MSR ELECTRONIC PolyGard 2 MC2 - Page 34

User Manual PolyGard
®
2 Sensors 2023-11 Page 34 | 40
Sensor Element SC2/MC2 Methane/Propane/Carbon Dioxide
SENSOR ELEMENT
Gas type and measuring range
See datasheet DB_SC2/MC2_IR
Measuring principle
Infrared (NDIR)
Repeatability
< ± 5 % signal
t
90
time (plastic housing)
90 s
Drift in air
n.d.
Pressure range
90–110 kPa (influence + 1.6 % on measured value per kPa)
Storage temperature range
1
See temperature range (next table)
Storage time
2
Ca. 6 months
Poisoning
IR sensors can show signs of poisoning due to contamination with oils and lubri-
cants.
Gas type
Ordering No.
Measuring range
Display resolution
Accuracy
Reaction time
Zero-point variation
Temperature range
Humidity range (non
-
condensing)
Life time
3
in air
Relative Gas density
4
Calibration interval
5
SC2-/
MC2-X-
%
± %
sig.
≤ sec.
± %
LEL
°C
% RH
> years
Air = 1
Months
CH
4
S400-A
0–100 % LEL
0.1
4
15
4
-30 / +60
0–95
5
0.56
12
C
3
H
8
S480-A
0–100 % LEL
0.1
4
10
4
-30 / +60
0–95
5
1.55
12
CO
2
I-S1164-B
0–5 % vol
0.001
10
5
n.d.
-35 / +50
0–85
15
1.53
60
CO
2
I-S1164-C
0–2 % vol
0.001
10
5
n.d.
-35 / +50
0–85
15
1.53
60
CO
2
I-S1164-C
0–20,000 ppm
10
10
5
n.d.
-35 / +50
0-85
15
1.53
60
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
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
5
Manufacturer-recommended calibration intervals for normal environmental conditions.