Operating instructions B-Series
Version 2.4, En Page 77 of 81 21-10-2005
13 safety devices.
Extra point(s) for attention with ATEX pumps.
Always assemble the correct safety devices for the correct ATEX environment.
Environmen
t
Type of sensor
Gas Ex II 2G T4
Dust Ex II 2D T4
13.1 Summary of safety devices to be used
The table below summarises when which safety devices must be used:
Safety device Paragraph
Category 2
(zones 1, 21)
Category 3
(zones 2, 22)
Temperature monitoring
In the intermediate
housing
13.2 Always Not required
Temperature monitoring
at the ball bearing
13.2 Only with not lifelong
lubricated greased bearings
that are not regularly
lubricated.
Only with not lifelong
lubricated greased bearings
that are not regularly
lubricated.
Coolant monitoring 13.3 Only when pumping volatile
liquid.
Not required
Overpressure protection 13.4 Only required when
pumping volatile liquid
and/or dangerous liquid.
Not required
Underpressure protection 13.5 Only when pumping volatile
liquid.
Not required
Safety devices E-motor 13.6 Always Always
Caution: safety control (drive) must suffice with regard to certain requirements. See paragraph
13.7
13.2 Temperature monitoring:
Assemble a temperature sensor (PT100) in the intermediate housing (Only with Cat. 2 pumps).
If applicable: assemble a temperature sensor (PT100) with not lifelong lubricated greased bearing if this is
not regularly lubricated.
The temperature sensor switches the pump off at the set temperature.
Set the sensor according to the table for the category:
Temperature
category.
Temperature. Safe sensor setting Maximum permissible liquid
temperature
T1
450
C 370
C 180
C
T2
300
C 230
C 180
C
T3
200
C 140
C 120
C
T4
135
C 80
C 65
C
The same temperatures apply for category 3, but no temperature sensor needs to be fitted in the
intermediate housing.
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