OZONE MONITOR BMT 932 Manual, Rev. 02/2021
40
21
Maintenance
20.1 Replacement of UV Lamp and Scrubber
When the error message LAMP LOW or SCRUBBER is displayed the UV lamp or the utility
scrubber have to be replaced. The BMT 932 rack-mount instrument now has to be withdrawn
from the 19" rack after all tubings and cables have been disconnected. The upper shell of the
enclosure is held by four screws (black), two on each side. After removal of these screws the up-
per shell can be lifted upwards.
The UV lamp is located at the left end
(seen from the front panel) of the black
cuvette assembly. Remove both screws
holding the black lid
A
using the Allen
wrench clipped to the cuvette
E
. Lift up
lid
A
and remove the UV lamp as fol-
lows, the type of mounting depends on
the date of production:
Before autumn 2017
, the lamp is just
snapped into two elastic clips. Simply
pull it upwards to remove it.
After autumn 2017
the lamp is mounted
as shown on the right:
Caution:
The quartz glass tube of new UV lamp should not be touched. Use a soft cloth for
installing the new lamp! Finally replace the black L-shaped lid and insert and fasten both screws.
The UV lamp itself is held by two lamp holders
B
and
C
which are not identical.
Lamp holder
B
has a slot
L
, which holds the lamp wire by a grub screw
M
reaching into the slot.
The opposite lamp holder
C
has a plug-in contact, which in turn holds the UV lamp's wire.
Caution: Do not touch the grub screw on the lamp holder C !
Using the 1.5 mm Allen wrench (supplied with the lamp box), loos-
en the grub screw of the slotted lamp holder
B
only;
Grab the UV lamp
D
at the left end and carefully take it out of the
slotted lamp holder,
at the same time
pull the lamp out of the con-
tact in the opposite holder
C
Care must be taken to not bend the lamp's wire in holder C
Take the new UV lamp out of the box and note its serial number on
the box
Attention
:
Do not touch the radiating area
, or use textile gloves
First, carefully insert one end of the UV lamp into the contact in
holder
C
, and second, place the other end of the UV lamp into
slot
L
of holder
B
Turn the UV lamp until the exhaust nipple points away from cuvette
E
Now slightly tighten the grub screw in holder
B
: limit the force, by using two fingers, only
Holder
B
