TGS2442 Datasheet, PDF (12/25 Pages) List of Unclassifed Manufacturers – Detection of Carbon Monoxide

TECHNICAL INFORMATION FOR TGS2442
4-5 Humidity test
Figure 19 shows the comparison of reference sensors
to those energized and exposed in an atmosphere of
52˚C and 95% RH for a period of 168 hours, returned
to normal air for 2 days, then followed by 168 hours
in 20˚C/15%RH as required by UL2034 Sec. 46A.1-
Humidity Test. As the test measurements taken after
the conclusion of the Humidity Test demonstrate,
sensors subjected to the test show influence by
humidity, but the sensor quickly returns to its normal
value.
4-6 Stability test
(1) False alarm test
To show the sensor’s behavior under continuous low
level exposure to CO, samples were tested against
the procedure detailed in UL2034, Sec. 41.1(c)-
Stability Test. Test samples were exposed to 30ppm
continuously for a period of 30 days under standard
circuit conditions. As this data demonstrates, false
alarming does not occur as a result of continuous low
level CO exposure.
(2) Temperature cycle test
In accordance with UL2034, Sec. 41.1(e)-Stability Test,
test samples were exposed to ten cycles (< 1 hr. and
> 15 min.) of temperature from 0˚C and 100%RH to
49˚C and 40%RH. As the three test measurements
taken after the conclusion of the test period
demonstrate, sensors subjected to the test show
negligible influence by temperature extremes.
100
10
52˚C/95%RH
20˚C/15%RH
CO 30ppm (ref)
CO 100ppm (ref)
CO 300ppm (ref)
CO 30ppm (test)
CO 100ppm (test)
CO 300ppm (test)
1
0.1
0
5
10
15
20
25
Time (days)
Figure 19 - Humidity test
(Ro = Rs in 100ppm of CO at Day 0)
CO 30ppm (ref)
CO 100ppm (ref)
CO 300ppm (ref)
CO 30ppm (test)
CO 100ppm (test)
10
CO 300ppm (test)
end test
1
start test
0.1
0
10
20
30
40
50
60
Time (days)
Figure 20 - False alarm test
(Ro = Rs in 100ppm of CO prior to test)
100
CO 30ppm (ref)
CO 100ppm (ref)
CO 300ppm (ref)
CO 30ppm (test)
CO 100ppm (test)
CO 300ppm (test)
10
Test
after 8 hrs.
1
Revised 03/00
0
1
2
3
4
5
6
7
8
Time (days)
Figure 21 - Temperature cycle test
(Ro = Rs in 100ppm of CO prior to test)
10