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Installation
4
Wiring
Reference
Refer to the instruction manual of the transmitter for detail.
Connection example
The electrode cable has the following terminals.
As shown in the following diagram, connect the electrode cable to the terminal block being
careful not to make any mistakes in matching between terminals.
Fig. 1 Example of wiring with HP-300 converter
WARNING
For prevention of electric shock, the ground resistance should be 100
G: Anode terminal
R: Reference electrode terminal
T, T: Temperature compensation terminals
E: Shield wire
G
R
T
Temperature
sensor
pH electrode
EL-6121
Ground resistance
of 100
or less
Load resistance: 600
24 V DC
(
)
pH detector for pure water
measurement
(HP-8A)
4 mA to 20 mA DC
Converter
(ex: HP-300)
(1)
Hold input terminal
ON resistance: 40
(max.)
Open circuit voltage: 1.2 V DC
Closed circuit current: 21 mA (max.)
E
(
+
)
No.
Crimp terminal
wire
torque
(1)
1.25 mm
2
/MAX
(
AWG16
)
0.8 N•m
(2)
3.5 mm
2
/MAX
(
AWG12
)
1.2 N•m
MAX3.2
For M3
MAX6.2
MAX6.5
MAX4.2
For M4
MAX8.5
MAX7.6
1: Connect the short circuit board which is attached to a pH electrode between R and SE.
2: Connection-free (Cap is attached to the terminal.)
2
1
T
(2)
Ground resistance of
100
or less
T
T