43347 RTD Temperature Probe,
43502 and 41003-5 Radiation
Shields
Revision: 11/13
Copyright © 1994-2013
Campbell Scientific, Inc.
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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
4. Wiring
4.1 43347-VX Temperature Probe Wiring
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
The 43347 comes in two versions—the “IX” version and the “VX” version.
The “IX” version connects to dataloggers that can issue current excitation
(CR3000, CR5000 only). The “VX” version can connect directly to
dataloggers that only have voltage excitation (e.g., CR10(X), CR800,
CR1000).
43347 probes with the –VX option are wired to the datalogger as described in
Section 4, Wiring. 43347 probes with the –IX option are wired to the CR3000
or CR5000 dataloggers as described in Section 6, 43347-IX Measurement using
Current Excitation.
The 43347-VX probe is configured as a four wire half bridge as shown in
FIGURE 4-1. Each probe requires two differential inputs and one voltage
excitation channel (one excitation channel can be used for two probes). The
black and orange wires connect to the first of two contiguous input channels.
For example, if channels 1 and 2 are used, the black and orange wires connect
to 1H and 1L respectively, and the white and green wires connect to 2H and 2L
respectively.
Connections to Campbell Scientific dataloggers are given in TABLE 4-1.
When Short Cut software is used to create the datalogger program, wire the
sensor to the channels shown on the wiring diagram created by Short Cut.
Wire Label
Shield CLEAR
Shield G
Volt Excite/+ RTD
+ RTD RED
Sense Signal
+ Sense WHITE
Signal Ref
- Sense GREEN
RTD/Signal/- RTD
- RTD BLACK
RTD Signal Ref
Reference Low ORANGE
Reference
Excitation Return PURPLE
10K 1%
1000 OHM
0.01% 3PPM/C
R
f
43347
Terminals
EARTH GND
+ RTD
+ SENSE
- SENSE
- RTD
1000 OHM
RTD
R
s
FIGURE 4-1. 43347-VX Temperature Probe wiring
7
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
TABLE 4-1. Datalogger Connections
NOTE
Color Wire Label
Red Volt Excite/+ RTD Switched Excitation Switched Excitation
White Sense Signal Differential (high) Differential (high)
Green Sense Signal Ref Differential (low) Differential (low)
Black RTD Signal/- RTD Differential (high) Differential (high)
Orange RTD Signal Ref Differential (low) Differential (low)
Purple Excitation Reference (AG)
Clear Shield G G
Occasionally, a customer may need to connect an “IX” version
of the sensor to a datalogger that has voltage excitation only
(e.g., CR10(X), CR800, CR1000). The customer can do this by
using a 4WPB1K terminal input module (refer to the 4WPB1K
manual for more information).
CR10(X), CR510
4.2 43502 Aspirated Radiation Shield Wiring
The shield includes a 115 Vac/12 Vdc transformer. In most applications AC
power is run to the tower or tripod and terminated in a junction box that is large
enough to house the transformer(s) as shown in FIGURE 4-2.
CR3000, CR1000,
CR800, CR5000
Cable to 43502 Shield
(Refer to FIGURE B-2
for shield connections.)
Transformer Connections:
FIGURE 4-2. 43502 Aspirated Shield wiring
Red – 12V
Black – Ground
User-Provided
Cable to Datalogger
Datalogger Connections:
White – Pulse Input
Black – Ground
8
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
TABLE 4-2. 43502 Blower/Tachometer Connections
Color 43502
Red POS terminal/wire with
Black NEG terminal/wire without
White TACH spare terminal Control Port/
Clear No Connect terminal/wire without
* using CSI pn CABLE2CBL-L, or user-provided 2-conductor shielded cable
115 Vac/12 DC
Transformer
red heat shrink
heat shrink
heat shrink
*CR10X
G G
Pulse
G Ground
*CR1000
Control Port/
Pulse
(symbol)
5. Datalogger Programming for the 43347-VX Probe
This section is for users who write their own datalogger programs. A
datalogger program to measure this sensor can be created using Campbell
Scientific’s Short Cut Program Builder software. You do not need to read this
section to use Short Cut.
This section covers the 43347-VX probe, where the –VX specifies that the
probe/cable is configured for a 4-wire half bridge measurement using an
excitation voltage. Programming examples for the 43347-IX probe are covered
in Section 6, 43347-IX Measurement using Current Excitation.
