Campbell Scientific T107 Users manual

Product Manual

Revision: 03/2021

Copyright © 1993 – 2021

Campbell Scientific

CSL I.D - 1367

Guarantee

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



This equipment is guaranteed against defects in materials and workmanship.
We will repair or replace products which prove to be defective during the
guarantee period as detailed on your invoice, provided they are returned to us
prepaid. The guarantee will not apply to:

Equipment which has been modified or altered in any way without the
written permission of Campbell Scientific

Batteries
Any product which has been subjected to misuse, neglect, acts of God or

damage in transit.

Campbell Scientific will return guaranteed equipment by surface carrier
prepaid. Campbell Scientific will not reimburse the claimant for costs incurred

in removing and/or reinstalling equipment. This guarantee and the Company’s

obligation thereunder is in lieu of all other guarantees, expressed or implied,
including those of suitability and fitness for a particular purpose. Campbell
Scientific is not liable for consequential damage.

Please inform us before returning equipment and obtain a Repair Reference
Number whether the repair is under guarantee or not. Please state the faults as
clearly as possible, and if the product is out of the guarantee period it should
be accompanied by a purchase order. Quotations for repairs can be given on
request. It is the policy of Campbell Scientific to protect the health of its
employees and provide a safe working environment, in support of this policy a

“Declaration of Hazardous Material and Decontamination” form will be

issued for completion.

When returning equipment, the Repair Reference Number must be clearly
marked on the outside of the package. Complete the “Declaration of
Hazardous Material and Decontamination” form and ensure a completed copy
is returned with your goods. Please note your Repair may not be processed if
you do not include a copy of this form and Campbell Scientific Ltd reserves
the right to return goods at the customers’ expense.

Note that goods sent air freight are subject to Customs clearance fees which
Campbell Scientific will charge to customers. In many cases, these charges are
greater than the cost of the repair.

Campbell Scientific Ltd,

80 Hathern Road,

Shepshed, Loughborough, LE12 9GX, UK

Tel: [phone]

Fax: [phone]

Email: [e-mail]

www.campbellsci.co.uk

About this manual

Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North
American market. Some spellings, weights and measures may reflect this origin.

Some useful conversion factors:

Area: 1 in2 (square inch) = 645 mm2

Length: 1 in. (inch) = 25.4 mm

1 ft (foot) = 304.8 mm
1 yard = 0.914 m
1 mile = 1.609 km

In addition, while most of the information in the manual is correct for all countries, certain information
is specific to the North American market and so may not be applicable to European users.

Differences include the U.S standard external power supply details where some information (for
example the AC transformer input voltage) will not be applicable for British/European use. Please note,

however, that when a power supply adapter is ordered it will be suitable for use in your country.

Reference to some radio transmitters, digital cell phones and aerials may also not be applicable
according to your locality.

Some brackets, shields and enclosure options, including wiring, are not sold as standard items in the
European market; in some cases alternatives are offered. Details of the alternatives will be covered in
separate manuals.

Part numbers prefixed with a “#” symbol are special order parts for use with non-EU variants or for
special installations. Please quote the full part number with the # when ordering.

Mass: 1 oz. (ounce) = 28.35 g

1 lb (pound weight) = 0.454 kg

Pressure: 1 psi (lb/in2) = 68.95 mb

Volume: 1 UK pint = 568.3 ml

1 UK gallon = 4.546 litres
1 US gallon = 3.785 litres

Recycling information

At the end of this product’s life it should not be put in commercial or domestic refuse but
sent for recycling. Any batteries contained within the product or used during the
products life should be removed from the product and also be sent to an appropriate
recycling facility.

Campbell Scientific Ltd can advise on the recycling of the equipment and in some cases
arrange collection and the correct disposal of it, although charges may apply for some
items or territories.

For further advice or support, please contact Campbell Scientific Ltd, or your local agent.

