Bühler technologies BÜNOx 2+ Guía Rápida página 18

BÜNOx 2+
7 Maintenance
Always observe the applicable safety- and operating regula-
tions when performing any type of maintenance. Please refer
to the original operator's manual on the included CD or online
at www.buehler-technologies.com for maintenance informa-
tion.
8 Replacing the converter cartridge
DANGER
Equipment and converter cartridge surfaces will be hot
(up to 450 °C).
Touching the housing / converter cartridge may cause severe
burns.
a) Switch off the unit.
ð Since the fan is no longer running now, the temper-
ature of the unit/converter will initially continue to
rise!
b) Allow adequate time for the unit to cool down (at least 1
h)
c) Wear suitable safety gloves and protect the hot converter
cartridge from being touched.
Replace the converter cartridge when levels are below the re-
quired NO => NO conversion rate. The converter cartridge can
2
be replaced quickly without tools. We recommend switching
the unit off before replacing the cartridge and allowing it to
cool down adequately, at least 1 h. This will reduce the risk of
burns. However, the cartridge can generally also be replaced
with the unit heated.
Procedure for replacing the converter cartridge:
• Stop the sample gas supply (e.g. switch to bypass mode).
• Before opening the reactor closure, be sure there are no
toxic or hazardous gasses or components in the gas path
(e.g. first flush the gas path with inert gas or air).
• Turn the closure cap at the front of the device to the left
to the end of the thread.
• Carefully pull out the cover cap with converter cartridge.
• If necessary, allow the converter cartridge to cool down.
• Carefully pull the cartridge out of the cover piece (wear
safety gloves).
• Remove 2 x O-rings on the cover piece.
• Clean sealing surfaces.
• Lightly grease O-rings with high-temperature grease (O-
rings and grease included)
• Install O-rings on new converter cartridge and cover
piece.
• If necessary, remove grease residue from the cover piece
and the cartridge.
• Carefully slide the converter cartridge into the cover
piece.
• Carefully slide the cartridge into the reactor opening and
screw in the cover cap to the right to the end of the
thread.
18 Bühler Technologies GmbH
1
3 4
5
Fig. 3: BUENOx converter cartridge and cover piece with O-
rings
1 Cover piece
3 1 x O-ring Ø 38 mm
5 2 x O-ring Ø 27.5 mm
• Reset the NO calculator if enabled (menu: CALC → t.rSt)
x
A preheating time of 30 min is required after installing a new
converter cartridge to allow the cold cartridge to heat up to
the target temperature.
NOTICE
Contamination
Ensure cleanliness when replacing the reactor cartridge. Con-
tamination on the cartridge (e.g. due to grease) can e.g. result
in CO, CO being produced when restarting the unit.
2
We recommend flushing the reactor cartridge with inert gas
or air for a few minutes after restarting.
9 Service and Repair
Please refer to the original operator's manual on the included
CD or online at www.buehler-technologies.com for a detailed
description of the unit including information on
troubleshooting and repair.
9.1 Troubleshooting
If an error occurs, the display will read "Err". Press the "
button to show the error number(s).
Error messages will appear until the unit has been restarted
or the error is cleared using the "Func" button. It can only be
cleared if the cause for the error has been corrected.
Causes / Action: The following is a list of the most common
causes and actions for the respective error. If the actions listed
do not resolve the problem, please contact Service.
2
2 Reactor cartridge
4 1 x O-ring Ø 36 mm
"
BX550019 ◦ 02/2020