Amarex KRT series, Installation And Operating Manual, Page: 43 / 124

5 Installation at Site
43 of 124
Amarex KRT
Pump sets with vibration
sensors
A different wiring system is used for the electrodes of pump sets with vibration
sensors.
5.4.1.4.3 Mechanical seal leakage
Fig. 28: Float switch
The chamber for mechanical seal leakage is equipped with a float switch (core
identification 3 and 4). The contact (maximum 250 V~/2 A) opens when leakage is
detected in the leakage chamber. Opening of the contact shall trigger an alarm
signal.
5.4.1.4.4 Bearing temperature
The bearings of the pump set are equipped with bearing temperature sensors. The
two sensors are Pt100 resistance thermometers. They each have to be connected to a
temperature control device with a Pt100 input and 2 separate outputs for two
different switching points (sensor circuit maximum 6 V / 2 mA).
Set the following limits:
▪ Alert at 226 °F [130 °C]
▪
Cut-out of the pump set at 302 °F [150°C]
5.4.1.4.5 Vibrations
As an option, the pump set can be supplied with a vibration sensor in the area of the
upper bearing assembly. The sensor is matched to KSB's diagnosis systems.
The vibration sensor measures the root-mean-square value of the radial vibration
velocity at the upper bearing. The sensor has an integrated signal converter with a
standardized output (4 to 20 mA). This allows simple integration into existing PLC
systems or process control systems.
Table 25: Technical data of the sensor
Characteristic Value
Measuring range 4 - 20 mA at 0 - 0.79 in/s RMS [0 - 20 mm/s]
Measuring error < 5 %
Long-term stability +/- 1 % in 10 years
Max. shock load 1.1 lb [500 g]
Frequency range 2 Hz - 1000 Hz
Resonant frequency 18 kHz
Output impedance 200 Ohm max.
Voltage supply 18 - 30 V (smoothed)
Working resistance 50 - 100 Ohm