The Microlink 751-pH package comprises the Microlink 751 data acquisition unit, pH signal conditioning, Windmill measurement and control software and lifetime technical support.
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Just connect your electrodes to the pH box's input protected sockets, plug the box into the Microlink 751 and the Microlink into the computer's USB port. This method of connection means you can use the 751 to monitor, for example, temperatures, flow or level at the same time as pH
The standard pH package handles 12 pH electrodes, but can be expanded to 16 electrodes upon request.
The voltage produced by a change in pH is very small. A change of one pH unit on the pH scale produces (ideally) a change in voltage of 59.16 mV at 25 oC. With the 851-pH package you can choose a narrow input range such as ±10 mV or ±100 mV, or select autoranging to let the software automatically choose the best range for your measurements. Choosing the smallest range that encompasses your signals will optimise the resolution of the measurement.
You can also choose the resolution of the analogue-to-digital converter, selecting 18-bit for more accurate measurements. The higher resolution slows down the system to 6 samples per second, but as pH changes relatively slowly this is not generally a problem. If you need faster measurements, choose 16- or 15-bit resolution.
An integrating analogue-to-digital converter reduces internal noise and a differential amplifier helps reduce external noise.
To further improve accuracy, make sure you keep the wires between the electrodes and the pH box short - spanning not more than a few meters.
You can set two alarm levels on each pH probe, and specify what happens when alarm threshold is crossed. For example, an alarm could be sounded or other equipment switched on.
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.
Make your selections from Windmill software
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 SOFTWARE Operating system Windows 8, 7 64- and 32-bit Vista, XP, 2000 or 98 ANALOGUE INPUTS Maximum # inputs 16 differential Maximum safe input voltage: Power supply on ±48 V Power supply off ±33 V Transient ±300 V Amplifier: 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 DIGITAL INPUTS/OUTPUTS 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 COUNTERS 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
You can buy the Microlink 751-pH measurement package on-line from Windmill Software. If you need any more details please contact Biodata: e-mail email@example.com, telephone: +44 (0)161 834 6688 or tweet @MicrolinkUK. See also our article on How to measure pH for tips on accurate pH monitoring.