43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields Revision: 11/13 C o p y r i g h t © 1 9 9 4 - 2 0 1 3 C a m p b e l l S c i e n t i f i c , I n c .
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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 3.2 3.3 3.4 Siting ..........................................................................
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 C.2 Specifications .................................................................................. C-2 Installation .............................
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.
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.
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields Accuracy: Temperature Coefficient: 3. ±0.3°C at 0° C ±0.1°C with NIST calibration .00375 Ω/Ω/°C Installation 3.1 Siting 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.
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.
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.
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields 41003-5 Shield PN 27251 Split Nut 43347 Probe FIGURE 3-3. 41003-5 Radiation Shield mounted to tripod mast 41003-5 Shield PN 27251 Split Nut CM200-series Crossarm FIGURE 3-4.
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields 4. Wiring 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 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields TABLE 4-1. Datalogger Connections NOTE 4.
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields TABLE 4-2. 43502 Blower/Tachometer Connections 115 Vac/12 DC Transformer Color 43502 *CR10X *CR1000 Red POS terminal/wire with red heat shrink Black NEG terminal/wire without heat shrink G G White TACH spare terminal Control Port/ Pulse Control Port/ Pulse Clear No Connect terminal/wire without G Ground heat shrink (symbol) * using CSI pn CABLE2CBL-L, or user-provided 2-conductor shielded cable 5.
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields TABLE 5-1.
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.
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields 7: 8: 9: 1 1 0 Loc [ RTD_C ] Mult 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 5: 237.52 C1 6: 12.585 C2 7: 0.0 C3 8: 0.0 C4 9: 0.0 C5 5.
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields 5.2.
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 43347 Terminals Ground CLEAR Current Excite/+ RTD RED Sense Signal WHITE EARTH GND + RTD + SENSE 1000 OHM RTD Sense Signal Ref GREEN Current Return/- RTD BLACK - SENSE - RTD FIGURE 6-1. 43347-IX Temperature Probe schematic TABLE 6-1.
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.
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
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.
43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields Where: ΔT = self heating in °C Ix = current excitation RRTD = 1000 Ω RTD resistance θ = 0.05°C/mW self heating coefficient Solving the above equation for Ix: Ix = (ΔT / RRTD θ)^1/2 To keep self-heating errors below 0.002 °C, the maximum current Ix is: Ix = (.002 °C / (1000 Ω *.05 °C / .
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.
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 bath1 and allow the temperature to stabilize (about an hour).
Appendix A.
Appendix B.
Appendix B. 43502 Aspirated Radiation Shield Grommet Sensor Mounting Bushing FIGURE B-1. 43347 probe and bushing Wiring: TACH – White POS – Red NEG – Black FIGURE B-2.
Appendix C.
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.
Appendix C. 43347 Aspirated Radiation Shield C.2 Installation 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.
Appendix C. 43347 Aspirated Radiation Shield FIGURE C-3.
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).
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. 43347 Terminals Wire Label Ground CLEAR Current Excite/+ RTD RED Sense Signal WHITE Sense Signal Ref GREEN BLACK EARTH GND + RTD + SENSE 1000 OHM RTD Rs #1 1000 OHM RTD Rs #2 - SENSE - RTD 43347 Terminals Ground CLEAR RED Sense Signal WHITE Sense Signal Ref GREEN Current Return/- RTD BLACK EARTH GND + RTD + SENSE - SENSE - RTD FIGURE D-1.
Appendix D. Measure Two 43347-IX Probes Using One Current Excitation Channel TABLE D-1.
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.
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