Windmill Software

Data acquisition and control

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751: Multifunction Data Acquisition USB Unit

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

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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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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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. Connect up to 8 units to a PC. Data saved in text files, or passed directly to Excel.

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pH Data Logging over Ethernet and Internet

851-pH: pH Data Logger with Digital I/O and Counting

This package logs data from 12 pH probes. It comprises Windmill software, a pH data logger and pH signal conditioning. The pH probes connect to BNC sockets. You can read data over an Ethernet network.

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Thermocouple Monitoring

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

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

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Strain Gauge Monitoring

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

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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Microlink 851-TC: Thermocouple and Voltage Data Logger, Digital I/O, Counting

DAQ Catalogue | Data Acquisition Hardware: Ethernet and Internet |  Microlink 851-TC: Thermocouple and Voltage Data Logger, Digital I/O, Counting

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

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

Price: 890.00 (Excluding VAT at 20%)


The new Microlink themocouple data logger not only logs temperature but can also measure voltage, flow, level etc. Additionally, it provides digital I/O and event and frequency counting.
Price: 830 GB pounds.


  • Monitor 16 thermocouples or voltage signals
  • Built-in linearisation for B-, E-, J-, K-, N-, R-, S- and T-type thermocouples
  • Automatically detect broken thermocouple leads
  • With extra hardware also measure strain, current and pH
  • Read data over an Ethernet network or over the Internet
  • Includes the powerful yet easy-to-use Windmill Software for Windows: no programming required
  • Automatic ranging lets the software match the signals as closely as possible
  • Integrating analogue-to-digital converter reduces electrical noise
  • Use Windmill to select the resolution of the A-D converter from 12- to 18-bits: choose high resolution or high speed
  • Automatic recalibration
  • Set two alarms on each input
  • Use the 851-TC for real-time data acquisition on your PC or for stand-alone data logging
  • Free technical support for life and money-back guarantee

Themocouple Measurement

The system comprises a Microlink 851 measurement unit, an isothermal box, Windmill data acquisition and control software and technical support for life.

Connect the thermocouple wires to screw terminals in the Microlink isothermal box. This keeps the temperature of the thermocouple junctions constant, measured by a cold junction sensor in the box. Plug the isothermal box into the Microlink 851 using its ribbon cable. The isothermal box will also detect broken thermocouple leads for you. If you need more information on monitoring thermocouples, we have a tutorial on computerised themocouple measurement on our Data Acquisition Intelligence site, or contact our Technical Support Team.

Digital Inputs and Outputs

The 851 provides 32 digital I/O lines, arranged in four groups of 8. Use Windmill software 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 851 has eight counters which you can use for counting events or measuring frequency.

When counting events, you can use the counters in two modes: accumulating count and resetting count. In accumulating count the counter keeps going until you reset it from software. In resetting count the counter shows the number of pulses since the last reading.

When measuring frequency you can count over 1 or 10 second intervals.

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.

Set 2 alarm levels on each thermocouple

Set Alarms on Each Input

You can set two alarm levels on each input, and specify what happens when an alarm threshold is crossed. For example, an alarm could be sounded or other equipment switched on.


Windmill Software is included in the 851-TC package. This modular suite offers data logging, charting, alarm indication, output control and real-time links to other applications like Excel. You can also add process mimic generators, sequence control and many other modules. Should you wish to program the hardware yourself, you can use the IML Tools to do so.

Free Technical Support and Money-Back Guarantee

All our systems come with free technical support for life and a guarantee that if you aren't satisfied we'll give you your money back.


 Dimensions (mm)           180 x 120 x 40
Maximum logging speed 10 scans a second
Memory 65000 scans
Operating system Windows 10, 8, 7 64-bit, 7 32-bit
Vista, XP, 2000 or 98
Maximum # inputs 16 differential
Built-in linearisation for B-, E-, J-, K-, N-, R-, S- and T-type thermocouples
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
Maximum # counters 8
Resolution 23 bits
Maximum count (events) 1000000
Maximum frequency 5 kHz
Minimum pulse width 500 µseconds
Frequency gate times 1 or 10 seconds
Compatibility TTL, 5 V CMOS, can be made
contact closure compatible
Input voltage range 0 to 5 V

DAQ Catalogue | Data Acquisition Hardware: Ethernet and Internet |  Microlink 851-TC: Thermocouple and Voltage Data Logger, Digital I/O, Counting