Windmill Software

Data acquisition and control

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Special Offers

751: Multifunction Data Acquisition USB Unit

751 Multi-function USB Data Acquisition with Windmill Software: 16 analogue inputs, 32 digital i/o, 8 counters

Sale: Was 595 now just 295!

For 16 differential analogue inputs, 16 digital inputs/outputs and 8 counters. You can connect eight 751s to one PC. With the addition of suitable Microlink 59x conditioning units, you can also monitor thermocouples, strain gauges, pressure transducers and current. Includes Windmill data acquisition software for logging, charting, output control and direct data transfer to Excel.

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Measuring pH

751-pH: pH Measurement via PC's USB port

Sale: Was 1095 now just 795!

Monitor 12 pH probes. With digital I/O & counting. Expand to measure temperature, pressure, flow, level etc.

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Strain Gauge Monitoring

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

Sale: 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

Microlink 840: Versatile Data Logging over Ethernet and Internet

Microlink 840: Versatile data logging

The culmination of 30-years of experience designing data acquisition and control systems has resulted in this extremely versatile, compact unit which lets you monitor analogue transducers, digital sensors, utility meters, machines and digital status. It can also raise alarms and control digital outputs.

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Microlink 851-TC: Temperature Data Logger with Digital I/O

851-TC: Thermocouple and voltage data logger with digital I/O and counting

Data logger monitors 16 thermocouples or voltage signals, provides digital input and output, and frequncy and event counting. Communicates with PC over TCP/IP (eg Ethernet and Internet).

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750: Low Cost Measurement & Control

750 USB Data Acquistion with Windmill Software: analogue input, digital i/o, counters, free technical support

16 analogue inputs, 16 digital inputs/outputs, 8 counters and Windmill logging and control software: all for 150. Connect up to 8 units to a PC. Data saved in text files, or passed directly to Excel.

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Microlink 751: Multi-Function Data Acquisition and Control

DAQ Catalogue | Data Acquisition Hardware: USB |  Microlink 751: Multi-Function Data Acquisition and Control

751 Multi-function USB Data Acquisition with Windmill Software: 16 analogue inputs, 32 digital i/o, 8 counters

751 Multi-function USB Data Acquisition with Windmill Software: 16 analogue inputs, 32 digital i/o, 8 counters

Price: 295.00 (Excluding VAT at 20%)


Sale: Was 595 now just 295!

Data acquisition and control via the PC's USB port complete with fully featured Windmill Software and free technical support for life.


  • Measure temperature, strain, pressure, voltage and current through 16 analogue input channels
  • Switch up to 32 digital outputs
  • Monitor up to 32 digital inputs
  • Count events with up to 8 counters
  • Chop, change and mix configurations
  • Includes the powerful yet easy-to-use Windmill 7 Software for Windows: no programming required
  • Powered from the PC
  • Low power consumption
  • Connect up to eight 751s to one PC, giving 128 analogue inputs and 256 digital inputs and outputs
  • Choice of four analogue input ranges, selected with Windmill software individually for each channel
  • Alternatively, choose automatic ranging and let the software match the input signal as closely as possible
  • Integrating analogue-to-digital converter reduces electrical noise
  • Use Windmill software to select the resolution of the A-D converter (from 12- to 18-bits): choose high throughput or high resolution
  • Automatic recalibration
  • Comprehensive User Manual
  • Free technical support for life
  • Money-back guarantee if not completely satisfied

Digital Inputs and Outputs

The 751 provides 32 digital I/O lines, arranged in four groups of 8. Use Windmill to choose whether each group is an input or an output. You can read or set the state of each line individually, or switch several lines at the same time.


The 751 has eight 16-bit totalling counters. Each counter starts at zero and counts pulses to a maximum of 65535. You can reset a counter at any time from Windmill software. You can use the counters in two modes: accumulating count and resetting count. In accumulating count the counter keeps counting until you reset it. In resetting count the counter shows the number of pulses since the last reading.

