Gas And Dust Explosion Protection; Design Of Measuring System - Endress+Hauser Proline Promag 53 Safety Instructions

0
NEPSI Zone 1, Zone 21
Gas and dust explosion
protection
Design of measuring
system
8
Determine the temperature class for gas in relation to the ambient T
Determine the maximum surface temperature for dust in relation to the max. ambient temperature T
max. medium temperature T
M
Example
Device: compact version, Promag 53 , DN 25, PTFE
Max. ambient temperature: T
a
Max. medium temperature: T
M
Promag 5*P**-************
1) 2)
PFA; PTFE
Fig. 3: Procedure for calculating the max. surface temperature
1. In the associated temperature table (compact version), the selection of the measuring device
(Promag 53P), the nominal diameter (DN 25), the lining material (PTFE) and the ambient temperature
T (45 °C) determine the line in which the max. medium temperature can be found.
a
2. The fluid temperature T
M
the column, i.e. the temperature class, for gas (110 °C  130 °C T4).
3. The maximum temperature of the calculated temperature class corresponds to the maximum surface
temperature (T4 = 135 °C = maximum surface temperature for dust).
m
A
m
a
Fig. 4: Design of the measuring system, compact/remote version
A Transmitter housing (compact version)
B Transmitter housing on connection housing, remote version
C Sensor connection housing, remote version, Promag W/P
Sensor connection housing, remote version, Promag H, DN 
D
Sensor connection housing, remote version, Promag H, DN  40
E
a Screw terminal for connecting to the potential equalization
b Connection compartment cover
c Connecting cable, coil current cable
d Connecting cable, signal cable
m to n see following chapter "Cable entries"
!
Note!
Connection of remote version connecting cable Page 10
= 45°C
= 110 °C
T6
T
DN
a
(85 °C)
1)
80
25...200
+40 °C
2)
15...600 80
1)
80
25...200
+45 °C
2)
80
15...600
1)
25...200 80
+50 °C
2)
15...600 80
DN 25 PTFE
(110 °C), which is smaller or equal to the max. fluid temperature, determines
m
B
b
n
c d c
n
n
a
a
C D
Proline Promag 53
and medium temperature T
a
T5 T4 T3 T2
(100 °C) (135 °C) (200 °C) (300 °C) (450 °C)
95 130 150 150
95 130 130 130
95 130 130 130
95 130 130 130
95 95 95 95
95 95 95 95
T = 45 °C T = 110 °C
a M
( £ 130 °C)
b
d c d
n
b
a
E
Endress+Hauser
M
and
a
T1
150
130
130
130
95
95
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