MR MESSKO, Operating Instructions Manual, Page: 10 / 12

BA 3208538/00 10
A discolouration in the detector tube for carbon monoxide
from white to green to brown indicates the presence of
carbon monoxide.
If fault gases have been detected, it is urgently recommended
to carry out an extensive examination of the transformer or
to carry out a qualitative analysis.
(6) Close the gas withdrawal valve again, carefully remove
the detector tubes and unscrew the Y-connector. Screw the
sealing cap (Fig. 1/1) back onto the gas withdrawal valve.
(7) If necessary, re-establish the gas sampler’s operational
readiness (see BA 3178923 section 4.1 and section 4.2).
3.2 Using the MESSKO
®
Gas Quick Test directly on
the MSafe Buchholz relay
(1) Unscrew the sealing cap (Fig. 3/2) from the gas withdra-
wal valve (Fig. 3/1).
(2) Screw the Y-connector (Fig. 3/3) onto the gas withdra-
wal valve (Fig. 3/1).
(3) Cut open the detector tubes for the carbon monoxide
and hydrogen analysis on both sides using the tube opener
(see Fig. 2) and insert into the Y-connector (Fig. 3/3). The
arrow on the detector tube indicates the gas flow direction.
If the test is only being carried out to verify the presence of a
fault gas, the unused outlet of the Y-connector can be sealed
off using the sealing plug provided.
(4) Open the gas withdrawal valve (Fig. 3/1) so that the
gases can be routed out of the MSafe Buchholz relay through
the detector tubes. The necessary pressure for this inside the
NOTE
In the case of carbon monoxide, there may be a small
amount of smoke formation on escaping from the
detector tube.
CAUTION
Carbon monoxide is an indicator of problems in paper
insulation.
Buchholz relay must be > 0.5 bar. Observe the rising oil level
in the inspection window of the Buchholz relay and close the
ACHTUNG
Carefully cut open the detector tubes and cautiously
insert them into the Y-connector. There is a risk of injury
due to cuts.
WARNUNG
Risk of explosion and risk of flammable and toxic gases!
In the event of an error, gases in the MESSKO® Buchholz
relay may form an explosive gas mixture in connection with
air. Smoking or work involving sparks is prohibited in the
hazard area!
Avoid breathing in any gases escaping as they may be toxic.
Hydrogen Carbon monoxide
Fig 3
(3) Y-connector
(4) Detector tubes
(1) Gas
withdrawal
valve
Gas flow
(2) Sealing
cap
MESSKO® MSafe® Buchholz relay
CAUTION
Hydrogen is an indicator of thermal and / or energy
error.