082-1.

Installation Level II; Pollution Degree II.

Temperature Alarm

High and Low gas temperature ALARM limits can be preprogrammed via the keypad or remotely via digital interface. Temperature alarm conditions become true when the current temperature reading is equal or higher than corresponding values of high temperature alarm settings or equal or lower than corresponding values of low temperature alarm settings. Alarm action can be assigned to activate the contact closer (separate for High and Low temperature alarm).

O-rings. Optional O-rings: Buna®, EPR and Kalrez®.

ﬁ ttings.

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

BULLETIN 20190115

WWW.AALBORG.COM - E-MAIL 쾷 : INFO@AALBORG.COM - PHONE  845.770.3000 - TOLL FREE IN U.S.A. AND CANADA 1.800.866.3837  ORANGEBURG N.Y. U.S.A.

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