Campbell 27106T User manual

Revision: 01/2023
Copyright © 1984 – 2023
Campbell Scientific, Inc.

Table of contents
1. Introduction 1
2. Precautions 1
3. Initial inspection 1
4. QuickStart 2
5. Overview 5
6. Specifications 5
7. Installation 6
7.1 Wiring 6
7.2 Programming 6
7.2.1 VoltSE() instruction 7
7.2.2 Multiplier and offset 7
7.3 Siting 8
7.4 Assembly and mounting 8
8. Maintenance and troubleshooting 10
8.1 Maintenance 10
8.1.1 Flange bearing replacement 10
8.1.2 Tach-generator replacement 11
8.2 Troubleshooting 12
9. References 12
Appendix A. Importing Short Cut code into CRBasic Editor 14
Appendix B. Example program 15
Table of Contents - i

1. Introduction
The 27106T vertical propeller anemometer is a low threshold precision air velocity sensor that is
especially suited for monitoring the vertical wind component. It connects directly to a Campbell
Scientific data logger, which measures the 27106T signal and converts the signal to engineering
units (mph, m/s, knots).
NOTE:
This manual provides information only for CRBasic data loggers. For retired Edlog data logger
support, see an older manual at www.campbellsci.com/old-manuals .
2. Precautions
lREAD AND UNDERSTAND the Safety section at the back of this manual.
lThe 27106T is a precision instrument. Please handle it with care.
lThe black outer jacket of the cable is Santoprene® rubber. This compound was chosen for
its resistance to temperature extremes, moisture, and ultraviolet (UV) degradation.
However, this jacket will support combustion in air. It is rated as slow burning when tested
according to U.L. 94 H.B. and will pass FMVSS302. Local fire codes may preclude its use
inside buildings.
3. Initial inspection
Upon receipt of your shipment, immediately open the shipping carton and ensure that you have
all of the 27106T components. If an item is not initially visible, remove the foam from the shipping
carton and thoroughly inspect both sides of the foam for the item. Immediately contact
Campbell Scientific if any item is missing.
Make sure you have removed and accounted for all items from the shipping carton before
discarding the shipping foam and shipping carton. The foam can hide some of the items.
27106T Vertical Propeller Anemometer 1

The shipping carton should include:
l16-inch-by-2-inch-by-2-inch box labeled Propeller Anemometer, which contains the
propeller shaft
l9-inch-by-9-inch-by-2-inch box labeled Carbon Fiber Propeller
lCable (routed through the mounting pipe to mating connector)
l3/4-inch IPS threaded pipe
4. QuickStart
A video that describes data logger programming using Short Cut is available at:
www.campbellsci.com/videos/cr1000x-datalogger-getting-started-program-part-3 .Short Cut
is an easy way to program your data logger to measure this sensor and assign data logger wiring
terminals. Short Cut is available as a download on www.campbellsci.com . It is included in
installations of LoggerNet,RTDAQ, or PC400.
Use the following procedure to get started.
1. Open Short Cut and create a new program.
2. Double-click the data logger model.
27106T Vertical Propeller Anemometer 2

3. In the Available Sensors and Devices box, type 27106T. You can also locate the sensor in the
Sensors >Meteorological >Wind Speed & Direction folder. Double-click 27106T Wind
Speed Sensor. The units default to meters/second, which can be changed by clicking the
Wind Speed box and selecting one of the other options.
4. Click on the Wiring tab, wire the sensor, then click OK.
5. Repeat steps three and four for other sensors you want to measure. Click Next.
27106T Vertical Propeller Anemometer 3

6. In Output Setup, enter the scan rate and Data Output Storage Interval.
7. Select the output options.
8. Click Finish and save the program. Send the program to the data logger if the data logger
is connected to the computer.
9. If the sensor is connected to the data logger, check the output of the sensor in the data
display in LoggerNet,RTDAQ, or PC400 to make sure it is making reasonable
measurements.
27106T Vertical Propeller Anemometer 4

5. Overview
The 27106T measures air velocity using a fast-response, four-blade helicoid propeller that drives
a high quality tech-generator transducer. The transducer converts the propeller rotation to a DC
voltage that is linearly proportional to air velocity. The 27106T connects directly to a Campbell
Scientific data logger, which measures the 27106T signal and converts the signal to engineering
units (mph, m/s, knots).
The 27106T is manufactured by R.M. Young (Traverse City, MI) and cabled by Campbell Scientific
for use with our data loggers. The R.M. Young instruction manual includes additional information
on the operating principles, installation, and maintenance of the sensor.
Features:
lEspecially suited for monitoring vertical wind, but can be mounted to monitor the wind in
whatever direction is desired
lCarbon-fiber thermoplastic (CFT) propeller provides greater range and durability than
other propeller anemometers offered by R.M. Young.
lCompatible with Campbell Scientific CRBasic data loggers: CR6, CR1000X, CR800 series,
CR350 series, CR300 series, CR3000, CR1000
6. Specifications
Range
Axial flow: 0 to 40 m/s (0 to 90 mph)
All angles: 0 to 35 m/s (0 to 80 mph)
Threshold sensitivity:10.4 m/s (0.8 mph)
Distance constant:1<2.1 m (6.9 ft)
Pitch: 30.0 cm (11.8 in) air passage per revolution
Signal output: Analog DC voltage proportional to axial wind component. Polarity
reverses with reverse rotation.
1800 rpm (500 mV) = 9.0 m/s (20.1 mph)
Operating temperature: –50 to 50 °C
27106T Vertical Propeller Anemometer 5

