ACR Electronics OWL 100 Reference Manual Download Page 30

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OWL Data Loggers

produces an output of approximately 260 microamps full scale for each range available on the

current probe. Readings from the current probe are scaled into amperage units through

equations (in TrendReader software) that match the current probe and its range setting.

1.5.2

Setup and Use

The procedure for setting up the OWL Electric Current Data Logger is as follows:

Plug the current probe into the receptacle on the logger.

Adjust the range switch on the current probe to suit your application. A good way to verify

a conductor's maximum range is to check the circuit breaker or fuse rating. Then set the

range on your current probe to suit. Since the probes do not give predictable readings

below 10% in any range, always choose the lowest range possible to encompass the full

range of data you want to record.

Run TrendReader Software and choose the equation number that matches the probe

being used - Refer to Table 3-2. Then select the range corresponding to the logger's

switch setting. Note the software shows the highest possible reading which allows for a

small amount of overshoot. Therefore, if the switch setting is 5 on an A60FL/A65FL then

choose the 5.438 A range in software.

Refer to the

OWL Software driver

for other options.

WARNING: DO NOT CHANGE RANGE SWITCH WITHOUT ALSO SETTING LOGGER

Table 3-2 Current Probe Ranges

A60FL / A65FL

Equation 206

A70FL / A75FL

Equation 207

Range

Switch

Full Scale

Switch

Full Scale

5.438 A

10.88 A

27.19 A

54.38 A

100

108.8 A

250

271.9 A

250

271.9 A

500

543.8 A

Precautions

DANGER: High voltage may be present!

Do not clamp a current probe around a

conductor without the logger connected to it. This avoids sparking and prevents the

connectors from prematurely deteriorating.

The OWL Electric Current logger can only be used with current probes from ACR

Systems (altered Amprobe Instruments models A60FL, A70FL, A65FL and A75FL).

These probes provide low voltage DC current in proportion to the signal being measured.

They have a convenient snap connector added to protect against harsh environments.

DO NOT use any other probe unless approved by ACR in writing.

The OWL Electric Current logger can record current in accordance with the ranges

Summary of Contents for OWL 100

Page 1: ...Copyright 2010 ACR Systems Inc All Rights Reserved Reference Guide IMPORTANT OWL Data Loggers Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com ...

Page 2: ...he author make no claim to these trademarks For more information regarding trademarks see the Trademark Notices section of this manual ACR Systems Inc assumes no responsibility for errors or omissions or for damages resulting from the use of information contained in this document or from the use of programs and source code that may accompany it In no event shall the publisher and the author be lia...

Page 3: ...TrendReader is a Registered Trademark of ACR Systems Inc TRADEMARK NOTICES ...

Page 4: ......

Page 5: ...Logger Status 10 Logger Sampling 11 Fast Sampling 12 Logger Memory 14 Logger Triggering 16 3 OWL Temperature Data Logger Internal Sensor 16 Description 16 Setup and Use 17 Specifications 17 Applications 18 4 OWL Temperature Data Logger External Sensor 18 Description 18 Setup and Use 19 Specifications 21 Applications 22 5 OWL Electric Current Data Logger 22 Description 23 Setup and Use 24 Current P...

Page 6: ...cers 30 Applications 31 7 OWL 20 mA Data Logger 31 Description 31 Setup and Use 32 Choosing Transmitters 33 Specifications 33 Applications 35 8 APPENDIX A Temperature Ranges 35 Temperature Ranges 44 9 APPENDIX B Sample Rates 44 How a Data Logger Stores Readings 44 Sample Rate Table Index 46 ...

Page 7: ...d frequently refers to TrendReader Standard conventions and procedures To get the most from your logger please take time to familiarize yourself with TrendReader Standard and its Reference Guide For important information on how JR 1000 data loggers work and how to use them read the Introduction to JR 1000 chapter It will give you an overview of how the loggers work and how to configure them for yo...

Page 8: ...liably record up to 10 years of time based data for later analysis using TrendReader software on your computer 1 1 1 Features The OWL logger features optical data transfer optical flashing alarm selective measurement ranges holds over 32 000 readings Polyurethane water tight case Noryl Plastic water tight snap case water tight connector for external inputs typical 10 year battery life on board ser...

