ACR Electronics SmartReader Plus User manual

Copyright © 2010 ACR Systems Inc. All Rights Reserved.
Reference Guide
IMPORTANT!
SmartReader Plus Data Loggers

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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.
Copyright © 2010 ACR Systems Inc. All Rights Reserved.
SmartReader Plus Data Loggers

SmartReader Plus is a Registered Trademark of ACR Systems Inc.
TRADEMARK NOTICES

ACR Systems Inc. warrants the hardware to be free from defects in workmanship and
components for one year from the date of purchase, provided they are not abused or
subjected to detrimental conditions.
Software is warranted for one year from the date of purchase, to operate in accordance
with its programmed instructions. It is not warranted to be error-free. If the product does
not perform in accordance with this Limited Warranty, ACR will at its discretion, either
repair or replace the product free of charge. There will, however, be a charge for freight
and Canadian Customs clearance (if applicable). Any replacement hardware or software
will be warranted for the remainder of the original warranty period. To the maximum
extent permitted by applicable laws, ACR Systems Inc. disclaims all other warranties,
either expressed or implied, including but not limited to, implied warranties of fitness for a
particular application. In no event shall ACR Systems Inc. be liable for any
inconveniences, loss, damages, etc., whatsoever arising out of the use of this product.
ACR's policy is not to proceed with any repairs or replacement unless first discussed with
ACR's Technical Support Analysts and an RMA (Return Material Authorization) number is
issued.
LIMITED WARRANTY

I
Contents
Copyright © 2010 ACR Systems Inc. All Rights Reserved.
Table of Contents
Section I SmartReader Plus Data Logger 1
............................................................................................................................................11 Introduction to SmartReader Plus Data Loggers
........................................................................................................................................................... 1Features
........................................................................................................................................................... 1
Description
........................................................................................................................................................... 2
Programmed Operation
........................................................................................................................................................... 2How SmartReader Plus Loggers Take Readings
........................................................................................................................................................... 3
How to Use SmartReader Plus Loggers
........................................................................................................................................................... 5
Specifications
........................................................................................................................................................... 7Product Approvals
............................................................................................................................................82 SmartReader Plus Software Driver
........................................................................................................................................................... 9Logger Status
................................................................................................................................................. 10
Logger Sampling
................................................................................................................................................. 10Fast Sampling
................................................................................................................................................. 11
Logger Memory
................................................................................................................................................. 14
Logger Alarms ................................................................................................................................................. 15Delay Before First Call
................................................................................................................................................. 15Delay Between Calls
................................................................................................................................................. 16Delay After Backup
................................................................................................................................................. 17Baud Rate
................................................................................................................................................. 18Alarm Dialout String
........................................................................................................................................................... 19Logger Channels
................................................................................................................................................. 19
Channel Information
................................................................................................................................................. 21
Channel Alarms
................................................................................................................................................. 21
Channel Calibration
........................................................................................................................................................... 22Logger Connection Settings
............................................................................................................................................263SmartReader Plus 1 Temperature Logger
........................................................................................................................................................... 26Description
........................................................................................................................................................... 26
Setup
............................................................................................................................................28
4SmartReader Plus 2 Temperature & Relative Humidity Logger
........................................................................................................................................................... 28Description
........................................................................................................................................................... 28
Setup
........................................................................................................................................................... 29
Accessories
........................................................................................................................................................... 30Troubleshooting
........................................................................................................................................................... 31Relative Humidity Calibration
........................................................................................................................................................... 31Specifications
............................................................................................................................................33
5SmartReader Plus 3 Current, Voltage and Temperature Logger
........................................................................................................................................................... 33
Description
........................................................................................................................................................... 34Setup to Measure Current

