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LDU 69.1 - High Precision - Approved

Load cell Digitizing Unit


LDU 69.1 provides digital data from weighing operations based on strain gauge load cells. It is pin and protocol compatible with other members of the LDU family, (68.1/68.2/ 68.3/78.1), thus offering a selection of precision levels, functionality and cost.
All LDU’s are designed to be embedded into customers’ equipment, to be plugged into a Unit Adaptor or integrated with a hosting device.

Product highlights

  • Supports any weighing or reference
    application, which requires precision
    beyond normal.
  • Offers extreme stability over time and
  • OIML R76 approved for non-automatic
    weighing to 0.1µV/VSI. Eases the MID
    approvals of R51, R61 and R107 applications.
  • Internal precision reference 2.000.0mV/V
    for mV/V calibration.
  • Eases the design of any digital device
    dealing with a load cell input.
  • Communicates via a RS 422/485 full duplex
    interface in 32 node networks or point to point.
  • A graphic presentation, analysis and set up
    PC program, DOP is available.

Product qualities

±20 bit (±1000000 counts) input signal resolution, 20 nV/count, 172 A/D conversions/sec.
Analog and digital filters offer IIR performance to be set in 6 LP frequency steps up to 3Hz and 60db/dec.
Display output and update performance at 5 updates/second, variable, rolling averaging.
Special pin-out ensures that neighbouring LDU’s synchronize their load cell excitation frequency.
7 points linearization performance.
Broadcast command enables up to 32 LDU’s to read their input in synchronization.
Can drive 250 ohm load cells, e.g. 4 pc, each 1000 ohm, at 5 Vdc.
Signal conditioning, zero and tare operations convert the load cell output into calibrated units (g; kg; lbs; etc.) as requested.
EMC compliance and surge protection provided by shielding and T-filters at all pins.
The secured I/Os and protected power input withstand excessive actions. Power supply range is 12-24 Vdc.
To be designed into customers’ PCB or bolted on the side a load cell.
Fits with a selection of Unit Adaptors, offering many I/O facilities and mounting options.
Certified to meet the EN45.501 requirements.

Download files

 Firmware: LDU 69.1

 LDU 69.1

 LDU 69.1 update description

 LDU 69.1 programmers manual

Related accessories

:: EC 20.135

:: EC 20.134

:: UA 77.1

:: UA 73.202

:: UA 73.201

:: UA 77.6

Related support

:: LDU 69.1 - Product sheet

:: LDU 69.1

Hauch & Bach - Femstykket 6 - DK-3540 Lynge - Denmark - Phone: +45 4816 0880 - Email: click here

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