SITA Messtechnik GmbH – Operating Instructions SITA ConSpector
10 FAQ / Frequently asked questions
How does ambient light affect the measurement?
The SITA ConSpector automatically compensates for the ambient light by measuring both the am-
bient light and the radiation emitted by the fluorescence. Excessive ambient light can result in an
overload of the detector diode (Warning on device: Ambient light!). Fast changes in the light con-
ditions, for example by switching on ceiling lights or fluctuating shade during a measurement can
cause measurement deviations. Fast changes in light during a measurement should therefore be
avoided. Therefore, it is recommended to measure in a stainless steel beaker with a closed lid. If
the SITA ConSpector detects changes in ambient light, it issues the warning "Ambient light fluctu-
ates". In this case it is recommended to improve the measuring conditions/ambient light conditions
(measurement in a stainless steel beaker with closed lid) and to repeat the measurement.
How often should the SITA ConSpector be calibrated?
Regular testing as a blank measurement is recommended (section 8.1). In addition, a reminder
after a maximum time interval between two checks can be set in the device. In the default setting,
the SITA ConSpector issues a warning "Test required" 40 days after the last test. This is not a
generally valid recommendation, but should be shortened or extended depending on the frequency
of use, the operating environment and the requirements of the measuring task.
In addition, it is recommended to have the SITA ConSpector and the optionally associated stand-
ards serviced and adjusted by the manufacturer every 1 - 2 years as part of the monitoring of the
measuring equipment.
Why is the measurement with the SITA ConSpector performed in stainless steel beakers?
The material of glass and plastic vessels can itself fluoresce and influence the measurement. When
measuring in the stainless steel beakers, this is excluded and additionally the ambient light is
shielded. Glass and plastic vessels can be tested for their influence on the measurement result by
means of an blank measurement or test as blank measurement.
Can the measurement with the SITA ConSpector be automated?
The SITA ConSpector is designed as a hand-held measuring device. The SITA clean line BC is
used for fully automatic bath control.
What types of contamination can be detected/cannot be detected with the SITA ConSpector?
In production aids, fluorescence is largely due to the aromatic ring systems contained as additives
and the unsaturated structures of the oils and fats. Carboxylic acids and their esters as well as
aliphatic ketones also fluoresce. With fluorescence measurement, the smallest amounts of fluores-
cent substances can be detected.
Processing aids such as oils, greases, cooling lubricants and separating agents are technical liquids
which, in addition to the basic substances, also have a large number of additives which can also
contribute to fluorescence. Detailed information on the fluorescence of contamination can be
found in chapter 2.1.
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