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Copyright © 2010 ACR Systems Inc. All Rights Reserved.
........................................................................................................................................................... 35Voltage Channels
........................................................................................................................................................... 36
Current Probes and Accessories
........................................................................................................................................................... 36
Specifications
........................................................................................................................................................... 37Troubleshooting
............................................................................................................................................38
6SmartReader Plus 4 Pressure, Temperature and RH Logger
........................................................................................................................................................... 38
Description
........................................................................................................................................................... 39Setup
........................................................................................................................................................... 40Pressure Calibration
........................................................................................................................................................... 41Specifications
............................................................................................................................................42
7SmartReader Plus 4 Low Pressure Differential and Temperature Logger
........................................................................................................................................................... 42
Description
........................................................................................................................................................... 42Setup
........................................................................................................................................................... 43
SRP4 LPD Pressure Specifications
............................................................................................................................................44
8SmartReader Plus 5 Thermocouple Logger
........................................................................................................................................................... 44Description
........................................................................................................................................................... 44Setup
........................................................................................................................................................... 44Use
........................................................................................................................................................... 46
Specifications
........................................................................................................................................................... 46
Manual Calibration
............................................................................................................................................479SmartReader Plus 6 Thermocouple Logger
........................................................................................................................................................... 47
Description
........................................................................................................................................................... 47
Setup
........................................................................................................................................................... 48Use
........................................................................................................................................................... 48Specifications
........................................................................................................................................................... 49Manual Calibration
............................................................................................................................................50
10 SmartReader Plus 7 Process Signal Logger
........................................................................................................................................................... 50
Description
........................................................................................................................................................... 50Setup
........................................................................................................................................................... 52
Choosing Input Channels
........................................................................................................................................................... 53
Customizing Input Ranges
........................................................................................................................................................... 57Selecting Transducers and Transmitters
........................................................................................................................................................... 58Specifications
............................................................................................................................................6011 SmartReader Plus 8 Eight-Channel Temperature Logger
........................................................................................................................................................... 60
Description
........................................................................................................................................................... 60
Setup and Use
............................................................................................................................................6212 SmartReader Plus 9 Pulse Logger
........................................................................................................................................................... 62
Description
........................................................................................................................................................... 62
How the SmartReader Plus 9 Counts
........................................................................................................................................................... 63Setup and Use

III
Contents
Copyright © 2010 ACR Systems Inc. All Rights Reserved.
........................................................................................................................................................... 63Specifications
............................................................................................................................................65
13 SmartReader Plus 10 RTD Temperature Logger
........................................................................................................................................................... 65
Description
........................................................................................................................................................... 65Setup
........................................................................................................................................................... 66
Specification of RTD Channels
............................................................................................................................................67
14 Conservation Logger Temperature, RH and 5V Input Logger
........................................................................................................................................................... 67Description
........................................................................................................................................................... 68Setup
........................................................................................................................................................... 68Accessories
........................................................................................................................................................... 68
Relative Humidity Calibration
........................................................................................................................................................... 69
Troubleshooting
........................................................................................................................................................... 69Specifications
............................................................................................................................................71
15 APPENDIX A Monitoring Resistance and Switch Status
........................................................................................................................................................... 71
Measuring Resistance
........................................................................................................................................................... 71Monitoring Switch Status
............................................................................................................................................7316 APPENDIX B Temperature and Relative Humidity Calibration
........................................................................................................................................................... 73Temperature and Relative Humidity Calibration
........................................................................................................................................................... 73
Thermistor Calibration
........................................................................................................................................................... 76
Relative Humidity Calibration
............................................................................................................................................7917 APPENDIX C Thermistor Temperature Probes
........................................................................................................................................................... 79
Thermistor Temperature Probes
........................................................................................................................................................... 79
What are Thermistors?
........................................................................................................................................................... 79ET Series Temperature Probes
........................................................................................................................................................... 80Setup and Use
........................................................................................................................................................... 81Specifications
........................................................................................................................................................... 85
Resistance vs. Temperature Tables
........................................................................................................................................................... 90
Custom Probes
............................................................................................................................................9118 APPENDIX D Typical SmartReader Plus 3 Connection Diagram
........................................................................................................................................................... 91
AC Current and AC Voltage Recording
........................................................................................................................................................... 92
AC Voltage Transducer Specifications
............................................................................................................................................9419 APPENDIX E Sample Rates
........................................................................................................................................................... 94How a Data Logger Stores Readings
........................................................................................................................................................... 94Sample Rate Tables
............................................................................................................................................100
20 APPENDIX F Connecting Multiple Loggers
........................................................................................................................................................... 100
Network Configurations
........................................................................................................................................................... 101Basic Network
........................................................................................................................................................... 102
Modular Network
........................................................................................................................................................... 103
Shielded Network
........................................................................................................................................................... 103Connection Problems and Solutions

SmartReader Plus Data Loggers
IV
Copyright © 2010 ACR Systems Inc. All Rights Reserved.
Index 105

WELCOME
Congratulations on your purchase of a SmartReader Plus 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 2.0
software and frequently refers to TrendReader 2.0 conventions and procedures. To get
the most from your logger, please take time to familiarize yourself with TrendReader 2.0
and its Reference Guide.
For important information on how all SmartReader Plus data loggers work and how to use
them, read the Introduction to SmartReader Plus 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 specifically with the type of SmartReader Plus logger you have.