Page 9: ...ned until the sampling interval is over When you backup a logger s data onto your computer the correct time and date are referenced to each reading All readings are then individually time and date stamped and processed by an equation associated with the data logger channel The result is a collection of accurate time based data ready for detailed graphing and analysis 1 1 4 How to use OWL Data Logg...

Page 10: ...efore sending your logger out into the field to collect data clear the logger s memory This will help keep the collected files smaller as well as decrease the time needed to backup the logger later Note that clearing your OWL s memory is automatic if you make setup changes for example assign different equations change sample rates etc Test You can directly read the values that your OWL data logger...

Page 11: ... information If you are retrieving the logger from the field bring it back immediately to your computer for analysis In order to analyze your OWL logger s data you must first transfer a backup copy of its data to your computer To do this see Backup in the TrendReader guide After transferring your information to the computer the data is automatically copied to disk and time and date stamped You can...

Page 12: ...pursuant to Part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this eq...

Page 13: ... equation and Realtime value and range You can control the level of detail that you see for the settings by clicking on the and buttons at the left side to expand and collapse the nodes When you want to clear the logger s memory and start a new logging session with new parameters select Edit Setup from TrendReader In the Edit Logger Setup window make any necessary changes To implement your changes...

Page 14: ... for the channel The equation is selected in the Setup window but is not shown in the Status window To set the description click on the Description field and enter the name The logger collects and stores raw data readings An equation is used to transform the raw data into measurement units such as C with the current reading shown as a Realtime value You can use built in equations or you can create...

Page 15: ...sing the Lines Tab in Graph Settings For OWL 100 and 200 loggers you can set a range for the readings thereby allowing you to increase the resolution of the readings To set the range click on either the MidPoint or Range field Next click on the small button that appears at the right This will pop up a form allowing you to select the midpoint and range by simply dragging the bar For OWL 300 and 400...

Page 16: ...rs if the input value exceeds the range the maximum range value will be recorded To find out more about ranges available for temperature loggers see Appendix A Temperature Ranges 1 2 1 1 Channel Calibration The Calibration subsection shows the Low and Mid calibration values These values are used to adjust the readings of the logger in order to make the output more accurate To set each calibration ...

Page 17: ...ng set the start time accordingly The Status subsections are Sampling Memory and Triggering 1 2 2 1 Logger Sampling The sample rate is the frequency with which a logger takes readings The Sampling subsection indicates if the data logger is performing in a regular or fast sampling mode and what the sample rate is In normal sampling the rates available are from once every 8 seconds to once every 12 ...

Page 18: ...With the fast sampling mode you can select sample rates from 0 2 seconds 5 readings per second to 10 seconds The only memory mode available is Stop When Full To set the logger for fast sampling click on the Mode field and select Fast Next click on the desired time unit and select the value from the drop down list Note that in fast sampling mode the logger will stop recording when you communicate w...

Page 19: ...n the memory limit is reached the logger stops recording The length of time for data capture of the logger is determined by the sampling rate To find out more about how the capacity is affected by the sample rate see Appendix B Sample Rates Usage To set how the logger stores its data click on the Usage field and select FIFO or Stop When Full Start Time To set when the logger will start recording c...

Page 20: ...38 minutes ahead Note that the logger will begin to record based on the Trigger and Flash settings once the Start Time has been reached Size If you do not want to use the entire memory to store readings click on the Size field and enter the new size The End Time will adjust automatically ...

Page 21: ... field Next click on the small button that appears at the right This will pop up a form where you can drag the slider bars to set the appropriate trigger level Flash Type The Flash selection shown only in the Edit Setup window indicates under which conditions the logger s light will flash and when logging will start The light flashes every 8 seconds and the Flash function is not available in fast ...

Page 22: ...at if the Start Time has been set to a delay that starts after the trigger limit has been crossed the logger will not start to log until the Start Time is reached Once the Start Time has been reached the logger will record based upon the Trigger and Flash settings as noted above ...

Page 23: ... 40 to 70 C 40 to 158 F 1 3 2 Setup and Use TrendReader allows you to select the size of a range and a midpoint for the range Choosing the size of range allows you to control the resolution a smaller range results in a higher resolution for the readings Choosing the midpoint allows you to control where the highest resolution will occur readings closest to the midpoint of a temperature range are hi...

