ACR ACR Systems OWL-100-POLY Manual

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IMPORTANT!

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com

OWL Data Loggers

Reference Guide

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OWL Data Loggers

- graphic, electronic, or mechanical, including photocopying, recording, taping, or information storage and retrieval systems - without the written permission of ACR Systems Inc.

Products that are referred to in this document may be either trademarks and/or registered trademarks of the respective owners. The publisher and the 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 liable for any loss of profit or any other commercial damage caused or alleged to have been caused directly or indirectly by this document.

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TRADEMARK NOTICES

TrendReader is a Registered Trademark of ACR Systems Inc.

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Contents

Table of Contents

Section I OWL Data Logger 1

............................................................................................................................................ 11 Introduction to OWL Data Loggers

........................................................................................................................................................... 1Features

Description

How OWL Data Loggers Take Readings

Installation

General Specifications

............................................................................................................................................ 62 OWL Software Driver

Channel Calibration

Logger Sampling

Logger Memory

Logger Triggering

............................................................................................................................................ 16

OWL Temperature Data Logger (Internal Sensor)

Applications

........................................................................................................................................................... 1

........................................................................................................................................................... 2

........................................................................................................................................................... 2How to use OWL Data Loggers

........................................................................................................................................................... 3

........................................................................................................................................................... 4

........................................................................................................................................................... 5Approvals

........................................................................................................................................................... 7Logger Channel

................................................................................................................................................. 9

........................................................................................................................................................... 10Logger Status

................................................................................................................................................. 10

................................................................................................................................................. 11Fast Sampling

................................................................................................................................................. 12

................................................................................................................................................. 14

........................................................................................................................................................... 16Description

........................................................................................................................................................... 16Setup and Use

........................................................................................................................................................... 17Specifications

........................................................................................................................................................... 17

............................................................................................................................................ 18

OWL Temperature Data Logger (External Sensor)

........................................................................................................................................................... 18Description

Setup and Use

Specifications

........................................................................................................................................................... 18

........................................................................................................................................................... 19

........................................................................................................................................................... 21Applications

............................................................................................................................................ 225 OWL Electric Current Data Logger

........................................................................................................................................................... 22Description

Setup and Use

Current Probes and Accessories

Troubleshooting

Applications

........................................................................................................................................................... 23

........................................................................................................................................................... 24

........................................................................................................................................................... 24Specifications

........................................................................................................................................................... 25

............................................................................................................................................ 266 OWL DC Voltage Data Logger

........................................................................................................................................................... 26Description

........................................................................................................................................................... 26Setup and Use

Specifications

........................................................................................................................................................... 28

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OWL Data Loggers

Index

Choosing Transducers

................................................................................................................................................. 28

........................................................................................................................................................... 30Applications

............................................................................................................................................ 317 OWL 20 mA Data Logger

Description

Setup and Use

Specifications

Applications

........................................................................................................................................................... 31

........................................................................................................................................................... 32Choosing Transmitters

........................................................................................................................................................... 33

............................................................................................................................................ 358 APPENDIX A Temperature Ranges

........................................................................................................................................................... 35Temperature Ranges

............................................................................................................................................ 449 APPENDIX B Sample Rates

How a Data Logger Stores Readings

Sample Rate Table

........................................................................................................................................................... 44

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WELCOME

Congratulations on your purchase of a JR-1000 data logger. We are confident that you will find it to be a most valuable and useful tool for your data collection applications.

This Reference Guide is designed to be used hand-in-hand with TrendReader Standard software and 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 your application. Next, read the chapter that deals with JR-1000 logger you have.

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OWL Data Loggers

SECTION 1 OWL Data Logger

1.1

Introduction to OWL Data Loggers

OWLs are easy-to-use, battery-powered data loggers. Pocket-sized and rugged, they can be used in a wide range of environmental and industrial applications. There are a number of models available to directly measure and record variables such as temperature, electric current, analog voltage, and current loop. Each model can reliably 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 serial identification

· mounting magnet and locking hole

1.1.2 Description

OWL Data Loggers record readings continuously at a fixed sample interval. Using an optical data link, it transfers these readings to your computer for analysis with TrendReader software.

