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Event & Timing Data Loggers

Event & Timing Data Loggers

Most data loggers simply take measurements and record them regularly at fixed time intervals. But what if you don’t want to record continuously, but you just want to know when an event happens? For example you might need to know when a motor switches on or off, or when the power drops out and for how long. It’s not convenient to use a regular data logger for this, as you’ll get large amounts of data that you have to process just to find out a small piece of information, and the logger’s memory could even fill up before it records the event you’re interested in. 

The solution is to use an event data logger, which monitors its inputs and only records data when a specified event happens. There are only a few such devices on the market. Some are general purpose with “dry contact” connections; some can be fully programmed to log whatever events you want based on whatever inputs you have; while others are designed for specific purposes such as monitoring mains power for outages, surges and sags. Scroll down to see our selection.

AEMC Event Data Logger

AEMC Data Logger Model L452

The Model L452 is a low cost, simple to use, two-channel data logger. It records DC voltage, DC current, pulses and events. Its two input channels allow the user to connect to various types of sensors in order to record data such as pressure, temperature, flow, humidity and more.

AEMC Data Logger Model L452
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AEMC Data Logger Model L452

The Model L452 is a low cost, simple to use, two-channel data logger. It records DC voltage, DC current, pulses and events. Its two input channels allow the user to connect to various types of sensors in order to record data such as pressure, temperature, flow, humidity and more. This logger can also be used to record events such as machine run time. Each channel’s real-time measurement is displayed on the LCD screen.

The L452 communicates via USB or Bluetooth for configuration and data transfer to a PC using the free DataView software included with the unit. The logger can also be configured using its front panel with a very simple user interface.


ChannelsTwo with LCD display
Input4mm safety banana jacks
Ranges (4)100mV/1V/10V, 4 to 20mA, Event & Pulse
Accuracy± 100mV, ±1V, ±10V:  ±(0.5% R +1ct)
 4 to 20mA ±(0.25% R +5ct)
ResolutionPulse: 3.3V (with 1MΩ pull up resistor)
 Event: ± 10V
Input ImpedanceV DC: 1MΩ, DC current: 100Ω Event: 1MΩ, Pulse N/A
Sample Rate MaxV & Current DC: 5 samples/s, Event 16 samples/s, Pulse 100 samples/s
Storage RateProgrammable from 200 ms to 60 minutes
Storage ModesStart/Stop
Recording Length15 minutes to 6 weeks, programmable using DataView
Memory32MB recorded data is stored in non-volatile memory and will be retained even if battery is low or removed.
CommunicationUSB 2.0, Bluetooth 2.1 Class 1 (100m)
Power Source2×1.2V 400mAh NIMH
Charger (Supply)Rechargeable by main 110 to 240V 50/60Hz or via USB cable
Battery Life (Display ON)18 days @ 200ms sampling rate, 27 days @ 60s
Battery Life (Display OFF)36 days @ 200ms sampling rate, 270 days @ 60s
Dimensions4.92 x 2.60 x 1.30” (125 x 66 x 33mm)
Weight (with battery)7.4 oz (210g)
Operating Temperature32° to 122°F (0° to 50°C)
Storage Temperature-4° to 140°F (-20° to 65°C)
Relative HumidityUp to 90% @ 104°F (40°C)
Ingress Protection (IP)IP40
EMCEN 61326-1
Safety ComplianceIEC 61010-1, EN 61010-2-30

Data sheet on AEMC Data Logger Model L452 (pdf, opens in a new tab)

SMARTlogger TOU (Time of Use) Data Loggers –
DISCONTINUED, Limited stock available

Some energy usage questions are deceptively simple.

“When do the lights come on?” or “What’s the total run time of this motor this month?”
But even simple questions can have answers that add up to significant dollars, and that’s why it makes sense to take stock of energy usage.

