3
72-910-24 Revision H
INTRODUCTION
The
MicroVision
microprocessor-based Boiler controller has been designed to monitor and control
Total Dissolved Solids (TDS) in terms of electrical conductivity measured in micro Siemens per
centimeter (uS/cm). A set point of the desired conductivity is entered into the controller through the
front panel. As this limit is exceeded, a blowdown valve is opened via an onboard control relay on
either a timed, continuous or sample and hold basis. The system’s water, with higher concentrations
of TDS, is drained from the system resulting in feed water being added, reducing the concentration
of TDS in the Boiler.
The
MicroVision
has five (5) output relays assigned as follows:
Relay 1 – Blowdown
Relay 2 – Timer #1
Relay 3 – Timer #2
Relay 4 – Timer #3
Relay 5 – Alarm or Timer #4 (normally open dry contact)
MICROVISION FEATURES
Output Relays
The control of the four HANDS – OFF – AUTO (HOA) output relays can be controlled using the HOA
menu.
RELAY STATUS
LED COLOR
ON (FORCED ON FOR 5 MIN.)
AMBER
OFF
RED
AUTOMATIC ‘ON’
GREEN
AUTOMATIC ‘OFF’
OFF
Inputs:
The MicroVision has 5 digital inputs that can be programmed as follows:
Programmable Inputs
Input 1
Input 2
Input 3
Input 4
Input 5
Drum Level
X (Timer 2)
X (Timer 3)
X (Timer 4)
X (Timer5)
Contacting Head Water Meter
X
X
X
X
X
Hall Effect Water Meter
X
Interlock
X
Drum Levels
When an input is defined as a drum level it is linked to the corresponding relay output. For example, if
input #2 is set as drum level, it will be linked to relay two and may be set by the user to either
deactivate the relay, or only to activate an alarm.