SmartReader Plus Data Loggers
1
Copyright © 2010 ACR Systems Inc. All Rights Reserved.
SECTION 1 SmartReader Plus Data Logger
1.1 Introduction to SmartReader Plus Data Loggers
SmartReader Plus data loggers 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.
Different SmartReader Plus models are available to directly measure and record variables
such as temperature, relative humidity, pressure, electric current, analog voltage, current loop
and pulses. Each model can reliably record time-based data for later analysis by
TrendReader software.
TrendReader software must be installed and ready to run prior to making use of the setup
instructions in this section of the guide.
1.1.1 Features
SmartReader Plus data loggers share many common features that make them useful tools for
data collection:
·Pocket-sized
·Solid-state components - no moving parts
·Low-power microprocessor controlled circuitry
·12-bit high resolution readings
·Precision on-board thermistor temperature sensor (except the SmartReader Plus 9)
·High capacity lithium battery
·Quartz clock crystal
·Magnetic backing and secure locking hole
·Rugged die-cast Noryl® case
·Convenient terminal block connector
Figure 1: SmartReader Plus data loggers
1.1.2 Description
SmartReader Plus loggers can run continuously, constantly measuring and recording readings
from any enabled channel. They can also start logging at a specified time. Self-powered by a

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Copyright © 2010 ACR Systems Inc. All Rights Reserved.
long-life lithium battery that will provide years of reliable operation, your SmartReader Plus can
work independently from any external power supply or computer. When you are ready to look
at the data it has collected, it can transfer all information to your computer through the use of
TrendReader software.
Main Components
The main components of the SmartReader Plus data loggers include:
·a memory chip that has the capacity to store up to 1 million readings (see
Specifications)
·a microcontroller and 12-bit analog-to-digital converter (A/D) that converts all input
signals to digital values
·a quartz clock crystal that accurately keeps track of time and regulates the taking of
readings
·an accurate on-board thermistor (except the SmartReader Plus 9) that the logger uses
to measure ambient temperature via changes in resistance
·a lithium battery that provides power to the logger and internal or external sensors
1.1.3 Programmed Operation
SmartReader Plus data loggers run according to settings that you program. These
pre-selected settings are stored in the logger's memory and instruct it to:
·take readings at regularly spaced intervals either at slow or fast sample rates
·take readings from specific channels that you enable
·associate each channel with an equation in TrendReader software
·start readings with or without a delay
·take readings continuously, or stop when memory is full
1.1.4 How SmartReader Plus Loggers Take Readings
Each SmartReader Plus data logger (except the SmartReader Plus 9) has an on-board
thermistor that you can use to record ambient temperature. Depending on which SmartReader
Plus model you have, you can turn this temperature-monitoring capability on or off using
software. You can also record other information by connecting sensors, transducers or
external circuitry to the plug-in terminal block.
SmartReader Plus data loggers can record readings in two selectable modes:
1. First-in, First-out (FIFO)*. In this mode the logger continues to take readings when its
memory is full (to make room, it discards the oldest reading every time it adds a new
one). Thus, the memory will contain a "sliding window" of information.
2.Stop when Full. The logger stops recording when its memory is full.
* Not available in "Fast Mode."
You can set the time interval at which your logger saves readings using TrendReader
software. The sample rate you select will apply to all enabled channels. At a sample rate of
eight seconds, one reading is taken every eight seconds and saved to memory. As you slow

SmartReader Plus Data Loggers
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Copyright © 2010 ACR Systems Inc. All Rights Reserved.
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 readings in a buffer (a temporary memory) where it is
retained until the sampling interval is over.
When you backup a logger's data to 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 each logger channel. The result is a collection of accurate
time-based data ready for detailed graphing and analysis.
1.1.5 How to Use SmartReader Plus Loggers
Using your SmartReader Plus data logger for most applications is a simple process. With
proper planning, setup and installation of your data logger, you can be assured that the
information you collect will be both correct and useful. The following provides general
procedures for using SmartReader Plus data loggers. For additional and specific information
on these steps, refer to the chapter in this manual that deals with your particular SmartReader
model.
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?
Setup
To set up your SmartReader Plus data logger you must first have TrendReader software
installed and running on your computer. You can then configure your logger with various
options by talking to it via the interface cable.
Set Sample Rate
Always confirm the sample rate (how often the logger saves readings) to make sure it will be
acceptable for your application. You can alter the frequency at which your SmartReader Plus
logger records readings by changing the sample rate. You can choose rates from 8 seconds
to 8 hours in the normal mode. In Fast Read mode, you can select between 0.04 seconds and
2 minutes, with the use of an external power supply or battery pack. The sample rate chosen
will apply to all the active channels on the logger.
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
my computer (for example, the trip back to the office)?
·How often do readings need to be taken?
NOTE: To activate readings in the Fast Read mode, an external power source