The 43347 temperature is measured with a four wire half-bridge measurement,
Instruction BRHalf4W in CRBasic dataloggers, or Instruction 9 in Edlog
dataloggers. The measurement applies an excitation voltage and makes two
differential voltage measurements. The first measurement is made across the
fixed resistor (Rf), the second is made across the RTD (Rs). The result is the
ratio of the two resistances (Rs/Rf), which is not affected by lead length.
The result from the measurement is converted to temperature by a custom
polynomial for calibrated temperature probes (Section 5.1, Programming for
Calibrated 43347-VX Probes), or the standard PRT resistance to temperature
conversion for uncalibrated temperature probes (Section 5.2, Programming for
Uncalibrated 43347-VX Probes).
The program examples include instructions to measure and store the
tachometer output frequency (Hz) of the 43502 aspirated radiation shield.
Storing the output frequency is a way to insure the blower is operational.
TABLE 5-1 shows the sensor wiring for the measurement examples in Section 5.1,
Programming for Calibrated 43347-VX Probes, and Section 5.2, Programming for
Uncalibrated 43347-VX Probes.
9
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
TABLE 5-1. Wiring for Measurement Examples
Color Function
Datalogger Channels used for
Measurement Examples
Clear Shield (G) for CR10(X)
Red Switched Excitation E1
White Differential High 2H
Green Differential Low 2L
Black Differential High 1H
Orange Differential Low 1L
Purple Analog Reference (AG) for CR10(X)
43502 Shield
White Tachometer C1, C6 for CR10X
Red *12V Power
Black Ground
*wired to the 115 Vac/12 DC transformer supplied with the
43502, or separate 12 Vdc supply
5.1 Programming for Calibrated 43347-VX Probes
Calibrated 43347 probes are provided with a calibration certificate from R.M.
Young Co. that gives the relationship of resistance to temperature (°C) as
Equation “T”.
T = -250.052585 + R x 2.375187E-1 + R
The measurement result of the instruction with a multiplier of 1.0 and an offset
of 0.0 is R
= the RTD resistance divided by 1000.
s/Rf
5.1.1 CR1000 Example for Calibrated 43347-VX Probes
Because the calibration coefficients are to convert sensor resistance (Rs) to
temperature, the BrHalf4W measurement result (Rs/Rf) must be multiplied by
1000 (Rf), before the coefficients are applied.
'CR1000
'Declare Variables and Units
Public RTD_Res
Public RTD_Cal_C
Units RTD_Cal_C = Deg C
Public 43502_Tach
Units 43502_Tach = Hz
2
x 1.258482E-5
10
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
'Define Data Tables
DataTable(Table1,True,-1)
DataInterval(0,60,Min,10)
Average(1,RTD_C,FP2,False)
Sample (1,43502_Tach,FP2)
EndTable
'Main Program
BeginProg
Scan(5,Sec,1,0)
'Measure 43347 (calibrated) probe and convert Rs/Rf to Rs
BrHalf4W(RTD_Res,1,mV250,mV250,1,1,1,2500,True,True,0,_60Hz,1000,0)
'Apply calibration coefficients (probe specific)
'43347 calibration T=-250.052585+(R*2.375187e-1)+(R^2*1.258482e-5)
RTD_Cal_C = -250.052585+(RTD_Res*2.375187e- 1)+((RTD_Res^2)* 1.258482e-5)
'Measure the 43502 tachometer output
PulseCount (Tach_Hz,1,11,0,1,1.0,0)
'Call Data Tables and Store Data
CallTable(Table1)
NextScan
EndProg
5.1.2 CR10X Example for Calibrated 43347-VX Probes
Because the Full Bridge w/mv Excit (P9) resistance is divided by 1000 (RF),
the coefficients given in Equation “T” can be entered into the polynomial
without exponents. C0 is entered as given, C1 is divided by .001, and C2 is
divided by .000001. For example:
Equation “T” from R.M. Young’s RTD Calibration Report
T= -250.052585
