Schuch nD8611 L02 W Series Operating Instructions Manual page 9

5.3 Testing the restricted breathing
The test of the restricted breathing of the light fitting must be carried out after installation and at regular
intervals. For this purpose, the light fitting is provided with a Test port, which consists of an Ex cable
which is locked by a closing plug.
For testing, a negative pressure is to be generated in the light fitting via the Test port. Under constant
temperature conditions, the vacuum must exceed a predetermined minimum value after a specified
waiting time has elapsed.
According to EN/IEC 60079-15:2019, section 12.2.2.1.2, three test methods can be used:
Underpressure
at the beginning of the test
Waiting time
Minimum underpressure
after waiting time has elapsed
 After completing the test, make sure that the closing plug is inserted back into the Ex
! cable gland and the pressing screw is tightened properly (Torque see section 3,
Technical Data).
10/2022 L-01510-4-09
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Method 1 Method 2
3 kPa 0,3 kPa
(30 mbar) (3 mbar)
14 s 14 s
2,7 kPa 0,27 kPa
(27 mbar) (2,7 mbar)
9
Method 3
0,3 kPa
(3 mbar)
90 s
0,15 kPa
(1,5 mbar)