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Copyright © 2010 ACR Systems Inc. All Rights Reserved.
must be connected to the data logger.
Making External Connections
If you are using your SmartReader Plus data logger to monitor external modules, sensors, or
circuitry, make sure the connections are tight. Also, make sure the terminal block is snapped
securely into the logger.
For permanent applications, wiring connections can first be made to the logger's removable
terminal block. The terminal block can then be attached (with glue for example) to a
permanent fixture. When it comes time to analyze data, the logger can simply be unplugged
from the terminal block and brought back to your computer. After backing up the data, the
logger can be returned and plugged back into the terminal block. Extra terminal blocks are
available from your sales representative. When unplugging the terminal block from your
logger, use care to pull it straight out so as not to break the plastic casing.
Enable Channels
Always make sure that you have enabled and verified the correct channels for your
application. This is very important as it can be distressing to find out later that the information
you hoped to collect was from an inactive channel. You can selectively enable additional
channels in your SmartReader Plus as required. However, in order to avoid using logger
memory unnecessarily, disable any channels which are not required.
Clear Memory
Before starting a logging session, clear the logger's memory. This will help to keep the
collected files smaller as well as decrease the time needed to backup the logger later. Note
that clearing the memory is automatic if you save setup changes (for example, assign different
equations, change sample rate, etc.).
Test
You can directly read the values that your SmartReader Plus 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
If you are working with more than one data logger, label each logger, identifying the task and
location before you distribute them throughout a building or system. To do this, you can simply
use a shipping tag. Later, when you retrieve them to graph their data, you will know what each
graph refers to.
Mounting
Use the magnetic backing to conveniently mount your logger on metal surfaces like ductwork
or electrical control cabinets. If you are 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 SmartReader Plus loggers are so light, you can use special
mounting fasteners like Velcro® to attach them to almost any surface. Make sure your
logger's mounting method will last the full length of your logging session.
Do not rely on the logger's magnetic strip for adhesion if the mounting surface is uneven,
unstable or above 65°C (150°F).

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Copyright © 2010 ACR Systems Inc. All Rights Reserved.
Cold or Humid Environments
Make sure that the environment you will be placing your logger into will be acceptable by
referring to the Specifications in this chapter. If conditions are not adequate for the logger,
consider using a protective enclosure. For humid conditions you can protect your logger
simply by placing it in a zip-lock plastic bag.
When you place your SmartReader Plus logger in a cold environment, make sure
condensation will not settle on the logger when you bring it back into warmer surroundings,
such as an office. The best way of preventing moisture is to place the logger in a container
and include a desiccant (a material that absorbs moisture). When you bring your logger back
to your computer, leave the logger in the container until it has had a chance to warm up to the
surrounding temperature. You can then take it out and analyze it.
Keep Track
Make sure you 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 SmartReader Plus 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 Specifications
General
Size: 107 x 74 x 22mm (4.2" x 2.9" x 0.9")
Weight: 110g (3.75 oz.)
Case Material: Noryl® Plastic
Operating Limits: -40 to 70°C (-40 to 158°F) and 0 to 95% Relative Humidity
(non-condensing)
Clock Accuracy: ±2 seconds/day
Battery: 3.6 Volt Lithium, 1 Amp-hour

