www.atestgaz.pl
1
Detected substances
Hot-wire sensors are used for measuring and detecting the presence of gases and vapor of combustible
substances e. g.:
hydrocarbons,
vapours of alcohol,
coal gas,
hydrogen.
2
Principle of operation
The Hot-wire gas sensor measures the gas concentration by changing the platinum wire resistance by
adsorbing gas on the surface of a metal oxide semiconductor. The sensor consists of a sensitive element and
a compensating element, which constitute two branches of the bridge. In the case of a flammable gas
exposure, the resistance of the sensitive element decreases and the output voltage of the bridge increases
in proportion to the gas concentration. The compensation element constitutes a reference and
compensates for the influence of temperature.
Figure 1: Compensating element construction
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.
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. 2/4
Appendix: PU-Z-033-ENG R02
•
Semiconductor
0,4 mm
Platinum wire
Summary of Contents for Sigma SmArt
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