SENSORS - Climatronics

SENSORS - Climatronics
SENSORS
MANUAL - F460 WIND SPEED SENSOR P/N M100075 Rev E
1.0 INTRODUCTION
The F460 Wind Speed Sensor, P/N 100075, is
designed to provide low starting threshold, wide
dynamic response and high accuracy over a wide
range of wind speeds and a variety of
environmental conditions.
Note:Some Anti-Seize compound on the set
screws will facilitate disassembly if it becomes
necessary.
1.1 SPECIFICATIONS
Accuracy: + 0.07 m/s (0.15 mph) or + 1.0%,
whichever is greater
Threshold: 0.22 m/s (0.5 mph)
Distance Constant:
Lexan: <1.5 m (4.9 ft) of air maximum
Heavy Duty: <4 m (13.1 ft.) of air maximum
Operating Range: 0-56 m/s (0-125 mph)
Operating Temp: -40° to 60°C (-40° to 140°F)
Power Requirement: +5 to +14Vdc @ 1 mA
Signal Output: 5 Vpp freq. proportional to WS
Output Impedance: 4.7K Ohm
Dimensions:
Diameter: 5.7 cm (2.25 inch)
Height: 29.2 cm (11.50 inch)
Weight: less than 2 lbs. (0.9 kg)
Turning Radius: 3.75 inch (9.5 cm)
Anemometer Cup Transfer Functions:
Lexan: Freq(Hz) = (mph - 0.3) x 9.511
Heavy Duty: Freq(Hz) = (mph - 0.5) x 9.511
SS: Freq(Hz) = (mph - 0.5) x 10.425
Figure 1
Cupset Hub
(Cups Not Shown)
Shaft
Shaft Hub
2.0 INSTALLATION
The sensor mounts to the Prewired F460
Crossarm, P/N 101994. Refer to the 101994
manual for proper installation instructions. Be
sure the Sensor is located in a clear,
unobstructed area to minimize any turbulent
effects caused by obstructions (e.g., - trees,
buildings, etc.)
The sensor mounts on the Crossarm by
matching the connector keys and the notch on
the lower part of the Sensor body to the
alignment pin of the Crossarm. Secure the
Sensor by tightening the two set screws located
at the base of the Sensor. The cup set attaches to
the Sensor by matching the groove in the cup
assembly hub to the shaft hub and lightly
tightening the set screws.
Transmitter
Connector
Key
Sensor
Housing
Shaft
CLIMATRONICS CORPORATION
Figure 2
(631) 567-7300
3.0 INPUT/OUTPUT CONNECTIONS
7.0 CALIBRATION
PIN
A
B
C
D
E
F
The sensor by itself does not require calibration.
However, Climatronics can provide NIST
traceable calibration in our wind tunnel for your
sensor and cup assembly combination. Please
contact the factory for further details.
FUNCTION
WS Frequency Output
+V In
Ground
Not Used
Not Used
Not Used
4.0 USER DEFINED OPTIONS
Both internal and external sensor heaters are
available. The internal heater is a continuously
operating device which consumes 2W per sensor
of the 12 Vdc sensor power. This heater option
is designed to minimize internal moisture
buildup and requires factory installation. The
external heater is thermostatically controlled and
is designed to minimize sensor freeze-up in cold
environments. This heater option is powered by
110 Vac, requires approximately 20W per
sensor, and may be added by the user as a field
modification.
5.0 USER INTERFACE
N/A
6.0 THEORY OF OPERATION
A lightweight, chemically etched disk divided
into 30 sections rotates with the cup set. As the
disk rotates, the light path between an IR LED
and a phototransistor is alternately blocked and
left clear. The Wind Speed Amplifier, P/N
102499 (101080), is located in the main body of
the Sensor. To gain access to the Amplifier, the
cover must be removed by pulling it toward the
base with a slight twisting motion. Drawing
No. 401467 (Section 9.0) is a schematic diagram
of the Amplifier. U1 is a voltage regulator
supplying regulated 5 volts to the circuit. Current
flows through LED CR1 causing it to emit
energy in the infrared region. The energy strikes
phototransistor Q1 whenever a hole in the
chopper passes in front of CR1. The resulting
change in the collector voltage of Q1 is
amplified by U2. The output of U2 is a 5 volt
square wave. Resistors R7 and R8 along with
Transzorb CR3 protect the circuitry from voltage
transients.
8.0 MAINTENANCE
The only maintenance required is to periodically
check the bearing wear. This is easily done with
Climatronics' Wind Speed Sensor Torque
Meter, P/N 101257. Should it become necessary
to replace the bearings, proceed as follows.
Both bearings should be replaced if replacement
is necessary. Drawing No. 100075 (Section 9.0)
will help in locating the parts described below.
Read through the whole procedure before
starting.
1. Remove the cup assembly, by loosening the 2
set screws which holds it to the sensor shaft.
2. Remove the 2 screws holding the PCB, and
move it away from the shutter.
3. Remove the two flat head screws holding the
column assembly to the support and remove the
column assembly.
4. Loosen the two set screws that hold the cap in
place and remove the cap. Replace worn set
screws, lubricate with anti-seize compound.
5. Remove the retaining ring from the top of the
shaft with retainer ring pliers or a small pen
knife. If the ring is bent, it must be replaced.
6. Allow the shaft to slide out through the open
end of the column, being careful not to damage
the shutter.
7. Remove and discard the old bearings.. It may
be necessary to push the bearings out from the
bottom of their sets with a long thin rod such as
the shaft assembly. Pushing lightly all around
the bearing is better than putting too much
pressure on one side of the bearing.
8. Replace the spacer that was closest to the
shutter on the shaft.
CLIMATRONICS CORPORATION
(631) 567-7300
9. Place a new bearing on the shaft and guide
the shaft back into its hole from the bottom until
the bearing is seated. When the bearing is
seated, the retainer ring groove will be visible at
the top of the transmitter.
10. Hold the shaft in place from the bottom,
being careful not to damage the shutter, and
place a new bearing over the top of the shaft and
press it down into its seat.
11. Replace the spacers on top of the bearing
and then replace the retainer ring. If retainer
ring pliers are not available, a small knife can be
used to expand the retainer ring.
12. Replace the cap and screw the column back
onto the transmitter. (Use thread locking
compound under the flat head screws).
If the shaft assembly is to be replaced, the
procedure is the same as outlined above, except
that the spacers cannot necessarily be replaced as
above. The lower spacer (one next to shutter) is
always a 0.010 inch thick spacer (P/N SS1-7).
The upper spacers are selected to allow 0.005 to
0.010 inches of shaft end play.
If the end play measurement cannot be made, it
can be assumed to be correct if the shaft has
some end play, and the shutter is free to rotate.
In all cases, a minimum spacer of 0.010 inches
is required at the top of the shaft.
CLIMATRONICS CORPORATION
(631) 567-7300
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