USER MANUAL NOVAcompact
MRU GmbH, D-74172 Neckarsulm
7.4. CO-limit (without purging)
If the CO limit value is exceeded, the color of the measured CO values changes (red).
7.5. CO purging (optional)
When the CO ppm limit is reached the analyzer will start the CO purging pump to protect the
CO sensor from getting saturated with CO. Other values will not be affected while the CO
sensor is being purged.
While the CO sensor is being purged the CO value is not displayed and dashes will appear on
the display. The dashes will remain red as long as the CO value is higher than the CO ppm
limit, and they will turn black once a level below the selected ppm value has been reached.
The purging does not stop automatically: it must be turned off by the user.
Press the “Folder” menu key and select “purge pump off” to cancel the CO purging function.
If during the flue gas measurement exceeded the configured CO-limit, the device activated the
purge function. Thus, the CO - sensor is protected before high CO - without that other
measured values are distorted.
7.6. CO/H2 and CO high (optional)
If that exceeds CO the CO threshold, then to CO high, the measured value is red indicated -
also the calculated values - is switched.
The CO value exceeds 10.000 ppm to % is in such a way switched (example 1.00%).
If the CO value sinks below the CO threshold, then the red CO value becomes again black
Starting from this moment the purge pump can be switched off over the menu key again.
7.7. Specific measurement applications
30 second average value calculation according to 1. BImSchV_2010
This function is available if you have received your unit with German configuration.
This option is started with the F3 button in the measuring window.
In the right bottom corner of the display the countdown from 30 to 0 will be displayed. Once the
countdown is completed the measurement will stop automatically.
The per 30 seconds determined loss Values will be market in the measurement print out.
Annular-gap measurement program
This program is used to find leaks in the double walled exhaust duct of condensing boilers. It is
done by measuring the O
2
value in the combustion air.
For this measurement MRU offers an annular gap probe (Part no. 56352) which can be
connected to the condensate separator of the analyzer.
Optional you can connect the annular gap probe with an adaptor (Part No. 11652) to the tip of
the probe pipe.
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