+Rx 2.375187E-01
+R
2
1.258482E-05
Scaled coefficients to be entered into Instruction 55:
C0 = -250.05
C1 = 237.52
C2 = 12.585
;{CR10X}
;
*Table 1 Program
01: 5 Execution Interval (seconds)
;Measure the 43347 probe, result = Rs/Rf
1: Full Bridge w/mv Excit (P9)
1: 1 Reps
2: 24 250 mV 60 Hz Rejection Ex Range ;CR23X (200 mV); 21X,CR7 (500 mV)
3: 24 250 mV 60 Hz Rejection Br Range ;CR23X (200 mV); 21X,CR7 (500 mV)
4: 1 DIFF Channel
5: 1 Excite all reps w/Exchan 1
6: 2500 mV Excitation ;CR23X (2000 mV); 21X,CR7 (5000 mV)
:
11
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
7: 1 Loc [ RTD_C ]
8: 1 Mult
9: 0 Offset
;Apply calibration coefficients (probe specific)
;43347 Calibration T = -250.052585,+(R*2.375187e-1)+(R^2*1.258482e-5)
2: Polynomial (P55)
1: 1 Reps
2: 1 X Loc [ RTD_C ]
3: 1 F(X) Loc [ RTD_C ]
4: -250.05 C0 ;Coefficients will differ for each probe
5: 237.52 C1
6: 12.585 C2
7: 0.0 C3
8: 0.0 C4
9: 0.0 C5
5.2 Programming for Uncalibrated 43347-VX Probes
Instruction 9 applies an excitation voltage and makes two differential
measurements. A multiplier of 1.0 on the four wire half-bridge measurement
converts the measurement result to Rs/Ro (assuming Rf and Ro both equal
1000 ohms). The RTD temperature instruction converts Rs/Ro to temperature
in accordance with DIN Standard 43760. Because the alpha of the RTD used
in the temperature probe differs from DIN standard 43760, a multiplier of
1.0267 is required for Instruction 16.
5.2.1 CR1000 Example for Uncalibrated 43347-VX Probes
'CR1000
'Declare Variables
Public RTD_C
'Define Data Tables
DataTable(One_Hour,True,-1)
DataInterval(0,60,Min,0)
Sample(1,RTD_C,IEEE4)
EndTable
'Main Program
BeginProg
Scan(1,Sec,1,0)
'43347 RTD Temperature Probe (not calibrated) measurement RTD_C:
BrHalf4W(RTD_C,1,mV250,mV250,1,Vx1,1,2500,True,True,0,_60Hz,1,0)
PRT(RTD_C,1,RTD_C,1.0267,0)
'Call Data Tables and Store Data
CallTable(One_Hour)
NextScan
EndProg
12
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
5.2.2 CR10X Example for Uncalibrated 43347-VX Probes
;{CR10X}
;
*Table 1 Program
01: 5 Execution Interval (seconds)
;Measure the 43347 probe, result = Rs/Rf
1: Full Bridge w/mv Excit (P9)
1: 1 Reps
2: 24 250 mV 60 Hz Rejection Ex Range ;CR23X (200 mV); 21X,CR7 (500 mV)
3: 24 250 mV 60 Hz Rejection Br Range ;CR23X (200 mV); 21X,CR7 (500 mV)
4: 1 DIFF Channel
5: 1 Excite all reps w/Exchan 1
6: 2500 mV Excitation ;CR23X (2000 mV); 21X,CR7 (5000 mV)
7: 1 Loc [ RTD_C ]
8: 1 Mult
9: 0 Offset
;Convert measurement result to Temperature deg C
2: Temperature RTD (P16)
1: 1 Reps
2: 1 R/R0 Loc [ RTD_C ]
3: 1 Loc [ RTD_C ]
4: 1.0267 Mult ; (0.00385/0.00375)
5: 0 Offset
3: Pulse (P3)
1: 1 Reps
2: 6 Control Port 6
3: 20 High Frequency, Output Hz
4: 2 Loc [ Tach_Hz ]
5: 1.0 Multiplier
6: 0.0 Offset
6. 43347-IX Measurement using Current Excitation
The 43347-IX probe is measured with the Resistance measurement instruction
with the CR3000 and CR5000 dataloggers. The Resistance measurement
applies a switched current excitation and measures the voltage across the 1000
ohm RTD. Appendix D, Measure Two 43347-IX Probes Using One Current
Excitation Channel, shows how a single current excitation channel can be used
to excite as many as 25 43347 probes connected in series if the excitation
current is 170 μA. Details on determining the excitation current and other
parameter options are described in Section 6.3, Resistance Measurement
Instruction Details.
6.1 Wiring
The 43347-IX probe is configured as shown in FIGURE 6-1. Connections to
the CR3000 and CR5000 dataloggers are shown in TABLE 6-1.
