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Digital Measuring Amplifier DMA2

Digital Measuring Amplifier DMA2

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Digital Measuring Amplifier DMA2

Product catalog summary

Special Features

Integrated display for actual force and parameters.
Simple operation using control panel buttons.
Calibration and zero adjustment via menu prompts.
Two voltage outputs (direct/filtered).
Display in percent or actual value (3½ digits).
Peak value storage.
Galvanically isolated power supply and signal outputs.

Design and Application

The DMA amplifier is designed for full bridge load cells and special web tension sensors. It can be mounted on a DIN rail or directly to a wall, offering a space-saving design that combines analog and digital electronics for fast signal processing without AD converter steps. The microprocessor controls zero adjustment and calculates calibration values automatically.

OEM Benefits

Pre-setting of amplification (selectable in the menu).
Plug-in terminal blocks for pre-wiring.
Zero adjustment and calibration via push buttons.
Display of actual force as a percent of nominal force or actual value.

Scope of Supply

The amplifier comes in a DIN Rail Mount enclosure with standard options including two voltage outputs and a 10V strain gauge excitation supply. Variants include options for current outputs and additional voltage outputs.

Variants and Options

Variant C: 1 current output (4…20 mA), 2 voltage outputs.
Variant N: 1 current output (0…20 mA), 2 voltage outputs.
Option E: Enlarged excitation supply (160 mA).
Option F: Use in potentially explosive atmospheres with safety barriers.
Option J: Strain gauge supply voltage 5V.
Option T: Front panel with steel bracket.
Option G2: Steel housing with door and viewing window.

Technical Data

Strain gauge excitation supply: 10V (option J: 5V), max current 60 mA (option E/F: 160 mA).
Zero adjustment compensation voltage: -25…0…+25 mV.
Total amplification adjustment range: 400…2800 V/V.
Factory adjustment at 1.5 mV/V: 667 V/V, at 1 mV/V: 1000 V/V, at 0.75 mV/V: 1333 V/V.
Signal output voltage: -10…0…+10 V, min. load resistance 5 kΩ.
Signal rising time: V2 direct 5 ms, V3 filtered 2 s.
Current output: Option C 4...20 mA, Option N 0...20 mA, max. load resistance 600 Ω.
Supply voltage: 24 V DC, ± 4 V, current consumption approx. 90 mA.
Enclosure protection: IP20.
Temperature range: 0…60°C.
Terminal cross-section: AWG 22-12.

Note: The auxiliary power V5 must be grounded, and a maximum current of 10 Amps should not be exceeded when using the power supply V5.

Catalog excerpts

Digital Measuring Amplifier DMA2 Scope of Supply Amplifier in DIN Rail Mount enclosure Standard (option U): 2 voltage outputs (direct / filtered), Strain gauge excitation supply 10 V Variants C: 1 current output 4…20 mA, 2 voltage outputs (direct / filtered), N: 1 current output 0…20 mA, 2 voltage outputs (direct / filtered) Additional Options E: Enlarged excitation supply 160 mA F: (Potentially explosive atmospheres): Use with safety barriers J: Strain gauge supply voltage 5 V T: Front panel incl. steel bracket G2: Steel housing with door and viewing window Special Features • Integrated display of actual force and parameters • Simple operation with control panel buttons • Calibration and zero adjust by menu prompts • 2 voltage outputs (direct / filtered) • Percent or actual value display (3½ digits) • Peak value storage • Power supply and signal outputs galvanically isolated The amplifier DMA is designed for full bridge load cells as well as special web tension sensors. In a cabinet it can be DIN rail mounted or directly to a wall. This space saving SMD components design combines the advantages of analog and digital electronics: height 300 mm width 200 mm depth 120 mm Fast signal processing without AD converter steps The microprocessor automatically controls zero adjust and calculates the calibration value Ordering example DMA2-U Type Variants/Options The DMA offers especially OEM´s substantial simplification of commissioning and service: - Pre-setting of amplification (to be selected in the MENU) - Plug-in terminal blocks designed for pre-wiring - Zero adjust and calibration by push buttons - Display of actual force (as percent of nominal force or actual value) Odering example option F: Indicate the total resistance from measuring chain for option F (e. g. 350 Ohm): DMA2-UF350 HAEHNE Elektronische Messgeräte GmbH · Heinrich-Hertz-Str. 29 · D-40699 Erkrath Germany · Telefon 0211/9 25 91-0 · Fax 0211/9 25 91-20 http://ww

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HAEHNE Technical Data Enclosure DIN rail mount enclosure with LED display (3^ -digits) Dimensions incl. plug-in terminal blocks: 55x 105 x 110 mm Four push buttons: MENU UP DOWN SET HAEHNE Elektronische Messgerate GmbH ■ Heinrich-Hertz-Str.29 ■ D-40699 Erkrath Germany ■ Telefon 0211/92591-0 ■ Fax 0211/92591-20 http://www.haehne.de Email: [email protected]

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Digital Measuring Amplifier DMA2

Digital Measuring Amplifier DMA2

Catalog excerpts

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