Troubleshooting & Application requirements
a. A minimum system pressure of 35 PSI is required for operation. This is usually not
a problem as most installations are above 35 PSI. However if the application is less
than 35 PSI or open discharge, there are a couple of solutions:
1. Standard diaphragm style BP/AS (Back Pressure/Anti-Siphon) Valves.
These come in a variety of styles and are available by several manufacturers.
They are typically adjustable from 10-150 PSI. The BP/AS valves from
Walchem are pre-set at 50 PSI and will work out-of-the box with the
PosiFlow with any pump.
2. An alternate solution specifically for the 11, 16 and 21 sized E-Series pumps
is the E90375 spring option. This is a higher-pressure spring made to go in
the 3/8” OD tubing Injection Valves to simulate an approximate backpressure
to the pump and PosiFlow of 50 PSI. Instructions for installation are
supplied with the spring. Note: Depending on the application, the spring may
wear over time and its back pressure-producing ability may diminish, causing
the PosiFlow to stop registering pulses. Replace the spring as necessary.
b. Pressure limitations of some pumps will render use with a PosiFlow difficult. These
include all pumps with a maximum pressure rating of 30 PSI:
1. EZ/EW/EKB31 size Pumps
2. EZ/EW/EKC36 size Pumps
3. EHE56 size Pumps
Each of these pumps can pump up to 30 PSI, but not much (if any) more. Because
the PosiFlow requires 35 PSI to operate reliably, operation with these pumps is not
recommended. Use with the EHE56 has been successful, but because the PosiFlow
will not fit into the B/C-31/36 size Manual Air Vent Valves, use with these sizes is
not recommended at all.
c. The PosiFlow is basically a pressure transducer with algorithms built in to determine
if the pressure changes should be considered a pulse from moving chemical.
Because of this, some pumps application/pump combinations may not work as well
as others. In particular, small B11 pumps used with a PosiFlow may not work if the
pump is turned down too low. Since the PosiFlow needs to see a pressure spike, if
the Stroke Length is too small, the spike generated may not be large enough to
register. Similarly, if the speed is turned down too low, it is very easy for the tiniest
bubble or tubing to dampen out the small pulses. A combination of both Stroke
Length reduction and slower speeds is almost a guarantee that the PosiFlow sensors
will have trouble reading the B11 pump pulses. Higher back pressure installations
often will help this, but if the output is much below 0.2GPH, testing may be
required.
d. My pump is pumping, but it isn’t registering pulses from the PosiFlow.
1. LED is OFF.
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