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Installation
23
Control output for automatic zero calibration (AC power-supply voltage
output)
This is a voltage control output that controls the electric ball valve for the sample water line
and solenoid valve for zero water. For the sample water line, in order to control the electric ball
valve applicable to a large bore size, power is supplied to either the open or close operation.
Make connections so that the electric ball valve is normally open. When the open/close
operation of the electric ball valve is completed, the power is cut off by the internal limit
switches.
Connect the solenoid valve for zero water so that it is normally closed (power is OFF) and is
opened when it is energized. The solenoid valve is opened in the automatic zero calibration
and manual zero calibration modes.
Note
The voltage for AC power output is the same as that to be supplied to the converter. Check that the
power supply specification for the solenoid valve and electric ball valve is the same as the voltage to
be supplied to the converter.
Equipment status
Solenoid valve
Electric ball valve
During measurement
Closed
Power OFF Opened AC power output between Sb (L) - Sc (N)
During zero calibration Opened Power ON
Closed
AC power output between Sa (L) - Sc (N)
Sb (L)
Sa (L)
Electric ball valve control
Solenoid
valve control
Opening
operation
Closing LS
b contact
Opening LS
Sb (L)
Closing
operation
Sa (L)
L
N
a contact
AC power supply
M
Sc (N)
Electric ball valve