Xylem H-3311 - Manual (Page 7)

5
Introduction
position count with a software flag or “signature”. If the power is removed momentarily the
H-3301/3311 will resume operation using the current position count. If the power is lost long
enough to destroy the signature, when the power is restored the H-3301/3311 resets the position
count to 0000. To intentionally reset the H-3301/3311’s position count, disconnect the power for
5 to 10 seconds.
A backup battery input is also provided to maintain shaft position during main power interruption
or loss. Any shaft movements while main power is lost will still be recognized and when main
power is restored the measured values will reflect the shaft changes while main power was lost.
Without the backup battery the value would start again at 0.00 plus the current offset value.
With the shaft pointing toward you, rotating the encoder shaft counter-clockwise produces an
increasing (positive) shaft position value. If this is backwards from your needs, either program
the slope with a negative value for SDI-12 applications, or exchange the two quadrature
connections to the shaft encoder for quadrature applications.
The H-3310/3311 is suitable for outdoor environments but must be installed in a protective
enclosure or gauge house. Normally, the housing is screwed or bolted to a shelf in the gauge
station with the pulley and tape protruding over the edge of the shelf above the water. Make
certain the housing is level and the pulley and tape do not rub on any obstructions.
Installation
The H-3301/3311 has both a SDI-12 and quadrature outputs. The H-3301/3311 is an SDI-12
V1.3 compliant sensor. It connects directly to any data recorder with SDI-12 capability. In addition,
the H-3301/3311 provides a raw quadrature output for use with other data recorders having a
quadrature input.
The power for the H-3301/3311 is supplied by the SDI-12 +12V input. Table 1 shows the proper
connections. Refer to the wiring diagram printed on the side of the H-3301/3311 for the connector
pinout.
Making Output Connections
Table 1 Cable Connections
Pin Wire Name
A
B
C
D
E
F
G
Red
Black
Green
Yellow
Orange
Brown
Blue
+12V DC
Ground
Ground
SDI-12 Data
Quadrature Phase A
Quadrature Phase B
Battery Backup