MSR ELECTRONIC PolyGard 2 MC2 - C: Semiconductor Sensor Element for Freon Gases, Ethylene and Ammonia

User Manual PolyGard
®
2 Sensors 2023-11 Page 32 | 40
C: Semiconductor Sensor Element for Freon Gases, Ethylene and Ammonia
SENSOR ELEMENT
Gas type and measuring range
See datasheet MC2/SC2_Freon, LFL or MC2/SC2_HL
Measuring principle
Semiconductor
Repeatability
< ± 20 % signal
Temperature range
-30 to +60 °C (-22 °F to 140 °F)
Humidity range
15–90 % RH (non-condensing)
Pressure range
90–110 kPa
Storage temperature range
1
0 °C to +50 °C (32 °F to 122 °F)
Storage time
2
Ca. 12 months
Service life
3
in air
> 5 years
Calibration interval
4
12 months
Poisoning
Semiconductor sensors can be poisoned by silicone-containing substances or
other catalyst poisons, up to complete loss of sensitivity. Their sensitivity is ir-
reversibly impaired by halogen-containing compounds.
Gas type
Ordering No.
Measuring range
Plastic housing
Stainless steel housing (SC2)
Relative gas density
5
t
90
time
Reaction time
t
90
time
Reaction time
SC2-/
MC2-X-
ppm
≤ sec.
≤ sec.
≤ sec.
≤ sec.
Air = 1
NH
3
S2125-C
1000
30
10
90
30
0.60
NH
3
S2125-F
10000
30
5
60
30
0.60
C
2
H
4
S2189-A
2000
10
5
-
-
0.97
FR02–08
S20XX-XX-A
2000
150 (R134a)
30
180
60
> 1.15
% LFL
S2020-01-A
50 % LEL
150
15
180
60
> 1.15
% LFL
S2020-02-A
50 % LEL
150
35
180
60
> 1.15
% LFL
S2020-03-A
50 % LEL
150
10
180
60
> 1.15
% LFL
S2020-04-A
50 % LEL
150
15
180
60
> 1.15
% LFL
S2020-05-A
50 % LEL
150
35
-
-
> 1.15
1
A deviating storage temperature can have a negative effect on sensitivity and service life
2
If stocked for a longer period, we recommend checking the zero point and recalibrating if necessary.
3
Expected service life for normal ambient conditions.
4
Manufacturer-recommended calibration intervals for normal ambient conditions.
5
The recommended mounting height depends on the relative gas density of the type of gas to be monitored. Depend-
ing on the relative gas density (d), the following recommendation therefore applies:
d ≤ 0.85: Mounting 0.3–0.5 m below the ceiling
0.85 < d < 1.15: Mounting at 1.2–1.8 m height
d ≥ 1.15: Mounting 0.3–0.5 m above the floor
Semiconductor sensors that have been exposed to an increased gas concentration (> ½ full scale
value) during normal measuring operation must be replaced without fail.