Onset
Computer
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User’s Guide
- 101 -
HOBO U30 Station/RC
Task 4: Mount Cross Arm (Optional)
Onset recommends that you use the cross arm to mount the Wind Speed or Wind Speed/Direction sensor
because it keeps this sensor away from other sensors that could cause wind turbulence or wind shadows.
It is also the best way to ensure the sensor is vertical.
Steps
1.
Attach the cross arm to the upper mast using the two 1/4-20 x 2-3/4 inch hex head bolts. Mount
the cross arm on the side opposite the dimple (at the bottom of the upper mast) with the word
“TOP” on the upper surface of the cross arm.
2.
Pass the two bolts with flat washers on them through the two holes on the cross arm and through
the two holes at the top of the upper mast. Install a nylock nut on each bolt. Do not securely
tighten the bolts yet.
3.
Install the mast plug into the upper mast top with the slot facing down and going over the two
bolts.
Note:
After the mast plug is installed, it should be flush with the top of the mast.
4.
Tighten the two nuts equally.
Figure 32:
Half cross arm (setup is same for full cross arm)
For directions on mounting the Wind Speed sensor to the cross arm, see the sensor manual.
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