Table 4: Pt100 sensor
Description
Measured value
Fault values
The Pt100 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)
For resistance data between 0–160ºC
(32–320ºF), see
on
page 84.
> 200 ohm (approximate) can indicate
the following situations:
• Broken sensor
• Bad contact
• Broken lead
< 70 ohm (approximate) indicates:
• Short circuit
NOTICE:
Never connect the Pt100 transducer to a voltage higher than 2.5 V.
For information on the various configurations of contacts, thermistors and sensors that are
used to monitor stator winding temperature, see
Stator temperature monitoring methods
.
3.5.6 Pump current and power monitoring
Pump current
Pump current is an important parameter in itself, which the MAS 801 can also use to record
running time, number of starts and other operating diagnostics. This information is
fundamental for monitoring operation, maintenance planning, and fault diagnosis.
Pump current in one phase is standard with the MAS 801.
Pump current in three phases
Pump current in three phases is also possible with the MAS 801. To track pump current in
three phases with the MAS 801, the following are needed:
• Three current transformers in the control cabinet
• The PAN 312 power analyzer
The current transformers are connected to the PAN 312. The PAN 312 transmits the data to
the CU and the PEM in the MAS 801 system.
Power monitoring: PAN 312
The optional Flygt power analyzer PAN 312 allows the following parameters to be monitored:
• Three-phase power
• Power factor
• System voltage
• Voltage imbalance
• Pump current in three phases
• Current imbalance
3.6 Monitoring with MAS 711
The MAS 711 monitoring equipment can be used with pump models P7030, P7035, and
P7040, in applications with only one (1) motor cable. The motor cable must be screened.
Pumps with the standard MAS 711 equipment use a 12-lead auxiliary cable, plus 4 leads
from the motor cable, for the following:
• Thermal switches for stator temperature monitoring (three in series) or PTC thermistors
• Leakage sensor in the inspection chamber
• Leakage sensor in the junction box
• Analogue temperature sensor (Pt100) for main bearing temperature monitoring
• Analogue temperature sensor (Pt100) for stator winding temperature in one phase
• Vibration sensor VIS 10
3 Product Description
P7030, P7035, P7040 Installation, Operation, and Maintenance Manual
17