13
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
When Short Cut software is used to create the datalogger program, wire the
sensor to the channels shown on the wiring diagram created by Short Cut.
Wire Label
Ground
Current Excite/+ RTD
Sense Signal
Sense Signal Ref
Current Return/- RTD
CLEAR
RED
WHITE
GREEN
BLACK
43347
Terminals
EARTH GND
+ RTD
+ SENSE
- SENSE
- RTD
FIGURE 6-1. 43347-IX Temperature Probe schematic
TABLE 6-1. Datalogger Connections
Color Wire Label CR3000, CR5000
Red Current Excite/+ RTD Switched Current Excitation
White Sense Signal Differential (high)
Green Sense Signal Ref Differential (low)
1000 OHM
RTD
R
s
Black Current Return/- RTD Switched Current Excitation Return
Clear Ground Ground ( )
White Tachometer
Red *12V power
Black *Gound
*wired to the 115 Vac/12 DC transformer supplied with the 43502, or
separate 12 Vdc supply
NOTE
Occasionally, a customer may need to connect an “IX” version
of the sensor to a datalogger that has voltage excitation only
(e.g., CR10(X), CR800, CR1000). The customer can do this by
using a 4WPB1K terminal input module (refer to the 4WPB1K
manual for more information).
6.2 Datalogger Programming
This section is for users who write their own programs. A datalogger program
to measure this sensor can be created using Campbell Scientifics’ Short Cut
Program Builder software. You do not need to read this section to use Short
Cut.
43502 Shield
14
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
The 43347-IX is measured with the Resistance measurement instruction with
the CR3000 and CR5000 dataloggers. The Resistance measurement applies a
switched current excitation and measures the voltage across the 1000 ohm
RTD. The result, with a multiplier of 1 and an offset of 0, is the RTD
resistance in ohms. The measurement result is converted to temperature with
the PRT instruction for uncalibrated probes, or with a polynomial equation for
calibrated probes. Calibrated probes include a calibration certificate with the
polynomial coefficients.
The Resistance and PRT Instructions with their parameters are listed below:
Resistance(Dest, Reps, Range, DiffChan, IexChan, MeasPEx, EXuA, RevEx,
RevDiff, SettlingTime, Integ, Mult, Offset)
PRT(Dest, Reps, Source, Mult, Offset)
TABLE 6-2 shows the sensor wiring for the measurement examples.
TABLE 6-2. Wiring for Measurement Examples
Color Function CR3000, CR5000
Red Switched Current Excitation IX1
White Differential High 1H
Green Differential Low 1L
Black Excitation Return IXR
Clear Shield
43502 Shield
White Tachometer
Red *12V power
Black *Gound
*wired to the 115 Vac/12 DC transformer supplied with the 43502,
or separate 12 Vdc supply
6.2.1 Datalogger Programming for Calibrated 43347–IX Probes
Calibrated 43347-IX probes are provided with a calibration certificate that
gives the relationship of resistance to temperature as Equation “T”, as shown in
the example below:
2
T = -250.052585 + R x 2.375187E-1 + R
x 1.258482E-5
The measurement result of the Resistance instruction (ohms) is converted to
temperature with a polynomial equation and the coefficients from equation
“T”, as shown below.
The following example program measures a calibrated 43347-IX probe every 1
second and stores a 15 minute average temperature in degrees Celsius.
15
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
'CR3000
'Declare Variables and Units
Public RTD_Res
Public RTD_Cal_C
Public 43502_Tach
Units 43502_Tach = Hz
'Define Data Tables
DataTable(PRT_Data,1,1000)
DataInterval(0,15,Min,1)
Average (1,RTD_Cal_C,IEEE4,False)
Sample (1,43502_Tach,FP2)
Endtable
'Main Program
BeginProg
Scan(1,Sec,10,0)
'Measure the 43347-IX probe
Resistance (RTD_Res,1,mV200,1,Ix1,1,170,True,True,0,_60Hz,1,0)
'Convert RTD resistance to temperature
'43347 calibration T=-250.052585+(R*2.375187e-1)+(R^2*1.258482e-5)
RTD_Cal_C = -250.052585+(RTD_Res*2.375187e- 1)+((RTD_Res^2)* 1.258482e-5)
'Measure the 43502 tachometer output
PulseCount (Tach_Hz,1,11,0,1,1.0,0)
CallTable PRT_Data
Next Scan
EndProg
6.2.2 Datalogger Programming for Uncalibrated 43347-IX Probes
The measurement result of the Resistance instruction with a multiplier of 1.0
and an offset of 0.0 is the RTD resistance in ohms. For uncalibrated probes,
the PRT instruction is used to convert the ratio Rs/Ro to temperature in
accordance with DIN Standard 43760, where Rs is the measured resistance of
the RTD, and Ro is the resistance of the RTD at 0 degrees C (1000 ohms).
