SMARTlogger TOU (Time of Use) Data Loggers

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.

On this page:

On related pages:

Prices do not include GST and may change without notice.

SMARTlogger Time-of-Use Monitors

SMARlogger TOU loggersDent 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

See below for more Technical Tips on these loggers

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.


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

Fibre Optic Attachment for LIGHTINGloggerWhat 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)

CT Time-Of-Use Monitor and Data Logger

  • Monitors and Records Motor or Electric Loads with External CT
  • 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-CT  Dent Instruments Smartlogger Time-Of-Use logger with 0-150A Current Transformer:  $435+GST    8/15
    Requires software and cable for initial setup and data download (see below)


SMARTware Software for TOU SMARTloggers

All 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 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 TOU On symbol shows in the display.

Tech Tip: When monitoring devices that have power cords, use a short extension cord where the individual wires have been separated to clamp the CT around just one. Exercise extreme care that none of the insulation around any of the wires is cut or otherwise exposes a bare wire.

Note: You cannot place the current transformer around both wires of different phases (on appliances with two-conductor power cords, for example). To monitor equipment with two conductor power cords, separate the wires so that the current transformer is placed around only one wire.
Either the "hot" lead or the neutral wire will work.

4. 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 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.
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.


Computer Products

Communication Products

Measurement Products

Lab Products


Contact us for more info:

Phone: +61 2 9481 7420

Email: (JavaScript required)