Type A
PFH 1,9 x 10
-7
SFF 75,8%
MTBF 272946 h
λ tot 3664 fit
λD 1832 fit
λDU 886 fit
λDD 946 fit
MTTR 72 h
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.
27 Series 47K GB
7 Markings, Certificates, and Approvals
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