Endress+Hauser Proline Promass 200, Safety Instructions

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Proline Promass 200
10
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 of the maximum surface temperature for explosion hazards arising from dust
Device: Promass F 200, compact version, DN 25 mm
Maximum ambient temperature: T
a
= 60 °C
Maximum medium temperature: T
m
= 98 °C
Basic specification, Position 3 (Output) = C
Abb. 1: Procedure for determining the maximum surface temperature
Procedure for determining the maximum surface temperature:
1. Select the device (Promass F 200), nominal diameter (DN 25) and ambient temperature
T
a
(60 °C) in the associated temperature table (compact version). The row showing the
maximum medium temperature is determined.
2. Select the maximum medium temperature T
m
(98 °C), which is smaller than or equal to
the maximum medium temperature of a cell. The column with the temperature class for
gas is determined (130 °C → T4).
The maximum temperature of the temperature class determined corresponds to the
maximum surface temperature: T4 = 135 °C = maximum surface temperature for dust.
Promass F 200 T = 60
a
°C
T = 130
m
°C
( 98 °C) £
Ta
[°C]
T6
[85 °C]
T5
[100 °C]
T4
[135 °C]
T3
[200 °C]
T2
[300 °C]
T1
[450 °C]
35 50 95 130 140 140 140
50 -- 95 130 140 140 140
60 -- -- 130 140 140 140
35 50 95 130 150 150 150
50 -- 95 130 150 150 150
60 -- -- 130 150 150 150
Promas E 200
Promass F 200
Sensor type