Datasheet

4. STANDARD TEST CONDITIONS AND SENSOR SPECIFICATIONS
Table TH Standard Test Conditions
The Standard conditions under which the TGS 8813 should be tested are illus-
trated in Table III.
We must stress the importante of adhering to these con-
ditions for several reasons.
For example,
if the Sensor is tested or evaluated
in very humid or dirty air,
or if the heater voltage value is not maintained
precisely,
then proper evaluation of actual Sensor characteristics tan not be
achieved and the accuracy that you require in your detectors will not occur.
We also suggest that you follow these guidelines in Order that the data you
receive from your testing will be in-line with the engineering data available
from FIGARO.
1. Atmospheric Condition
2
.
Circuit Condition:
Fresh air with 20°C 2 2°C and R.H.
65% f 5%
Basic measuring circuit
vc : lov + o.lv, VH
: 5.OOV + O.O5V, RL :4.OK - OHM 2 1%
3. Conditioning Time:
7 days or more
4. Test Gas:
Methane Gas
TABLE 19. SENSOR PERFORMANCE
1 HEATER RESISTANCE (RH) f 30Skt3Q
I
SENSOR RESISTANCE (Rs)
!+lSKQ
in Methane 1 OOOppm/air
RATIO OF RESISTANCE
Rs in Methane 3000ppmfair
1
RS in Methane lOOOppm/air
= 0.602 U.05
(6)