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SAFETY INSTRUCTIONS IN ACCORDANCE WITH DIRECTIVE 2014/34/EU - J-OT-ST ATEX
EN – SAFETY INSTRUCTIONS IN ACCORDANCE WITH DIRECTIVE 2014/34/EU - J-OT-ST ATEX
7. TEMPERATURE CLASS
The temperature class of the pump varies according to the temperature of the pumped fluid, in accordance to what is shown in Table
2.
CAUTION If the user, following a process analysis, foresees the risk of exceeding the temperature limits shown in Table 2,
it is required to install
directive
2014/34/EU with minimum safety function performance equal to PL=c, category=2 in accordance with UNI EN
13849-1:2008 and calibrated according to Table 3.
If the temperature probe is installed, these temperature class instructions replace the values indicated in Table 2.
CAUTION The thermal compatibility between the pumped fluid and the pump materials must be checked: in
particular, for pumps that use NBR parts, the temperature of the pumped liquid must not exceed 90 °C.
CAUTION Fluid temperatures other than those shown in Table 2 do not allow compliance with the reference
temperature class in addition to causing damage to the pump.
CAUTION The temperature limiting device must be connected to a control panel. The connection must be carried
out by specialised personnel and in compliance with the regulations in force. The temperature limiting device that
Varisco can supply is a two-wire J-type thermocouple or a three-wire PT100
CAUTION In case of electric pumps, the temperature class of the entire pumping unit cannot be separated from the
motor temperature class. Therefore, the values shown in Tables 2 and 3 do not define the temperature class of the
entire pumping unit, but only of the individual pump.
CAUTION If the pump is equipped with a temperature probe at one of the support bearings (see Chap. 12), the pump
temperature class is also based on the calibration of this probe (see Table 4) and not only on the values shown in
Tables 2 and 3.
8. EQUIPOTENTIAL PROTECTION CIRCUIT
For the pumps of the JP range, the equipotential connection with the electric motor is guaranteed when the motor is assembled,
provided that care is taken to clean the surfaces of the coupling flanges from any impurities - and up to the white metal -.
For bare shaft pumps, the installer/integrator must complete the protective equipotential circuit by using the set-up on the support
foot (Fig. 2-C).
For electric pumps, the protective equipotential circuit is guaranteed by the manufacturer and the installer/integrator must perform
earthing. If the electric pump is assembled on a base (typical case of pump and motor connected by elastic joint, Fig. 2-D), the
installer/integrator must perform the earthing connection by using the appropriate terminal fixed to the base. If the electric pump
is of the monoblock type (typical case of pump connected directly to the electric motor by means of a coupling flange, Fig. 2-B),
the installer/integrator must perform the assembly earthing connection by considering the pump as a foreign mass according to
the definition provided by EN standard 60204-1.
CAUTION All the electrical connections on the pump and system must be performed in compliance with the
technical standards in force. The electrical system must be implemented by skilled personnel, in conformity to
the specific laws in force.
CAUTION The lack or incorrect execution of the equipotential protection circuit invalidates the safety and
protection requirements against the danger of
Check the efficiency of the earth connection every year.
Tab. 2
Temperature class
of the pump
T3
T4
T5
a temperature sensor near the seal (by connecting to the specific set-up point, Fig. 1), compliant with
Tab. 3
Temperature class
of the pump
T3
T4
T5
Pumped fluid temperature
85 °C ≤ T
< 100 °C
fluid
50 °C ≤ T
< 85 °C
fluid
−20 °C ≤ T
< 50 °C
fluid
Calibration temperature of the seal
zone probe
155 °C
90 °C
55 °C
explosion..
probe.
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