Endura APA592
pH / Redox (ORP) transmitter
4 Electrical Installation
OI/APA592–EN Rev. E
35
4.8.3 Electrical Connection in Hazardous Area
Special interconnections are required for use in hazardous areas depending on the safety requirements.
Intrinsic safety
The power supply SPS inputs must have corresponding input protection circuits available to eliminate spark
hazards. An interconnection inspection must be performed. For proof of intrinsic safety, the electrical limit
values must be used as the basis for the prototype test certificates of the transmitters, including the
capacitance and inductance values of the wires. Proof of intrinsic safety is granted if the conditions in Table
4.4 are fulfilled.
Caution.
Refer to Section 2, page 11 and Section 10, page 90 for hazardous area risk requirements.
APA592–PH
(Intrinsically Safe Transmitter)
Power Supply/SPS Input
(Related Apparatus)
U
i
U
o
I
i
I
o
P
i
P
o
L
i
+ L
c
(cable)
L
o
C
i
+ C
c
(cable)
C
o
Table 4.4 Intrinsic Safety Conditions
Fig. 4.9 Hazardous Area Risk Application
+
+
Transmitter
Power Supply
SPS Input
Field (Ex Area)
Control Room
(Secure Area)
