Endura APA592
pH / Redox (ORP) transmitter
4 Electrical Installation
34
OI/APA592–EN Rev. E
4.8.2 Standard Application with HART Functionality
Adding resistance R
250
increases the minimum supply voltage:
U
Smin
U
Mmin
+ 0.02A x (R
Ltg
+ R
250
)
Where:
U
Mmin
–
Minimum operating voltage of transmitter
(refer to technical data for transmitter)
U
Smin
–
Minimum supply voltage of power supply/SPS input
R
Ltg
–
Line resistance between transmitter and power supply
R
250
–
Resistance for HART functionality
Fig. 4.8 Standard Application with HART Functionality
+
+
Transmitter
Power Supply /
SPS Input with Supply
U
Mmin
U
Smin
R
Ltg
R
250
Control Room