Siemens NXAIR M - Overpressure Sensors (Optional), Function Test

Service information
139-2021.9 / 07 NXAIR M 245
25.6 Overpressure sensors (optional), function test
Depending on the panel version, overpressure monitors for the individual compartments are located in the
low-voltage compartment. To check proper functioning of the overpressure monitors, use the test unit from
the accessories.
DANGER
Maloperation
The function test at the overpressure monitors may be performed during running
operation.
Obtain release for the planned test of the overpressure monitors.
Coordinate the procedure with operational activities.
Ensure uninterrupted communication with the operator at the central
control.
Always perform the function test on one overpressure monitor only, and
complete it. Test several overpressure monitors one after the other.
Test unit
To perform the function test of the overpressure monitors, a test unit is available as an accessory. The test
unit enables the function test of every single overpressure monitor.
Fig. 402: Test unit
Preconditions
 High-voltage door closed
 Release for checking the overpressure monitors available
 Trouble-free communication established with the operator at the central control
 Door to low-voltage compartment open
 Test unit available, locking cap firmly screwed on
(1)
Manometer
(2)
Test tube
(3)
Lab bottle made
of polyethylene
(4)
Locking cap
2
1
3
4