DFM
6Pages

MULTI PARAMETER DIGITAL MASS FLOW METERS Multi Parameter flow meters provide accurate data on three different fluid parameters: n flow n pressure n temperature The flow rate can be displayed in volumetric flow or mass flow 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 flow meters support various functions including: flow totalizer, flow, temperature, pressure alarms, automatic zero adjustment, 2 relay outputs, 0-5 Vdc / 0-10 Vdc / 4-20 mA analog outputs for flow, 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 26. THERE ARE 3 VOLTAGE (POWER) OPTIONS: +15Vdc, 12Vdc, & 24Vdc. Totalizer The total volume of the gas is calculated by integrating the actual gas flow rate with respect to time. Both keypad menu and digital interface commands are provided to: All features of the flow 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: flow, 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 flow, pressure and temperature (jumper selectable). Auto Zero High and Low gas flow ALARM limits can be preprogrammed via keypad or remotely 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. Alarm action can be assigned with preset delay interval (0-3600 seconds) to activate the contact closer (separate for High and Low alarm). 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. Flow Alarm 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 flow through the meter during auto zero process. Provisions are made to either start, read, or save the current auto zero value via digital commands. 39 www.aalborg.com - e-mail ౧ info@aalborg.com - ( 845.770.3000 - fax 845.770.3010 - Toll Free in U.S.A. and Canada 1.800.866.3837

MULTI PARAMETER DIGITAL MASS FLOW METERS Pressure Alarm Temperature 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). High and Low gas temperature ALARM limits can be preprogrammed via the keypad or...

MULTI PARAMETER DIGITAL MASS FLOW METERS Engineering Units TABLE 24 - FLOW RANGES FOR DFM The measured gas flow and associated totalizer data are scaled directly in engineering units via the front panel keypad or digital interface. DFM 26 / 27 LOW FLOW MASS METERS CODE 01 Conversion Factors The DFM is capable of storing primary calibration data for up to 10 gases. This feature allows the same DFM to be calibrated for multiple gases while maintaining the rated accuracy on each. Multi-Gas Calibration %F.S., L/min, L/h, mL/min, mL/h, scuft/h, scuft/min, lb/h, lb/min, one user defined...

MULTI PARAMETER DIGITAL MASS FLOW METERS Multi Parameter Mass Flow Meter with Digital Signal Processing Multi-Drop Capability of up to 255 units (for RS-485 option). Stores calibration data for up to 10 different gases. Supports 10 different engineering units including user defined. Programmable 12 digits Totalizer indicates total gas volume. Flow Alarm limits for high and low gas flow with relay output. Pressure Alarm limits for high and low gas pressure with relay output. Temperature Alarm limits for high & low gas temp. with relay output. Four button keypad and large 128x64 graphical LCD...

MULTI PARAMETER DIGITAL MASS FLOW METERS 43 www.aalborg.com - e-mail ౧ info@aalborg.com - ( 845.770.3000 - fax 845.770.3010 - Toll Free in U.S.A. and Canada 1.800.866.3837 * FOR HIGH FLOW MASS FLOW METER

ORDERING INFORMATION MULTI PARAMETER DIGITAL MASS FLOW METERS MAX FLOW (N2) 10 L/min 50 L/min 100 L/min 10 L/min 50 L/min 100 L/min MATERIAL S Stainless Steel Viton® Buna® EPR PTFE / Kalrez® FITTINGS A 1/4" Compression B 1/8" Compression C 1/4" VCR® D 3/8" Compression H 6mm Compression DISPLAY L LCD readout POWER 2 12 Vdc 4 24 Vdc 5 +15 Vdc OUTPUT SIGNAL A 0-5 Vdc B 4-20 mA C 0-10 Vdc TEMP & PRESSURE OUTPUT SIGNAL (A only 26, 36, 46) **RS485 is standard. No cost optional RS232 is selected by changing the last digit of part number from 5 to 2. LABELS A Aalborg EXAMPLE: DFM36S-VAL5-AA5 50...