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Copyright © 2010 ACR Systems Inc. All Rights Reserved.
Memory Sizes:
Model
Readings
Bytes
32 KB
21,500
32 KB
128 KB
87,000
128 KB
1.5 MB
1,048,000
1.5 MB*
*See specific model for availability.
Sampling Methods: 1. Continuous (First-in, First-out)*
2. Stop when full (Fill-then-stop)
*Not available with sample rates faster than 8 seconds.
Sample Rates: User-selectable rates from 25 per second to every 8 hours.
(BP-101 battery pack required for sample rates less than 8
seconds).
Resolution: 12-bit (1 part in 4096)
Power Consumption: 5 to 10 microamps (continuous)
Battery Life: Ten years (under normal use) factory replaceable.
External Connector: Removable screw-type terminal strip with Common (-)
connection.
Resistance to X-rays: Tested for protection against a 160kV 150mA-sec. dose @
38" FFD (about 100times that of an X-ray machine). Tested
for protection against Gamma Ray (equivalent to 0.137-1.38
megavolts) IR192-28 curies @ 30-second exposure source to
object distance 5".
Internal Temperature Sensor*
Type: NTC thermistor; 10k ohms at 25°C (77°F)
Range: -40 to 70°C (-40 to 158°F)
Accuracy: ±0.2°C between 0 to 70°C (±0.3°F between 32 and 158°F)
Resolution: 0.03°C (0.05°F) at 25°C (77°F)
Better than 0.07°C (0.12°F) between -25 and 70°C (-13 and
158°F)
Better than 0.13°C (0.23°F) between -40 and -25°C (-40 and
-13°F)
Equation: Use Equation 45 in TrendReader software
Specifications are subject to change without notice.
* The SmartReader Plus 9 does not have an on-board temperature sensor.

SmartReader Plus Data Loggers
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Copyright © 2010 ACR Systems Inc. All Rights Reserved.
1.1.7 Product Approvals
Meets Part 15 for Digital Devices of the Code of Federal Regulations of the Federal
Communications Commission (FCC). Meets Class A radiated and conducted emission
requirements of Section 2 of the Radio Interference Regulations of Communications Canada,
IEC801-2, 3, 4 and EN55011 covering ESD, RFI Immunity, EFT/Burst and Radiated
Emissions respectively for the Commission of the European Communities (CE).

SmartReader Plus Data Logger 8
Copyright © 2010 ACR Systems Inc. All Rights Reserved.
1.2 SmartReader Plus Software Driver
TrendReader software uses a software driver to communicate with SmartReader Plus 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 Channels. Status contains information about sampling, memory and alarms. Each
channel of the logger contains information about the description, equation and Realtime value,
alarms, and calibration associated with the channel. 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

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Copyright © 2010 ACR Systems Inc. All Rights Reserved.
open, thereby allowing you to make changes in other features.
NOTE: SmartReader Plus data loggers can be connected together in a network.
For information on networks, see Appendix F Connecting Multiple Loggers.
1.2.1 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 Alarms.

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Copyright © 2010 ACR Systems Inc. All Rights Reserved.
1.2.1.1 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 8 hours, while in fast sampling, the rates can be as quick as 25 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
shown. Note that millisecond sample rates are only applicable with fast sampling.
To find out more about sample rates and to view a set of sample rate tables, see Appendix E
Sample Rates.
Fast Sampling
1.2.1.1.1 With the fast sampling mode, you can select sample rates from 0.04 seconds (25 readings per
second) to 2 minutes. An external power source, such as an active computer communications
port, power supply or battery pack, is required to operate the logger. The only memory mode
available is "Stop When Full".

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Copyright © 2010 ACR Systems Inc. All Rights Reserved.
*Note that the logger will stop recording (go dormant) when you communicate with it.
Therefore, if you want to perform fast sampling with the logger connected to your
computer, you need to turn off Realtime.
To ensure that the logger takes data at the correct time, it is best to use the delayed start
feature. The logger will begin to take readings when you connect the power source, providing
the start delay has expired. Otherwise, the logger will start when the start delay times out if it
has external power applied to it prior to the timing out of the start delay. Therefore, you need
to set the start delay long enough for you to have time to save the setup and, if necessary,
disconnect the logger and connect the battery pack or power supply. If you disconnect the
logger, first set a delay of at least 16 seconds, then disconnect the logger within 8 seconds for
proper operation.
When you are using sample rates as short as 0.04 seconds, you can run out of logger
memory very quickly (two active channels at 0.04 seconds gives you 7 minutes and 10
seconds of memory). It is important that you do not waste any logger memory by starting the
logger too soon or by leaving unused channels active.
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.
1.2.1.2 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. In 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.
The capacity, or length of time for data capture of the logger is determined by the logger
model, the number of active channels, and the sampling rate. Loggers come in 3 memory
models: 32KB, 128KB, and 1.5MB. (If you want, you can choose to use only a portion of the
available memory when you select the end time for the data capture). To find out more about
how the capacity is affected by the sample rate and active channels, see Appendix E Sample
Rates.
To set how the logger stores its data, click on the Usage field and select FIFO or Stop When