Technical Data
MSA
ULTIMA X ® Series
GB
63
ULTIMA XIR - Relative Response to 50 % LEL
The ULTIMA XIR response to 50 % LEL of the measuring gas, when configured to
linearisation curve number 2 [Propane] and calibrated in clean air and 50 % LEL
Propane, is shown below for various flammable gases and vapours.
When using relative response factors for gas calibration, deviations of up to ±20 %
of the true measuring gas concentration can be expected.
Measuring gas
100 % LEL in
Vol%
Linearisation
curve
Reference Gas
Concentration
[Propane]
Relative
response
factor
Toluene
1.1 Vol%
(8) Ethylene
0.25 Vol%
3.75
Xylene
0.96 Vol%
(2) Propane
0.41 Vol%
2.56
Response time with measuring gas when using the ULTIMA XIR Flow Cap
[flow rate 1 l/min.]: 50 = 10 s, t
90
= 30 s.
Measuring gas
100 % LEL in
Vol%
Response to 50 % LEL of the
measuring gas
Acetone
2.5 Vol%
15 % LEL
Acetylene
2.3 Vol%
0 % LEL
Allyl alcohol [50 °C]
2.5 Vol%
16 % LEL
Ammonia
15 Vol%
0 % LEL
[FAM-] Benzine 65/95
1.1 Vol%
46 % LEL
1,3-Butadiene
1.4 Vol%
7 % LEL
i-Butane
1.5 Vol%
49 % LEL
n-Butane
1.4 Vol%
47 % LEL
2-Butanon [MEK]
1.8 Vol%
25 % LEL
i-Butyl Acetate
1.3 Vol%
34 % LEL
n-Butyl Acetate
1.3 Vol%
36 % LEL
i-Butylene
1.6 Vol%
25 % LEL
Cyclohexane
1.2 Vol%
31 % LEL
Cyclopentane
1.4 Vol%
53 % LEL
Diethyl Ether
1.7 Vol%
42 % LEL
Acetic Acid [50 °C]
4.0 Vol%
78 % LEL
Acetic Anhydride [50°C]
2.0 Vol%
2 % LEL
Ethane
2.5 Vol%
56 % LEL