Campbell Scientific Ltd, 80 Hathern Road, Shepshed, Loughborough, LE12 9GX,

UK Tel: [phone] Fax: [phone]

Email: [e-mail]

www.campbellsci.co.uk

Safety

DANGER — MANY HAZARD S ARE ASSOCIATED WITH INSTALLING, USING, M AINTAINING, AND WORKING ON
OR AROUND TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS,
CROSSARMS, ENCLOSURES, ANTENNAS, ETC. FAILURE TO PROPERLY AND COM P LE TE LY ASS E M BLE ,
INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS, TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED
WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS INJURY, PROPERTY DAMAGE, AND
PRODUCT FAILURE. TAKE ALL REASONABLE PRECAUTIONS TO AVOID THESE HAZARDS. CHECK WITH YOUR
ORGANIZATION'S SAFETY COORDINATOR (OR POLICY) FOR PROCEDURES AND REQUIRED PROTECTIVE
EQUIPMENT PRIOR TO PERFORMING ANY WORK.

Use tripods, towers, and attachments to tripods and towers only for purposes for which they are designed. Do not
exceed design limits. Be familiar and comply with all instructions provided in product manuals. Manuals are
available at www.campbellsci.eu or by telephoning [phone] (UK). You are responsible for conformance
with governing codes and regulati ons, including safety regulati ons, and the integrity and locati on of structures or land
to which towers, tripods, and any attachments are attached. Installation sites should be evaluated and approved by a
qualified engineer. If questions or co ncerns arise regarding installation, use, or maintenance of tripods, towers,
attachments, or electrical connections, consult with a licensed and qualified engineer or electrician.

General

• Prior to performing site or installation work, obtain required approvals and permits. Comply with all
governing structure-height regulations, such as those of the FAA in the USA.

• Use only qualified personnel for installation, use, and maintenance of tripods and towers, and any
attachments to tripods and towers. The use of licensed and qualified contractors is highly recommended.

• Read all applicable instructions carefully and understand procedures thoroughly before beginning work.

• Wear a hardhat and eye protection, and take other appropriate safety precautions while working on or

around tripods and towers.

• Do not climb tripods or towers at any time, and prohibit climbing by other persons. Take reasonable
precautions to secure tripod and tower sites from trespassers.

• Use only manufacturer recommended parts, materials, and tools.

Utility and Electrical

• You can be killed or sustain serious bodily injury if the tripod, tower, or attachments you are installing,
constructing, using, or maintaining, or a tool, stake, or anchor, come in contact with overhead o

nderground utility lines.

u

• Maintain a distance of at least one-and-one-half times structure height, or 20 feet, or the distance
r

equired by applicable law, whichever is greater, between overhead utility lines and the structure (tripod,

tower, attachments, or tools).

• Prior to performing site or installation work, inform all utility companies and have all underground utilities
marked.

• Comply with all electrical codes. Electrical equipment and related grounding devices should be installed
by a licensed and qualified electrician.

r

Elevated Work and Weather

• Exercise extreme caution when performing elevated work.

• Use appropriate equipment and safety practices.

• During installation and maintenance, keep tower and tripod sites clear of un-trained or non-essential

personnel. Take precautions to prevent elevated tools and objects from dropping.

• Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.

Maintenance

• Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks, frayed cables,
loose cable clamps, cable tightness, etc. and take necessary corrective actions.

• Periodically (at least yearly) check electrical ground connections.

WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL
SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER
INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS
SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC.

