INSTALLATION
Page 19
MANUAL
CT
Controllers
PLUMBING
Plumbing includes installation of the sensors and connection of
the chemical feeders or control valves.
Installation of Sensors
The CHEMTROL®
CT
Controller
can use many sensors
for measurement of water chemistry. For this discussion, we
will restrict that list to: conductivity, temperature, pH, ORP,
flow rate, pressure and water level:
- conductivity sensor for Total Dissolved Solids,
- potentiometric sensors for pH and ORP,
- thermistor for temperature,
- Hall effect pulse generator for flow rate,
- piezoelectric sensors for influent and effluent pressures,
- electro-optical water level sensor.
On small recirculation lines (2-inch pipe), the water chemistry
sensors (conductivity, pH, ORP and temperature) can be
installed directly on the main line using PVC reducing tees
(Figure 16).
On larger lines, the sensors should be mounted on a bypass
line, using either a Sample Line Assembly (Figure 17) or a
Sensor Cell Cabinet (Figure 8).
In-line Installation (2" Pipe)
Use only 2x2x3/4 in. SST reducing tees without reducers. Do
not install the sensors near an elbow or a constriction where
there might be excessive turbulence.
Install the tees on the suction side of the pump and make sure
that the tip of the sensor is oriented downward - as shown in
Figure - to avoid formation of air pockets near the tip. The
sensors should be readily accessible for servicing but not
exposed to physical damage.
After inserting the sensor, be careful not to overtighten the
compression fitting as it can crush the small glass tube inside
the sensor. Make it finger tight (no wrench).
Figure 16 - Sensor Tee
Sample Line Installation
The CHEMTROL® Bypass Line Assembly (P/N FSLYCT2)
shown in Figure is recommended for installation of the
sensors. It is designed to assure a smooth and reliable flow of
water. It includes:
- PVC tees (3/4" SST),
- Fast & Tite fittings (3/4" MPT),
- In-line Y-filter (3/4" MPT),
- On/off flow switch (3/4" FPT),
- Two Union Connections
-
Ball valve for water sampling and testing.
The Bypass Line Assembly should be installed exactly as
shown on Figure . In particular, make sure to install the
flowmeter in a vertical position and to install the flow switch
downstream of (after) the sensors to assure a smooth flow of
water near the sensors.
Figure 17 –
CT
Controller
Sample Line Assembly