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Self-contained operation and its small size permit easy installation. The internal lithium battery typically lasts up to 10 years or at least 1,000 backups. Unique identification names stored in each logger allow for convenient tracking.

A 32,768 byte unlimited-write-cycle memory is used to store the measurements from an 8-bit (equivalent to 10-bit resolution on narrow ranges) analog-to-digital converter while a quartz crystal oscillator keeps track of time.

1.1.3 How OWL Data Loggers Take Readings

OWL Data Loggers can store 32,767 readings. Once the memory is full, the OWL can be setup to either bump the oldest reading to make room for the newest (sliding window of 32,767 readings) or stop recording.

You can set the frequency at which your logger takes readings through the software. At a sample rate of eight seconds, one reading is taken every eight seconds and saved to memory. As you slow the sample rate the logger begins to average readings before saving them to memory. To do this the logger takes a reading every eight seconds, but instead of transferring this directly to the logger's memory, it stores the reading in a buffer (a temporary memory) where it is retained 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.

OWL Data Logger

1.1.4 How to use OWL Data Loggers

Using your OWL Data Logger for most applications is a simple process. With proper planning, setup, installation and retrieval of your data logger, you can be assured that the information you collect will be both correct and useful. This section provides general procedures for using OWL Data Loggers. For additional and specific information on these steps, refer to the chapter in this manual that deals with the particular OWL model you have.

How to Communicate

In order to setup or get your logged data, you must interface the OWL with your computer using the LIC-101 Interface Cable. The LIC-101 can be either plugged into or pointed at the logger's optical port in order to send a setup or retrieve logged data.

Planning

Proper planning is the key to successful data logging. Time spent in this stage will help you save time and frustration later. To help you plan, answer these questions:

· What exactly do I want to measure?

· Where is the best place to measure?

· How long do I want to monitor for?

· Should other variables be monitored simultaneously?

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OWL Data Loggers

Setup

To setup your OWL data logger you must first have TrendReader Software installed and running on your computer. You can then configure your logger with various software setup options.

Set Sample Rate

Always confirm the sample rate (how often the logger takes readings) to make sure it will be acceptable for your application. You can alter the frequency at which your OWL Data Logger records readings by changing the sample rate. You can choose rates from between 8 seconds and 12 hours in 4 second increments. In Fast Read mode, you can select intervals between 0.2 and 10 seconds.

To help determine which sample rate you should choose, answer these questions:

· How long do I need to record data?

· How much time will elapse between when I retrieve the logger and download the data to

· How often do readings need to be taken?

Making External Connections

If you are using your OWL Data Logger to monitor external modules, sensors, or circuitry, make sure the connections are secure.

my computer (for example, the trip back to the office)?

Clear Memory

Before 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 is sensing using the Realtime capability of TrendReader software. This test gives you the opportunity to check your logger setup and make any necessary changes before starting the logging session.

Label

OWLs can be setup with a description that can be put into the logger's memory. It is recommended that you use this feature in order to know what each graph refers to.

1.1.5 Installation

Mounting

Use the magnetic backing to conveniently mount your logger on metal surfaces like ductwork or electrical control cabinets. If you're concerned about theft, lock your logger to a permanent fixture using the locking tab or take advantage of its small size and hide it completely out of view. Because OWL loggers are so light, you can use special mounting methods like Velcro® fasteners to secure them to almost any surface. Make sure your logger's mounting method will last the full length of your data logging session.

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OWL Data Logger

Do not rely on the logger's magnetic strip for adhesion if the mounting surface is uneven, unstable or above 65° C (150°F).

Keep Track

Make sure to keep a record of where you have placed each logger in a building or system plan. You will save time looking for them when your data gathering session is over. Also, keep track of when you placed the loggers in the area you are monitoring. This will help when producing graphs on your computer. It may be helpful to label (shipping tag) each logger so you can properly identify and differentiate it from other loggers.

Analysis

After sufficient time has passed for the logger to obtain a representative profile of data, it is time to analyze the 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 find a detailed description of all software functions in the TrendReader guide.

