Xylem H-3553 - Manual (Page 5)

Introduction
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The WaterLOG® H-3553/ Pressure Sensor is well known for its compact size and combination of a Bubbler
and built-in pressure sensor. The H-3553 has also been referred to as a self-contained “smart” gas purge
system, because it produces a precision constant mass flow of gas.
Designed to measure fluid levels in surface water, ground water and tanks, the H-3553 Modbus or Auto
mode is enabled it will enter the RS-232 menu with any character sent to this port. uses a battery operated
compressor to maintain pressure in an internal tank. A microprocessor determines how much pressure is
needed in the tank, based on the current head pressure, to produce a constant bubble rate. The compressor
and tank replace the dry nitrogen tank used in previous systems to ensure a safer site.
A sophisticated system of sensors and valves to regulate the bubble rate and purge pressure replaces the
sight feed flow controller and pressure regulator (Conoflow system) used in previous systems. A purge feature,
temporarily pumps up the tank and opens a valve to apply high pressure to the orifice line. This feature is
designed to remove any sediment that may have collected in or around the outlet of the orifice line.
The H-3553 is a standalone system to be used with a Data Collection Platform (DCP). Additional programming
options and an H-3553 built-in menu, make the XL series DCP’s a favorite when it comes to selecting a data
logger to pair with this Bubbler.
Key Features:
• Easy to use stand-alone RS-232 menu setup
• Built in calibrated pressure sensor
• No external pressure sensor needed
• RS-485 MODBUS Client/Slave device (available in V1.3 or later)
• Auto update mode, measures itself based on user defined rate
• SDI-12 interface, 4 – 20mA output, and RS-232 data output
Display Features:
• Continuous display readout always shows last measured value
• ‘Read’ button causes the H-3553 to initiate a new measurement
• ‘Purge’ button causes the H-3553 to initiate a line purge
• ‘Tank Release’ button causes the H-3553 to release the pressure from the tank
• The adjust knob allows the user to manually set the stage and sensor SDI-12 address
Other Features:
• Provides a continuous gas flow
• Battery operated – Low power
• Microprocessor controlled, “smart” gas system
• One-piece manifold eliminates many potential sources of leaks
• Pressure gauge provides a visual indication of the tank pressure
• Hydrophobic intake membrane, protects compressor
• All components are easily accessible for inspection and maintenance
• Piston type compressor does not use diaphragm
• Provides an internal pressure relief valve
• Compressor is designed and rated for cold temperature operation
• Controlled and monitored as an SDI-12 sensor