Because the alpha of the 43347 is 0.00375 and the alpha of DIN standard is
0.00385, a multiplier of 1.0267 (0.00385/0.00375) is required in the PRT
instruction.
The PRT Instruction with its parameters is listed below:
PRT( Dest, Reps, Source, Mult, Offset )
The following example program measures an uncalibrated 43347-IX probe
every 1 second and stores a 15 minute average temperature in degrees Celsius.
'CR3000
'Declare Variables and Units
Public RTD_Res
Public RTD_RsRo
Public RTD_C
Public 43502_Tach
Units 43502_Tach = Hz
16
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
Const RTD_Ro = 1000.00 'This is the actual RTD resistance for this sensor at 0.0°C
'Define Data Tables
DataTable(PRT_Data,1,1000)
DataInterval(0,10,Min,1)
Average (1,RTD_C,IEEE4,False)
Sample (1,43502_Tach,FP2)
Endtable
'Main Program
BeginProg
Scan(3,Sec,10,0)
'Measure the 43347-IX Probe
Resistance (RTD_Res,1,mV200,1,Ix1,1,170,True,True,0,_60Hz,1,0)
'Convert RTD resistance to temperature
RTD_RsRo = (RTD_Res / RTD_Ro)
PRT (RTD_C,1,RTD_RsRo,1.0267,0.0)
'Measure the 43502 tachometer output
PulseCount (Tach_Hz,1,11,0,1,1.0,0)
CallTable PRT_Data
Next Scan
EndProg
6.3 Resistance Measurement Instruction Details
The Resistance instruction applies a switched current excitation to the 43347
probe, and makes two differential voltage measurements. The first differential
voltage measurement is made across the RTD; the second is made across a
precision 1000 Ω resistor in the CR3000 current excitation circuitry. The
measurement result (X) = Vs/Ix = RTD resistance in ohms, where Vs is the
measured voltage and Ix is the excitation current.
The maximum excitation current is ±2.5 mA. The parameters for the excitation
current, measurement range, differential channel, and options to reverse the
excitation current and switch the differential inputs are configurable, as
discussed in the following sections.
6.3.1 Determining the Excitation Current
Current passing through the RTD causes heating within the RTD, which is
referred to as “self-heating”, resulting in a measurement error. To minimize
self-heating errors, use the minimum current that will still give the desired
resolution. The best resolution is obtained when the excitation is large enough
to cause the signal voltage to fill the measurement range.
The following example determines an excitation current that keeps self-heating
effects below 0.002°C in still air.
Self heating can be expressed as
ΔT = (Ix
2
RRTD) θ
17
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
Where: ΔT = self heating in °C
Ix = current excitation
Solving the above equation for Ix:
RRTD = 1000 Ω RTD resistance
θ = 0.05°C/mW self heating coefficient
Ix = (ΔT / R
To keep self-heating errors below 0.002 °C, the maximum current Ix is:
Ix = (.002 °C / (1000 Ω *.05 °C / .001W)) ^1/2
Ix = 200uA
The best resolution is obtained when the excitation is large enough to cause the
signal voltage to fill the measurement full scale range (the possible ranges are
±5000, 1000, 200, 50 and 20 mV).
The maximum voltage would be at the high temperature or highest resistance
of the RTD. At +40°C, a 1000 Ω RTD with α = 3.75 Ω/°C is about 1150 ohms.
Using Ohm’s law to determine the voltage across the RTD at 40°C.
V = Ix R
Using an Ix value of 200uA, the voltage is:
V = 200uA * 1150 ohms
V= 230mV
RTD
θ)^1/2
This is just over the ±200 mV input voltage range of the CR3000.
Ix = 200mV/1150 ohms
Ix ~170uA
6.3.2 Reducing Measurement Noise
AC power lines, pumps, and motors can be the source of electrical noise. If the
43347 probe or datalogger is located in an electrically noisy environment, the
measurement should be made with the 60 or 50 Hz rejection options.
