Windmill Software

Data acquisition and control

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Special Offers

Thermocouple Monitoring

Thermocouple measurement over USB, Windmill 7 software & free technical support

Was £730 now just £360!

Monitor 16 thermocouples and voltages, digital I/O and counting. Connect 8 units to 1 PC and monitor 128 thermocouples.

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Test Sequence Control

Windmill Test Sequence: sequence control software

Was £195 now just £50!
Automate measurement and control tasks using a sequence of commands: for PID control, alarm monitoring, control signals, etc.

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Strain Gauge Monitoring

Strain Measurement:  USB Data Acquisition Unit, Strain Gauge Connection Box, Windmill Software, free technical support

Was £775 now just £475!

Monitor 16 strain gauges, balanced bridges like pressure transducers or voltage signals. Connect 8 units to 1 PC and monitor 128 strain gauges. Readings in microstrain. Zero reference level can be set in Windmill software. Plus digital input & output and counting.

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Best Sellers

Windmill + COMIML Serial Driver

Windmill 7 Data Acquisition Software + COMIML Serial Driver

Was £145 now just £50!

Collect data from 10 instruments via TCP/IP, RS232, RS485, Modbus, RS422. Save data in text files or send directly to Excel. Includes Logger, Chart and Control applications, and software to troubleshoot COM port communications. For a multitude of devices including laboratory balances, GPS, digital indicators, PICs...

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Enhanced Windmill

Enhanced Windmill

Get ALL the Windmill data acquisition and control programs and drivers for just £295!

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752-RTD: Temperature Measurement

752-RTD Resistance Temperature Measurement over USB, Digital I/O, Counting, Analogue Output,  free technical support, money-back guarantee

The USB unit provides differential inputs to monitor up to 8 RTDs or Pt100 probes, and up to 16 voltage signals. You can connect 8 USB units to 1 PC. The units also provide digital input and output, counting, and voltage or current output.

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Microlink 840: Versatile Data Logging

DAQ Catalogue | Data Acquisition Hardware: Ethernet and Internet |  Microlink 840: Versatile Data Logging

Microlink 840: Versatile data logging

Microlink 840: Versatile data logging

Price: £295.00 (Excluding VAT at 20%)


The culmination of 30-years of experience designing data acquisition and control systems has resulted in this extremely versatile unit. The Microlink 840 lets you perform a multitude of data acquisition and control tasks, all in one small box. You can use it anywhere on an Ethernet network or over the internet.

The Microlink 840 has 8 hardware inputs, each of which can:

  1. Monitor Digital Sensors, including
    • flow meters
  2. Monitor Utility Meters, including
    • Electricity meters
    • Gas meters
    • Water meters
  3. Monitor machines, for instance
    • Record percentage on/off times
    • Count items produced
  4. Monitor digital status, for instance
  5. Monitor analogue transducers, including
    • pressure
    • temperature
    • force
    • voltage
    • 4-20 mA current

You can also use the Microlink 840 to:

  1. Control digital outputs
  2. Raise alarms
    • Alarm on analogue level, on-off state or count
    • Set two alarms on a combination of channels
    • Switch a digital output on alarm, sounding a buzzer or turning on a light for example
    • Notify alarms to a remote PC over Ethernet or Internet
    • Insert a delay before an alarm is triggered, helping prevent false alarms

Utility Meter Monitoring

Log data from gas, electricity and water meters and send the consumption readings to a central PC running Windows. The Microlink 840 lets you monitor demand in real-time and identify patterns of use.

  • Data files can be read by Excel, Energy Lens, and other software
  • Continuous monitoring, logging and display using Windows software.
  • See consumption in real-time
  • Record total usage and usage over your chosen set intervals, for example each hour's or day's demand
  • Alarm indication on all readings - set thresholds above or below which alarms are triggered and logged
  • Each Microlink 840 can monitor 8 meters
  • Maximum count of over 16 million
  • All data is time-stamped
  • Choose custom engineering units through software, scaling readings into the required units: kilowatt-hours or cubic meters for example
  • Log the counts from the volt-free contacts of your utility meters
  • Works with any meter emitting contact closure pulses
Data can be passed to other software such as Excel spreadsheets, databases and energy management software.


The Microlink 840 offers many counting options:

  • Accumulating counter, eg for utility meter monitoring
  • Frequency counter which measures counts per second, eg for determining the rate of power consumption
  • Period counter which measures the time for a number of cycles to occur, eg for calculating the speed of a conveyor belt
  • Pulse width counter, eg for measuring the duration of an event
  • Elapsed time counter, eg for recording the length of time that a machine is on
  • 16-bit or 32-bit counting: 16-bit allows counting up to 65000; 32-bit allows counting to over 16 million.
  • Set a scale and offset factor to the count from software. For example if the pulses came from a flow meter which produced one pulse for every 50 millilitres, a scale factor of 0.05 would give a reading in litres.

Logged Data

Data can be saved in text files, xml files, Energy Lens files and to a MySQL database over Ethernet or Internet. You can also automatically e-mail data and reports, and send data to other applications like Word or Excel.

For each channel you can store...

  • Maximum value over the logging interval
  • Minimum value over the logging interval
  • Average value over the logging interval
  • Final value of the logging interval
  • Custom calculations on saved data

More Information

For more details please get in touch. You can also download the Data Logger leaflet or Microlink 840 Manual.

DAQ Catalogue | Data Acquisition Hardware: Ethernet and Internet |  Microlink 840: Versatile Data Logging