You can scale counts using Windmill 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.

The counters are found on 8 of the digital input and output lines. You can use any of these you don't need for counting as normal digital inputs: the counts are always maintained even if you don't plan to use them.

Signal Connections

The slim 751 offers pin connections for your signals. However, if you prefer to use screw-terminals these are provided by adding one of the 59x Series of units. For analogue voltages, digital I/O and counters, choose the 590 unit. This allows many extra facilities, such as:

  • contact closure inputs
  • higher voltage inputs than normal
  • input protection from high voltages
  • external current source switching
  • output protection

For current, thermocouples, strain gauges and presssure transducers - choose the Microlink 590-8A, 593, and 594 respectively.

Measuring Temperature

Depending on your transducers, you might need extra hardware units to make your connections. For example, for thermocouples you will need a 593 box which provides cold junction measurement. (When monitoring thermocouples it is essential that the system knows the temperature of one of the thermocouple junctions. Housing this junction in the Microlink 593 isothermal box keeps the temperature constant, and a cold junction sensor in the box tells the system the temperature. You connect the thermocouple wires to screw terminals in the 593 isothermal box, and connect the terminals to the 751 unit with a ribbon cable. The 593 also detects broken thermocouple leads for you.)

Measuring Strain and Pressure

For strain add a 594 unit. This lets you monitor strain gauge bridges and balanced bridges such as pressure transducers. You can configure individual channels to accept any of these inputs:

  • voltage
  • quarter bridge: single strain gauge
  • half bridge: tensile + compressive strain gauge
  • half bridge: normal + transverse strain gauge
  • full bridge: 2 tensile + 2 compressive gauges
  • full bridge: 2 normal + 2 transverse gauges
  • full bridge: tensile normal + compressive normal + tensile transverse + compressive transverse gauge

Measuring Current

For current add a 590-8A to your shopping cart. This has many extra facilities, including:

  • contact closure inputs
  • higher voltage inputs than normal
  • input protection from high voltages
  • external current source switching
  • output protection

Measuring pH

For pH add a pH-box to your shopping cart. This lets you monitor 12 pH electrodes


The 751 is supplied with Windmill data acquisition and control software. This modular suite of software offers data logging, charting, alarm indication, output control and real-time data transfer to other applications like Excel. You can also add process mimic generators, sequence control and other options. Should you wish to program the 751 yourself, you can use the IML Tools to do so.

Windmill chart recorder and data logger

The Windmill Chart and Logger programs

Hardware Specifications

 Dimensions (mm)           180 x 120 x 40
Maximum length of cable 5 m
Maximum distance from PC can be increased by
use of USB hubs
Maximum # inputs 16 differential
Maximum safe input voltage:
Power supply on ±48 V
Power supply off ±33 V
Transient ±300 V
Ranges (V) ±0.01, ±0.1, ±1, ±10
Common mode range ±13 V
Relative accuracy of ranges:
gain = 1000 ±0.1%
gain = 1, 10, 100 ±0.05%
Analogue to Digital Converter:
Maximum linearity error ±0.02%
Resolution Integration Time Samples/Second
12 bits 2.5 msec 80
13 bits 5 msec 64
14 bits 10 msec 48
15 bits 20 msec 32
16 bits 40 msec 16
18 bits 160 msec 6
Maximum # inputs 32
Maximum # outputs 32
(selected through Windmill in ports of 8 lines)
Power-up state all inputs
Compatibility TTL and 5 V CMOS, can be made
contact closure compatible
Range 0 to 5 V
Output capability 15 LSTLL loads
Maximum I/O speed 160 channels per second
Resolution 16 bits
Compatibility TTL, 5 V CMOS, can be made
contact closure compatible
Input voltage range 0 to 5 V
Maximum count speed 160 counts per second

DAQ Catalogue | Data Acquisition Hardware: USB |  Microlink 751: Multi-Function Data Acquisition and Control