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43347 RTD
User Manual
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Campbell Scientific 43347 RTD User Manual

43347 RTD Temperature Probe,
43502 and 41003-5 Radiation
Shields
Revision: 11/13
Copyright © 1994-2013
Campbell Scientific, Inc.

Warranty

Assistance

Products may not be returned without prior authorization. The following contact information is for US and international customers residing in countries served by Campbell Scientific, Inc. directly. Affiliate companies handle repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company serves
your country.
To obtain a Returned Materials Authorization (RMA), contact CAMPBELL SCIENTIFIC, INC., phone (435) 227-9000. After an application engineer determines the nature of the problem, an RMA number will be issued. Please write this number clearly on the outside of the shipping container. Campbell Scientific’s shipping address is:
CAMPBELL SCIENTIFIC, INC. RMA#_____ 815 West 1800 North Logan, Utah 84321-1784
For all returns, the customer must fill out a “Statement of Product Cleanliness and Decontamination” form and comply with the requirements specified in it. The form is available from our web site at www.campbellsci.com/repair. A completed form must be either emailed to repair@campbellsci.com or faxed to (435) 227-9106. Campbell Scientific is unable to process any returns until we receive this form. If the form is not received within three days of product receipt or is incomplete, the product will be returned to the customer at the customer’s expense. Campbell Scientific reserves the right to refuse service on products that were exposed to contaminants that may cause health or safety concerns for our employees.

Table of Contents

PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections.
1. General ........................................................................1
2. Specifications .............................................................2
3. Installation...................................................................3
3.1 Siting ....................................................................................................3
3.2 Assembly and Mounting ......................................................................3
3.3 43502 Radiation Shield Installation .....................................................3
3.4 41003-5 Radiation Shield Installation..................................................5
4. Wiring........................................................................... 7
4.1 43347-VX Temperature Probe Wiring.................................................7
4.2 43502 Aspirated Radiation Shield Wiring ...........................................8
5. Datalogger Programming for the 43347-VX Probe ..9
5.1 Programming for Calibrated 43347-VX Probes.................................10
5.1.1 CR1000 Example for Calibrated 43347-VX Probes...................10
5.1.2 CR10X Example for Calibrated 43347-VX Probes ....................11
5.2 Programming for Uncalibrated 43347-VX Probes.............................12
5.2.1 CR1000 Example for Uncalibrated 43347-VX Probes ...............12
5.2.2 CR10X Example for Uncalibrated 43347-VX Probes ................13
6. 43347-IX Measurement using Current Excitation ..13
6.1 Wiring ................................................................................................13
6.2 Datalogger Programming...................................................................14
6.2.1 Datalogger Programming for Calibrated 43347–IX Probes........15
6.2.2 Datalogger Programming for Uncalibrated 43347-IX Probes.....16
6.3 Resistance Measurement Instruction Details......................................17
6.3.1 Determining the Excitation Current............................................17
6.3.2 Reducing Measurement Noise ....................................................18
7. Maintenance ..............................................................18
8. 43347 RTD Temperature Probe Calibration............ 19
9. Manufacturer’s Information .....................................19
10. Troubleshooting........................................................19
i
Table of Contents
11. References.................................................................19
Appendices
A.
Example CR10(X) Program for Ice Bath
Calibration .............................................................A-1
B. 43502 Aspirated Radiation Shield .........................B-1
C. 43347 Aspirated Radiation Shield .........................C-1
C.1 Specifications .................................................................................. C-2
C.2 Installation....................................................................................... C-3
D. Measure Two 43347-IX Probes Using One
Current Excitation Channel .................................D-1
D.1 Wiring..............................................................................................D-2
D.2 Example Program for two Calibrated 43347-IX Probes.................. D-2
Figures
Tables
3-1. 43502 Radiation Shield mounted to tripod mast ................................. 4
3-2. 43502 Radiation Shield mounted to a CM200-series Crossarm.......... 5
3-3. 41003-5 Radiation Shield mounted to tripod mast.............................. 6
3-4. 41003-5 Radiation Shield mounted to a CM200-series Crossarm....... 6
4-1. 43347-VX Temperature Probe wiring................................................. 7
4-2. 43502 Aspirated Shield wiring............................................................ 8
6-1. 43347-IX Temperature Probe schematic........................................... 14
B-1. 43347 probe and bushing................................................................. B-2
B-2. 43347 probe mounted inside the 43502 shield ................................ B-2
C-1. 43347 RTD Temperature Probe and 43408 Aspirated Radiation
Shield ........................................................................................... C-2
C-2. PN 7515 10 m Aspirated Shield Mounting Bracket ........................ C-3
C-3. 43408 Aspirated Radiation Shield wiring........................................ C-4
D-1. Schematic for Two 43347-IX Temperature Probes......................... D-2
4-1. Datalogger Connections ...................................................................... 8
4-2. 43502 Blower/Tachometer Connections ............................................. 9
5-1. Wiring for Measurement Examples................................................... 10
6-1. Datalogger Connections .................................................................... 14
6-2. Wiring for Measurement Examples................................................... 15
D-1. Wiring for Two 43347-IX Probes Example .................................... D-3
ii
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields

