8 Maintenance and Calibration
22
7.3.
Remote Control
Switching the device to remote operation is done by connecting a digital HIGH-signal to pin 12 of
the interface connector 27). Remote operation is indicated by the green lighting remote control
LED 3). Switches and potentiometer on the front panel are inactive and all additional functions
are controlled by digital and analog signals listed in chapter 7.2.
The 25 pole D-Sub connector 26) is used for the remote control of the primary dilution unit. For
details plesase refer to the user manual of the testo MD19-3E Rotating Disk Diluter.
8
Maintenance and Calibration
8.1.
Evaporation Tube
Chemical compounds in the primary diluted measuring gas can be deposited on the inside
surface of the evaporation tube. Depending on their evaporation temperature they can be origin
of nucleation particles in the heating up process. As already recommended in chapter 6.2 such
artifact particles should be removed by feeding filtered particle free air through the primary diluter
when the temperature in the Evaporation Tube is increased to a higher set value and start the
measurement not before no particles are measured in the instrumentation.
The best procedure to clean the Evaporation Tube is to heat it up to the max. temperature of
400°C and feed filtered particle free air. Leave the temperature at 400°C until no particles are
detected by the instrumentation anymore. Depending on the degree of pollution this procedure
can last up to 60 minutes. Do this procedure before or after longer measuring programs.
8.2.
Parts with Limited Lifetime
Filter media and moving parts like air supply pumps inside the testo ASET15-1 have limited
lifetimes due to ambient air pollution and mechanical abrasion. Insufficient flows due to these
components are indicated by the testo MD19-3E air supply LED 7) and the secondary dilution air
supply LED 5).
If the testo MD19-3E air supply LED 7) remains red for longer than a few seconds after
the pump is switched on it indicates insufficient dilution air flow either caused by a testo
MD19-3E air supply pump defect or an overloaded testo MD19-3E air supply filter.
The testo MD19-3E air supply pump typically reaches 10'000...15'000 hours operating
time.
The secondary dilution air supply LED 5) remains red if the secondary dilution air flow is
not reached. This might be caused by a pump defect or overloaded secondary dilution air
filters.
The secondary dilution air pump reaches 5'000...10'000 hours operating time.
Pump maintenance and filter replacement should be done by Testo SE & Co. KGaA and/or an
instructed local service provider.
8.3.
Storage, Acclimatization
Fast ambient temperature changes may result in condensed water on and inside the instrument.
This may cause serious damage of electronic parts, e.g. the controller or safety devices.
Do not store the instrument outdoor, the storage environment must be clean and dry.
After long time storage or transport with cold ambient conditions or thermal fluctuation,
the instrument requires to adapt slowly to the local ambient conditions before starting up.
If condensed water has been formed, wait at least 12 hours before installation and
starting up.
Avoid mechanical damage and agitation.
Storage temperature range: -10°C to +60°C.