1.1.6 General Specifications

General

Size: 60 x 48 x 19mm (2.4" x 1.9" x 0.75")

Case Material: Polyurethane

Case Weight: 80g (2.8 oz.)

Snapcase Material: Noryl® Plastic

Snapcase Weight: 54g (1.9 oz.)

Operating Limits: -40 to 70°C. (-40 to 158°F.) and 0 to 95% RH

Clock Accuracy: +/-2 seconds/day

Battery: 3.6 Volt Lithium, 1 Amp-hour

Power Draw: 5 to 10 microamps (continuous)

Battery Life: Ten years projected

Alarm Type: Optical red LED

(non-condensing)

Memory and Data Inputs

Memory Size: 32,767 readings

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OWL Data Loggers

Readings: Continuous (first in, first out) or stop when full at

Resistance to X-rays: Tested for protection against a 160 kV 150 mA-sec. dose @

1.1.7 Approvals

For our U.S. Customers:

ACR's circuitry design has been tested and found to comply with the limits for Class A digital device, 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 equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his/her expense.

user-programmable intervals between 0.2 seconds and 12 hours.

38 in. F.F.D. (about 100 times that of an airport X-ray machine). Tested for protection against Gamma Ray (equivalent to 0.1337 - 1.38 mega volts) IR 192 - 28 curies @ 30 second exposure source to object distance 5".

For our Canadian Customers:

ACR's circuitry design does not exceed Class A limits for radio noise emissions as set out in Schedule V to VIII of the Radio Interference Regulations of Communications Canada.

Specifications are subject to change without notice.

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OWL Data Logger

1.2

OWL Software Driver

TrendReader software uses a software driver to communicate with OWL data loggers. The software driver takes the form of two windows. The Status window, shown when you contact the logger, is used to display the settings currently stored in the data logger. The Setup window, shown when you select Edit Setup, is used to alter the current settings and apply the changes to the data logger. The settings are divided into two main sections: Status and

Channel. Status contains information about sampling, memory and triggering. The channel of

the logger contains information about the description, 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, you can either click on Apply or OK. OK will implement the changes and close the window whereas Apply will leave the window open, thereby allowing you to make changes in other features.

When you backup a logger, a window pops up with a progress bar showing the time remaining. However, OWL loggers store data in a compressed format and the application does not know ahead of time how much data is stored. Therefore, the progress bar and time remaining displayed may not be accurate.

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OWL Data Loggers

1.2.1 Logger Channel

When you contact the logger, the logger status is displayed. The Channel line gives the description, the number of readings stored, the Realtime value, and the time of the next reading. The Realtime value is based on the equation that you select 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 your own custom equations. See Equations in the TrendReader guide for further information. To set the equation, click on the Equation

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OWL Data Logger

field and select the equation from the drop-down list. *

* Note that if a custom equation is not available when Edit Setup... is selected (e.g.: deleted) then the equation will be shown as unknown. If a new equation is not selected the Realtime value will not display correctly. If the logger is backed up the channel will be disabled then changes to the equation can be made in the graph using 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 loggers you can set the minimum and maximum values for the range for the readings. To set the range click on either the Range Min or Range Max fields. Next, click on the small button that appears at the right. This will pop up a form allowing you to

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OWL Data Loggers

select the maximum and minimum range values by simply dragging the bar.

The OWL 500 does not have an adjustable range but does display the default range settings for information.

For any of the loggers, 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 value, click on the appropriate calibration field and enter the value.

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1.2.2 Logger Status

When you contact the logger, the logger status is displayed. The Status line indicates whether the data logger is actively logging, waiting to start or dormant. If you set up the logger with no delay, it will immediately start logging and the status will show the number of readings, or samples, that have been taken. If you want to have the logger wait before it starts logging, set the start time accordingly. The Status subsections are Sampling, Memory, and Triggering.

OWL Data Logger

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 hours, while in fast sampling, the rates can be as quick as 5 times per second.

To set the logger for regular sampling, click on the Mode field and select Normal. To set the sample rate, click on the desired time unit and select the value from the drop-down list as

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OWL Data Loggers

shown.

