Pump Solutions Group Neptune Series PZ_PZi_PZiG Pulse Metering Pumps - Manual (Page 6)

6
ANALOG SIGNAL INPUT PZi4 / PZi8 / PZiG PULSE SIGNAL INPUT
1. Frequency-division (1/1 to 1/9999 adjustable)
Example: 1/6 frequency-division
Signal
Pump operation
2. Multiplication (1 to 9999 adjustable)
Example: 5 times multiplication
(A) Pulses 5 times—next 5 strokes at normal operating speed.
Signal
(B) Pulses 5 times evenly spaced over one minute.
PZi
Conventional products
PZi4 / PZi8 / PZiG
(A)
(B) Injection is more uniform.
1. Proportional band function
The proportional band can be adjusted within a range of ±1% to ±999%.
Pump response to increasing input signal is easily reversed from min. 4mA
and max. flow at 20mA to max. flow 20mA and min. flow at 4mA.
0mA to 20mA range on PZi8 models.
4 (0) Signal 20mA
0
100%
P
u
m
p
o
p
e
ra
ti
o
n
(A)
(B)
2. Shift function
Shift can be set within the range ±100%
allowing a min. preset flow at 0 (4mA)
signal or allowing no flow until the input
signal exceeds a preset value.
DC4 (0) to 20mA input
4 (0) 12 20
0
300
150
P
u
m
p
st
ro
k
e
(s
p
m
)
Analog input (mA)
200%
100%
999%
50%
1%
30
4.16 4 (0) 12 20
0
300
150
P
u
m
p
st
ro
k
e
(s
p
m
)
Analog input (mA)
–200%
–999%
–50%
–1%
270
4.16
–100%
• Digital settings from 15 to
300 pulses per minute on
PZ models and from 1 to 300
pulses per minute on PZi and
PZD models
• High stroking speed
ensures more uniform
distribution of chemical at
low feed rates
• Pump delivery is constant
at any voltage from 94 to
264 VAC single phase and
is not affected by voltage
fluctuations
• Outdoor use—pump is water
and UV resistant. Equivalent
to IEC specification IP65.
Dust proof, wash down
duty (with proper electrical
connection).
Advantages
Applications
• Injection of chemicals to boilers and cooling towers
• Chlorine sterilization for food plants, small-scale water-supply
systems, buildings and swimming pools
• Injection of nutrients and disinfectants in the livestock industry,
such as poultry and hog producers, as well as for hydroponic
cultivation
• Very low flow rate injection of low viscosity liquids for any
application (100 CPS max. except high viscosity models)
Cross Sectional view applies to PVC, Kynar and Type CL Heads;
does not apply to Material Codes ARPZ, SS or any PZiG Liquid Heads.
Some models use single check balls.