Xylem H-3342 - Manual (Page 5)

Chapter 1
Introduction
H-3342
Introduction 1-1
1.0 Introduction
The W
ATER LOG H-3342 is a digital shaft encoder which measures water depth by monitoring ®
the position of a float and pulley system. The H-3342 is easy to use and works with any SDI-12
data recorder. The “Serial-Digital Interface” is ideal for data logging applications with the
following requirements:
! Battery powered operation with minimal current drain
! Multiple sensors on a simple three-wire cable
! Up to 250 feet of cable between a sensor and the data recorder
(Use of H-423, SDI-12 to RS485 converter extends the range to 1000's of feet,
a H-4500 fiberoptic media converter works up to 1.2 miles)
The H-3342 has the following features:
! Non-contact optical encoder
! Absolute, shaft position is not lost if the power fails or is disconnected
! High resolution (65,536 counts/rev)
! ±32,768 max turns
! Zero backlash
! Scales the encoder position into user units of feet, meters, etc.
! Precision ball bearing design with special low temperature lubricant
! Threaded shaft compatible with existing pulleys
! Sealed enclosure protects from moisture and dirt
! Low current operation (less than 150 microamps typical standby)
! Water resistant connector provides easy hookup
! Continuous display readout always shows last measured value.
! ‘Read’ button causes the H-3342 to continuously update the display while the button is
pressed
! Front panel adjustment for manually setting the stage
! Front panel control for setting the SDI-12 address
! Optically isolated 4-20mA output