LPGmass
18
Hauser
Temperature tables
In the following tables, the following interdependencies between the maximum medium
temperature T
m
for T6 to T1 and the maximum ambient temperature T
a
apply when operating the
device in hazardous areas.
Ex ia,
C
CSA
US
IS
SI units
Order code for "Housing"
T
a
[°C]
T6
[85 °C]
T5
[100 °C]
T4
[135 °C]
T3
[200 °C]
T2
[300 °C]
T1
[450 °C]
Option A "Compact coated alu"
35
50
85
120
150
150
150
50
–
85
120
150
150
150
60
–
–
120
150
150
150
US units
Order code for "Housing"
T
a
[°F]
T6
[185 °F]
T5
[212 °F]
T4
[275 °F]
T3
[392 °F]
T2
[572 °F]
T1
[842 °F]
Option A "Compact coated alu"
95
122
185
248
302
302
302
122
–
185
248
302
302
302
140
–
–
248
302
302
302
Explosion hazards arising from gas and dust
Determining the temperature class and surface temperature with the temperature table
• In the case of gas: Determine the temperature class as a function of the ambient temperature T
a
and the medium temperature T
m
.
• In the case of dust: Determine the maximum surface temperature as a function of the maximum
ambient temperature T
a
and the maximum medium temperature T
m
.
Example
• Measured maximum ambient temperature: T
ma
= 47 °C
• Measured maximum medium temperature: T
mm
= 108 °C
Ta
[°C]
T1
[450°C]
35
140
50
140
60
140
35
140
45
140
50
140
50
85
120
140
140
–
85
120
140
140
–
–
120
140
140
50
85
120
140
140
–
85
120
140
140
–
–
120
140
140
T6
[85°C]
T5
[100°C]
T4
[135°C]
T3
[200°C]
T2
[300°C]
A0031223
7
Procedure for determining the maximum surface temperature
1. Select device (optional).
2. In the column for the maximum ambient temperature T
a
select the temperature that is
immediately greater than or equal to the measured maximum ambient temperature T
ma
that is
present.
T
a
= 50 °C.
The row showing the maximum medium temperature is determined.
3. Select the maximum medium temperature T
m
of this row, which is larger or equal to the
measured maximum medium temperature T
mm
.
The column with the temperature class for gas is determined: 108 °C ≤ 120°C → T4.