Offsets in the measurement circuitry may be reduced by reversing the current
excitation (RevEx), and reversing the differential analog inputs (RevDiff), as
shown in the program examples in Section 6.2, Datalogger Programming.
7. Maintenance
Inspect and clean the shield and probe periodically to maintain optimum
performance. When the shield becomes coated with a film of dirt, wash it with
mild soap and warm water. Use alcohol to remove oil film. Do not use any
For a maximum voltage of 200 mV, the current Ix is:
18
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
other solvent. Check mounting bolts periodically for possible loosening due to
tower vibration.
8. 43347 RTD Temperature Probe Calibration
Calibration should be checked every 12 months. Probes used to measure a
temperature gradient should be checked with respect to absolute temperature,
and with respect to zero temperature difference. An excellent discussion on
calibration procedures can be found in the Quality Assurance Handbook for
Air Pollution Measurement Systems, Volume IV Meteorological
Measurements
1
.
9. Manufacturer’s Information
Refer to the RM Young 43502 Instruction Manual for additional information
such as replacement parts, assembly drawings, and electrical schematics.
10. Troubleshooting
-99999, NAN displayed in input location:
11. References
Make sure the temperature probe is connected to the correct input
channels (Section 5, Datalogger Programming for the 43347-VX Probe,
and Section 6, 43347-IX Measurement using Current Excitation). The
input channel (Instruction 9) refers to the channel that the black and
orange wires are connected to. The white and green wires connect to the
next (higher) contiguous channel.
Unreasonable value displayed in input location:
Make sure the multiplier and offset values entered for Instruction 9 are
correct. For calibrated temperature probes (Section 6.1, Wiring), make
sure the coefficients have been properly scaled and entered for Instruction
55. For uncalibrated temperature probes (Section 6.2, Datalogger
Programming), make sure the multiplier and offset values have been
properly entered for Instruction 16.
Temperature reading too high:
Make sure the blower is working properly and there are no obstructions to
the air flow in the sensor shield, telescoping arm, or vent holes. Also,
check that the probe end of the shield points toward the prevailing wind.
1
EPA, (1989). Quality Assurance Handbook for Air Pollution Measurement
Systems Volume IV - Meteorological Measurements, EPA Office of Research
and Development, Research Triangle Park, North Carolina 27711.
19
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
20
Appendix A. Example CR10(X) Program for Ice Bath Calibration
The following program can be used to calibrate 43347 probes (probes ordered
without the 3-point RM Young calibration) for users wanting better than
±0.3°C. The calibration computes a multiplier for the P9 measurement
Instruction (Section 5.2, Programming for Uncalibrated 43347-VX Probes).
Procedure:
Immerse the stainless steel tip of the 43347 probe in a properly prepared ice
1
bath
and allow the temperature to stabilize (about an hour). Program the
CR10X with the program listed below. Toggle Flag 1 high, which causes the
43347 probe to be measured 100 times. The average of the measurement result
is placed into input location 2 and the reciprocal of location 2 is placed into
input location 3. The value from location 3 is used as the multiplier for the P9
Instruction (Section 5.2, Programming for Uncalibrated 43347-VX Probes).
Typical values for locations 2 and 3 would be 1.0012 and 0.998 respectively.
