DURAG D-LX 721 - Page 62

7 | Installation and commissioning
62
D-LX 201/721
The flame monitor's protection type is only guaranteed when the cover and the plug-in
cover are both mounted. The flame monitor must not be operated when open.
D-LX…/M20 and D-LX…/NPT:
Use a suitable cable gland with a M20 x 1.5 or NPT ½"
thread, and with at least the temperature range of the flame monitor. Make sure that
the flame monitor's protection type is achieved. For explosion-proof devices, only ever
use suitable and approved cable glands.
The flame monitor can bridge interruptions in supply voltage of up to 20ms.
The position of fuse F1 is visible in the following figure:
WARNING
Fault message due to defective flame monitor!
Fuse F2 protects the relay for the flame ON signal. This fuse must only ever be
replaced by the manufacturer, followed by a functional test of the flame monitor. Only
then may the flame monitor be used again. Therefore:
▶ Do not replace fuse F2.
▶ Send the defective flame monitor to the manufacturer.
1
Fuse F1
2
Fuse F2
Fig.7.16: Position of the fuses
Fuse F1: MST 250; 0,5 A delayed action
In order to set the amplification characteristic and to replace the fuse, the cover will
need to be removed (
disconnect the flame monitor before starting work
). For
information on removing the cover, see section 7.4 Opening and closing the housing
[}55].