Table of contents

1. Introduction 1

2. Precautions 2

3. Initial inspection 3

4. QuickStart 6

4.1 User-supplied tools 6

4.2 Supplies for power and communications options 8

5. Siting and exposure 10

5.1 Wind speed and direction 10

5.2 Temperature and relative humidity 11

5.3 Solar radiation 11

6. Installation 12

6.1 Base foundation installation 12

6.2 Pole installation 14

6.2.1 Pole grounding 16

6.3 Enclosure installation 17

6.4 AC power installation procedure 18

6.5 Crossarm installation procedure 20

6.6 Sensor installation 21

6.6.1 RH and temperature radiation shield installation procedure 22

6.6.2 034B Wind Sensor (wind sensor option -MW) 24

6.6.3 WindSonic 2-D Ultrasonic Wind Sensor (wind sensor option -GW) 26

6.6.3.1 Changing the jumper 26

6.6.3.2 WindSonic attachment to crossarm 28

6.6.4 Rain gauge 30

6.6.5 Pyranometer 31

6.6.6 Sensor connections 33

6.6.7 Sensor verification and clock set 34

6.7 Communications peripherals 35

6.7.1 Direct connect to T107 station 35

6.7.2 Phone modem 36

Table of Contents - i

6.7.2.1 Internal installation of phone modem 37

6.7.2.2 External installation of phone modem 38

6.7.3 Short-haul modem 38

6.7.3.1 Internal installation of short haul modem 38

6.7.3.2 External installation of short haul modem 40

6.7.4 Radio 41

6.7.4.1 Example radio configuration and power usage 42

6.7.4.2 Internal installation of the radio 43

6.7.4.3 External installation of the radio 44

6.7.4.4 Base radio installation 50

6.8 Lightning rod installation 51

6.9 Solar panel installation 53

6.10 Battery installation 55

6.11 Restraining cables 56

6.12 Sealing and desiccating the enclosure 58

6.13 T107 software 59

7. Maintenance and troubleshooting 61

7.1 Maintenance 61

7.1.1 Pole maintenance 61

7.1.2 Power supply maintenance 61

7.1.3 Desiccant 61

7.1.4 Sensor maintenance 62

7.1.4.1 Procedure for removing RH chip 65

7.1.5 Data logger module 65

7.2 Troubleshooting 66

7.2.1 No response using the CR1000KD keypad 66

7.2.2 No response from data logger when using a communications peripheral 67

7.2.3 NAN, ±INF, or unreasonable results displayed in a variable or stored in a data
table 68

7.2.4 WindSonic1-ET diagnostic codes 68

8. Schematics of connectors 69

8.1 Sensor schematics 69

8.2 Power schematics 73

8.3 Communications modems schematics 74

Table of Contents - ii

9. References

75

Appendix A. Wind Direction Sensor Orientation

A.1 Determining True North and Sensor Orientation 78

Appendix B. PS24 24 Ah power supply with 10 x 12 inch enclosure 80

B.1 PS24 components 80
B.2 PS24 installation 82

Appendix C. T107 maintenance log 92

76

Table of Contents - iii

1. Introduction

The T107 is an automated weather station designed for irrigation scheduling in turf grass and
commercial agriculture applications. A properly programmed station or software calculates
potential evapotranspiration (ETo), which is the amount of water lost from the soil due to
evaporation and plant transpiration. Calculating the evapotranspiration rate can aid in the
development of an irrigation schedule that provides sufficient water without overwatering.

Section1. Introduction 1

2. Precautions

l READ AND UNDERSTAND the Safety section at the back of this manual.

l DANGER: If any part of the weather station comes in contact with power lines, you could

be killed. Contact local utilities for the location of buried utility lines before digging or
driving ground rods.

l Avoid dangerous electrical accidents when using the AC power option by locating the

transformer remotely and burying a low voltage line to the station. The low voltage will
carry up to 152m (500ft) on an 18 AWG power cable.

l Carefully handle the T107 components during transport, installation, and cleaning.

l Leave the 034B wind vane in the protective cardboard sleeve until it’s ready to be installed.

l Ensure to remove the yellow cap from the RH and temperature sensor, the red or green cap

from the pyranometer, and the rubber band from the tipping bucket mechanism. Save the
caps for shipping or storing the sensors.

l When connecting cables to the enclosure panel, ensure that each plug is completely

seated on the connector and the locking ring is turned a quarter revolution clockwise.
Failure to seat the plug completely could cause corrosion and water damage to both the
enclosure and the cable.

l WARNING: Misuse of the lithium battery in the data logger or installing this lithium battery

improperly can cause severe injury. It is a fire, explosion, and severe burn hazard! Do not
recharge, disassemble, heat above 100 °C (212 °F), solder directly to the cell, incinerate, nor
expose contents to water. Lithium batteries need to be disposed of properly. Refer to Data

logger module (p. 65) for more information.

Section2. Precautions 2

3. Initial inspection

Immediately upon receipt of your shipment:

1. Open shipping carton(s). Solar panel and radio frequency (RF) items (if any) may be packed
in a separate box.

2. Set the large weather station carton down lengthwise on a floor or table top.

3. Position the box as shown in FIGURE 3-1 (p. 3).

4. Cut the tape along the edge of the lower flap first (FIGURE 3-1 (p. 3)).

FIGURE 3-1. Cut flap packing tape

5. Cut the tape around the remaining flaps ensuring to only cut one layer deep.

6. Lift up the cardboard flaps exposing the top layer of foam (FIGURE 3-2 (p. 3)).

FIGURE 3-2. Shipping box packaging

Section3. Initial inspection 3

7. Check contents against invoice and shipping checklist (FIGURE 3-3 (p. 4), FIGURE 3-4 (p.

5)) and contact your Toro representative immediately about any shortages.

