The
PosiFlow sensor will verify that your metering pump is
truly moving liquid and has not lost prime. Designed
for the ES, EH & EW series pumps, the PosiFlow
detects the flow of liquid output by the pump without
any moving parts. The standard flow path of the pump
is kept so liquid does not have to go through any
gears or move a magnet to actuate a pulse in the
sensor. This eliminates any concern of plugging or
jamming of the sensing mechanism. The PosiFlow sensor
utilises proprietary circuitry coupled with advanced
pressure sensing technology to provide the most
accurate and non-intrusive flow verification device to
date. The output signal of the PosiFlow Sensor is an
open-collector contact closure corresponding with each
flow pulse. Additionally, a visual green LED is
mounted on the top side of the sensor. This is always
ON to indicate power and will briefly flash OFF in
sync with each output signal. To function accurately,
the sensor requires 30 psi of back pressure. If an
application has little or no system pressure, an
upgrade spring for the standard injection check valve,
or a separate back pressure valve, is available to
ensure the sensor functions properly. The PosiFlow
will send out a signal with every stroke as long as
there is liquid flow. If the pump becomes air-locked
or if the pump is in a dead-head condition, the sensor
will no longer output a signal. Also, if large volumes
of air are in the line during normal pumping
operation, the PosiFlow will temporarily stop
signalling flow until normal operation returns.
• 12 VDC power source via WebMaster, or
pump with “Y” module or external power
source
• mounts directly into Iwaki vent valve
• requires minimum of 30 psi total back pressure
• LED indicator
• output signal 100 mS
