Electro-Chemical Devices (ECD) T80 - Manual (Page 52)

8.0 S80 SENSORS
S80 sensors are a family of digital sensors designed for use with ECD digital analyzers, the Model T80 transmitter
or the Model C80 controller. S80 sensors accept the standard ECD electrode cartridges. The S80 sensors convert
the analog signals into a temperature compensated digital protocol that allows two way communications with
the transmitter. The type of sensor, identity and serial number are stored in the sensor’s memory along with
three calibration registers. When connected to an ECD digital analyzer the sensor’s information is uploaded to
the analyzer configuring the displays and outputs to the values appropriate to the sensor’s measured parameter.
Connect an S80 pH sensor to a Model T80 Transmitter and the Transmitter configures itself into a calibrated pH
transmitter.
The internal components of the S80 sensors, the signal conditioner, temperature sensor and cable assembly are
epoxy encapsulated inside the ¾” O.D. housing. Epoxy encapsulation of the components increases the reliability
of the sensor by eliminating failures caused by wiring and connector breakage. The S80 sensors use the same
easily replaceable electrode cartridges as the S10 and S17 sensor assemblies.
8.1 S80 I
NSTALLATION
Four typical installation configurations are available for ECD sensors: insertion, immersion, flow-through and
valve-retraction. Although there are many ways to accomplish these mounting configurations, ECD recommends
the following installation configurations.
8.1.1 I
NSERTION
The S80 sensor is installed using a ¾” MNPT compression fitting with choice of nylon, Teflon or 316 SS ferrule.
The ¾” MNPT can be inserted into a pipe Tee or through a tank wall, the S80 is then inserted through the fitting
and compression gland is tightened to secure the sensor in place. The torque specification for the gland fitting is
20-ft/lbs. Over-tightening of the nut may swage the nylon or Teflon ferrules to the housing crushing the internal
sensor components.
8.1.2 I
MMERSION
The ¾” MNPT compression fitting is reversed and threaded into an extension/immersion pipe so the
compression gland is facing the measurement end of the sensor. Feed the cable through the immersion tube,
insert the S80 sensor at least 5” into the tube and tighten the sensor in place.
8.1.3 F
LOW THROUGH
Page 51 Model T80