8. Securely tape box shut if transporting entire station to another site.

9. If at the main site, remove communications components that are installed at the calling
computer. Repackage remaining components for transport to field site.

FIGURE 3-3. T107 with the Met One 034B-ETM Wind Sensor, top layer

Section3. Initial inspection 4

FIGURE 3-4. T107, bottom layer

Section3. Initial inspection 5

4. QuickStart

In the office, several days prior to the planned installation date, do the following:

1. Collect tools (User-supplied tools (p. 6))

2. Research site (Siting and exposure (p. 10))

3. Install data logger support software (T107 software (p. 59))

Once on site, do the following:

1. Locate suitable site (Siting and exposure (p. 10)).

2. Prepare concrete base and allow the concrete base to cure a minimum of seven days (Base

foundation installation (p. 12))

3. Install the T107 pole (Pole installation (p. 14)).

4. Place instrumentation enclosure on the T107 pole, slide the enclosure to the top of the
pole, and secure it with the correct orientation (Enclosure installation (p. 17)).

5. Install the crossarm and sensors (Crossarm installation procedure (p. 20) and Sensor

installation (p. 21)).

4.1 User-supplied tools

The following tools are used for the base and pole installation.

Shovel

Rake

Open end wrenches: 10 mm (3/8 in), 11 mm (7/16 in), 13 mm (1/2 in), two 14 mm (9/16 in)

Magnetic compass

2 m (6 ft) step ladder

Tape measure: 4 to 6 m (12 to 20 ft)

Claw hammer

Level: 60 to 90 cm (24 in to 36 in)

Hand saw

Materials for concrete form:

Section4. QuickStart 6

(4) 2.5 cm x 5 cm x 30 cm (1 in x 2 in x 12 in) stakes

(2) 5 cm x 10 cm x 240 cm (2 in x 4 in x 96 in) lumber

(12) 8p double-head nails

(8) 16p double-head nails

6 m (20 ft) form wire

0.5 m (0.5 yard) concrete

Concrete trowel, edger

Electrical fish tape or 6 m (20 ft) of small diameter rope

Wheelbarrow

The following tools are needed for instrumentation and maintenance.

Lock and key for enclosure

Magnetic declination angle

Magnetic compass

Straight bit screwdrivers (small, medium, large)

Phillips-head screwdrivers (small, medium)

Small diagonal side-cutters

Needle-nose pliers

Wire strippers

Pocket knife

Calculator

Volt / ohm meter

Electrical tape

2 m (6 ft) step ladder

Station manuals

Station log and pen

Open end wrenches: 10 mm (3/8 in), 11 mm (7/16 in), 13 mm (1/2 in), 14 mm (9/16 in), 24 mm
(15/16 in)

Socket wrench and 11 mm (7/16 in) deep well socket

Adjustable wrench

Pliers

Section4. QuickStart 7

Conduit and associated tools (as required)

Felt-tipped marking pen

Claw hammer

Pipe wrench, 305 mm (12 in)

Handheld drill/driver with 10 mm (3/8 inch) hex driver bit

Drill with 6 mm (7/32 in) drill bit

4.2 Supplies for power and communications options

AC Power

Wire, conduit, and junction boxes as needed (FIGURE 4-1 (p. 8)).

FIGURE 4-1. T107 pole installation with currently-available AC power option

NOTE:
User supplies valve box at base of station and weatherproof enclosure for transformer
(FIGURE 4-1 (p. 8)).

Section4. QuickStart 8

Phone Modem

Phone modem at the central computer.

Dedicated single twisted pair with shield phone line to the weather station valve/junction box
(FIGURE 4-1 (p. 8)).

Short-Haul Modem

Direct burial cable with a minimum of two-twisted pairs with shield (minimum five conductors
total) to travel from the weather station to the central computer junction box. Direct burial
armored cable may be required for rocky soils or rodents (Anixter pn F-02P22BPN (phone 847­677-2600)) or equivalent type cable (FIGURE 4-1 (p. 8)).