1.2.2.1.1

To find out more about sample rates and to view a set of sample rate tables, see Appendix B

Sample Rates.

Fast Sampling

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 with it.

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1.2.2.2 Logger Memory

The Memory subsection indicates how the data is stored in memory and what the start and end times (or capacity) are for the data logging. In the FIFO (First In, First Out) mode, the logger continually stores data and when the memory limit is reached, the new readings start to overwrite the oldest readings. Using this method, the logger is always collecting data, but only saves the most recent data in its memory. In the Stop When Full mode, when the memory limit is reached, the logger stops recording.

OWL Data Logger

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 click on the Start Time field. Next, click on the small button that appears at the right. This will pop up a form allowing you to set the date and time. Highlight the date or time and enter the appropriate value. You can also click on the drop-down list arrow to bring up a calendar. You can set the logger's starting time for up to 6

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days, 1 hour, and 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.

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1.2.2.3 Logger Triggering

High & Low Triggers

Triggers are used to indicate when any reading has exceeded preset thresholds and begin logging once the limit has been crossed.

The Trigger Threshold values for the OWL Logger are based upon the Equation and limited by the Midpoint/Range selected. If you change the Range values the High and Low Trigger values will also change. The maximum High Trigger will not exceed the maximum Range value and the minimum Low Trigger will not be less than the minimum Range value.

* For the OWL, the High and Low Triggers enable you to set upper and lower limits inside which the OWL will not log depending on the Flash mode you select. The Alarm and Failsafe Alarm Flash modes will allow the logger to record within the trigger limits.

To set the High or Low Trigger, click on the trigger's 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.

OWL Data Logger

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 sample mode. The Flash modes available are:

· Off: the light will never flash.

· Until Tripped: the light will flash until the OWL starts logging.

· Until Full: the light will flash until the logger is full.

· While Logging: the light will flash while the logger is taking readings.

· Always: the light will always flash.

· Alarm: the light will blink after an event (note that the logger will log within the trigger

limits, but will only flash after exceeding the trigger).

· Failsafe Alarm: the light will flash before the event (note that the logger will log within

the trigger limits, but will flash when exceeding the trigger).

To set the Flash mode, click on the Type field and select the mode from the drop-down list.

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OWL Data Loggers

* Note that 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.

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OWL Data Logger

1.3

OWL Temperature Data Logger (Internal Sensor)

Features

The OWL Temperature Data Logger with the Internal Sensor offers temperature recording in a small, water-resistant enclosure. In addition to its rugged construction, the logger can be setup to record a wide range of temperatures, all configurable by a few, easy keystrokes.

1.3.1 Description

The Internal Sensor Temperature Logger uses an on-board thermistor to record changes in temperature. The model available is the OWL-100 which operates from -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 higher in resolution than those at each end of the range. See Appendix A Temperature Ranges for a list of the available ranges.

The steps required to configure the OWL Temperature Logger are as follows:

1. Run TrendReader Software and choose the Internal Sensor equation.

2. Select a range that best fits the expected data.

3. Refer to the OWL Software driver for other options.

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OWL Data Loggers

1.3.3 Specifications

Internal Temp. Logger

Sensor type: NTC thermistor 10kW @ 25ºC (77ºF)

Range: -40 to 70ºC (-40 to 158ºF)

Accuracy: ±0.5ºC @ 25ºC (±0.9ºF @ 77ºF)

Resolution: 0.5ºC @ 25ºC (0.9ºF @ 77ºF)

Specifications are subject to change without notice.

The accuracy and resolution can be increased by using the narrow range feature.

1.3.4 Applications

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)

· testing and balancing HVAC systems

· monitoring temperature of perishable goods

· checking and settling tenant complaints

· providing environmental data

· verifying food processes

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OWL Data Logger

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 (50 to 335ºF)

OWL-200

ET-086 Oven Temperature

70 to 255ºC (155 to 490ºF)

1.4

OWL Temperature Data Logger (External Sensor)

Features

The OWL Temperature Data Logger with the External Sensor offers temperature recording in a small, water-resistant enclosure. The connection between the temperature probe and the logger is water-resistant. There are four temperature probes available that can monitor a wide range of temperatures, and custom equations can be written to use other probes.

