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7.4
Operation in an explosive atmo-
sphere
Approval according to
ATEX
FM
CSA-Ex
7.5
Before switching on
7.6
Switch on and off
Installation and operating instructions Wilo-EMU TR/TRE 50-2 ... 120-1
Commissioning
o
o
o
o
o
o
o
−
o
Legend
− = not available/possible, o = optional, • = standard
For use in explosive atmospheres, the mixer must be marked as follows on the rating
plate:
▪ "Ex" symbol of the corresponding approval
▪ Ex classification
For the relevant requirements, refer to the explosion protection chapter in the ap-
pendix of these installation and operating instructions!
ATEX approval
The mixers are suitable for operation in potentially explosive atmospheres:
▪ Device group: II
▪ Category: 2, zone 1 and zone 2
Mixers must not be used in zone 0!
FM approval
The mixers are suitable for operation in potentially explosive atmospheres:
▪ Protection class: Explosionproof
▪ Category: Class I, Division 1
Notice: If the cabling is carried out according to Division 1, installation in Class I, Divi-
sion 2 is also permitted.
CSA Ex rating
The mixers are suitable for operation in potentially explosive atmospheres:
▪ Protection class: Explosion-proof
▪ Category: Class 1Division 1
Before activating the mixer, check the following points:
▪ Check whether the device has been installed properly and in accordance with the locally
applicable regulations:
– Has the mixer been earthed?
– Has the connection cable route been checked?
– Has electrical connection been made in accordance with regulations?
– Are mechanical components attached correctly?
▪ Check the operating conditions:
– Min./max. fluid temperature checked?
– Max. immersion depth checked?
– Intermittent operation: Max. switching frequency complied with?
▪ Check installation location/operating space:
– Has the minimum water level above the propeller been defined and monitored?
– Min. fluid temperature can drop below 3 °C: Monitoring device with automatic deac-
tivation installed?
– No installations within the direct rotary range of the propeller?
The mixer must switch on and off using a separate operating point (on/off switch,
switchgear) set by the customer.
During the start process, the rated current is exceeded for several seconds. Current
consumption continues to be slightly above the rated current until the operating tem-
perature of the motor is reached and the flow in the basin increases. During regular op-
o
o
o
o
o
o
−
o
o
en
o
o
o
o
o
o
o
−
o
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