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CURS100

100 Ohm Current Shunt

Terminal Input Module

Revision: 11/18

Copyright © 1996 – 2018

Campbell Scientific

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Summary of Contents for CURS100

Page 1: ...CURS100 100 Ohm Current Shunt Terminal Input Module Revision 11 18 Copyright 1996 2018 Campbell Scientific ...

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Page 3: ...s under guarantee or not Please state the faults as clearly as possible and if the product is out of the guarantee period it should be accompanied by a purchase order 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 De...

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Page 5: ...s digital cell phones and aerials may also not be applicable according to your locality Some brackets shields and enclosure options including wiring are not sold as standard items in the European market in some cases alternatives are offered Details of the alternatives will be covered in separate manuals Part numbers prefixed with a symbol are special order parts for use with non EU variants or fo...

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Page 7: ...e beginning work Wear a hardhat and eye protection and take other appropriate safety precautions while working on or around tripods and towers Do not climb tripods or towers at any time and prohibit climbing by other persons Take reasonable precautions to secure tripod and tower sites from trespassers Use only manufacturer recommended parts materials and tools Utility and Electrical You can be kil...

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Page 9: ...s 7 5 Sensor and Programming Example 8 5 1 Voltage Range 8 5 2 Calculating Multiplier and Offset An Example 8 5 3 CR1000X Program Example 9 5 4 CR9000 X Program Example 10 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 Volt...

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Page 11: ...resistor used for the current shunt allows currents up to 50 mA to be read on a 5000 mV range CR6 CR800 CR850 CR1000 CR1000X CR3000 CR5000 CR9000X CR9000 The CR300 allows currents up to 25 mA with a 100 to 2500 mV range The CR6 serial numbers greater than or equal to 7502 CR300 series and CR1000X dataloggers are able to do current measurements directly While compatible with the CURS100 the CURS100...

Page 12: ...ted with the sensor and a power supply The power supply provides the required power to the sensor and the transmitter The sensor signal changes with the phenomenon being measured The current transmitter converts the sensor signal into a current signal This current signal changes in a known way with the phenomenon being measured An advantage of current loop transmitters over voltage output transmit...

Page 13: ...to a data logger G power ground terminal with a jumper wire FIGURE 3 1 Connecting the L terminal to the adjacent ground or G terminal on the CURS100 will result in unwanted return currents flowing into the data logger signal ground which could induce undesirable offset errors in low level single ended measurements The ground or G terminal on the CURS100 can be used to connect cable shields to grou...

Page 14: ...ndesirable offset errors in low level single ended measurements The G terminal on the CURS100 can be used to connect cable shields to ground 4 Transmitter Wiring Current transmitters differ mainly in how they are powered and in the relative isolation of the current output This section groups the transmitters by the total number of wires the transmitter uses to obtain power and output the current 4...

Page 15: ...established through earth ground to the data logger earth ground This path is in parallel with the path from the signal output through the resistor hence not all the current will pass through the resistor and the measured voltage will be too low 4 1 2 Minimum Supply Voltage When the power supply is in the current loop as is the case in a 2 wire transmitter it is necessary to consider the effect of...

Page 16: ...er C is directly related to the voltage available from the battery A FIGURE 4 3 Voltage drop in a 2 wire transducer with external power 4 2 Three Wire Transmitters A three wire current loop transmitter has the power supply connected directly to the transmitter The voltage of the power supply is the voltage applied to the transmitter The current output returns to power ground Data logger ground is ...

Page 17: ...mitters 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 Some transmitters have completely isolated outputs FIGURE 4 6 4 wire with data logger power FIGURE 4 7 4 wire with external power ...

Page 18: ...t I V 100 I The maximum voltage occurs at the maximum current Thus a 4 to 20 mA transmitter will output its maximum voltage at 20 mA V 100 ohms 0 02 A 2 V An output of 2 volts is measured on the 2500 mV range on the CR800 CR850 and CR1000 or on the 5000 mV range on the CR6 CR1000X CR3000 CR5000 or CR9000 X The 2 volt output is measured on the 100 to 2500 mV range of the CR300 5 2 Calculating Multi...

Page 19: ... for Sensor with 4 to 20 mA Output CR1000X Series CR1000X program example for sensor with 4 20 mA output Assuming a flow meter that outputs a 4 20mA signal representing 0 100 gal min the voltage across the resistor at 0 gal min 4mA 100 ohms 400mV and at 100 gal min is 20mA 100 ohms 2000mV The change in mV is 2000mV 400mV 1600mV for 0 100 gal min flow rate The measurement result X for the VoltDiff ...

Page 20: ...t Measure VoltDiff Measure 1 mV2500 1 True 0 60 0 0625 25 Call Data Tables and Store Data CallTable Hourly CallTable Daily NextScan 5 4 CR9000 X Program Example CRBasic Example 5 1 will work with the CR9000 X datalogger with one small change Insert the following VoltDiff command in place of the VoltDiff command in the program The program will now function with the CR9000 X This program assumes the...

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Page 22: ...t Asia Location Bangkok Thailand Email info campbellsci asia Website www campbellsci asia China Location Beijing P R China Email info campbellsci com cn Website www campbellsci com cn Spain Location Barcelona Spain Email info campbellsci es Website www campbellsci es Costa Rica Location San José Costa Rica Email info campbellsci cc Website www campbellsci cc UK Location Shepshed Loughborough UK Em...

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