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

1.4.2 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

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OWL Data Loggers

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 higher in resolution than those at each end of the range. See Appendix A Temperature Ranges for a list of the available ranges.

The steps required to configure the OWL Temperature Logger are as follows:

1. Run TrendReader Software and choose the External Sensor equation corresponding to

the attached probe.

2. Select a range that best fits the expected data.

3. Refer to the OWL Software driver for other options.

1.4.3 Specifications

ET-016 General Purpose Probe

Description: NTC thermistor and cable potted into the end of a 25mm (1")

R25 Value: 10 k ohms

Range: -35 to 95°C (-30 to 200°F)

long by 5mm (3/16") diameter cylindrical stainless steel tip.

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) between -40 and -25ºC (-40 and

-13ºF)

Cable: 8m (26ft) standard length with Teflon® protective jacket,

water-resistant / chemical-resistant splice, PVC jacket to IP67 connector.

Equation: 200

The resolution can be increased by using the narrow range feature.

ET-004 Low Temperature Probe

Description: NTC thermistor and cable potted into the end of a 89mm (3½

") long tapered stainless steel penetration tip with 89mm (3½ ") long by 19mm (¾") diameter tapered plastic handle.

R25 Value: 2,252 ohms

Range: -60 to 55°C (-75 to 130°F)

Max Temp.: 150°C (300°F)

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OWL Data Logger

Accuracy: ±0.2°C (±0.36°F) between 0 to 70°C (32 to 158°F)

±1.0°C (±1.8°F) between -60 to 100°C (-76 to 212°F)

Resolution: 0.5ºC @ 0ºC (0.9ºF @ 32ºF)

Better than 1.0ºC (1.8ºF) between -50 and 40ºC (-58 and

104ºF)

Better than 2.0ºC (3.6ºF) between -65 and -50ºC (-85 and

-58ºF)

Cable: 5m (16ft) standard length with Teflon® protective jacket,

water-resistant / chemical-resistant splice, PVC jacket to IP67 connector.

Equation: 201

The resolution can be increased by using the narrow range feature.

ET-081 High Temperature Probe

Description: NTC thermistor and cable potted 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 twisted-pair Teflon® insulated

wire, water-resistant / chemical-resistant splice, PVC jacket to IP67 connector.

Equation: 202

The resolution can be increased by using the narrow range feature.

ET-086 Oven Temperature Probe

Description: NTC thermistor and cable potted into the end of a 25mm (1")

long by 5mm (3/16") diameter cylindrical stainless steel tip.

R125 Value: 26,266 ohms

Range: 70 to 255°C (155 to 490°F)

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OWL Data Loggers

Max Temp.: 275°C (525°F)

Accuracy: ±1°C (±1.8°F) between 120 to 260°C (248 to 500°F)

Resolution: 0.6ºC @ 150ºC (1.1ºF @ 302ºF)

Cable: 8m (26ft) standard length with twisted-pair moisture-proof

Equation: 203

The resolution can be increased by using the narrow range feature.

1.4.4 Applications

· testing and balancing HVAC systems

Better than 1.0ºC (1.8ºF) between 100 and 200ºC (212 and

392ºF)

Better than 2.0ºC (3.6ºF) between 200 and 250ºC (392 and

482ºF)

Teflon® coated glass yarn, water-resistant / chemical-resistant splice, PVC jacket to IP67 connector.

· monitoring transportation and storage temperatures

· providing data for energy management studies

· optimizing hot water temperatures

· testing ovens and freezers

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OWL Data Logger

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

1.5

OWL Electric Current Data Logger

Features

The OWL Electric Current Data Logger is a versatile equipment performance logger. It is useful for recording a single phase of alternating current without having to interrupt circuitry under test. It offers added protection against high voltage spikes, such as lightning, with optical isolation between logger and computer.

