DAVIS Sensor Mounting Arm User manual

Product#7702
S
ENSOR
M OUNTING
A
RM
The Sensor Mounting Arm provides an ideal mounting location for all of your
Davis weather station sensors. This manual is designed to take you through the
process required to assemble and mount the Sensor MountingArm. Please take
the time to read through this manual before beginning.
C
OMPONENTS
The Sensor Mounting Arm includes the following components. Please make
sure you have all listed components before continuing.
✦
Sensor Arm
✦
Mounting Bracket
✦ 16.5-foot (5 m) Ground Wire
✦
Installation Hardware Kit
a.
One 3/8” Cable Clamp
b.
Four 3/16” Cable Clamps
c.
Three 3/8” Cable Ties
d.
Four 1/4” x 1-1/2”
(38 mm) Lag Screws
e.
Eleven #8 Flat Washers
f.
Six #8 Split Lock Washers
g.
Six #8-32 Hex Nuts
h.
Eight 1/4” Flat Washers
i.
Eight 1/4” Split Lock
Washers
j.
Eight 1/4”-20 Hex Nuts
k. Four 5/16” Flat Washers
l.
Four 5/16” Split Lock
Washers
m.
Four 5/16”-18 Hex Nuts

Page2 SensorMountingArm
n.
Two 1/2” U-Bolts (for
anemometer arm)
o. Two 1/2” Saddles
p.
Two 1-1/2” U-Bolts (for
pipe with outside diameter
between 1” and 1-1/4”
(25 mm and 31 mm)
q.
Two 2-1/4” U-Bolts (for
pipe with outside diameter
between1-1/2” and 2-3/8”
(38 mm and 60 mm)
r.
Two 2-1/4” Saddles
s.
Three #8-32 x 3/4”
(19 mm) Screws
t.
Two #8-32 x 2 -1/2”
(64 mm) Screws
T
OOLS AND
M
ATERIALS
N
EEDED
In addition to the components listed above, you will need some of the follow-
ing tools and materials. Please be sure you have everything you need before
beginning the installation.
✦
Medium Phillips Screwdriver
✦
Wrench or Pliers
✦
11/32” (9 mm) Nut Driver or Socket Wrench
If mounting the anemometer on the same side as the Radiation Shield.
A
SSEMBLING THE
S
ENSOR
M
OUNTING
A
RM
The assembly of the sensor arm involves attaching the mounting bracket and
then attaching all desired sensors. Instructions for attaching sensors (other than
the anemometer) to the Sensor Mounting Arm are contained in the manual for
that sensor or for the accessory which allows that sensor to be attached (such as
the Radiation Shield or the Rain Collector Shelf). The Sensor Mounting Arm
includes provisions for attaching the following sensors:
✦
Anemometer
✦
External Temperature Sensor, External Temperature/Humidity Sensor, or Stainless
Steel Temperature Probe (with Radiation Shield or Solar-Fan-Aspirated Radiation
Shield)
✦
Rain Collector (with Rain Collector Shelf)
✦
UV Sensor (with or without Tilting Mechanism)
✦
Solar Radiation Sensor (with or without Tilting Mechanism)

AssemblingtheSensorMountingArm Page3
The Sensor Arm
The illustration below shows the sensor arm and indicates which holes are
used by the various sensors, brackets, and accessories.
S
ENSOR
A
RM
H
OLE
A
SSIGNMENTS
Typical Sensor Mounting Arm Installation
The illustration below shows a typical Sensor Mounting Arm installation
with all possible sensors attached to the sensor arm.
T
YPICAL
S
ENSOR
M
OUNTING
A
RM
I
NSTALLATION

Page4 SensorMountingArm
A
TTACHING THE
M
OUNTING
B
RACKET
In order to attach the mounting bracket to the sensor arm, you will need the
sensor arm, mounting bracket, two #8-32 x 2-1/2” screws, four #8 flat washers,
two #8 split lock washers, and two #8-32 hex nuts.
1. Place one #8 flat washer over the end of each of the #8-32 x 2-1/2” screws.
2. Position the mounting bracket so the holes in the mounting bracket line up with the
appropriate holes on the sensor arm.
3. Slide each of the #8-32 x 2-1/2” screws (with washer) through the holes on the sensor
arm and the mounting bracket.
4. Secure the mounting bracket to the sensor arm using a #8 flat washer, #8 split lock
washer, and a #8-32 hex nut on each screw end.
Tighten until the mounting bracket is securely fastened to the sensor arm.
A
TTACHING THE
M
OUNTING
B
RACKET

AttachingtheAnemometer Page5
A
TTACHING THE
A
NEMOMETER
You may mount the anemometer on either side of the sensor arm. The pre-
ferred mounting location for the anemometer is on the end closest to the
mounting bracket. However, if you have an anemometer with a straight arm
and a Rain Collector attached to the Sensor Mounting Arm, the Rain Collector
might create obstruction problems which result in inaccurate wind speed and
direction readings. In this case (and only in this case), you may want to mount
the anemometer on the end farthest from the mounting bracket.
In general, you should mount the anemometer below the sensor arm, following
the instructions in “Attaching the Anemometer Below the Sensor Arm (Pre-
ferred)” on page 6. If, however, you need to mount the anemometer arm on the
end farthest from the mounting bracket and you have a radiation shield
mounted on that side as well, attach the anemometer above the sensor arm, fol-
lowing the instructions in “Attaching the Anemometer Above the Radiation
Shield” on page 9.
T
YPICAL
A
NEMOMETER
M
OUNTS

