Dwyer PWD User Manual
SERIES PWD
PULSE DIVIDER
INSTRUCTIONS
F-PWD
GENERAL INFORMATION & SPECIFICATIONS
Designed for use as a meter accessory, the PWD divider is used
primarily for pacing electronic metering pumps. Any number
from one to 9999 can be set on rotary switches. Each time the
divider has received the set number of pulses from the meter,
it puts out one pulse to stroke the pump. The PWD is also
useful in boiler and cooling tower feed and bleed operations,
and for lowering frequency output of high frequency meters.
Compatible with all Dwyer Instruments Inc. pulse output ow
meters, the PWD creates a programmable pulse meter with
an easily adjustable pulse rate.
The PWD comes in two different housings: an enclosure that
can be mounted near the pump, and a watertight housing for
mounting on the meter.
INSTALLATION & CONNECTIONS
MOUNTING
The PWD-M is factory-mounted on the ow sensor. The PWD-
W is mounted by attaching it to the metering pump with the
included double-backed, pressure-sensitive tape. Alternatively,
the control can be wall mounted with screws using the mounting brackets that extend out either side.
PWD-W/LMI PUMP
The 24" pigtail that extends from the PWD-W connects to an
LMI metering pump and is connected as shown.
The input connector on the control mates with any three-pin
Dwyer® connector. (Dwyer® Meters or ow sensors to be used
with a PWD-W should be ordered with Dwyer® connectors.)
PD10W/LMI Pump
FEATURES
SPECIFICATIONS*
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Protective cover
Rotary Switches (4)
Mounting Holes:
(Double-backed pressure-sensitive
tape also supplied standard)
Potted for environmental
protection
Wall (Pump) housing shown
(Meter mount also available)
To leads or metering
pump connector
Enclosure Wall (Pump) Mount
Meter Mount
Temperature
Divider Range
Setting Mechanism
Power
Maximum Sensor Load
Maximum Input Frequency
Maximum Output Frequency
Output
Output Pulse Width
Input Connection Wall Mount
Meter Mount
Output Connection Wall Mount
Meter Mount
*Specications subject to change
Epoxy-encapsulated ABS housing with cover
Cast aluminum sealed housing
0 to 130˚F (-18 to 55˚C)
1 to 9999
Rotary switches
7 to 30 Vdc @ 4 mA
20 mA
350 Hz (pulses/second)
8 Hz (pulses/second)
Solid state relay; 0 to 250 V, 170 mA max AC/DC
0.1 second
Dwyer connector
Terminal
Pump connector on 24" lead
Comes with 18' lead
Input connector for meter
PWD-M meter mounted version
POWER SOURCE
Power for the PWD can be supplied by the metering pump if
the pump has a sensor power supply. Some pumps require
an external power supply, available from Dwyer Instruments
Inc. LMI pump and Dwyer® connectors are available.
CAUTION:
Power supplies 18 Vdc and higher must be regulated to
prevent damage to the PWD caused by voltages exceeding
its 30 V allowable maximum supply voltage due to AC line
variations and light loading.
CONNECTIONS
The PWD-M can be connected as shown.
PWD-M
PWD-M
Dwyer® is a registered trademark of Dwyer Instruments Inc.
LMI Pump
LMI Connector
(supplied with
PWD-W)
1
4
2
3
Sockets
Meter
2
1
5
3
4
Sockets
Sockets
PWD
Dwyer®
Sensor
Connector
(order with
ow meter)
3
1
2
-PC4 Option -PC5 Option
1. Auxiliary Power Source
2. Pulse Input
3. Ground
4. No Connection
1. Remote On
2. Ground
3. Pulse Input
4. Aux. Power Source
5. Not Used
1. Ground
2. Input Signal
3. Sensor Power
+7-30 Vdc*
*CAUTION: If power is supplied to the ow sensor from the
PWD, ensure that the voltage supplied to the sensor does not
exceed the sensor's allowable maximum input voltage.
PWD-W/NONLMI PUMP
If a metering pump is used that requires a connection other
than the LMI connector supplied, cut the LMI connector off.
Connect the PWD-W to the pump using the diagram below in
conjunction with the wiring diagram in the pump manual.
PWD-W/Non-LMI Pump
Red
Black
Green
White
7-30 Vdc
Ground
Signal +
Common
PWD
POWER
OUTPUT
+
–
+
–
The input connector on the control mates with any three-pin
Dwyer® connector. (Dwyer® Meters or ow sensors to be used
with a PWD-W should be ordered with Dwyer® connector.)
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