Radio

Antenna for the T107 station (Yagi antenna recommended). PS24 Power Supply and mounting
kit with hangar if not using AC power (PS24 24 Ah power supply with 10 x 12 inch enclosure (p.

80)).

Section4. QuickStart 9

5. Siting and exposure

DANGER:
If any part of the weather station comes in contact with power lines, you could be killed.
Contact local utilities for the location of buried utility lines before digging or driving ground
rods.

Selecting an appropriate site for the weather station is critical to obtain accurate meteorological
data. In general, the site should be representative of the general area of interest, and away from
the influence of obstructions such as buildings and trees.

The weather station should not be located where sprinkler irrigation water will strike sensors or
instrument enclosure.

Some general guidelines for site selection are listed below, which were condensed from EPA
(1988), WMO (1983), and AASC (1985) publications. See References (p. 75).

5.1 Wind speed and direction

Wind sensors should be located over open, level terrain, and at a distance of at least ten times
(EPA) the height of any nearby building, tree, or other obstruction (FIGURE 5-1 (p. 10)).

FIGURE 5-1. Effect of structure on wind flow

Section5. Siting and exposure 10

5.2 Temperature and relative humidity

Sensors should be located over an open, level area at least 9m (29.5ft) (EPA) in diameter. The
surface should be covered by short grass, or where grass does not grow, the natural earth surface.
Sensors should be located at a distance of at least four times the height of any nearby
obstruction and at least 30m (98.43ft) (EPA) from large paved areas. Sensors should be
protected from thermal radiation and adequately ventilated.

Situations to avoid include:

l large industrial heat sources
l rooftops
l steep slopes
l sheltered hollows
l high vegetation
l shaded areas
l swamps
l areas where snow drifts occur
l low places holding standing water after rains

5.3 Solar radiation

Pyranometers should be located to avoid shadows on the sensor at any time. Mounting it on the
southernmost (northern hemisphere) portion of the weather station will minimize the chance of
shading from other weather station structures. Reflective surfaces and sources of artificial
radiation should be avoided.

Section5. Siting and exposure 11

6. Installation

6.1 Base foundation installation 12

6.2 Pole installation 14

6.3 Enclosure installation 17

6.4 AC power installation procedure 18

6.5 Crossarm installation procedure 20

6.6 Sensor installation 21

6.7 Communications peripherals 35

6.8 Lightning rod installation 51

6.9 Solar panel installation 53

6.10 Battery installation 55

6.11 Restraining cables 56

6.12 Sealing and desiccating the enclosure 58

6.13 T107 software 59

6.1 Base foundation installation

The following components included with the T107 are used for this installation procedure:

(3) 16 mm (5/8 in) anchor L-bolts

(9) 16 mm (5/8 in) nuts

(1) anchor template

The pole attaches to a user-supplied concrete foundation constructed as shown in FIGURE 6-1 (p.

13).

Section6. Installation 12

FIGURE 6-1. T107 pole base installation

1. Construct the concrete form with 5 cm x 10 cm (2 in x 4 in) lumber and 16p nails.

2. Assemble the template and anchor bolts. For each bolt, place two nuts below and one nut

above the template.

3. Clear an area large enough to set the form at the desired elevation.

4. Dig a hole 0.6 m x 0.6 m x 0.6 m (2 ft x 2 ft x 2 ft). Lighter soils may require a deeper hole.

5. About 50 cm (20 in) below the top of the hole, gouge a small cavity in one wall of the hole.
The cavity should be about 10 cm (4 in) deep and just large enough in diameter to insert
one end of the conduit. Make certain the cavity points in the direction from which power
and communications cables will come. For example, the cavity will point towards a valve
box if one is being used.

6. Centre the form over the hole. Adjacent to the form, drive four stakes into the soil. Secure
the levelled form to the stakes with the 8p nails.

7. Cap the ends of the conduit with duct tape.

8. Position the conduit then wire into place by securing the wire to nails in the form.

9. Fill the hole and form with approximately 0.5 m (0.5 yards) of concrete. Screed the
concrete level with the top of the form.