1.5.1 Description

The Electric Current Logger uses an external clamp-on-current probe to measure and record alternating current. The following models are available:

Table 3-1 Electric Current Models

How It Works

The OWL Data Logger measures electric current through an external current probe. The probe is a transformer with its internal coil serving as the secondary winding and the current-carrying conductor being measured serving as the primary winding. The output of the probe (which is the input to the logger) is conditioned through internal circuitry. The probe

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A60FL / A65FL

Equation 206

A70FL / A75FL

Equation 207

Range

Switch

Full Scale

Switch

Full Scale

055.438 A

10.88 A

12527.19 A

54.38 A

100

108.8 A

250

271.9 A

250

271.9 A

500

543.8 A

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:

1. Plug the current probe into the receptacle on the logger.

2. 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.

3. 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.

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

Precautions

1. 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.

2. 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.

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

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available on the A60FL, A65FL, A70FL and A75FL probes. Always make sure the

A60FL / A65FL

Equation 206

A70FL / A75FL

Equation 207

Switch

Range

Switch

Range

0.5 to 5 A

1 to 10 A

2.5 to 25 A

5 to 50 A

current you will be recording will fall into the appropriate range you set on the current probe.

1.5.3 Current Probes and Accessories

OWL Electric Current loggers come with a choice of current probes modified to plug into the logger with no tools. These clamps can be used with a number of accessories to fit most typical applications.

Low Currents

To log very low currents (such as monitoring the operation of electrical appliances), the probe can be used with a Line Splitter. The Amprobe A47L Energizer multiplies the signal to the logger by ten times over a range of 0.1 to 15A. It also allows effective splitting of a two-line conductor, allowing measurements without the need to enter electrical 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.

OWL Data Logger

High Currents

You can monitor current ranges higher than those available on a standard probe by using it with an additional transformer. For this purpose Amprobe Instruments has available their Amptran® CT50-2 a 50 to 1 transformer (to monitor currents up to 3000 amps). Contact your ACR representative for availability on these probes.

1.5.4 Specifications

Current Probes

Output Current: 260 µA full scale into 400 ohms.

Cable: 2m (6ft.) length with PVC jacket to IP67 connector.

Accuracy: ±4.0% of full scale above 10% of range

Ranges: The following table lists the usable range available for each

setting.

Table 3-3. Current Probe Usable Ranges

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100

10 to 100 A

250

25 to 250 A

250

25 to 250 A

500

50 to 500 A

OWL Data Loggers

1.5.5 Troubleshooting

The OWL Electric Current logger seems to give wrong readings. What's wrong?

· If the graphs seem incorrect, check the equation number assigned to the graph file.

This equation number must correspond to the model number of the current probe used. Refer to Setup in this chapter for a table of equations to use with the various current probes and settings.

· 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 amp setting instead as it offers ten times the resolution of the 250 amp range.

1.5.6 Applications

· checking air conditioning and mechanical equipment

· auditing energy use in commercial buildings

· determining tenant electrical consumption

· tracking environmental conditions

· confirming control sequences

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OWL Data Logger

1.6

OWL DC Voltage Data Logger

Features

The OWL DC Voltage Data Logger provides a versatile means of recording a variety of signals in a small, water-resistant enclosure. It can be configured for easy interface with common transducer outputs.

1.6.1 Description

The DC Voltage Logger can measure and record analog DC voltage covering 32 ranges from 120mV to 38.4V full scale. The model available is the OWL-400.

How it Works

The logger uses 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 into engineering units by an equation in TrendReader software.

1.6.2 Setup and Use

This section provides guidelines to follow to get started with the OWL DC Voltage Logger.

1. Connect the cable supplied to the signal being measured - see Figure 4.1

2. Run TrendReader Software and choose the DC Voltage equation.

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Range

Full Scale

Range

Full Scale

121.0 mVDC

2.431 VDC

241.9 mVDC

4.863 VDC

362.9 mVDC

7.294 VDC

483.9 mVDC

9.73 VDC

605.8 mVDC

12.18 VDC

726.8 mVDC

14.61 VDC

848 mVDC

17.04 VDC

969 mVDC

19.47 VDC

1.093 VDC

21.96 VDC

1.214 VDC

24.39 VDC

1.334 VDC

26.82 VDC

1.455 VDC

29.25 VDC

1.577 VDC

31.71 VDC

1.698 VDC

34.14 VDC

1.819 VDC

36.57 VDC

OWL Data Loggers

3. Select a range that best fits the expected data - see Table 4-1. DC Voltage ranges are

picked to match the transducer's full scale output value. For example, if a transducer with a 0 to 5 volt output is used then range number 18 which measures up to 7.3 VDC gives the best resolution.

