DigiTemp User Manual
Chapter 1 Operation
page 6
1.1
General description
The FTS DigiTemp Submersible Temperature Sensor is simple, compact, rugged SDI-12 device that measures
temperature of water or soil. The DigiTemp is extremely simple to use: it needs absolutely no configuration in
most applications, and it returns measured temperatures in both degrees Celsius and degrees Fahrenheit. It is
accurate to 0.2 °C over a temperature range of -5 °C to +45 °C.
The FTS DigiTemp consists of a thermistor sensing element connected to a microcontroller unit that processes
the thermistor resistance into a temperature value and communicates with the data collection platform using
the SDI-12 protocol. The data collection platform requests measurements by sending commands to the
DigiTemp.
Figure 1-1: FTS DigiTemp sensor
1.2
Installation
The DigiTemp is easy to install. Follow these steps:
1.
Place the sensor in a location where it is continuously immersed in a representative sample of the water
to be monitored (usually a well-mixed locale).
2.
The sensor may be mounted on an object or armature, or it may be suspended by its cable with an
anchor (do not exceed a cable tension of 5 kg / 11 lb). Sensor and cable dimensions enable it to be
deployed through standard 1-inch PVC conduit with 8-inch factory bends.
3.
Secure the sensor cable to the mounting structure to prevent cable chafing.
4.
Route the cable safely to the data collection device.
5.
If a connector is used, plug the connector into the connector port on the data collection device.
If a terminal block is used, refer to section 1.3 below for wire colour and function.
60’ flexible cable is durable,
watertight, and UV-resistant
Delrin™ housing provides high strength
and stiffness for durability, low friction
for easy deployment through conduits.
Strain relief protects cable.
Strong molded end loop for
attaching weights or helping
fish through conduit. ¼”
diameter hole
Watertight construction.
