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-pH: pH Measurement over USB

DAQ Catalogue | Data Acquisition Hardware: USB |  Microlink 751-pH: pH Measurement over USB

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

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

Price: 795.00 (Excluding VAT at 20%)


Sale: Was 1095 now just 795!

The 751-pH package comprises Windmill Software for Windows, a USB unit to measure 12 pH channels and signal conditioning. Connect 8 units to 1 PC to monitor up to 96 pH probes.

Note, this package is not suitable for interfacing pH meters. For pH meters choose our Windmill + COMIML serial driver package, for just 50 pounds.


  • Monitor 12 pH electrodes or probes.
  • Includes the powerful yet easy-to-use Windmill Software for Windows: no programming required
  • Connect up to 8 units to one PC
  • Connects over USB
  • Choice of four analogue input ranges
  • Integrating analogue-to-digital converter reduces electrical noise
  • Use software to select the resolution of the A-D converter from 12- to 18-bits: choose high throughput or high resolution
  • Set two alarms on each pH probe
  • Can also measure temperature, strain, pressure etc (with extra hardware)
  • Automatic recalibration
  • Comprehensive User Manual
  • Free technical support for life and money-back guarantee if not satisfied

pH Measurement

The 751-pH package includes a pH connection box. Just connect your electrodes to this box's input protected sockets, plug the box into the 751 measuring unit and away you go. This method of connection means you can use the same 751 measuring unit to monitor, for example, temperatures.


Windmill Software is included in the 751-pH 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.

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
No pH probe inputs 12, expandable to 16 on request
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-pH: pH Measurement over USB