Page 24: ...ºF 77ºF Better than 1 0ºC 1 8ºF between 25 and 70ºC 13 and 158ºF Better than 2 0ºC 3 6ºF between 40 and 25ºC 40 and 13ºF Specifications are subject to change without notice The accuracy and resolution can be increased by using the narrow range feature 1 3 4 Applications testing and balancing HVAC systems monitoring temperature of perishable goods checking and settling tenant complaints providing e...

Page 25: ...robes 1 4 1 Description The External Sensor Temperature Logger uses a thermistor type probe to record changes in temperature The models available are Table 2 1 External Temperature Models Model Probe Range OWL 200 Supplied with 2m 6ft PVC cable OWL 200 ET 004 Low Temperature 60 to 55ºC 75 to 130ºF OWL 200 ET 016 General Temperature 35 to 95ºC 30 to 200ºF OWL 200 ET 081 High Temperature 10 to 170ºC...

Page 26: ...on NTC thermistor and cable potted into the end of a 25mm 1 long by 5mm 3 16 diameter cylindrical stainless steel tip R25 Value 10 k ohms Range 35 to 95 C 30 to 200 F Max Temp 150 C 300 F Accuracy 0 2 C 0 36 F between 0 to 70 C 32 to 158 F 1 0 C 1 8 F between 40 to 150 C 40 to 302 F Resolution 0 5ºC 25ºC 0 9ºF 77ºF Better than 1 0ºC 1 8ºF between 25 and 70ºC 13 and 158ºF Better than 2 0ºC 3 6ºF be...

Page 27: ...ed into the end of a 25mm 1 long by 5mm 3 16 diameter cylindrical stainless steel tip R25 Value 100k ohms Range 10 to 170 C 50 to 335 F Max Temp 190 C 375 F Accuracy 0 5 C 0 9 F between 75 to 175 C 135 to 347 F Resolution 0 5ºC 85ºC 0 9ºF 185ºF Better than 1 0ºC 1 8ºF between 25 and 140ºC 77 and 284ºF Better than 2 0ºC 3 6ºF between 140 and 170ºC 284 and 338ºF Cable 8m 26ft standard length with tw...

Page 28: ...00 and 250ºC 392 and 482ºF Cable 8m 26ft standard length with twisted pair moisture proof Teflon coated glass yarn water resistant chemical resistant splice PVC jacket to IP67 connector Equation 203 The resolution can be increased by using the narrow range feature 1 4 4 Applications testing and balancing HVAC systems monitoring transportation and storage temperatures providing data for energy mana...

Page 29: ...t probe to measure and record alternating current The following models are available Table 3 1 Electric Current Models Model Probe Range Eqn OWL 300 none must have modified probe OWL 300 A60FL 60 Hz 5 25 100 250 Amps 206 OWL 300 A65FL 50 Hz 5 25 100 250 Amps 206 OWL 300 A70FL 60 Hz 10 50 250 500 Amps 207 OWL 300 A75FL 50 Hz 10 50 250 500 Amps 207 How It Works The OWL Data Logger measures electric ...

Page 30: ...logger s switch setting Note the software shows the highest possible reading which allows for a small amount of overshoot Therefore if the switch setting is 5 on an A60FL A65FL then choose the 5 438 A range in software 4 Refer to the OWL Software driver for other options WARNING DO NOT CHANGE RANGE SWITCH WITHOUT ALSO SETTING LOGGER Table 3 2 Current Probe Ranges A60FL A65FL Equation 206 A70FL A75...

Page 31: ...lectrical panels or junction boxes For European applications Amprobe s model A47CL is available with screw in European round prongs two extra British type prongs and British fuse plug adapter Contact your local ACR representative for pricing and delivery of this product High Currents You can monitor current ranges higher than those available on a standard probe by using it with an additional trans...

Page 32: ...ettings If your equation numbers are correctly assigned and you are still getting incorrect readings it may be because you are measuring currents below 10 of the range To correct this make sure the range setting on the probe is at the lowest possible range that will encompass the readings you are interested in For example do not use the 250 amp range for recording currents below 25 amps Use the 25...

Page 33: ...a precision 2 5V reference voltage to convert the analog signal to a digital value A set of voltage divider resistors on the front end before the analog to digital conversion allows for 16 different input ranges The voltage reference has its own 20 1 resistor divider network making a set of low ranges This doubles the number of selectable ranges to 32 in total The digital values are then processed...

