Campbell Scientific CS10-L, CS15-L User Manual

CS10-L and CS15-L

Current Transformers

Revision: 3/12

Copyright © 2001-2012

Campbell Scientific, Inc.

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CS10-L and CS15-L 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 Description.....................................................1

2. Specifications ..............................................................1

3. Installation....................................................................2

4. Wiring............................................................................3

5. Programming ...............................................................3

5.1 CR800, CR850, CR1000, or CR3000 Programming................................3

5.2 CR200(X)-series Dataloggers...................................................................4

5.3 CR510, CR10X, CR23X Dataloggers ......................................................6

5.4 21X, CR7 Dataloggers..............................................................................8

5.5 CR1000 with Multiplexer Sample Program ...........................................10

5.6 CR10X with Multiplexer Sample Program.............................................11

Appendix

A. Theory of Operation................................................ A-1

A.1 Typical Electrical Circuit.................................................................... A-1

A.2 Current Transformer Description........................................................ A-3

A.3 Converting a Milliamp Signal to a Millivolt Signal............................ A-4

A.4 Multiplier ............................................................................................ A-5

A.5 CS10/CS15 Comparison..................................................................... A-5

Figures

1. CS10-L Current Transformer .....................................................................1

2. AC load wire installed in CS10 (color of ac load wire can vary) ...............2

3. Graph of a CS15 waveform ........................................................................5

4. Graph of CS10 waveform using burst mode ..............................................7

5. Graph of a CS10 waveform using 90 samples of amperage.......................8

A-1. Generator schematic .......................................................................... A-1

A-2. Schematic of generator with current transformer .............................. A-2

A-3. Schematic of current transformer with the wire ................................ A-2

A-4. CS10 with the wire ............................................................................ A-3

A-5. Magnetic flux schematic.................................................................... A-3

A-6. Windings schematic........................................................................... A-4

A-7. CS10 schematic ................................................................................. A-5

A-8. Adding 1250 mV creates positive output .......................................... A-6

A-9. CS15 schematic ................................................................................. A-6

A-10. CS15 measurement range................................................................ A-7

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CS10-L and CS15-L Current Transformers

1. General Description

Campbell Scientific’s CS10 and CS15 detect and measure the ac current along
an electrical wire using the magnetic field that is generated by that current.
The CS10 or the CS15 do not have direct electrical connection to the system.
These sensors output a millivolt signal allowing them to be directly connected
to our dataloggers.

The CS10 is compatible with our CR800, CR850, CR1000, CR3000, CR510,
CR10(X), and CR23X dataloggers. It uses CR Magnetic’s CR8459 Current
Transducer to measure the approximate current over a range of 0 to 200 A.
The CS15 was developed specifically for our CR200(X)-series dataloggers. It
is a modified version of the CS10 that measures the approximate current over
the range of 0 to 125 A. Both sensors are recommended for measurements that
do not require high accuracy.

FIGURE 1. CS10-L Current Transformer

2. Specifications

Example Applications:

• Motor or generator load conditions

• Efficiency studies

• Intermittent fault detection

• Rough submetering

1

CS10-L and CS15-L Current Transformers

Specifications

Measurement Ranges: 0.15 to 200 A (CS10)

0.15 to 125 A (CS15)

Frequency: 50 and 60 Hz
Insulation Resistance: 100 M ohm @ 500 VDC
High Potential: 2000 volts
Rated Current: 200 A (CS10), 125 A (CS15)
Storage Temperature: -25ºC to 70ºC
Operating Temperature: -25ºC to 55ºC
Case Material: Polypropylene Resin
Construction: Epoxy Encapsulated
Accuracy with 10 ohm

burden max. (resistive): typically ±5 percent of actual value with

provided multiplier
Dimensions: Outer diameter: 1.89” (4.8 cm)
Inner diameter: 0.75” (1.9 cm)
Height: 0.67” (1.7 cm)

3. Installation

Place one AC load wire through the hole of the CS10-L or CS15-L (see Figure

2).

2

FIGURE 2. AC load wire installed in CS10 (color of ac load wire can

vary)

4. Wiring

CS10-L and CS15-L Current Transformers

The CS10-L and CS15-L use a single-ended analog channel as follows.

5. Programming

NOTE

CS10-L

White Single-Ended Channel Red EX

Black AG or White SE

Shield AG or Black

Shield

SCWIN users: This manual was written primarily for those
whose needs are not met by SCWin. Your procedure is much
simpler: just add the CS10-L or CS15 (in the Miscellaneous
Sensors folder), save your program, and follow the wiring shown
in Step 2 of SCWin.

The datalogger is programmed using either CRBasic or Edlog. Dataloggers
that use CRBasic include our CR200(X)-series, CR800, CR850, CR1000, and
CR3000. Dataloggers that use Edlog include our CR510, CR10(X), and
CR23X. In CRBasic, the VoltSE instruction is used to measure the sensor. In
Edlog, a P1 instruction is used.

CS15-L

In order to monitor the amperage of an alternating current circuit, the program
must take many samples from the CS10-L or CS15-L sensor to capture the
waveform over a specified time, and then calculate the average energy under
the curve. There are many methods to do this, depending on the datalogger,
the untapped programming capacity, and other factors.

5.1 CR800, CR850, CR1000, or CR3000 Programming

With these dataloggers, the best method for monitoring amperage is to make
millivolt burst measurements, and then calculate RMS. The millivolt burst
measurements are made by using the VoltSE instruction with multiple reps on
the same channel (i.e., negative value for channel number). The SpaDevSpa
instruction calculates RMS.

NOTE

Program must be run in the pipeline mode.

It is important to get complete cycles. If you make 100 measurements during a

0.1 second time period, you’ll get five complete cycles for a 50 Hz waveform
or six complete cycles for a 60 Hz waveform.

3