10. Centre the template assembly over the conduit and press into the concrete.

Section6. Installation 13

11. Put 2-by-4 spacers between the template and the top of the form. The bottom of the bolt
threads should be about 1 cm (0.5 in) above the concrete (FIGURE 6-2 (p. 14)). The
template must be level in two dimensions.

FIGURE 6-2. Cut-away view shows anchor bolt and conduit placement in cement pad

12. Use a trowel and edger to finish.

13. Wait 24 hours before removing the concrete form.

14. Wait seven days before mounting the pole.

6.2 Pole installation

The following components included with the T107 are used for this installation procedure:

(1) top pole section (tapered)

(1) base pole section

(6) 5/8-inch washers

(1) 4 m (12 ft), 10 AWG green copper stranded wire

Section6. Installation 14

(1) white pole cap

(1) 6 m (20 ft) communications cable (phone or short haul modem)

(1) 6 m (20 ft) power cable (for AC option only)

(1) 6 x 19 mm (1/4 x 3/4 in) hex head self-drilling screw

The pole provides a support structure for mounting the T107 weather station components. The
pole is designed to withstand winds of 45 m/s (100 mph). The lightning rod assembly is attached
after the instrumentation enclosure is installed.

Use the following procedure to attach the pole to the base (FIGURE 6-3 (p. 15)).

FIGURE 6-3. Transparent view shows raising and grounding the T107 pole

1. Dig a hole close to the concrete base to access the lower conduit opening.

2. From the hole, trench to the power and communications sources.

3. Remove the duct tape from both ends of the conduit.

4. Remove the template.

Section6. Installation 15

5. Follow the ET Station Pole Assembly Instructions
(https://s.campbellsci.com/documents/us/manuals/et-station-pole-assembly-guide.pdf )

to secure the top and base pole sections by using the self-drilling screw provided with the
pole assembly.

6. Cut and save a 23 cm (9 in) piece of 10 AWG ground wire, which will be used to attach the
enclosure ground to the lightning rod assembly.

7. Thread the communications cable, power cable with connector ends of cable out the top of
pole, and grounding wire through the pole and conduit. Electrical fish tape will help. Leave
approximately 1 m (2 ft) of the supplied power and communications cable hanging out of
the top of the pole. Secure all wiring so it doesn’t slip back down through the pole.

NOTE:
Solar panel and radio frequency (RF) options will not have power or communications
cables.

8. Place the white pole cap over the pole end.

9. Raise the pole on a still day.

10. Place a washer on top of the two nuts on each foundation bolt.

11. Taking care not to damage cables between the pole and conduit, raise the pole and lower
it onto the conduit and mounting bolts.

12. Install a washer and nut on each bolt and hand tighten. Check plumb of the pole by
placing a level on the north and east sides of the lower pole section.

13. Adjust the topmost of the two lower nuts (levelling nut) on each bolt as necessary.

14. When plumb is established, lock the levelling nut in place by tightening the lowest nut
against it.

15. Tighten the three top nuts with the wrench.

6.2.1 Pole grounding

The following components included with the T107 are used for this installation procedure:

(1) 4 AWG ground wire

(1) 8 AWG ground wire

(1) copper ground lug, bolt

(1) ground rod, clamp

Use the following procedure to ground the pole (FIGURE 6-3 (p. 15) and FIGURE 6-4 (p. 17)).

Section6. Installation 16

1. Place the ground rod clamp on the ground rod. Secure it about 8 cm (3 in) from the top.
Do this before the rod is driven into the ground. Be careful not to damage the clamp with
the hammer.

2. Taking care not to damage power or communications lines, drive the ground rod close to
the foundation using a fence post driver or sledge hammer. Drive the rod at an angle if an
impenetrable hardpan layer exists. Soften hard clay soils with water if necessary.

3. Strip 3 cm (1 in) of insulation from both ends of the 4 AWG ground cable.

4. Strip 3 cm (1 in) of insulation from the lower end of the 10AWG ground wire.

5. Loosen the set screw on the lug and insert the 4 AWG and 10 AWG wire.

6. Tighten the set screw (FIGURE 6-4 (p. 17)).

7. Loosen the ground rod clamp. Insert the 4 AWG wire. Tighten the clamp (FIGURE 6-4 (p.

17)).

FIGURE 6-4. Close-up of ground rod and 4 AWG cable

6.3 Enclosure installation

The weather station data logger, power supply, sensor connection panel, communications
devices, and data retrieval peripherals are mounted in the T107 enclosure.

