Baseline Systems BHM Series Hydrometer - Manual (Page 17)

Hydrometers Operation and Maintenance Manual •
17
Operations
The hydrometer is designed to operate in a variety of automatic and remote control applications.
The hydrometer valve is also capable of manual operation and the register dial may be read as an
ordinary water meter.
A. Manual Operation
The hydrometer may be manually operated using the 3-Way Selector:
• To manually open the valve: Rotate the 3-Way Selector to the “Open” position.
• To manually close the valve: Rotate the 3-Way Selector to the “Close” position.
B. Automatic Operation
Automatic operation is made possible by direct hydraulic control from a remote controller or
control center. Volume and/or flow data is electronically transmitted to the remote controller
by means of a reed switch transducer. The command to open or close the hydrometer valve is
transmitted from the controller to a solenoid, which, in turn, transmits a hydraulic command to the
hydrometer.
Automatic operation may also be based on a pre-set pressure or flow rate by the use of one or
more Pilot Valves. To enable automatic and/or remote operation, rotate the 3-Way Selector to the
“Auto” position.
C. Solenoid Operation
The hydrometer is always controlled via an external solenoid valve. A “normally open” (NO),
high pressure, 3-Way solenoid valve is required for this purpose resulting in a normally closed
hydrometer. When a normally closed solenoid is used it will result in a normally open hydrometer.
An electric cable connects the controller and the solenoid valve. 8 mm polyethylene tubing runs
from the solenoid valve to the “Auto” connection on the 3-Way Selector.
3-Way Selector
SOLENOID
SOLENOID
SOLENOID
SOLENOID
Automatic Position
Operated by the Controller
Open
Manual Override
Automatic
Position
Open
Position
Electric Solenoid Specifications
• Operation:
– Solenoid: 24vac 5.5 watts,
0.23 amps inrush
– Manual Override
• Construction: Brass
• Connections: In/Out NPT Threaded