Campbell 4WPB100 Product Manual
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Campbell 4WPB100 Product Manual

Prt bridge terminal input modules
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Revision: 05/2020
Copyright © 1996 – 2020
Campbell Scientific
CSL I.D - 340

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  • Page 1 Revision: 05/2020 Copyright © 1996 – 2020 Campbell Scientific CSL I.D - 340...
  • Page 3 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”...
  • Page 5 PLEASE READ FIRST 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 in...
  • Page 7 • 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...

  • Page 9: Table Of Contents

    Table of contents 1. Function 2. Specifications 3. Wiring 4. Programming examples 4.1 GRANITE 9/10 program example 4.2 GRANITE 6/CR6 program example 4.3 CR1000X program example 4.4 CR1000 program example 4.5 CR9000X program example 5. PRT in 4-wire half bridge 5.1 Excitation voltage 5.2 Calibrating a PRT Table of Contents - i...

  • Page 11: Function

    It provides completion resistors for resistive bridge measurements, voltage dividers, and precision current shunts. The 4WPB100 and 4WPB1K are used to provide completion resistors for 4 wire half bridge measurements of 100 Ω and 1 kΩ platinum resistance thermometer (PRT), respectively.

  • Page 12: Specifications

    Power rating: 0.25 W Completion resistor Tolerance @ 25 °C: ±0.01% Maximum temperature ±0.8 ppm/°C coefficient Power rating @ 70 °C: 0.25 W EU certificate of conformity: https://s.campbellsci.ceu/documents/eu/compliance/eudoc_ terminal-input-modules.pdf FIGURE 2-1. Circuit schematic 4WPB100, 4WPB1K PRT Bridge Terminal Input Modules...

  • Page 13: Wiring

    It is still possible to use terminal input modules in adjacent terminal blocks if the modules are staggered. This is done by gently bending one module forward and the next terminal backward enough to clear the first module. Continue to alternate the modules as needed. 4WPB100, 4WPB1K PRT Bridge Terminal Input Modules...

  • Page 14: Programming Examples

    Rs_R0 = Rs_R0*100/R0 where R0 is the sensor resistance at 0 °C The following examples are for a 100 Ω PRT and 4WPB100. The excitation voltages used were chosen with the assumption that the temperature would not exceed 50 °C. Calculation of...

  • Page 15: Granite 9/10 Program Example

    " " ,CPI_BUSA+1) 'Main Scan Scan (5,Sec,1,0) 'Half Bridge, 4-wire measurements on the VOLT 108 CDM_BrHalf4W (VOLT108,CPI_BUSA+1,Rs_R0,1,mV1000,mV1000,1,1,1,400, _  True,True,500,60,1,0) 'PRT temperature calculation PRTCalc (Temp_C_4wire,1,Rs_R0,0,1.0,0) 'Call Data Tables and Store Data CallTable Hourly NextScan EndProg 4WPB100, 4WPB1K PRT Bridge Terminal Input Modules...

  • Page 16: Granite 6/Cr6 Program Example

    CRBasic Example 3: CR1000X 4-wire half bridge example 'CR1000X-series data logger 4-wire half bridge Public Rs_R0, Temp_C DataTable (Hourly,True,-1) DataInterval (0,60,Min,0) Average (1,Temp_C,IEEE4,0) EndTable BeginProg Scan (1,Sec,0,0) BrHalf4W (Rs_R0,1,mV1000,mV1000,1,Vx1,1,400,True ,True ,0,250,1.0,0) PRTCalc (Temp_C,1,Rs_R0,0,1,0) CallTable Hourly NextScan EndProg 4WPB100, 4WPB1K PRT Bridge Terminal Input Modules...

  • Page 17: Cr1000 Program Example

    CRBasic Example 5: CR9000X 4-wire half bridge example 'CR9000X data logger 4-wire half bridge Public Rs_Ro, Temp_F DataTable (Temp_F,1,-1) DataInterval (0,0,0,10) Sample (1,Temp_F,FP2) EndTable BeginProg Scan (1,mSec,0,0) BrHalf4W (Rs_Ro,1,mV1000,mV1000,4,1,5,7,1,400,True,True,30,40,1.0,0) PRTCalc (Temp_F,1,Rs_Ro,0,1.8,32) CallTable Temp_F NextScan EndProg 4WPB100, 4WPB1K PRT Bridge Terminal Input Modules...

  • Page 18: Prt In 4-Wire Half Bridge

    R or R The properties of the 10 kΩ resistor do not affect the result. The purpose of this resistor in the circuit is to limit current. 4WPB100, 4WPB1K PRT Bridge Terminal Input Modules...

  • Page 19: Excitation Voltage

    Small variations in sensor resistance do not cause significant differences in the calculated maximum excitation voltage. For example, changing the sensor resistance to 84 Ω when used with the 4WPB100 reduces the maximum excitation from 3579 mV to 3564 mV. 5.2 Calibrating a PRT The greatest source of error in a PRT is likely to be that the resistance at 0 °C deviates from the...
  • Page 20 R . The correct value of the multiplier, R , is the reciprocal of this reading. For example, if the initial reading is 0.9890, the correct multiplier is: = 1/0.9890 = 1.0111. 4WPB100, 4WPB1K PRT Bridge Terminal Input Modules...
  • Page 22 Campbell Scientific regional offices Australia France Thailand Location: Garbutt, QLD Australia Location: Vincennes, France Location: Bangkok, Thailand Phone: 61.7.4401.7700 Phone: 0033.0.1.56.45.15.20 Phone: 66.2.719.3399 Email: info@campbellsci.com.au Email: info@campbellsci.fr Email: info@campbellsci.asia Website: www.campbellsci.com.au Website: www.campbellsci.fr Website: www.campbellsci.asia Brazil Germany Location: São Paulo, SP Brazil...

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