Endress+Hauser prowirl 70 - HART and INTENSOR Communication; HART Connection for EEx ib; HART Connection for EEx d

Connection HART
EEx ib version (Prowirl 70 ****-*******B***)
Only the HART handheld unit DXR 275-***I1* (Ex version) is allowed to be connected
in explosion hazardous area.
EEx d version (Prowirl 70 ****-*******C***)
Operation of HART terminal DXR 275 is permitted only in the safe area.
Exception:
Verify with the use of a gas sensor that no explosive atmosphere is present. Connect
the HART handheld to the terminals 1 and 2. The power supply circuit must have an
internal resistance of min. 250 Ω. Use the plugin resistor with the handheld unit if
necessary.
+
-
I
O
4...20 mA
0000
Test
1
2
3
+
4...20 mA
min. 250 Ω
I
O
I
O
Ex i
I
O
Hazardous area
Safe area
DXR 275
xa019y09
DXR 275-***I1* (Ex version)
Cenelec conform
Zener barrier
Fig. 9
Connection of the HART terminal
DXR 275-***I1* to the EEx ib in-
trinsically safe version
Note!
Minimum 250 Ω loop resistance needed for
HART communication, use the plugin
resistor if necessary.
Hazardous area
Safe area
Power supply:
12...36 V
18,5...36 V (HART/Intensor)
I
max
= 20 mA
DXR 275
xa019y10
Fig. 10
Connection of the HART termi-
nal DXR 275 to the EEx d
explosion proof version
en
Prowirl 70
Endress+Hauser 9