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3
Impact of environmental conditions
Never exceed the rated operating parameters of the detector. These parameters can be
found in the detector calibration certificate.
The detector must be used in accordance with the provisions in the User's Manual.
3.1.1
Impact of the presence of a working gas or other reaction gas
Some substances may polymerize on the lamp window under the influence of the radiation
generated by the UV lamp. This leads to a gradual decrease in sensitivity.
The persistent presence of high concentrations of the working gas leads to a loss of the sensor's
sensitivity. There are solutions available that significantly reduce this effect.
The photo-ionization sensor is not selective. It reacts to all substances with ionization energy
lower than the ones emitted by the lamp, e. g. 10.6 eV.
The oxygen content in the atmosphere does not damage the PID sensor – it can work at any
oxygen concentration. However, the value of oxygen concentration in the atmosphere has an
influence on the sensor's indication.
3.2
Influence of temperature
Temperature has an influence on the sensor's operation. In the case of specific requirements, this influence
can be compensated electronically.
3.3
Influence of moisture
During measurement, water vapour can absorb the emitted radiation, which results in lower sensor
sensitivity. This influence can be compensated electronically.
3.4
Influence of pressure
When there is no reaction gas in the atmosphere surrounding the sensor, pressure changes do not
cause a change in the sensor's indications (no effect on the sensor's "zero").
A change in the absolute pressure can cause changes in the sensor's indications during the
presence of the reaction gas in the atmosphere, due to the fact that the sensor sensitivity is
dependent on the partial pressure.
An appropriately high pressure impulse can damage the sensor.
3.5
Influence of vibrations, impacts
Vibrations and impacts affect the sensor's operation. They can cause primarily:
damage to sensitive parts of the sensor,
shift of the sensor's zero.
Atest-Gaz
A. M. Pachole sp. j.
ul. Spokojna 3, 44-109 Gliwice, Poland
VAT No.: PL 9691433231
tel.: +48 32 238 87 94
fax: +48 32 234 92 71
e-mail: [email protected]
p. 3/4
Appendix: PU-Z-034-ENG R02
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Summary of Contents for Sigma SmArt
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