;{CR10X}
;
*Table 1 Program
01: 1 Execution Interval (seconds)
1: If Flag/Port (P91)
1: 21 Do if Flag 1 is Low
2: 0 Go to end of Program Table
2: Z=F (P30)
1: 0 F
2: 0 Exponent of 10
3: 1 Z Loc [ counter ]
3: Beginning of Loop (P87)
1: 1 Delay
2: 100 Loop Count
4: Full Bridge w/mv Excit (P9)
1: 1 Reps
2: 24 250 mV 60 Hz Rejection Ex Range
3: 24 250 mV 60 Hz Rejection Br Range
4: 1 DIFF Channel
5: 1 Excite all reps w/Exchan 1
6: 2500 mV Excitation
7: 2 Loc [ result ]
8: 1.0 Mult
9: 0 Offset
5: Z=Z+1 (P32)
1: 1 Z Loc [ counter ]
A-1
Appendix A. Example CR10(X) Program for Ice Bath Calibration
6: If (X<=>F) (P89)
1: 3 X Loc [ P9_mult ]
2: 3 >=
3: 100 F
4: 30 Then Do
7: Do (P86)
1: 10 Set Output Flag High (Flag 0)
8: Do (P86)
1: 21 Set Flag 1 Low
9: End (P95)
10: Set Active Storage Area (P80)
1: 3 Input Storage Area
2: 2 Loc [ result ]
11: Average (P71)
1: 1 Reps
2: 2 Loc [ result ]
12: Z=1/X (P42)
1: 2 X Loc [ result ]
2: 3 Z Loc [ P9_mult ]
13: End (P95)
A-2
Appendix B. 43502 Aspirated Radiation Shield
43347 RTD Temperature Probe
43347 PROBE
B-1
Appendix B. 43502 Aspirated Radiation Shield
N
Sensor
Mounting
Bushing
Grommet
FIGURE B-1. 43347 probe and bushing
Wiring:
TACH – White
POS – Red
EG – Black
FIGURE B-2. 43347 probe mounted inside the 43502 shield
B-2
Appendix C. 43347 Aspirated Radiation Shield
C-1
Appendix C. 43347 Aspirated Radiation Shield
The 43408 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 temperature 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 temperature probe to reduce radiation errors. The blower operates off a 115
Vac/12 Vdc transformer that is included with the shield.
C.1 Specifications
43408 ASPIRATED RADIATION SHIELD:
DIMENSIONS:
Length: 44 in, extendable to 75 in
Diameter of Blower Housing: 6 in
AIR FLOW RATE:
3 to 7 m/s depending on sensor size
TEMPERATURE RANGE: ±50°C
Blower Housing
POWER REQUIRED:
12 to 14 Vac @ 420 to 480 mA
115 Vac/12 Vdc - 800 mA transformer supplied
RADIATION ERROR:
< 0.2°C radiation @ 1100 W/m
LIFE EXPECTANCY ON BLOWER:
80,000 hrs @ 25°C
FIGURE C-1. 43347 RTD Temperature Probe and 43408 Aspirated
Radiation Shield
2
irradiance
43347 Temperature Probe
and Junction Box
43408 Aspirated
Radiation Shield
C-2
C.2 Installation
Appendix C. 43347 Aspirated Radiation Shield
Refer to the General Assembly drawing in the RM Young 43408 Instruction
Manual (included) for reference to the names of shield components.
Thread the molded shield assembly into the appropriate threaded opening in
the shield mounting tee at the end of the telescoping arm. Hand-tighten the
shield to slightly compress the O-ring seal; do not crossthread or overtighten.
Insert the sensor mounting tube and junction box with its split bushing into the
shield mounting tee. Tighten the threaded split bushing to secure the junction
box in place; do not overtighten.
Two U-bolt brackets attach the radiation shield to horizontal, vertical, or
diagonal tower members up to 2 inches in diameter, spaced 12 to 30 inches
apart. Campbell Scientific pn 7515 10 m Aspirated Shield Mounting Bracket
can be used to mount the shield to a single vertical pipe or mast, as shown in
FIGURE C-2.
The mounting arm should be horizontal with the vent holes facing downward,
with the probe end pointing towards the prevailing wind. Tighten the U-bolt
brackets sufficiently for a secure hold without distorting the plastic v-blocks.
Loosen the band clamp and extend the arm at least 24 inches. Rotate the shield
so the intake tube is oriented vertically with the intake opening facing down.
Tighten the band clamp and secure the sensor lead to the arm using UV
resistant cable ties.
Vent Holes
pn 7515
Junction Box
Intake Tube
FIGURE C-2. PN 7515 10 m Aspirated Shield Mounting Bracket
C-3
Appendix C. 43347 Aspirated Radiation Shield
FIGURE C-3. 43408 Aspirated Radiation Shield wiring
C-4
Appendix D. Measure Two 43347-IX Probes Using One Current Excitation Channel
One current excitation channel can excite multiple 43347 probes if the “Current
Return” wire of the first probe is connected to the “Current Excitation” wire of
the second probe.
In theory, a single Ix channel can excite up to 25 of the 43347-IX probes with
170 µA if all probes are at a temperature less than or equal to 45°C (see
Section 6, 43347-IX Measurement using Current Excitation). At 45°C, the
43347 has a resistance of ~1175 ohms. The resistance increases as more
probes are connected in series. The increase of resistance requires the Ix
channel to raise the driving voltage to maintain the same current. The
maximum voltage the Ix channel can drive is ±5 Vdc. Therefore, the maximum
number of 43347 probes is:
Max. voltage/(current * resistance per probe at 45°C)
5 volts/(0.00017 amps * 1175 ohms) = 25
The CR3000’s differential channel count limits the number of probes to 14
without a multiplexer.