Propeller description: 4-blade helicoids propeller molded of carbon fiber thermoplastic
Dimensions
Overall length: 43 cm (17 in)
Propeller diameter: 20 cm (8 in)
Housing diameter: 2.5 cm (1 in)
Mounting pipe description: 12-in. long, 3/4-in. IPS schedule 40 pipe (1.05 in. OD)
Weight: 0.5 kg (1.2 lb)
1Threshold and distant constant values are for axial flows.
7. Installation
If you are programming your data logger with Short Cut, skip Wiring (p. 6) and Programming (p.
6). Short Cut does this work for you. See QuickStart (p. 2) for a Short Cut tutorial.
7.1 Wiring
Connections to Campbell Scientific data loggers are given in Table 7-1 (p. 6).
Table 7-1: Wire color, wire function, and data logger connection
Wire color Wire function Data logger connection terminal
White Signal Uconfigured for single-ended analog input1,
SE (single-ended, analog-voltage input)
Black Signal reference ⏚(analog ground)
Clear Shield ⏚(analog ground)
1Uterminals are automatically configured by the measurement instruction.
7.2 Programming
Short Cut is the best source for up-to-date data logger programming code. If your data
acquisition requirements are simple and you are connecting the sensor to a pulse terminal, you
can probably create and maintain a data logger program exclusively by using Short Cut. If your
data acquisition needs are more complex, the files that Short Cut creates are a great source for
programming code to start a new program or add to an existing custom program.
27106T Vertical Propeller Anemometer 6

NOTE:
Short Cut cannot edit programs after they are imported and edited in CRBasic Editor.
AShort Cut tutorial is available in QuickStart (p. 2). If you wish to import Short Cut code into
CRBasic Editor to create or add to a customized program, follow the procedure in Importing
Short Cut code into CRBasic Editor (p. 14). Programming basics for CRBasic data loggers are
provided in the following sections. A complete program is provided in Example program (p. 15).
Programming basics and programming examples for Edlog data loggers are provided at
www.campbellsci.com\old-manuals .
7.2.1 VoltSE() instruction
The VoltSE() measurement instruction programs the data logger to measure the 27106T.
VoltSE(Dest, Reps, Range, SEChan, MeasOff, SettlingTime, Integ/fnotch, Mult,
Offset)
For Range, use mV2500 (CR300, CR1000) or mV5000 (CR6, CR1000X, CR3000). If the
anemometer will be in electrically noisy environments, use 50Hz or 60Hz rejection for
Integ/fnotch.
7.2.2 Multiplier and offset
The expression for wind speed (U) is:
U = MX + B
Where,
M = multiplier
X = voltage measured by the data logger
B = offset
Table 7-2 (p. 8) lists the multipliers to obtain miles/hour, meters/second, km/hr, and knots. The
helicoid propeller has a calibration that passes through zero, so the offset is zero.
27106T Vertical Propeller Anemometer 7

Table 7-2: Wind speed multiplier1
Unit Multiplier
Miles per hour 0.04025
Meters/Second 0.01800
Kilometers/Hour 0.06480
Knots 0.03496
1When the propeller is used for measuring the vertical wind component, users may want to apply an additional
multiplier of 1.25 to the output signal. This may be done numerically in the data processing operations or
electronically in the signal conditioning. Using the additional multiplier brings the anemometer output signal within
±3% of the cosine response for elevation angles between –30° and 30°. Since the standard deviation of wind
elevation angle in open terrain rarely exceeds 12°, 98% (2.5 standard deviations) of observations will be within ±30°.
Using the multiplier is not necessary when the anemometer is used in a UVW configuration with R.M. Young model
26601UVW Translator.
7.3 Siting
The 27106T should be oriented with the propeller facing the predominant flow of air being
measured. No obstacle should interfere with the vertical air flow from either the up or down
direction.
The propeller responds only to the component of the air flow, which is parallel to the axis of its
rotation. Off-axis response closely approximates a cosine curve with appropriate polarity. With
perpendicular air flow, the propeller does not rotate.
7.4 Assembly and mounting
Materials required:
l5/32-inch hex key wrench
lUV resistant cable ties
lSmall pair of diagonal-cutting pliers
l6-inch to 10-inch torpedo level
lCable (shipped routed through the mounting pipe to mating connector)
l3/4-inch IPS threaded mounting pipe (shipped with the sensor)
l3/4 x 1-inch Nu-Rail crossover fitting
27106T Vertical Propeller Anemometer 8