Xylem H-335 - Manual (Page 10)

1-6 Introduction H-335
1.6 Installation
Since the H-335 is a gravity referenced tilt sensor, it can be installed anywhere on the gate structure. The
H-335 must be installed exactly vertical and in the plane the tainter gate rotates. If the H-335 is not vertical
the senor will suffer an off-axis trigonemetric error as the gate is raised. The mount clamp has a 2-axis
gimbal which allows the inclinometer to be adjusted to compensate for camber in the gate structure.
The best place to install the sensor is near the trunnion bearing between the I-beam of the gate arm and the
concrete pier. Either the left or right arm will work. This location is protected from direct sunlight, logs and
debris, and allows for a short cable. The beam clamps allow easy installation with no drilling and will work
for beams up to 2.0 inches thick. Make certain the cable has sufficient slack for the entire rotation of the
gate.
The UserAngleSlope coefficient in the H-335 must be programmed appropriately depending on whether the
H-335 is installed on the left or right arms of a gate and whether on the inside or outside of the I-beam (see
Figure 2).
1.7 Making Connections to the H-335
Since the H-335 is normally exposed to the sun and weather, a cable rated for water immersion and
sunlight resistance is required. A black urethane or similar sunlight/waterproof rated cable is recommended.
Make certain the power is OFF before making any connections. To access the wiring terminal block, open
the cover of the H-335 by removing the four cover screws. Whenever tightening or loosening the cover
screws, turn each screw only a turn or two at a time. Try to equalize the stress on the lid. This is especially
important when the O-ring in the lid is near full compression.
Make certain the cable properly seals in the grommet of the liquid-tight cable fitting and that the O-ring in
the fitting is tight against the box. The connection must be water tight. Other grommet diameters and
fittings are available from the factory.
The H-335 has a removable 4-pin wiring terminal block for connecting the SDI-12 cable. Unplug the
terminal block and make the connections to the cable. The connections are labeled on the circuit board.
Check to make certain the connections are correct, then plug the terminal block into the H-335 circuit