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Installation
Wiring
Electric shock
For prevention of electric shock, the ground resistance should be 100 or less.
Reference
Refer to the instruction manual of the transmitter for detail.
Connection example
The electrode cable has the following terminals.
G: Anode terminal
R: Reference electrode terminal
T, T: Temperature compensation terminals
E: Shield wire
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.
Converter
(ex: HP-300)
G
R
T
T
E
pH electrode
Temperature
EL-6121
sensor
pH detector for pure water
measurement
(HP-8A)
4
2
T
T
No.
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.)
Fig. 1 Example of wiring with HP-300 converter
WARNING
1
4 mA to 20 mA DC
Crimp terminal
MAX6.5
MAX3.2
(1)
MAX6.2
For M3
MAX7.6
MAX4.2
(2)
MAX8.5
For M4
(1)
(2)
Ground resistance
of 100 or less
Load resistance: 600
（）
（+）
Ground resistance of
100 or less
Hold input terminal
ON resistance: 40 (max.)
Open circuit voltage: 1.2 V DC
Closed circuit current: 21 mA (max.)
wire
torque
2
1.25 mm
/MAX
0.8 N•m
（AWG16）
2
3.5 mm
/MAX
1.2 N•m
（AWG12）
24 V DC
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