Page 34: ...st resolution 4 Refer to the OWL Software driver for other options Figure 4 1 DC Voltage Wiring Table 4 1 DC Voltage Ranges Range Full Scale Range Full Scale 0 121 0 mVDC 16 2 431 VDC 1 241 9 mVDC 17 4 863 VDC 2 362 9 mVDC 18 7 294 VDC 3 483 9 mVDC 19 9 73 VDC 4 605 8 mVDC 20 12 18 VDC 5 726 8 mVDC 21 14 61 VDC 6 848 mVDC 22 17 04 VDC 7 969 mVDC 23 19 47 VDC 8 1 093 VDC 24 21 96 VDC 9 1 214 VDC 25...

Page 35: ... measuring such variables as temperature relative humidity pressure speed pH and more You can obtain these from a wide variety of manufacturers or distributors An extensive listing of sensors and companies is published yearly by Sensors Magazine To figure out what to look for when choosing transducers it is helpful to know a few technical terms and how they relate to use with your OWL data logger ...

Page 36: ... for the transducer you intend to use to ensure the OWL s input impedance is acceptable Three Wire Transducers Three wire transducers have three connections a supply excitation voltage input V IN an output voltage SIG and a common COM A three wire transducer can be identified by reviewing the wiring diagram and looking for a single common connection These types of transducers are the most popular ...

Page 37: ...nnection Output The specified output of a transducer will determine whether it is compatible for use with the OWL DC Voltage logger The input range selection makes the logger directly compatible with almost any DC Voltage transducer output 1 6 4 Applications monitoring transducer outputs checking process controller signals providing laboratory data determining random event times recording speed ...

Page 38: ... available is the OWL 500 How it Works Current flow through a loop is logged by measuring the voltage drop across an internal 100 ohm input resistor This voltage drop is accurately gauged by comparing it to a highly stable voltage reference before conversion to a digital value by the A D converter The digital values are then processed into engineering units by an equation in TrendReader software 1...

Page 39: ...ow a few technical terms and how they relate to use with your OWL data logger Maximum Impedance An important consideration when choosing transducers is the requirement for loop impedance This simply refers to how much resistance the instrumentation for example the OWL logger can have before it will begin to cause problems For current loop inputs it is advantageous to have a very low impedance the ...

Page 40: ...rent logger The most popular transmitter output is 4 20mA which can be used with the 0 to 24mA input on the OWL 1 7 4 Specifications Current Input Ranges 0 to 24 mA Max Voltage 7 VDC Accuracy 1 full scale Resolution 0 5 8 bits Input Impedance 100 ohm Cable 2m 6ft length with PVC jacket to IP67 connector Equation 205 1 7 5 Applications obtaining environmental data using transmitters such as 1 condu...

Page 41: ...OWL Data Logger 34 Copyright 2010 ACR Systems Inc All Rights Reserved checking fluid level analyzing pneumatic and hydraulic pressures monitoring flow meters testing process control loops ...

Page 42: ... between 36 3 C 33 4 F and 57 9 C 136 2 F The tighter the range the better the resolution For example if room temperatures are to be measured then a range large enough to account for the biggest fluctuation is picked This might be 20 33 8 72 C 68 60 15 69 F in a warm climate This is among the smallest of ranges so the resolution is going to be better than 0 05 C 0 09 F 20 3 C 68 6 F 0 10 C 0 18 F ...

Page 51: ...ute interval the logger calculates the average of the fifteen readings and stores that average in its memory 1 9 2 Sample Rate Table The following table lists the maximum time spans over which your OWL Logger will record readings The time spans depend on the length of the sample rate An OWL Logger has a memory capacity of 32 767 readings In the table the Sample Rate column lists the available samp...

Page 53: ...8 L Logger 1 O OWL Approvals 1 Calibration 6 Channel 7 Channels 6 Data Logger 1 Description 1 Fast 6 Fast Sampling 11 Features 1 Flash 14 Introduction 1 Logger 1 Memory 6 12 Operation 1 Readings 1 Sampling 6 10 Setup 6 Software 6 Specifications 1 Status 6 10 Trigger 14 Triggering 6 Unknown Equation 7 OWL 100 16 OWL 200 18 OWL 300 22 OWL 400 26 OWL 500 31 P Process Signal Applications 31 Transducer...

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