The 851-pH package comprises Windmill Software for Windows, a data logger to measure 12 pH probes and pH signal conditioning.
Price: 1195 GB pounds.
- Monitor 12 pH electrodes or probes, expandable to 16 on request.
- Can also monitor digital inputs, count, control digital outputs and measure temperature, pressure, flow, level, etc
- 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 pH signal as closely as possible
- 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 resolution for greater accuracy
- Automatic recalibration
- Set two alarms on each pH probe
- Free technical support for life and money-back guarantee if not satisfied
The 851-pH package comprises an 851 data logger, a pH connection box and Windmilll data acquisition software. Just connect your electrodes to the pH box's input protected sockets, plug the box into the 851 data logger and away you go. This method of connection means you can use the 851 Data Logger 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 on request.
Designed for Accuracy
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 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.
Set Alarms on Each pH Probe
You can set two alarm levels on each pH probe, 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-pH package. This modular suite offers data logging, charting, alarm indication, output control, process mimic generators, sequence control, programming tools and many other modules.
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
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