72-900-06 Rev. F
Page 4 of 38
Introduction
The MicroVision
EX
microprocessor based cooling tower 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). Some models also include pH, and
ORP control. A set point of the desired value to control is entered into the controller
through the front panel. As this limit is exceeded, a valve, pump or other control device
is activated via an onboard control relay to adjust the reading being measured.
1. GENERAL WARNINGS
Symbol hereinafter and upon the unit means WARNING!
If the equipment is used in a manner not specified by the manufacture, the overall
safety may be impaired.
The plug is considered mains power. Disconnection means should be readily
identifiable and easily accessible to the operator after install
Adequately rated and APPROVED/CERTIFIED power supply cord and plug (supplied
by Pulsafeeder), or cable gland suitable for the applicable country is to be attached
and replaced by manufacturer’s authorized qualified person or as per applicable local
and national regulations
Controller is for indoor use only and not suitable for wet location. Controller housing
is IP65 compliant and may be configured as such.
Verify the mains supply ratings (e.g. Volts, Amps, and Hz) where the controller is to
be powered from and ratings of the accessories as well as ratings of the controller’s
receptacles/outlets before powering up.
2. MicroVision
EX
FEATURES
Toroidal Probe
MicroVision
EX
uses a toroidal probe for conductivity measurement. The
measurement is made by passing an AC current through a toroidal drive coil,
which induces a current in the electrolyte solution. This induced current in turn,
induces a current in a second toroidal coil, called the pick-up toroid. The amount
of current induced in the pick-up toroid is proportional to the solution conductivity.
Output Relays
The control of the HANDS – OFF – AUTO (HOA) output relays can be controlled using the
HOA menu.
ON (FORCED ON FOR 5 MIN.)
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