Class1 Digital Display - Manual (Page 8)

8
Installation
The Class1 Digital Flowmeter measures water velocity in the pipe to calculate
the flow rate. The location of the paddlewheel transmitter is important for proper
operation and accurate readings. Mount the transmitter in a location that is acces-
sible for future maintenance and in an area where laminar (non-turbulent) flow is
most likely to be maintained. Most problems with flowmeter accuracy and perfor-
mance can be traced to the location of the transmitter.
The hole size for the paddlewheel transmitter (PN102714) mount is 1-1/2”.
The hole size for the paddlewheel transmitter (PN101199) mount is 1-7/8”.
Transmitter Location
Elbows/Bends A straight run of pipe to the transmitter of at least six (6) times
the pipe diameter after an elbow or other turbulence producing item is desirable
for a successful installation. Try to locate the transmitter using the longest straight
section of pipe available. Minimal turbulence at the transmitter provides the most
accurate reading.
Valves/Gates If the transmitter is downstream of a valve, the minimum dis-
tance is fifteen (15) times the pipe diameter. Whenever possible, mount the
transmitter before a valve.
Horizontal Pipes The transmitter will work in any position, however when mounted
on a horizontal run, it should be mounted in the top half of the pipe to allow debris
to be flushed out of the paddlewheel.
Increase/Decrease in pipe size The transmitter can be placed after an increase
in pipe diameter, never after a decrease.
Class1 flexible hose can greatly assist in reducing the number of elbows and amount of
turbulence between the pump and discharge pipe.
Wiring
The Flowmeter system comes with a wiring harness that connects the transmit-
ter to the display.
The OEM must supply power and ground to the digital display. Consideration
should be given to the conditions under which the display will have power.
The display is internally protected against short circuits, overvoltage and reverse
polarity, but standard installation procedures should provide for circuit protection.
Maximum current used by the flowmeter is 1.5 Amps.
A momentary grounding switch can be added when the totalizer function is de-
sired. This is connected to the display through the 8 pin mini-connector at pin 8.
Flowmeter Flowmeter Flowmeter Flowmeter Flowmeter