Windmill Software Ltd. - PRODUCT NEWS

Strain Gauge Logger with internet connection

Windmill Software are pleased to launch the Microlink 851-SG Strain Data
Logger, which logs data from strain gauges over internet or Ethernet. It
can be used as a stand-alone data logger, or for real-time data
acquisition on a PC.

As well as strain, the data logger can monitor pressure transducers,
voltage signals and digital inputs, count; control digital outputs and
count up to 1 million events. With extra hardware it can also measure
temperature, flow, level, and other signals.

Windmill software makes the package very easy-to-use: no programming is
required. Automatic ranging lets the software match the strain signal as
closely as possible. Users can also select the resolution of the A-D
converter from 12- to 18-bits: choose between high resolution and high

Two alarms can be set on each signal input, again through the Windmill

Strain measurements are returned in microstrain, or in the engineering
units of your choice.

Windmill Software offer free technical support for life and money-back
guarantee if not satisfied.

With the 851-SG package you can 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

Strain gauges need an external excitation voltage to supply sufficient
current to keep all the bridge circuits energised. The 851-SG package
provides four sets of 16 screw terminals giving + and - excitation and
signals for each of 16 bridges. Two 1 kOhm termination resistors are
mounted in half bridge configuration whilst high quality 350 and 120 Ohm
resistors can be provided for the completion of quarter bridges.

When a bridge input is selected the Windmill software monitors
excitation voltage and performs the bridge calculation to produce a
reading in microstrain. This eliminates errors due to changes in
excitation voltage.

The initial unstrained bridge measurement is often much larger than the
change in signal due to strain. If this initial value is not accounted
for, it restricts the resolution you can obtain - i.e. the smallest
signal you can measure. Windmill software can zero or balance the
bridge, nulling the offset of the initial voltage. So instead of
measuring over a wide range, 0 to 0.5 V for example, you can choose a
narrow range such as 0 to 0.01 V.

Each range is divided into a fixed number of steps: the resolution. The
smaller the range and the larger the resolution, the more precise the
reading. The 751-SG offers a choice of resolutions from 12-bit for fast
sampling to 18-bit for greater precision.

The strain measurement package costs £775.

For more information, please contact :-

Windmill Software Ltd
PO Box 58, North District Office, Manchester M8 8QR UK
Tel: +44 (0)161 833 2782
Fax: +44 (0)161 833 2190

August 2013

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