The SMARTlogger TOU series of instruments are designed to monitor the On/Off status, Time-of-Use operating schedule, and Total On-Time for energy consuming devices and systems. Models are available for lighting systems, motors, relays and switches, and virtually any electric load. The non-contact monitoring makes installation simple. Each of these small, robust instruments provide power data for superior energy management.

Prices do not include GST and may change without notice.

Dent Instruments’ SMARTlogger Time of Use (TOU) Monitors are designed to monitor, record and analyse the most critical information of lighting and equipment: its On and Off timings. These loggers not only measure ON/OFF transitions of devices, but also calculate the total On time, and the percentage On time as well.

The On and Off states are detected via a choice of sensors: Light, Magnetism, Current, or Dry Contact. Each of these sensor types has adjustable thresholds so the loggers will work in a wide variety of applications.

The TOU loggers are suitable for measuring power use in equipment with constant load, such as heaters, lights, electric motors etc. From this information you can also calculate the energy usage, if you know the typical current draw of the equipment.

Key Features:

  • Adjustability…LIGHTINGlogger is adjustable to a wide range of light levels, while the MAGlogger is adjustable to above 40 mGauss, and the CTlogger to above .25 amp. (CONTACTlogger utilizes dry contacts.)
  • Measures Total On-Time and On/Off transitions of almost any device. Use with lights, motors, gas valves and more!
  • Instantly see what your logger has recorded. All SMARTloggers come with a 5-digit LCD showing the On-Time and Percent-On.
  • Storage capacity of 8,000 records and ring memory–record for months or years.
  • SMARTware Windows-based software package for easy data retrieval and analysis, including kWh calculations, total on-time rate schedule graphs and summaries, load profile graphs, summary statistics and time series analysis.
  • Easy importing/exporting of CSV data files for use with Microsoft Excel and other popular programs.
  • Non-intrusive attachment using powerful rare earth magnets, Velcro strips, or a mounting hole. Easily secured out of sight.
  • Compact and tough; made of heavy plastic, only 2.5″ x 1.5″ x .75″ (6.3 x 3.8 x 1.9 cm) and weighing only 1.5 ounces (40 gm)
  • User-replaceable battery with industry-leading 5+ year life span
  • All SMARTloggers have a three-year warranty.

Inputs: depends on the particular model: Internal sensors or current transformer (CT logger)
Display: 5 digit LCD showing Total On Time, Percent On, and an indicator for current On/Off status
Time Stamps: Month, day, year, hour, minute and second.
Resolution: One second
Minimum On/Off Event Duration: 2 seconds
Data Analysis: Statistics, summaries, graphs and export ability
Memory: 32,576 records, ring memory
Communications: USB using the SMARTlogger communication cable
Sensitivity: LIGHTINGlogger – adjustable; MAGlogger – 40 mGauss min.,
CTlogger – 0.25 amp min. The “Off” threshold may be set, to allow for, e.g. “always on” heater elements.
Real Time Clock: Crystal controlled, true calendar, 20 ppm accuracy (<1 minute/month)
Battery Life: 5 years typical
Operating Temp: 0 to 60 °C (32 to 140 °F)
Operating Humidity: 5% to 95% non-condensing
Dimensions: 6.3 x 3.8 x 1.9 cm
Weight: 40 gm

SMARTlogger Datasheet (pdf, opens in a new tab)

SMARTlogger/SMARTwareOperator’s Guide (pdf, opens in a new tab)

See below for more Technical Tips on these loggers

LIGHTING Time-Of-Use Monitor and Data Logger


  • Monitors and Records On-Time in Lighting Systems, from which you can calculate Energy Usage
  • Stores 32,000 Readings/Samples
  • Battery-Powered with 5 Year User-Replaceable Battery
  • LCD Display and 1 Hz Sampling Rate
  • Requires SMARTware® Software for Data Analysis and Data Export

4G-TOU-L Dent Instruments Smartlogger Time-Of-Use logger with Light Sensor: $285+GST (8/15)
Requires software and cable for initial setup and data download (see below)

Fibre Optic Attachment for TOU-Lighting logger

TOU with fiberoptic sensorWhat if you’re dealing with a light fixture where there’s no easy access to the light source, or you need to isolate one light specifically and tune out the rest? The answer is the Fibre Optic Attachment for the LIGHTINGlogger. This flexible fibre optic wire snaps onto any 3G or 4G LIGHTINGlogger. Simply bend the attachment so it points towards the light source you want to monitor. You could even use this to monitor the ON bezel light of a piece of equipment, instead of using one of the other TOU loggers.

