BÜNOx 2+
NOTICE
Controlling the solenoid valve
The bypass solenoid valve (for installed option only) is con-
trolled externally via plug X3, terminals X3.2 and X3.3, as well
as internally via the control menu.
5 Initial operation
Prior to initial operation, please verify
• hose connections are correct and tight,
• electrical connections are correct and undamaged,
• the converter is not operated outside the specifications,
• no parts on the converter have been removed,
• ambient parameters and gas inlet requirements are met.
• the unit has suitable upstream sample gas conditioning.
Do not put a damaged unit into operation.
Familiarise yourself with the BÜNOx 2+ menu structure, then
perform the following steps (please refer to the detailed de-
scriptions in the original operating instructions on the in-
cluded CD and online):
1.
Install the reactor cartridge.
2.
Switch on the unit.
▪ Units without solenoid valves will start in conversion
mode, units with solenoid valves (optional) will start
in bypass mode. The respective LED on the front panel
will light up.
▪ The display will show the software version installed
(e.g. d101).
3.
Until the target temperature has been reached, the tem-
perature and one of the following status messages will al-
ternate flashing:
Bypa: This message only appears on units with solenoid
valves (optional): bypass mode was configured manually,
continue with item 4.
cart: the converter cartridge has not yet been configured,
the unit is not yet heating, continue with item 5.
init: the converter cartridge is already configured, the
unit begins to heat, continue with item 6.
4.
Activate "Conversion Mode".
▪ Return to item 3.
5.
Select the cartridge.
▪ Return to item 3.
6.
To activate the calculator, set the parameters oFFS and/or
PPM and FLuu.
7.
Verify the sample gas conditioning is working correctly
and open the gas supply.
6 Operation and control
6.1 Normal mode
In normal mode the display will show the current converter
temperature. With the calculator activated the remaining
converter cartridge life will be displayed by pressing the ▼
key. Also use this button to advance the display to the next
parameter. This will briefly show the parameter type before
showing the value, e.g. “ch1“ for the temperature on the con-
verter, then “205°C“ as the current value.
Display text Meaning
ch1
Channel 1 / Converter temperature
CALC
Remaining cartridge life
Possible status messages
Only the highest priority status message will be displayed. The
chart lists messages in ascending order by priority
Status mes-
sage
Description
init
The unit is heating up after being switched on.
CALC
Remaining converter cartridge life exceeded.
cart
No converter cartridge selected. Specify the cart-
ridge as described in menu CALC, see chapter
Submenu NOx Calculator.
Bypa
The unit is in bypass mode (only applies with
"solenoid valves” option installed and when
manually invoking bypass mode).
Err
An equipment error has occurred, also see
chapter Service and repair.
Press the ▲ button to display the error codes.
Equipment status
The status in indicated on status output X1 as well as via three
LEDs at the front:
LED description
Colour Status
CONVERSION NO
2
→
NO
green
The BÜNOx 2+ is in conversion
mode. NO
2
is being converted to
NO
BYPASS
yellow The BÜNOx 2+ is in bypass mode.
Sample gas is being routed past
the converter
SERVICE
orange
• Advance warning on the re-
maining cartridge life expir-
ing (only applies if NOx cal-
culator enabled), also see
chapter Maintenance and
repair.
• No cartridge type defined.
6.2 Bypass mode
Bypass mode can only be used if the unit is equipped with op-
tion "solenoid valves". In this case, the unit is in this operating
mode during initialisation after being switched on and will
switch to conversion mode once the converter temperature
has been reached.
Bypass mode is also suitable for maintenance, e.g. when re-
placing the converter cartridge. Conversion mode is switched
to bypass mode either via the menu (dir → bypa) or externally
via the signal input.
14
Bühler Technologies GmbH
BX550019 ◦ 02/2020
