Servomex DF-130E, Operator'S Manual

Page: 43 / 88

Sample Gas and Plumbing Cautions DF-150E 39
NOTE
If the sensor remains on while exposed to oxygen concentrations
significantly higher that its range for prolonged periods of time,
(approximately one hour), permanent damage may occur.
To minimize the effects of oxygen shock and to protect the sensor during over
range exposures, turn the sensor off using the Sensor Off switch on the front
panel. (See Figure 4)
The installation of gas valves to block the process gas flow, and/or direct inert
gas flow to the sensor is highly recommended to minimize the possibility of
damage to the sensor under process upset or maintenance conditions.
8.6 Reactivity with KOH Electrolyte
Many process sample streams contain various concentrations of acid gases
which will react with the basic electrolyte. The sensor will not operate properly
if the electrolyte is neutralized by the presence of acidic gas species in the
background. For applications containing modest amounts of acid gases, the
STAB-EL sensor can be used See page 19 for details.