Monitoring equipment
The following applies to the monitoring equipment of the pump:
• Normally the stator incorporates thermal contacts connected in series that activates the
alarm at overtemperature.
• The thermal contacts open at 125°C (257°F).
• Ex-approved pumps must have thermal contacts connected to the control panel.
• The sensors must be connected to either the MiniCAS II monitoring unit or an
equivalent unit.
• The monitoring equipment must be of a design that makes automatic restart
impossible.
• The label in the junction box shows if the pump is equipped with optional sensors.
Optional sensors
Thermistor
Thermistors are optional sensors for measuring the temperature. They are
connected in series in the stator and activate the alarm at overtemperature.
The sensors are only optional for standard pumps.
NOTICE:
Thermistor must never be exposed to voltages higher than 2.5 V. If the
voltage exceeds this value, for example when the control circuit is tested, the
thermistors will be destroyed.
FLS FLS is a miniature float switch for detection of liquid in the stator housing. Due
to its design it is best suited for pumps in a vertical position. The FLS sensor is
installed in the bottom of the stator housing.
CLS CLS is a sensor for detection of water in the oil housing. The sensor initiates an
alarm when the oil contains approximately 35% water. The sensor is installed
in the bearing housing/bearing holder with its sensing part in the oil housing.
NOTICE:
The CLS sensor body is made of glass. Handle with care.
Two FLS sensors or one CLS and one FLS sensor can be used in the same pump,
connected in parallel.
Product Description
Flygt 3201 Installation, Operation, and Maintenance Manual 13
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