4. Refer to the OWL Software driver for other options.

Figure 4.1: DC Voltage Wiring

Table 4.1: DC Voltage Ranges

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1.940 VDC

39.00VDC

1.6.3 Specifications

Voltage Input

Ranges: 0 to 120mV, 240mV ... 1.92V

Max Voltage: ±40VDC

Accuracy: ±1% full scale

Resolution: 0.5% (8 bits)

Input Impedance: > 100k ohms

Cable: 2m (6ft) length with PVC jacket to IP67 connector

Equation: 204

0 to 2.40V, 4.80V ... 38.4V

OWL Data Logger

1.6.3.1 Choosing Transducers

A transducer is defined as a device that receives energy from one system and retransmits it, in a different form, to another system. A transmitter is a term usually reserved for transducers in a current loop circuit. In this section, the terms transducer and transmitter will be used interchangeably.

For a transducer to be useful, the retransmitted signal must be compatible with standard instrumentation. For the OWL DC Voltage logger, this is in the form of an analog DC voltage.

Many compatible transducers exist for 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.

Excitation Voltage

This term refers to the input voltage that a transducer requires in order for it to work properly. It is either specified as a range (for example, 9 to 30 volts DC) or a specific voltage (for example, 10 volts DC). When a range is specified, it means you can use an unregulated power supply (such as a battery) as long as voltages within the range are provided. Usually, if a specific voltage is required, it means you require a regulated power supply.

When an unregulated power supply is specified for the excitation voltage, a regulated one may also be used. The reverse, however, is not true. Millivolt pressure transducers, for example, usually require regulated power supplies.

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OWL Data Loggers

Maximum Impedance

An important consideration when choosing transducers is the requirement for input or loop impedance. This simply refers to how much resistance your instrumentation (for example, the OWL logger) can have before it will begin to cause problems. For voltage inputs, a very high impedance is usually required (greater than 10k ohms). This prevents the unnecessary draining of current from the transducer circuit. The OWL DC Voltage logger's input is high impedance (greater than 100k ohm). Check the specifications 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 and are recommended for use with the OWL - see Figure 4-2.

Figure 4-2: Three Wire Transducer Connection

Four-Wire Transducers

Four-wire transducers fall into two categories: line-type and Wheatstone bridge types. The isolated supply appears as a line operated or isolated common that has no electrical connection to the output - see Figure 4-3. The bridge transducer provides a differential output

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(+/-), usually in the millivolt range - see Figure 4-4.

Figure 4-3: Line Type Transducer Connection

OWL Data Logger

Figure 4-4: Bridge Type Transducer Connection

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

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OWL Data Loggers

1.7

OWL 20 mA Data Logger

Features

The OWL 20mA Current Data Logger provides a versatile means of recording a process signal in a small, water-resistant enclosure. It is made to connect to 4-20mA type transmitter current loops.

1.7.1 Description

The 20mA Current Logger measures and records analog 0 to 24mA signals common in process control and instrumentation environments. The model 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.

1.7.2 Setup and Use

This section provides guidelines to follow to get started with the OWL 20mA Current Logger.

1. Connect the cable supplied into the current loop being measured - see Figure 5.1

2. Run TrendReader Software and choose the 20mA Current equation.

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3. Refer to the OWL Software driver for other options.

1.7.3 Choosing Transmitters

A transmitter is a term usually reserved for transducers in a current loop circuit. A transducer is a device that receives energy from one system and retransmits it, in a different form, to another system. For a transmitter to be useful, the signal must be compatible with standard instrumentation. This is analog DC current for the OWL 20mA Current logger.

Figure 5-1: 20 mA Current Wiring

OWL Data Logger

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.