One disadvantage to driving multiple probes with a single Ix channel is that if
one probe shorts or opens then the measurements of all the probes on that Ix
channel will be bad. If, for example, there are two probes at each of three
levels, it might be best to drive one probe from each level on one Ix and then
drive the remaining probes on a second Ix. This creates separate A and B
systems, which allow maintenance to be done on one system while the other
system continues to make good measurements.
D-1
Appendix D. Measure Two 43347-IX Probes Using One Current Excitation Channel
D.1 Wiring
Wiring for two 43347-IX probes is shown in FIGURE D-1.
Wire Label
Ground CLEAR
Cur rent Ex cite/+ RTD RED
Sense Signal WHITE
Sense Signal Ref GREEN
BLACK
Ground CLEAR
RED
Sense Signal WHITE
Sense Signal Ref GREEN
Current Return/- RTD BLACK
43347
Terminals
EARTH GND
+ RTD
+ SENSE
- SENSE
- RTD
43347
Terminals
EARTH GND
+ RTD
+ SENSE
- SENSE
- RTD
1000 OHM
RTD
1000 OHM
RTD
#1
R
s
#2
R
s
FIGURE D-1. Schematic for Two 43347-IX Temperature Probes
D.2 Example Program for two Calibrated 43347-IX
Probes
This section includes an example CR3000 program that measures two
calibrated 43347-IX probes. A CR5000 is programmed similarly. Wiring for
the example program is shown in TABLE D-1.
D-2
Appendix D. Measure Two 43347-IX Probes Using One Current Excitation Channel
TABLE D-1. Wiring for Two 43347-IX Probes Example
Color Function CR3000, CR5000
Probe #1
Red Switched Current Excitation IX1
White Differential High 1H
Green Differential Low 1L
Black Excitation Return Red of Probe #2
Clear Shield
Probe #2
Red Switched Current Excitation Black of Probe #1
White Differential High 2H
Green Differential Low 2L
Black Excitation Return IXR
Clear Shield
White Tachometer C1 for first probe, C2 for second
Red *12V power
Black *Gound
*wired to the 115Vac/12DC transformer supplied with the 43502, or
separate 12Vdc supply
'CR3000 Series Datalogger
'Declare Variables and Units
Public RTD1_Res, RTD1_Cal_C
Public RTD2_Res, RTD2_Cal_C
Public 43502_Tach
Public 43502_Tach_1
Units 43502_Tach = Hz
Units 43502_Tach_1 = Hz
'Define Data Tables
DataTable (PRT_Data,1,1000)
DataInterval (0,15,Min,1)
Average(1,RTD1_Cal_C,IEEE4,False)
Average(1,RTD2_Cal_C,IEEE4,False)
Sample (1,43502_Tach,FP2)
Sample (1,43502_Tach_1,FP2)
EndTable
'Main Program
BeginProg
Scan (1,Sec,0,0)
(2) 43502 Shields
D-3
Appendix D. Measure Two 43347-IX Probes Using One Current Excitation Channel
'Measure the 43347-IX probes
Resistance(RTD1_Res,1,mV200,1,Ix1,1,170,True,True,0,_60Hz,1,0)
Resistance(RTD2_Res,1,mV200,2,Ix1,1,170,True,True,0,_60Hz,1,0)
'Convert RTD resistance to temperature
'43347 #1 calibration T=-250.052585+(R*2.375187e-1)+(R^2*1.258482e-5)
RTD1_Cal_C = -250.052585+(RTD1_Res*2.375187e-1)+((RTD1_Res^2)*1.258482e-5)
'43347 #2 calibration T=-250.152585+(R*2.475187e-1)+(R^2*1.358482e-5)
RTD2_Cal_C = -250.152585+(RTD1_Res*2.475187e-1)+((RTD1_Res^2)*1.358482e-5)
CallTable PRT_Data
'Measure the 43502 tachometer outputs
PulseCount (Tach,1,11,0,1,1.0,0)
PulseCount (Tach_1,1,12,0,1,1.0,0)
NextScan
EndProg
D-4
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