INSTALLATION
Piping Requirements
Standard fittings are female NPT. If the piping connected
to the meter is metallic, care should be taken not to
overtighten. Straight pipe of at least five diameters
upstream of the meter is recommended. Vertical or
horizontal installations are acceptable.
K-Factor
The meter is factory calibrated. The K-factor is found on
the label on the meter body and must be input into the
control/display for accurate reading.
WARNING:
This meter has low-friction bearings. Do
not at any time test operation of the meter
with compressed air. Doing so will subject
it to rotational speeds many times those
for which it was designed, and will certainly
damage the rotor, shaft, and/or bearings.
K-factor on label
INSTALLATION & CONNECTIONS
CONNECTIONS
Connecting to Control Devices
It is often desirable to connect an FPR300/310 flow sensor
to a PLC or industrial computer board, and the sensors are
well suited for this. Typically it can be connected directly,
or with a single resistor added. The pickup sensors are
current sinking (NPN) GMR devices that require 6–36 Volts
DC and 2 mA current. They can connect directly to a PLC
or computer board if:
1.
The sensor power supply on the PLC is 6–36 Vdc (24
Vdc is typical).
2.
The sensor power supply can provide at least 2 mA
(100 mA is typical).
3. The sensor input on the PLC can accept a current
sinking device.
4.
The PLC frequency response > flow meter output
frequency.
Input designed for current sinking devices (NPN)
If the PLC input only accepts current sourcing devices, a
pull-up resistor must be added. Typically, on a 24 Vdc input
a 2.2 K Ohm resistor will be effective.
Input designed for current sourcing (PNP) devices
Since the three-wire pickup sensors are solid state, they
do not exhibit switch bounce and can be used at relatively
high frequencies.
If the PLC is equipped with a 4-20 mA analog input module,
it is necessary to order the FPR300/310 Series flow sensor
with some form of 4-20 mA transmitter. Two options are
the FMG-1000-MAW blind transmitter and the DPF144
indicating transmitter. Follow the connection diagrams for
these products to connect to the analog input.
Red
White
Black
Red
White
Black
Signal
+DC Voltage
Ground
Signal
+DC Voltage
Ground
Figure 1
Figure 2
Input Designed for Current
Sinking (NPN) Devices
Input Designed for Current
Sourcing (PNP) Devices
2.2K Ohm Pull-up
Resistor
NPN
Device
NPN
Device
NPN Device
NPN Device
Red
White
Black
Red
White
Black
Signal
+DC Voltage
Ground
Signal
+DC Voltage
Ground
Figure 1
Figure 2
Input Designed for Current
Sinking (NPN) Devices
Input Designed for Current
Sourcing (PNP) Devices
2.2K Ohm Pull-up
Resistor
NPN
Device
NPN
Device
NPN Device
PNP Device
FPR300/310 SERIES INSTRUCTIONS
Page 6
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