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 OWL 20mA Current logger has a 100 ohm impedance). This helps to minimize the voltage requirements and power consumption of the circuit. Check the specifications for the transmitter to ensure the OWL's input impedance is acceptable.

Two-Wire Transmitters

Two-wire transmitters are transducers that form part of a current loop circuit. They vary the current flow in accordance with changes in the variable with which they are sensing. Most two-wire transmitters have a 4-20mA output. The connections are usually marked positive current loop (CL+) and negative current loop (CL-). A transmitter can be found in a wiring diagram by looking for a single common path. This type of transmitter is very popular and can

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OWL Data Loggers

be used with the OWL - see Figure 5-2.

Figure 5-2: Two Wire Transmitter Connection

Output

The specified output of a transmitter will determine whether it is compatible for use with the OWL 20mA Current 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. conductivity

2. pH probe

3. turbidity

4. carbon dioxide

5. dissolved oxygen

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· checking fluid level

· analyzing pneumatic and hydraulic pressures

· monitoring flow-meters

· testing process control loops

OWL Data Logger

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OWL Data Loggers

1.8

APPENDIX A Temperature Ranges

1.8.1 Temperature Ranges

The OWL Data Logger allows selection of ranges for each temperature equation entered. Use the following table to determine the most suitable range.

The list is sorted by midpoint and the size on either side follows the "±" sign. For example, the range 10.8 ± 47.1 °C (51.4 ± 84.8 °F) measures 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) between 12.7 °C (54.9 °F) and 27.9 °C (82.2 °F)

0.20 °C (0.36 °F) between 11.6 °C (52.9 °F) and 29.1 °C (84.3 °F)

Temperature

Ranges

*Note that the OWL temperature ranges are only applicable to the OWL-100 (Internal Sensor) and the OWL-200 (External Sensor) Data Loggers.

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OWL Data Logger

Table A-1: Temperature Ranges in Celsius

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OWL Data Logger

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OWL Data Loggers

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OWL Data Logger

Table A-2: Temperature Ranges in Fahrenheit

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OWL Data Loggers

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OWL Data Logger

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OWL Data Logger

Sample Rate

Days

Hours

Minutes

Seconds

8 sec.

3048

20 sec.

7142

1 min.

22187

2 min.

451214

5 min.

1131835

10 min.

2271310

1.9

APPENDIX B Sample Rates

Sample Rates

1.9.1 How a Data Logger Stores Readings

The sample rate of your data logger is the frequency with which it stores readings in its memory. A selected sample will apply for all channels on a SmartReader Plus.

If you set your data logger's sample rate to eight seconds, it reads its input channels and stores the readings once every eight seconds. If you choose a sample rate longer than eight seconds, the logger still reads its input channels once every eight seconds, and stores an averaged reading at the end of the sample interval you have chosen.

For example, if you use a two-minute sample rate, the data logger takes fifteen separate readings over each two-minute interval. At the end of each two-minute 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 sample rates. The Days, Hours, Minutes ,and Seconds columns list the time spans over which your logger will record readings at each sample rate.

For example, an OWL Logger, using a sample rate of ten minutes, will store readings for 227 days, 13 hours and 10 minutes. After that time, depending on how it was set up, the logger will either continue to take readings and replace the oldest readings with the new readings, or it will stop taking readings.

Table B-1: OWL Logger Sample Rate

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20 min.

455220

30 min.

6821530

OWL Data Loggers

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Index

- C -

Current 31

Applications 22

Probe 22

- D -

Data Logger 1

DC Voltage

Applications 26

Transducer 26

- E -

ET Series

ET-004 Low Temperature Probe 18

ET-016 General Purpose Probe 18

ET-081 High Temperature Probe 18

ET-086 Oven Temperature Probe 18

- L -

Logger 1

OWL 200 18

OWL 300 22

OWL 400 26

OWL 500 31

- P -

Process Signal

Applications 31

Transducer 31

- S -

Sample Rates 44

- T -

Temperature

Applications 16, 18

Probe 18

Range 35

Thermistor 16, 18

- V -

Voltage 26

Index

- 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

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