Flow Gauge
®
User’s Manual
Welcome to H2OPro – Flow Gauge
Flow Readout
Total Volume Readout
A/B Button
Short Press: Switch
between A and B totalizers
Long Press: Zero selected
totalizer
A/B Totalizer Selection
Gal/L Button
Short Press: Switch units
between gallons and liters
Wire Connections
E-PWR: External power
S-PWR: Flow meter power
S-OUT: Flow meter pulse output
GND: External power and flow meter common
Display Light
Press A/B and Gal/L buttons
simultaneously
Battery Life
The H2OPro-Flow Gauge is a compact digital readout for H2OPro flow meters. Flow rate and volume
can be displayed in either gallons or liters with two independent volume totalizers. The unit can be powered
internally by two AA batteries or by an external +4 to +24VDC power supply.
Functions
Support
Customer support is available at www.H2OProTech.com on the FAQ page and by e-mail to support@Hot-
Socket.com. In addition, the website provides access to all manuals and quick start guides for H2OPro
products.
2 H2OPro Flow Gauge User Manual- © Hot Socket, LLC www.H2OProTech.com
Flow Meter Connection
H2OPro
Flow Gauge
Description
H2OPro 3-Wire Flow Meter
Or Alternate Vendor Meter
H2OPro 2-Wire Flow Meter
E-PWR
External Power
Positive Supply
Not Required
Not Required
S-PWR
Power for Flow Meter
Red - Power Input
Red - Power Input and Pulse
S-OUT
Flow Meter Sensor
Pulse Output
Yellow – Digital Pulse
Output
Not Required
GND
Common
Black – Common
Black – Common
H2OPro 3-Wire and 2-Wire Flow Meters
The H2OPro 3-wire flow meters connect to the H2OPro Flow Gauge as shown. The H2OPro Flow Meter
data sheets can be accessed at www.H2OProTech.com.
3 H2OPro Flow Gauge User Manual- © Hot Socket, LLC www.H2OProTech.com
Battery and External Power Connection
Battery Replacement
Remove the four corner screws from the case and pull the top off. The battery compartment is attached
to the back of the PCB.
External Power
The H2OPro Flow Gauge can use an external power supply connected to the E-PWR and GND wire
connections. The power supply should be between +4VDC and +24VDC. The external power can be used
with or without the batteries installed. When the external power supply is used the batteries will not
supply power, however they will power the system if the external power supply is disconnected or fails.
A special PC USB cable with flying leads can be used to apply external power.
4 H2OPro Flow Gauge User Manual- © Hot Socket, LLC www.H2OProTech.com
H2OPro
Flow Gauge
Power Supply
E-PWR
+4 to +24 VDC
GND
Common
Rev. 1
August 29, 2018
Initial release
Change History
5 H2OPro Flow Gauge User Manual- © Hot Socket, LLC www.H2OProTech.com
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