Microlink - Model 851 -Data Acquisition Device for pH and Current Measurement

• Analogue voltage measurement; can also measure strain, temperature, pressure, pH and current with extra units
• Rebalance all strain gauges in one go
• Read and switch digital inputs and outputs
• Event counting
• Frequency measurement
• Includes the powerful yet easy-to-use Windmill 7 Software for Windows: no programming required
• 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
• All data displayed and saved in the engineering units of your choice: volts, millivolts, Celcius, fahrenheit, microstrain, hertz, kilohertz, etc
• Free technical support for life
• Money-back guarantee if not completely satisfied

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.

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

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

Signal Connections

The slim 851 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 590unit. 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 594respectively.