Page6 SensorMountingArm
Attaching the Anemometer Below the Sensor Arm (Preferred)
To attach the anemometer below the sensor arm, you will need the anemome-
ter, sensor arm, two 1/2” U-bolts, two 1/2” saddles, four 1/4” flat washers,
four 1/4” split lock washers, four 1/4” hex nuts, one cable clamp, one #8-32 x
3/4” screw, one #8 flat washer, and one #8-32 hex nut.
A NEMOMETER A TTACHED B ELOW S ENSOR A RM
1. If necessary, disconnect the anemometer from your weather station.
Your weather station manual contains instructions for connecting the two.
Simply reverse the directions to disconnect them.
2. If necessary, disconnect the anemometer arm from the anemometer base.
Your weather station manual contains instructions for connecting the two.
Simply reverse the directions to disconnect them.
3. Place one of the 1/2” U-bolts over the anemometer arm.
4. Slide one of the saddles over the end of the U-bolt so the anemometer arm is con-
tained in the circle created by the U-bolt and the saddle.
P LACE U-B OLT AND S ADDLE ON A NEMOMETER A RM
5. Repeat this process for the other 1/2” U-bolt and saddle.

AttachingtheAnemometer Page7
6. Slide the ends of the U-bolts into the appropriate holes at the end of the sensor arm
nearest the mounting bracket.
S
LIDE
U-B
OLTS INTO
H
OLES
7. Secure the U-bolts and anemometer arm in place using a 1/4” flat washer, 1/4” split
lock washer and 1/4” hex nut on each of the U-bolt ends.
Tighten the hex nuts with your hand so the arm is gently held in place. Do
not tighten fully until instructed to do so later on.
A
TTACH THE
U-B
OLTS AND
A
NEMOMETER
A
RM

Page8 SensorMountingArm
8. Slide the anemometer arm backwards/forwards until the end of the anemometer arm
extends just 1/2” (13 mm) past the second U-bolt/saddle.
P
OSITION
A
NEMOMETER
A
RM
9. Once the anemometer arm is correctly positioned, tighten the hex nuts.
In order to keep the anemometer arm steady in high winds, tighten the hex
nuts until you notice the anemometer arm just begin to buckle underneath
the U-Bolt.
10.Place a cable clamp around the anemometer cable.
11. Slide a #8-32 x 3/4”screw down through the indicated hole on the sensor arm.
A
TTACH THE
C
ABLE
C
LAMP
12. Slide the hole in the cable clamp over the end of the #8-32 x 3/4” screw.
13. Secure the cable clamp and cable in place using an #8 flat washer and an #8-32 hex
nut.
Tighten the hex nut until the cable is held snugly within the cable clamp.

AttachingtheAnemometer Page9
Attaching the Anemometer Above the Radiation Shield
To attach the anemometer above the sensor arm, you will need the anemome-
ter, sensor arm, two 1/2” U-bolts, two 1/2” saddles, four 1/4” flat washers,
four 1/4” split lock washers, four 1/4” hex nuts, one cable clamp, one #8-32 x
3/4” screw, one #8 flat washer, and one #8-32 hex nut.
A
NEMOMETER
A
TTACHED
A
BOVE
S
ENSOR
A
RM
1. If necessary, remove the Radiation Shield from the sensor arm.
You cannot mount the anemometer above the Radiation Shield if the radia-
tion shield has already been attached to the sensor arm.
2. If necessary, disconnect the anemometer from your weather station.
Your weather station manual contains instructions for connecting the two.
Simply reverse the directions to disconnect them.
3. If necessary, disconnect the anemometer arm from the anemometer base.
Your weather station manual contains instructions for connecting the two.
Simply reverse the directions to disconnect them.
4. Place one of the 1/2” U-bolts over the anemometer arm.
5. Slide one of the saddles over the end of the U-bolt so the anemometer arm is con-
tained in the circle created by the U-bolt and the saddle.
P
LACE
U-B
OLT AND
S
ADDLE ON
A
NEMOMETER
A
RM
6. Repeat this process for the other 1/2” (13 mm) U-bolt and saddle.

Page10 SensorMountingArm
7. Position the U-bolts/saddles on top of the sensor arm on the side farthest from the
mounting bracket so the ends of the U-bolts drop into the appropriate holes.
S LIDE U-B OLTS INTO HOLES
8. While holding the U-bolts in place, turn the sensor arm over so the protruding ends
of the U-bolts are visible.
9. Secure the U-bolts and anemometer arm in place using a 1/4” flat washer, 1/4” split
lock washer and 1/4” hex nut on each of the ends of the U-bolts.
Tighten the hex nuts with your hand so the arm is gently held in place. Do
not tighten fully until instructed to later on.
ATTACH THE U-BOLTS AND ANEMOMETER ARM