1. General

The -L option on the model 43347 RTD Temperature Probe (43347-L), and the 43502 Aspirated Radiation Shield (43502-L) indicates that the cable length is user specified. This manual refers to them as the 43347 probe and the 43502 radiation shield.
The 43347 is a 1000 ohm Resistance Temperature Device (RTD) used to measure ambient air temperature and delta or gradient air temperature. The standard 43347 probe has an uncertainty of ±0.3°C. For increased accuracy, the 43347 probe can be ordered with a three point calibration with an uncertainty of ±0.1°C.
There are two cable options for the 43347. Option –VX configures the probe as a 4-wire half bridge that requires a voltage excitation and two differential input channels, and can be used with all CSI dataloggers except the CR200(X). Option –IX configures the probe for use with the CR3000 or CR5000 dataloggers, and requires a current excitation and one differential input channel.
The 43347 can be housed in the 41003-5 naturally aspirated radiation shield, or the 43502 motor aspirated radiation shield. The 43502 radiation shield employs concentric downward facing intake tubes and a small canopy shade to isolate the temperature probe from direct and indirect radiation. The 43347 probe mounts vertically in the center of the intake tubes. A brushless 12 Vdc blower motor pulls ambient air into the shield and across the probe to reduce radiation errors.
The 43502 blower operates off a 115 Vac/12 Vdc transformer that is included with the shield, or from a user-provided 12 Vdc source. The blower has a ‘Tachometer’ output that can be measured with a control port or pulse counter input on the datalogger, and the output frequency stored as part of the data to insure the blower was operational.
Lead length for the 43347 and 43502 is specified when the probe/shield is ordered. Maximum cable length for the 43502 is 75 ft (22.8 m), which is based upon 22 AWG wire, 500 mA current draw, and an allowance for a 1 V voltage drop across the cable. Larger diameter wire could be used for longer cable lengths. With 18 AWG wire, the maximum length is 200 ft (60.9 m).
The 43347 probe ships with:
(1) Instruction Manual
1
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields

2. Specifications

43502 ASPIRATED RADIATION SHIELD
Sensor Types: Accommodates sensors up to 24 mm (0.9 in) diameter
Radiation Error:
Ambient Temp: <0.2°C (0.4°F) RMS (@1000 W/m² intensity)
Delta T: <0.05°C (0.1°F) RMS with like shields equally
exposed
Aspiration Rate: 5 to 11 m/s (16 to 36 fps) depending on sensor size
Power Requirement: 12 to 14 Vdc @ 500 mA for blower
Tachometer Output: 0 to 5 Vdc square wave pulse, 2 pulses per revolution
Approximately 146 Hz (4380 rpm) @ 12 Vdc
Overall Height: 33 cm (13 in)
Overall Diameter: 20 cm (8 in)
Shield: 7 cm (2.7 in) dia. x 12 cm (4.7 in)
Blower Housing: 17 cm (6.7 in) dia. x 11 cm (4.3 in)
Mounting: V-Block and U-Bolt for vertical pipe 25 to 50 mm
(1.0 to 2.0 in) dia.
41003-5 RADIATION SHIELD
Sensor Types: Accommodates temperature and humidity sensors up
to 26 mm (1 in) diameter
Radiation Error: @1080 W/m
0.4°C (0.7°F) RMS @ 3 m/s (6.7 mph)
0.7°C (1.3°F) RMS @ 2 m/s (4.5 mph)
1.5°C (2.7°F) RMS @ 1 m/s (2.2 mph)
Construction: UV stabilized white thermoplastic plates Aluminum mounting bracket, white powder coated Stainless steel U-bolt clamp
Dimensions: 13 cm (5.1 in) diameter x 26 cm (10.2 in) high Mounting fits vertical pipe 25 to 50 mm (1 to 2 in)
diameter
Weight
Net Weight: 0.7 kg (1.5 lb) Shipping Weight: 1.4 kg (3 lb)
43347 RTD TEMPERATURE PROBE
RM Young Model Number: 41342
2
intensity – Dependent on wind speed
2
Dimensions
Probe Tip: 0.125 in diameter, 2.25 in long Overall Length: 7 in
Sensing Element: HY-CAL 1000 ohm Platinum RTD
Temperature Range: ±50°C

