a. Double check the wiring in the connector or in the WebMaster or
device to ensure power is applied to the sensor.
b. Check that the pump is primed or not in an air-lock condition. Re-
prime the pump and make sure it is pumping against some
backpressure.
c. Check the model number of pump and if it is able to pump over 35
PSI.
d. Double-check the pressure of the system – the requirements of the
PosiFlow are 35 PSI. Use a separate backpressure valve or the high-
pressure injection valve spring option to increase backpressure if
system pressure is too low.
e. Is the discharge line too long? Too much discharge tubing can
dampen the pressure pulses in the line and the PosiFlow will not be
able to see them. A solution is to put a backpressure valve in the
discharge line shortly downstream from the sensor.
f. Is the discharge line too large? If there is too much volume in the
discharge line, this can also dampen the pulses – especially on smaller
sized pumps – and the PosiFlow will not be able to see them. A
solution is to put a backpressure valve in the discharge line shortly
downstream from the sensor.
g. Is there trapped air/gas in the discharge line? This acts a pulsation
dampener and the PosiFlow will not be able to register the pulses if
they are damped out. Purge the air/gas out of the line and/or add a
backpressure valve just downstream from the sensor.
Note: The PosiFlow sensor does not work with any LKN or IX series
pumps. Discharge line is too large and the diaphragm moves just a
little too slow for the electronic algorithm to register.
2. LED is steady red:
a. Abnormal pressure drops or rises cause the LED to turn red.
b. Check the discharge tubing. Is it cut/broken or pumping to open
atmosphere? Use a back pressure valve or the high pressure injection
valve spring option to increase back pressure for the PosiFlow.
c. Is the discharge line clogged or closed causing a dead head condition?
Remove or relieve the closure from the discharge line for normal
operation.
3. LED is Flashing green, but no pulses being received:
a. Double check the wiring into the connector, WebMaster or device.
b. Check the programming of the pump or controller, ensuring they are
set up for incoming pulses.
Five Boynton Road Hopping Brook Park Holliston, MA 01746 USA
TEL: 508-429-1110 FAX: 508-429-7433 WEB: www.walchem.com
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