TOU-FO-1FT Fibre optic attachment for LIGHTINGlogger, 1 foot: $36+GST
TOU-FO-2FT Fibre optic attachment for LIGHTINGlogger, 2 foot: $42+GST
TOU-FO-xx Fibre optic attachment for LIGHTINGlogger, custom length: $37+GST plus $4.50 per 30cm increment

Contact Time-Of-Use Monitor and Data Logger


  • Monitors and Records On/Off Status and Total Time or External Relays and Switches
  • Stores 32,000 Readings/Samples
  • Battery-Powered with 5 Year User-Replaceable Battery
  • LCD Display and 1 Hz Sampling Rate
  • Requires SMARTware® Software for Data Analysis and Data Export

4G-TOU-CONT Dent Instruments Smartlogger Time-Of-Use logger with dry contact input: $285+GST (8/15)
Requires software and cable for initial setup and data download (see below)

Mag Time-Of-Use Monitor and Data Logger


  • Monitors and Records Magnetic Fields in Motors, Fans and Compressors
  • Stores 32,000 Readings/Samples
  • Battery-Powered with 5 Year User-Replaceable Battery
  • LCD Display and 1 Hz Sampling Rate
  • Requires SMARTware® Software for Data Analysis and Data Export

4G-TOU-M Dent Instruments Smartlogger Time-Of-Use logger with magnetic field sensor: $285+GST (8/15)
Requires software and cable for initial setup and data download (see below)

Frequently Asked Questions

Frequently Asked Questions

Will my MAGlogger be able to sense a load if I just place it on the incoming line?
The MAGlogger can be used successfully without actually placing it on or near the actual device you are measuring. Sometimes you may need to experiment with the orientation of the logger or you may need to adjust the sensitivity. The MAGlogger will sense any signal greater than 40 milligaus. The MAGlogger will not sense a load if the L1 and L2 lines are close together as they tend to cancel each other out.

What type of information are the SMARTlogger instruments designed to provide?
Total running time, transition times, peak load times, kWh, and more.

How many records can a SMARTlogger store?
Memory is rated by number of transition points (on’s & off’s) and is 32,000.

Are TOU (time-of-use) instruments the same as SMARTloggers?
Yes. TOU simply stands for time-of-use, while SMARTloggers™ is the trade name we give our series of TOU loggers.
Does the MAGlogger require me to mount it directly on my dirty, hot, vibrating motor? No, you can simply place it next to the incoming power line and the internal magnetic sensor will sense the flow of electricity and trigger the transition data.

Is there an instrument I can use to simply monitor the running time of a stand-alone device that has a cord?
Yes, you may use the CTlogger.

If I use a MAGlogger to monitor a load, can I get kwH calculations?
Yes, by simply asking the software to set the kW scale factor then reading the results in the summary.

How long does the battery last with the SMARTloggers?
The typical battery life of the SMARTloggers is 5 years. The battery is user replaceable. Contact Esis for availability.

SMARTware Software for TOU SMARTloggers

SMARTware Software for TOU SMARTloggersAll SMARTloggers use SMARTware 11 software that makes it easy to analyze and visually present monitored data. SMARTware provides a number of “one-touch” analyses including summary statistics, transition and time series data points, and multiple logger file aggregation. Easily perform analyses by TOU rate periods, such as Rate Schedule Analysis and create run-time, time series, on-time and load profile graphs. SMARTware also allows for CSV file export; view your data in popular spreadsheet programs such as Microsoft Excel or Access.