Mount the enclosure on the pole as shown in FIGURE 6-5 (p. 18).

Section6. Installation 17

1. Remove the front lid.

2. Remove the connector cover from the back of the enclosure by loosening the Phillips screw
at the bottom of the cover.

3. Loosen the mounting bracket bolts on the back of the enclosure wide enough to slide over
the pole. Slide the enclosure over the pole.

4. Position the enclosure so it faces east for northern latitudes or west for southern latitudes.
The top of the enclosure should be 2 to 2.5 cm (3/4 to 1 in) above the top of the pole
(FIGURE 6-5 (p. 18)).

FIGURE 6-5. Enclosure spacing above pole

6.4 AC power installation procedure

The AC power option includes a 100 to 240 VAC to 24 VDC power supply.

1. Mount the power supply inside a user-supplied junction box according to local electrical
codes.

Section6. Installation 18

CAUTION:
Avoid dangerous electrical accidents when using the AC power option by locating the
transformer remotely and burying a low voltage line to the station. The low voltage will
carry up to 152m (500ft) on an 18 AWG power cable.

2. Shut off 110 VAC power at the main breaker.

3. Connect the primary leads of the power supply to the 100 to 240 VAC power source.

4. Connect a two-conductor cable to the secondary terminals of the power supply.

5. Route the cable from the power supply to the T107 enclosure according to local electrical
codes.

6. Splice the incoming two-conductor cable to the power cable provided with the station. Use
the direct burial splice kit when splices are in a valve box or buried.

CAUTION:
The splice and wire nut must be completely immersed into the silicone gel inside the
splice tube to be waterproof.

7. Connect the power plug to the POWER connector on the back of the enclosure (FIGURE 6-

6 (p. 20)). Ensure that the plug is completely seated on the connector and the locking ring

is turned a quarter revolution clockwise.

Section6. Installation 19

FIGURE 6-6. Position of bulkhead connectors

6.5 Crossarm installation procedure

The crossarm needs to be installed after the enclosure is mounted on the pole. You may need to
temporarily remove the communications option. Mount the crossarm as shown in FIGURE 6-7 (p.

21) without the wind sensor attached.

Section6. Installation 20

Screws 
(4)

FIGURE 6-7. T107 crossarm mounting

1. Adjust the bolts at the base of the pole to vertically level the top section of the mounting
pole.

2. Remove the front lid and the protective connector cover from the back of the enclosure by
loosening the one Phillips screw at the bottom of the cover.

3. Place the crossarm on top of the enclosure, lining up the four threaded holes on the
underside of the arm with the four holes in the top of the enclosure.

4. Attach the arm to the enclosure by inserting and tightening four Phillips head screws
(FIGURE 6-7 (p. 21)).

5. Adjust the position of the enclosure so that the crossarm is oriented along a due north to
due south axis with the rain gauge and solar radiation sensor (pyranometer) on the south
side for northern latitudes and the reverse for southern latitudes.

6.6 Sensor installation

The following components included with the T107 are used for this installation procedure:

(1) T107 crossarm with sensors (FIGURE 6-8 (p. 22))

(1) Met One 034B or WindSonic wind sensor

(1) White mounting shaft for 034B or WindSonic

(1) Radiation shield

Section6. Installation 21

FIGURE 6-8. T107 instrumentation mounted on the T107 pole

6.6.1 RH and temperature radiation shield installation procedure

1. Remove the two knurled thumb screws taped underneath the crossarm.

2. Remove the yellow shipping cap from the end of the temperature/relative humidity sensor
(FIGURE 6-9 (p. 23) and FIGURE 6-10 (p. 23)).

Section6. Installation 22

FIGURE 6-9. Temperature/relative humidity sensor with yellow protective cap

FIGURE 6-10. Temperature/relative humidity sensor without yellow protective cap

3. Insert the temperature/relative humidity into the radiation shield until it stops.

4. Attach the radiation shield to the underside of the crossarm using the two knurled thumb
screws from step 1.

5. Plug cable into the TEMP/RH connector on the enclosure. Ensure that the plug is
completely seated on the connector and the locking ring is turned a quarter revolution
clockwise.

Section6. Installation 23