72-910-02
REV. P
4
1. Introduction
Your microprocessor-based controller has been designed to monitor and control the conductivity of your
process water. The controller energizes two relay outputs based on a bleed and feed mode of operation.
-
When the conductivity measurement goes
above
the user defined set point, (2) two relays are
energized until the conductivity goes
below
the set point minus the fixed differential value.
The feed relay will also de-energize when the user programmable feed limit time is
reached.
-
Optional
- The feed control relay will energize based on a percentage of a 10 minute feed cycle.
Your controller may or may not have the following optional configurations:
Pigtails (pre-wired)
The controller is pre-wired with a power cord and drop down receptacles for plugging in control
devices such as a solenoid valve or a metering pump.
Flow Switch
The controller is supplied with a flow switch that is installed into the process flow line to signal
the controller that your system has water flowing. When there is a no flow state, the controller
will not energize the outputs.
2. Installation
2.1 Controller Location
Select a mounting location convenient to grounded electrical and plumbing connections. Mount the
controller on a wall or other vertical surface with adequate lighting at a comfortable level. Remove
the four screws that retain the front panel and remove it, mounting passages are located in each of
the four corners in the back of the enclosure (See page 15). Installation should comply with all
national, state and local codes.
Avoid locations where the controller would be subjected to extreme cold or heat
{less than 0°F (-17,8°C) or greater than 122°F (50°C)}, direct sunlight, vibration,
vapors, liquid spills or EMI (electromagnetic interference; e.g., strong radio
transmission and electric motors). The controller could be damaged and void the
warranty!
2.2 Sensor Installation
The controller is supplied with a temperature compensated conductivity sensor (probe). Install the
sensor at some point in your process where chemical and water are thoroughly mixed. If the sensor
is to be placed in a tank or sump, ensure that it is installed so that the black shrink-wrapped part of
the probe cable is not submerged. The probe should also be located in a position where adequate
flow is going across and through the probe.
