• FLS 10/FLS
• Pump memory
• PT 100
• Thermal contacts
• VIS 10
Sensor type Description Measured value Fault values
Thermal contact The thermal contact is a
normally closed contact.
0-3 ohm, unless the wires are
very long.
An infinite value (open circuit)
indicates either high
temperature or a fault (a wire is
broken or there is a bad contact
in a connector).
Thermistor The thermistor is a
semiconductor device.
Resistance at normal
temperature:
• 50-100 ohm (150-300
ohm for three in a series).
• Above the tripping point,
T
Ref
, the resistance
increases dramatically to
several Kohm.
• An infinite value (open
circuit) indicates a fault (a
wire is broken or there is a
bad contact in a
connector).
• A value close to zero
indicates a short circuit in
the wiring.
Pt 100 sensor The Pt 100 sensor is a resistor
changing value almost linearly
with temperature.
Resistance:
• 100 ohm at 0ºC (32ºF)
• 107.79 ohm at room
temperature (20ºC, 68ºF)
• 138.5 ohm at 100ºC
(212ºF)
The resistance increases with
0.385 ohm for each degree
centigrade.
NOTICE:
Never connect the Pt 100
transducer to a voltage higher
than 2.5 V.
• An infinite value (open
circuit) indicates a fault (a
wire is broken or there is a
bad contact in a
connector).
• A value close to zero
indicates a short circuit in
the wiring.
Float switch (FLS) The float switches are leakage
sensors located in the
inspection chamber and in the
junction box.
Resistance. 2 sensor variants:
FLS:
• Normal: 1530 ohm
• Alarm: 330 ohm
FLS-10:
• Normal: 1200 ohm
• Alarm: 430 ohm
VIS 10 The vibration sensor located in
the junction box measures
vibrations in one direction. The
output is a 4-20 mA signal
proportional to the vibration
level.
Current, 4-20 mA > 20 mA
Installation
34 Flygt 3202 Installation, Operation, and Maintenance Manual
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