CH-D3 Flammable Gas Sensors - Alphasense - #2

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CH-D3 Performance Data
Figure 2 Voltage Sensitivity
16
Figure 2 shows the variation in sensitivity caused by changes in pellistor voltage. The pellistor is relatively insensitive to small voltage variations at 3volts, avoiding in­dividual bridge voltage adjust­ments.
Data are taken from a typical batch of sensors.
14
cm
cri
> 10 <d 8
<d W
SS 2
0
1900
2100
2300
2500
Bridge voltage (V)
2700
2900
31 00
Figure 3 Zero Temperature Dependence
1-*04"j
i———- Wi
^^^^
-1-1-1-1-95-
Figure 3 shows the variation in output caused by changes in temperature, ex­pressed as % change, refer­enced to 20oC.
0
CO
lu _l
ro er
N
30
-30
-20
-10
0
10 20
Temperature (oC)
40
50
Figure 4 HMDS Poisoning
1.4
When exposed to 42ppm HMDS in 25% LEL methane, sensitivity loss is slower than equivalent pellistors.
1.2
1
C
If)
a
t
0.6
u p
t
u
o
0.4
0.2
0
0
1000
2000
4000 5000
Time (seconds)
6000
3000
7000
8000
9000
For further information on the performance of this sensor, on other sensors in the range or any other subject, please contact Alphasense Ltd. For Application Notes visit "www.alphasense.com".
In the interest of continued product improvement, we reserve the right to change design features and specifications without prior notification. The data contained in this document is for guidance only. Alphasense Ltd accepts no liability for any consequential losses, injury or damage resulting from the use of this document or the information contained within it ( ©ALPHASENSE LTD ) Doc. Ref. TDS/CHD3/Issue 12

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