Datasheet

Revised 08/04
7
TECHNICAL INFORMATION FOR TGS2600
2-4 Gas response
Figure 11 shows the response pattern of the sensor
when inserted into and later removed from 10ppm
of hydrogen after a 3 minute period. The Y-axis
shows the ratio of sensor resistance over time (Rs)
compared with sensor resistance in clean air just prior
to insertion into hydrogen (Ro).
Figure 12 shows the response pattern of the sensor
when inserted into and later removed from 30ppm
of ethanol after a 3 minute period. The Y-axis shows
the ratio of sensor resistance over time (Rs) compared
with sensor resistance in clean air just prior to
insertion into ethanol (Ro).
As these charts display, the sensor’s response speed
to the presence of gas is extremely quick, and when
removed from gas, the sensor will recover back to its
original value in a short period of time.
Figure 13 shows the response pattern of the sensor
to the various gases found in cigarette smoke. The
Y-axis shows the ratio of sensor resistance over time
(Rs) compared with sensor resistance after 1 minute
in clean air (Ro). This data was taken in a 20m
3
room
with cigarettes placed on a flat surface. The burning
time for one cigarette was approximately 8 minutes.
This test consisted of the following sequence:
0- 1 min.: clean air (20˚C/65%RH)
1- 9 min.: first cigarette burning
9-14 min.: no ventilation
14-22 min.: second cigarette burning
22-27 min.: no ventilation
27-35 min.: third cigarette burning
(Note: Generally, the activation point for an air cleaner
would be around Rs/Ro=0.85, while the Rs/Ro for just
one cigarette is as low as 0.65).
This data demonstrates that TGS2600 is ideal for
usage in air cleaners designed to ventilate when
cigarette smoke and other air contaminants are
present.
Fig. 11 - Gas response to hydrogen
Fig. 12 - Gas response to ethanol
Fig. 13 - Response to cigarette smoke
0.1
1
10
0246810
Rs/Ro
Time (min.)
0.1
1
10
0246810
Rs/Ro
Time (min.)
0
1
10
0 5 10 15 20 25 30 35 40
Rs/Ro
Time (min.)
1 min.
9 min.
14 min.
22 min. 27 min.
35 min.