SMARTware 11 is compatible with Windows 8, Windows 7 (32- and 64-bit), and Windows XP.

  • All SMARTloggers use SMARTware Windows-based software that makes it easy to analyze and visually present recorded data.
  • Monitor usage trends with the click of a mouse.
  • Pre-programmed graphs and analysis functions make understanding your data simple.
  • Easily export usage data into other popular spreadsheet and database programs
  • Extremely flexible to accommodate a wide range of measurement needs.

SMART-COM-PAK SmartWare Software and USB Interface Cable for SMARTloggers: $225+GST (9/17)
Note: this item used to be 4G-TOU-SW

Technical Tips for SMARTloggers

Adjusting the Trip Point in a difficult location

About setting up the TOU loggers. The software does not come into it at all. If you are up a ladder, attaching a lighting logger to a light fitting, the last thing you need is to have is a laptop balanced there, reading a real-time reading, whilst you adjust the trip point.

Setup the TOU Logger for a Monitoring Session

  1. Double click on the SMARTware icon on the Windows® Desktop to start the application.
  2. Connect the logger to a computer USB port with the USB Communication cable.
    Note: SMARTware 11 works with Windows, 7 both 32 bit and 64 bit, Windows Vista and XP, but not earlier Windows operating systems.
  3. With SMARTware open, click on Logger, and then Logger Clock to set the Logger’s real-time clock to the correct, local time.
  4. (Optional) Use Logger… Edit Logger Description Line… to include an additional description in the logger.

Begin Monitoring

  1. Disconnect the logger from the communication cable.
  2. Choose an appropriate location to place your TOU SMARTlogger. (Refer to Manual page 7.)
  3. If using a LIGHTING, MAG, or CTlogger, you may wish to set the logger’s sensitivity level. (Refer to Manual page 8.)
  4. Verify that the ON symbol On Symbol Dent TOU ON symbol is displayed, when the device being monitored is on, and that the symbol disappears when the monitored device is off.
  5. Clear the logger’s memory with the RESET switch:ush and hold the button for several seconds until the display shows “rESEt.”
  6. Record the logger’s location and serial number on a separate piece of paper for easy retrieval later.
  7. Tip: Sometimes taking a photo of the installation can make finding the logger at retrieval much easier.

TOU Logger annotated


The unlabeled hole near the left edge in the middle of the LIGHTING logger contains the light sensor. Install the LIGHTINGlogger so that the light sensor is aimed toward the light source to be monitored and away from any stray light sources, such as lamps or windows, which could cause false monitoring.

Watch for security lights that are on continuously.
When monitoring fluorescent lighting, place the LIGHTINGlogger inside the fixture and attach using the magnets on top.
When monitoring incandescent lighting, high temperatures must be considered.
The maximum temperature rating of all SMARTloggers is 60°C.
In terms of distance, that is approximately 20 cm (8 inches) horizontally from a 100 watt bulb in free-moving air.
If it is not possible to mount the logger at an appropriate distance using the magnet supplied, then hang it with wire, or attach it with adhesive tape, or Velcro.

TOU with fiberoptic sensorTech Tip: Use a Ziploc or similar plastic bag to protect the logger from moisture.

For high temperature or hard-to-reach locations, DENT Instruments offers a long-reach, flexible, fiber optic sensor, so that you can place the logger conveniently away from the light fixture.

These fiber optic sensors are available in custom lengths from one foot up to twenty feet long. Contact Esis Pty Ltd for availability.

CT logger:

Simply clip the CT (current transformer) over any conductor carrying 0.25 amp AC or more.

Secure the logger itself with Velcro® or duct tape. Use a Ziploc bag to protect the logger from moisture, if necessary.
Take care to protect the CT from moisture as well.

