Campbell Scientific CS547A-L Conductivity/Temperature Probe and A547A Interface - Manual (Page 9)

CS547A Conductivity and Temperature Probe and A547 Interface
2.3 Temperature Sensor
Thermistor Betatherm 100K6A1.
Range 0 ° to 50°C.
Accuracy Error ±0.4 °C (See Section 8.2).
3. Installation
Rapid heating and cooling of the probe, such as leaving it
in the sun and then submersing it in a cold stream, may
cause irreparable damage. CAUTION
3.1 Site Selection
The EC sensor measures the EC of water inside the hole running through the
sensor, so detection of rapid changes in EC requires that the probe be flushed
continuously. This is easy to accommodate in a flowing stream by simply
orienting the sensor parallel to the direction of flow. In stilling wells and
ground wells, however, diffusion rate of ions limits the response time.
3.2 Mounting
The housing and sensor cable are made of water impervious, durable materials.
Care should be taken, however, to mount the probe where contact with
abrasives and moving objects will be avoided. Strain on cables can be
minimized by using a split mesh strain relief sleeve on the cable, which is
recommended for cables over 100 ft. The strain relief sleeve is available from
Campbell Scientific as part number 7421.
Because the CS547A has a slightly positive buoyancy, we recommend
securing the sensor to a fixed or retractable object or selecting the cable weight
option.
The A547 is usually mounted in the datalogger enclosure.
4. Wiring
The voltage excitation channel used for each EC
measurement must be separate from the one used for
temperature or measurement errors will result. If
multiple CS547A/A547s are to be wired to a single
logger, each conductivity excitation must be kept on a
separate, dedicated VX or EX channel, but you can
combine several temperature excitations lines onto a
single VX or EX port. WARNING
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