GB
MSA MARKINGS, CERTIFICATES AND APPROVALS
Series 47K Gas Detector [SIL 2] 33
Special conditions for the safe use according to SIL 2
1. The application advice and limitations specified in this Manual have to be
considered. For calibration and maintenance, the regional and national
regulations have to be considered.
2. Applications with High Demand mode are only permitted with redundant
configuration. The Control Unit has to activate an alarm by a single sensor.
3. A defective sensor must be changed within 72 hours.
4. The safety related specifications for the MSA passive sensors Series 47K
are only valid when used in combination with certified MSA Controllers.
5. A minimum ambient Oxygen concentration of 10 vol% is necessary for the
correct operation of the combustible sensor.
6. The presence of any catalytic poisons has to be avoided for the combustible
sensor.
7. A functional check / calibration has to be done for the complete system
(Chapter 5).
8. A visual check has to be done monthly.
9. A system check has to be done every year.
10. Calibration and adjustment are part of the function / calibration check.
11. The target gas specified for the measurement has to be used for the test
gas. The concentration of the test gas has to be in the middle of the
measuring range.
12. Synthetic air has to be used for the zero gas.
13. An adjustment has to be done under the following conditions:
a) deviation of the zero > ±5% LEL
b) deviation of the sensitivity > ±20% of the test gas concentration
14. If the calibration is within the tolerances allowed, the calibration interval can
be doubled.
15. The maximum calibration interval allowed is 16 weeks.
16. The sensor has to be replaced if its sensitivity during operation is reduced to
less than 50% of the initial sensitivity.
17. After exposure to a gas concentration above the measuring range, the
sensor has to be immediately calibrated / adjusted, regardless of the preset
calibration interval. In the case of an adjustment, the sensitivity of the sensor
has to be rechecked again after 24 hours.
18. If the presence of any catalytic poisons which affect the correct sensor
operation cannot be avoided, the calibration interval has to be considerably
reduced.
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