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Summary of Contents for Campbell CURS100
- Page 1 CURS100 100 Ohm Current Shunt Terminal Input Module Revision: 2/13 C o p y r i g h t © 1 9 9 6 - 2 0 1 3 C a m p b e l l S c i e n t i f i c ,...
- Page 3 Campbell pricelist or product manual. Products not manufactured, but that are re-sold by Campbell, are warranted only to the limits extended by the original manufacturer. Batteries, fine-wire thermocouples, desiccant, and other consumables have no warranty.
- Page 4 SCIENTIFIC, INC., phone (435) 227-9000. After an applications 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.
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Page 5: Table Of Contents
CR23X Program Example..............10 Figures 1-1. CURS100 terminal input module ............1 2-1. CURS100 schematic ................2 3-1. CURS100 L terminal connected to a datalogger G terminal using a jumper wire..................4 4-1. 2-wire with datalogger power ..............5 4-2. 2-wire with external power ..............5 4-3. -
Page 7: Introduction
Terminal input modules connect directly to the datalogger's input terminals to provide completion resistors for resistive bridge measurements, voltage dividers, and precision current shunts. The CURS100 converts a current signal (for example, 4 to 20 mA) to a voltage that is measured by the datalogger. The 100 ohm resistor used for the current shunt allows currents up to 25 mA to be read on a ±2500 mV range (CR10, CR10X) and currents up to 50 mA to be... -
Page 8: Measurement Concepts
AG FIGURE 2-1. CURS100 schematic The CURS100 has three pins: high, low, and ground; these pins are the correct spacing to insert directly into the datalogger's high, low, and ground terminals on 21X, CR23X, CR800, CR850, CR1000, CR3000, CR5000, or CR9000(X) or AG on CR10(X)). -
Page 9: Differential Measurement
CURS100 connects the resistor between the high and the low terminals. Completing the Current Loop Circuit As shown in FIGURE 2-1, the 100 Ω sense resistor in the CURS100 is not connected to the adjacent ground pin that connects into the datalogger signal ground ( or AG). -
Page 10: Transducer Wiring
G) terminal on the CURS100 can result in unwanted return currents on the datalogger signal ground, which could induce undesirable offset errors in low-level, single-ended measurements. The G terminal on the CURS100 can be used to connect cable shields to ground. Transducer Wiring Current transducers differ mainly in how they are powered and in the relative isolation of the current output. -
Page 11: 4.1.1 Possible Ground Loop Problems
CURS100 100 Ohm Current Shunt Terminal Input Module Datalogger Transducer Signal Power +12 V FIGURE 4-1. 2-wire with datalogger power Datalogger Transducer Signal Power – Battery FIGURE 4-2. 2-wire with external power 4.1.1 Possible Ground Loop Problems The resistor must be grounded at the datalogger to ensure that measurements are within common mode range. -
Page 12: Three-Wire Transducers
CURS100 100 Ohm Current Shunt Terminal Input Module transducer and everything is fine. However, if the battery voltage drops to 11 volts, a 20 mA current will leave just 9 volts for the transducer. In this case, when the battery drops below 11 volts, the output of the transducer may be in error. -
Page 13: Four-Wire Transducers
CURS100 100 Ohm Current Shunt Terminal Input Module Datalogger Transducer Signal Ground Power – Battery FIGURE 4-5. 3-wire with external power Four-Wire Transducers A four-wire transducer has separate wires for power input and ground and for signal output and ground. The signal ground may or may not be internally tied to the power ground. -
Page 14: Sensor And Programming Example
CURS100 100 Ohm Current Shunt Terminal Input Module Sensor and Programming Example In this example, the input voltage range, and the multiplier and offset values are calculated for a 4 to 20 mA output pressure transducer. Examples showing the differential measurement made on Channel 1 are then given for the CR1000, CR9000(X), CR10(X), and 21X dataloggers;... -
Page 15: Cr1000 Program Example
CURS100 100 Ohm Current Shunt Terminal Input Module and at 700 psi is: V = 0.020 × 100 V = 2.0 V or 2000 mV Since the datalogger measures in mV, the multiplier (or slope) must be in units of psi/mV. Therefore, the y values have the units psi and the x values mV. -
Page 16: Cr9000(X) Program Example
CURS100 100 Ohm Current Shunt Terminal Input Module BeginProg Scan (1,Sec,1,0) 'Generic 4-20 mA Input measurement Measure: VoltDiff (Measure,1,mV2500,1,True,0,_60Hz,0.0625,-25.0) CallTable (Hourly) NextScan EndProg CR9000(X) Program Example VoltDiff(Press_psi, 1, mV5000, 5, 1, 1, 0, 0, 0.3125, 75) CR10(X) Program Example 1: Volt (Diff) (P2) Reps ±... - Page 18 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com • info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za • cleroux@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)
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