The logger is activated when there is more than 0.25 amp of current flowing through the wire to the device being monitored. The logger is sensing the load when the ON symbol Dent TOU ON symbol TOU On symbol shows in the display.

Set the Logger Sensitivity

LIGHTINGIogger: You can adjust the LIGHTINGlogger for various ambient light conditions by turning the screw labeled “SENSITIVITY.”

The LIGHTINGlogger is sensing the lights when the ON symbol TOU On symbol Dent TOU ON symbol is shown in the LCD. Adjust the sensitivity using a small screwdriver so that, in the highest ambient light conditions and with the light to be monitored off, the logger is off (ON symbol is missing). The logger should then show the ON symbol when the monitored light is turned on.

Using a screwdriver to turn the sensitivity screw clockwise towards the “+” will make the LIGHTINGlogger more sensitive to light. DO NOT TURN TOO MUCH! THE SCREW WILL ONLY TURN THROUGH ABOUT 270°.

Greater sensitivity allows it to be used in areas of low ambient light and will allow a dimmer light source to activate the LIGHTINGlogger.

Making the LIGHTINGlogger less sensitive to light allows it to be used in areas of high ambient light without activating until the monitored light is turned on.

DataTaker Data Loggers

DT80-85From two channel data loggers up to systems with hundreds of analog inputs and many digital inputs. These loggers read & store analog & digital data in engineering units from just about any electrical sensor or analog instrument. Thermocouples, transistor temperature sensors, RTDs, strain gauges, current loop outputs from other instruments, voltages, currents, resistance, frequency, period, digital state, pulses etc. For AC power measurements you can connect a Modbus power meter such as Dent PowerScout.

The loggers are easily set up for basic data logging jobs using the dEX graphical browser based interface. However if you have a special requirement, for example to start logging when an event happens, you can program the logger using its extensive scripting language to do almost any task. Not confident about programming? Ask ESIS’ engineers to do it for you – we have experience programming DataTakers for a wide range of tasks.

See DataTaker Data Loggers (this site, opens in a new tab)

ACR PowerWatch Voltage Disturbance Recorder

ACR PowerWatchDo you have equipment failing repeatedly or behaving strangely? Expensive out of warranty repairs due to voltage surges? Get to the root of the problem by measuring your incoming mains voltage and recording every surge, sag, spike and dip that happens.

PowerWatch 220/240V is the easiest way to monitor and record critical voltage disturbance information from any 220/240 volt Australian power outlet. Just set up your pre-determined voltage threshold values, or use the industry standard default values, and plug it in to a GPO power point. No wiring or dangerous connections required.

The data you record with the PowerWatch can be easily presented to your electricity authority or building manager, for discussion and complaints about power quality.


  • Troubleshooting repeated equipment failures
  • Medical and scientific equipment
  • Point-of-sale terminals
  • Computers
  • Other sensitive electronic equipment


PWV-002-A PowerWatch Power Quality Analyzer/Event Recorder (220 Volt, Australian plug style): $968+GST

See ACR PowerWatch Voltage Disturbance Recorder (this site, opens in a new tab)

ACR SmartReader Plus 9 Pulse Data Logger

SmartReader Plus 9The SmartReader Plus 9 is a versatile data logger designed for easy counting and recording of switch contact closures and voltage pulses. It has two pulse/contact channels. Durability is assured with a 3-year logger warranty and 10-year battery life.

While not strictly an “event” logger, this device counts pulses in each time interval and records the pulse counts. It’s mainly designed to connect to things like water and gas meters, but it can be used for any application where you need to know how many times a pulse or switch type event happened in each time interval.


Monitoring fluid (eg. water meters) and air flow, energy consumption from power meter pulse outputs, wind speed, shaft RPM, and rainfall (from tipping bucket sensors), etc.

SRP-009-128K SmartReader Plus 9, Pulse Data logger with 2 inputs: $1155+GST

See ACR SmartReader Plus 9 Pulse Data Logger (this site, opens in a new tab)

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