Related Manuals for Campbell CURS100
Summary of Contents for Campbell CURS100
- Page 1 CURS100 100 Ohm Current Shunt Terminal Input Module Revision: 11/18 Copyright © 1996 – 2018 Campbell Scientific...
- 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...
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Page 9: Table Of Contents
Figures 1-1. CURS100 terminal input module ............1 2-1. CURS100 schematic ................2 3-1. CURS100 L terminal connected to a data logger G terminal using a jumper wire..................4 4-1. 2-wire with data logger power .............5 4-2. 2-wire with external power ..............5 4-3. -
Page 11: Introduction
CR300-series, and CR1000X dataloggers are able to do current measurements directly. While compatible with the CURS100, the CURS100 is not required to convert the current signal to a voltage. For more information, see CRBasic Editor Help for the CurrentSE() instruction. -
Page 12: Specifications
FIGURE 2-1. CURS100 schematic The CURS100 has three pins: high, low, and ground. These pins have the correct spacing to insert directly into the data logger high, low, and ground terminals (⏚ on CR6, CR300, CR800, CR850, CR1000, CR1000X, CR3000, CR5000, or CR9000(X)). -
Page 13: Differential Measurement
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 data logger signal ground (⏚). Hence, an additional connection must be made in order to... -
Page 14: Transmitter Wiring
G terminal (power ground) with a jumper wire (FIGURE 3-1). Connecting the L terminal to the adjacent ground (⏚ or G) terminal on the CURS100 can result in unwanted return currents on the data logger signal ground, which could induce... -
Page 15: 4.1.1 Possible Ground Loop Problems
CURS100 100 Ohm Current Shunt Terminal Input Module FIGURE 4-1. 2-wire with data logger power FIGURE 4-2. 2-wire with external power 4.1.1 Possible Ground Loop Problems The resistor must be grounded at the data logger to ensure that measurements are within common mode range. The signal (or low) output on the transmitter is higher than the data logger ground by the voltage drop across the resistor. -
Page 16: Three-Wire Transmitters
CURS100 100 Ohm Current Shunt Terminal Input Module transmitter and everything is fine. However, if the battery voltage drops to 11 volts, a 20-mA current will leave just 9 volts for the transmitter. In this case, when the battery drops below 11 volts, the output of the transmitter may be in error. -
Page 17: Four-Wire Transmitters
CURS100 100 Ohm Current Shunt Terminal Input Module FIGURE 4-5. 3-wire with external power Four-Wire Transmitters A four-wire transmitter 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 18: 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 transmitter. Examples showing the differential measurement made on Terminal 1 are then given for the CR1000X and CR9000(X) dataloggers;... -
Page 19: Cr1000X Program Example
CURS100 100 Ohm Current Shunt Terminal Input Module V = 2.0 V or 2000 mV Since the data logger 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 20: Cr9000(X) Program Example
CURS100 100 Ohm Current Shunt Terminal Input Module 'Main Program BeginProg 'Main Scan Scan(5,Sec,1,0) 'Default CR1000X Data Logger Battery Voltage measurement 'BattV' Battery(BattV) 'Default CR1000X Data ogger Wiring Panel Temperature measurement 'PTemp_C' PanelTemp(PTemp_C,60) 'Generic 4-20 mA Input measurement 'Measure' VoltDiff(Measure,1,mV2500,1,True,0,60,0.0625,-25) - Page 22 Campbell Scientific Worldwide Offices Australia Germany Location: Garbutt, QLD Australia Location: Bremen, Germany Email: Email: info@campbellsci.com.au info@campbellsci.de Website: www.campbellsci.com.au Website: www.campbellsci.de Brazil South Africa Location: São Paulo, SP Brazil Location: Stellenbosch, South Africa Email: andread@campbellsci.com.br Email: sales@csafrica.co.za Website: Website: www.campbellsci.com.br www.campbellscientific.co.za...