Servomex DF-130E, Operator'S Manual

Page: 23 / 88

Options DF-150E 19
7 Options
7.1 Stab-El 
The Stab-El  option can prevent trace levels of acid in the gas from
compromising the sensor. The maximum allowable levels of acid component in
the sample stream are the following:
Measuring Range CO
2
* SO
2
H
2
S NO
X
Cl
2
HCl
0-100 ppm 0.2 200 200 200 100 100
0-500 ppm 0.2 200 200 200 100 100
0-1000 ppm 0.4 500 500 500 200 200
0-5000 ppm 0.6 1000 1000 1000 400 400
0-10,000 ppm 0.8 1500 1500 1500 800 800
0-5% 2.0 2600 2600 2600 1400 1400
0-10% 4.0 4000 4000 4000 2000 2000
0-25% 6.0 6000 6000 6000 3000 3000
*Concentrations of CO
2
are in percent. One percent is equivalent to 10,000 ppm.
Table 2: Maximum Acid Gas Concentrations with Stab-El  (in ppm)
Contact Servomex for recommendations on using the Stab-El  sensor on acid
gases other than those listed above.
If the acid gas components in your gas exceed the limits in Table 2 several
approaches can be taken:
 An acid scrubber can be placed up stream of the analyzer to remove the
bulk of the acids, and the Stab-El
 option will allow the analyzer to cope
with the remaining trace levels.
 The analyzer duty cycle can be adjusted to limit its exposure to acids and to
allow the Stab-El
 option to “keep up”.
 A dilution system can be added to limit acid concentration.
 Consult Servomex for further recommendations.