Endress+Hauser TH53, Technical Information

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TH53, TH54 and TH55
6 Hauser
Terminal block mounted
1 2
- -
+ +
Sensor 2 Sensor 1
A0026045-EN
The blocks and transmitters are shown as they sit inside the heads in reference to the conduit
opening.
Integrated overvoltage protection
The integrated overvoltage protection module can be ordered as an optional extra
1)
. The module
protects the electronics from damage from overvoltage. Overvoltage occurring in signal cables (e.g.
4 to 20 mA, communication lines (fieldbus systems) and power supply is diverted to ground. The
functionality of the transmitter is not affected as no problematic voltage drop occurs.
Connection data:
Maximum continuous voltage (rated voltage) U
C
= 42 V
DC
Nominal current I = 0.5 A at T
amb.
= 80 °C (176 °F)
Surge current resistance
• Lightning surge current D1 (10/350 µs)
• Nominal discharge current C1/C2 (8/20 µs)
• I
imp
= 1 kA (per wire)
• I
n
= 5 kA (per wire)
I
n
= 10 kA (total)
Temperature range –40 to +80 °C (–40 to +176 °F)
Series resistance per wire 1.8 Ω, tolerance ±5 %
4
+
-
1
2
3
5
6
+ -
3 4
S1
3
S2
-
+
+
-
!
+
Sensor 2
Sensor 1
-
Bus connection and
supply voltage
A0033027-EN
 2 Electrical connection of the overvoltage protection
Grounding
The device must be connected to the potential equalization. The connection between the housing and the local
ground must have a minimum cross-section of 4 mm
2 (13 AWG) . All ground connections must be secured
tightly.
1) Available for the field transmitter with HART® 7 specification