3. Installation

3.1 Siting

43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
Accuracy: ±0.3°C at 0° C ±0.1°C with NIST calibration
Temperature Coefficient: .00375 Ω/Ω/°C
Sensors should be located over an open level area at least 9 m (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 (EPA) from large paved areas. Sensors should be protected from thermal radiation, and adequately ventilated.
Standard measurement heights:
1.5 m +/- 1.0 m (AASC)
1.25 to 2.0 m (WMO)
2.0 m (EPA)
2.0 m and 10.0 m temperature difference (EPA)

3.2 Assembly and Mounting

Tools Required:
• 1/2 in. open end wrench
• small screw driver provided with datalogger
• small Phillips screw driver
• UV resistant cable ties
• small pair of diagonal-cutting pliers

3.3 43502 Radiation Shield Installation

The 43502 mounting bracket has a U-bolt configured for attaching the shield to a vertical tripod mast or tower leg up to 2” in diameter. By moving the U-bolt to the other set of holes, the bracket can be attached to a CM200-series crossarm, e.g., the CM204. The CM204 crossarm includes the CM210 Mounting Kit for attaching the crossarm to a tripod mast or tower leg. For triangular towers (e.g., the UT30), an additional pn CM210 Crossarm Mounting Kit can be ordered for attaching the crossarm to two tower legs for additional stability.
Attach the 43502 to the tripod/tower or crossarm using the U-bolt. Tighten the U-bolt sufficiently for a secure hold without distorting the plastic v-block. See the drawings in Appendix B, 43502 Aspirated Radiation Shield, for reference to names and locations of shield components and position of sensor within the shield.
The blower cover is hinged to allow easy access for sensor installation and cable connections. Loosen the captive screw in the blower cover to open. The
3
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
junction box provides terminals for cable connections and properly positions the sensor within the shield assembly.
With the blower cover open connect blower power (12 to 14 Vdc) to the terminals on the underside of the cover (FIGURE B-2). Terminal designations positive (POS), negative (NEG), and optional tachometer (TACH), are marked on the printed circuit board. Blower power is normally provided by the 115 Vac to 12 Vdc plug-in power supply adapter included. BE SURE TO OBSERVE CORRECT POLARITY. Red is positive, black is negative. The blower motor draws approximately 420 mA to 480 mA. Use sufficiently heavy gauge wire between the power supply adapter and the blower motor terminals to avoid significant voltage drop. Clamp the blower power cable with the cable clamp provided at the edge of the printed circuit card. When tying the cable to the mounting structure provide a sufficient loop in the cable to allow the blower cover to be opened and closed easily.
Install the 43347 probe inside the 43502 shield using the sensor mounting bushing (supplied with the 43502) as shown in FIGURE B-1. The sensor cable exits the side of the blower housing at the notches provided using the black grommet to provide a seal (FIGURE B-2). Clamp the cable to the lower flange of the housing to keep it in proper position when the cover is closed. Route the sensor cable to the instrument enclosure. Secure the cable to the tripod/tower using cable ties.
43502 Shield
4
FIGURE 3-1. 43502 Radiation Shield mounted to tripod mast
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
43502 Shield
CM200-series Crossarm
FIGURE 3-2. 43502 Radiation Shield mounted to a CM200-series
Crossarm

3.4 41003-5 Radiation Shield Installation

The 41003-5 Radiation Shield has a U-bolt for attaching the shield to tripod mast / tower leg (FIGURE 3-3) or CM200-series crossarm. The radiation shield ships with the U-bolt configured for attaching the shield to a vertical pipe. Move the U-bolt to the other set of holes to attach the shield it to a crossarm.
NOTE
The split nut that ships with the 41003-5 shield must be replaced with split nut pn 27251 (ordered separately), which has a slightly larger diameter to accommodate the 43347 probe.
Loosen the split-nut on the bottom plate of the 41003-5, and insert the 43347 into the shield. Tighten the split-nut to secure the sensor in the shield. Route the sensor cable to the instrument enclosure. Secure the cable to the tripod/tower using cable ties.
5
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
d
t
41003-5 Shiel
PN 27251 Split Nut
43347 Probe
FIGURE 3-3. 41003-5 Radiation Shield mounted to tripod mast
41003-5 Shield
PN 27251 Split Nu
CM200-series
Crossarm
FIGURE 3-4. 41003-5 Radiation Shield mounted to a CM200-series
Crossarm
6
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