Xylem H-335 - Manual (Page 15)

H-335
H-335 Operation 1-11
Step 8: Slightly loosen the two #4-40 allen socket head screws which retain the ceramic sensor
assembly. Some dams have the tainter gate I-beam located above the platform on the concrete
pier. If you can access the sensor after installation, follow steps 9a-11a. If you cannot access
the sensor when it is bolted to the I-beam, follow steps 9b-11b.
For Installations where the sensor is accessible
Step 9a: Tightly bolt the H-335 to the I-beam with the beam clamps.
Step 10a: Use the data logger or laptop computer to monitor the SensorAngle. Carefully rotate the
internal sensor assembly for the desired value. Make certain the internal ceramic sensor is not
upside down. Sensors mounted such that the inclinometer rotates clockwise as the gate opens
must be set to -34 to -38 . Sensors mounted such that the inclinometer rotates counter-
clockwise as the gate opens must be set to +34 to +38 . The adjustment is quite sensitive and
requires a bit of patience. When the desired setting is reached, tighten the two allen screws.
Step 11a: Re-install the cover and proceed to Step 12. 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.
For Installations where the sensor is NOT accessible
Step 9b: Temporarily rest the H-335 flush against the top of the I-Beam while holding it exactly
vertical.
Step 10b: Use the data logger or laptop computer to monitor the SensorAngle. Carefully rotate the
internal sensor assembly for the desired value. Make certain the internal ceramic sensor is not
upside down. Sensors mounted such that the inclinometer rotates clockwise as the gate opens
must be set to -34 to -38. Sensors mounted such that the inclinometer rotates counter-
clockwise as the gate opens must be set to +34 to +38 . The adjustment is quite sensitive and
requires a bit of patience. When the desired setting is reached, tighten the two allen screws.
The angle setting can be approximate because it is more accurately fine tuned in the next step.
Step 11b: Re-install the cover. 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. Loosely bolt the H-335 to the I-beam with the
beam clamps. While monitoring the SensorAngle fine tune the angle by tapping or prying the
aluminum mounting plate with a screw driver. When the desired angle is obtained, tighten the
beam clamp bolts.