Pump Solutions Group Neptune Series PZ_PZi_PZiG Pulse Metering Pumps - Manual (Page 8)

PZiG
PZiG for
alkali use
PZiG
Discharge volume (%)
Main piping
flow rate (%)
100
100
0
Alkali injection amount
pH
100 (%)
7 6.5
0
Acid injection amount
pH
100 (%)
14 7.5 7
0
Chemical injection amount
Residual chlorine
concentration
100 (%)
1mg/L 0.5
0
Motor-driven
pump
Motor-driven
pump
Motor-driven pump
INV PID
DSC
DIS
Inverter
<50:1 control>
Alkali tank
PZiG for
acid use
Acid tank
PH
AG
PID PID
INV INV
AG
RM
RM
Example: On-site pH control
Example: Disinfection using electrolytic sodium hypochlorite in swimming pools
PH
PZiG setting
for alkali use
PZiG setting
for acid use
*The pH 6.5 to 7.5 range is set as the dead band.
P
P
INV PID
Control panel
PID controller
Residual chlorine meter
Inverter
Control panel
Electrolytic sodium
hypochlorite
generating unit
Agitator
PID controller
Servo motor
Servo controller
PID controller
Inverter
pH meter
Display
Flow meter
Example: Any additive injected proportional to flow in a line
Current
system
Current
system
Current
system
PZiG
system
PZiG
system
PZiG
system
Motor-driven
pump
Static mixer
<300:1 control>
8
Programmable Models PZi8 & PZiG Control System Examples
YOUR SYSTEM IS ENHANCED BY OUTSTANDING CONTROLLABILITY
Sterilization – Model PZiG only
Automatic control is possible on the pump unit merely by receiving signals directly from the residual chlorine meter and setting the target residual chlorine value.
Cost benefits: Control panels (PID controllers and inverters) are no longer required.
Advantage
pH Control – Model PZiG only
Control signals from the pH meter are received and chemicals are automatically injected
according to the preset pH value. This simplifies the configuration of the control devices.
Cost benefits: Two PID controllers and two inverters are no longer required.
Advantage
Proportional Flow Rate Control – Models PZi8 & PZiG
Flow meter signals are received directly according to the flow rate of the main piping and the discharge volume is automatically controlled.
This eliminates the need for control devices, which have been needed up until now, and reduces the cost of devices.
Cost benefits: Digital panel meters, PID controllers and inverters are no longer required.
Advantage
8