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Delta T Alert

24x7 Online Monitoring of Your Electrical Assets

Delta T Alert™ is a wireless, self-contained temperature-monitoring system with sensors that attach to your electrical enclosures. The units monitor the delta between your internal and external enclosure temperatures. The data is wirelessly transmitted for analysis, trending and can even remotely alarm your support teams with the details and location of the temperature alarm.

industrial challenges

The Challenge

A Snapshot in Time

The average electrical system is only inspected for a total of 3 minutes per year. Considering that there are 525,949 minutes in a year, this means on average electrical systems are inspected for less than 1% of their annual run time.

Most companies embrace the use of condition based maintenance (CBM) technologies such as infrared thermography to inspect their electrical systems. However due to the high cost of staff time and limited budgets, a planned maintenance program is typically employed where inspections are only conducted a few times per year. While these inspections can be valuable in helping to prevent unexpected failures, they only provide a single ´snapshot in time´ leaving the subject systems unmonitored for the balance of the year.

The Answer

The Delta T Alert™ system complements your existing electrical maintenance programs and bridges the gap between your annual scheduled inspections by monitoring, tracking and reporting critical temperatures within your electrical enclosures on a daily basis.

Meet the Delta T

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Delta T Alert™ is a wireless, self-contained temperature-monitoring sensor that attaches to an electrical enclosure cover. The patented unit comprises of two temperature sensors – one to monitor the electrical enclosure´s interior temperature and the second to monitor the room´s ambient temperature where the enclosure is located.

Key Features

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wireless feature

Battery Operated

The Delta T Alert™ sensors run on three AA batteries thus eliminating the need to run electrical power to all the units. The average battery life is 18-24 months, and can be extended up to 36 months depending on your settings and environmental conditions.


The Delta T Alert™ system uses Z-WaveTM technology to wirelessly connect multiple sensors to each controller thus eliminating the need to run network cabling.

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Easy to Install

The Delta T Alert™ sensors are small so they can be fitted nearly anywhere and contain an internal magnet that help it easily attach to the metal enclosure (although it is recommended to use the included mounting bolts).

Emergency Alarm Notifications

The Delta T Alert™ system will alert you when your predetermined temperature threshold is breached.


Environmentally sealed (optional):

The environmentally sealed version of the Delta T Alert™ sensors can be installed outside.



The Delta T Alert™ system keeps track of all historical temperature data making it easy for you to build reports and conduct trending analysis.



You can program your Delta T Alert™ system to automatically take up to eight scheduled temperature readings per day.


Temperature Sensors:

The patented Delta T Alert™ sensors comprise of two temperature sensors – one to monitor the electrical enclosure´s interior temperatures and the second to monitor the room´s ambient temperature where the enclosure is located.



The Delta T Alert™ sensors and controllers come pre-loaded with the necessary software. Additionally, the controllers are also shipped with a copy of the license-free dashboard software that is easily installed on your local computer (or server). Once the dashboard software is installed and the sensors are turned on, you can easily configure and program them to your desired specifications from your dashboard. The system keeps track of all your data reported and makes this data available in easy to use reporting software. You can compare the temperature data from similar devices, look that the historical readings from a particular device, or even create a trend analysis to track the changes in temperature over time.

How it Works

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Constant Delta Temperature Monitoring

Delta T Alert™ sensors monitor the interior temperature of your electrical enclosure as well as ambient room temperature where the enclosure is located.


Data Transmission

The Delta T Alert™ sensors are wirelessly networked to the controller which is connected to your network. The system monitors the temperate readings from the sensors and the health of the sensors themselves to include their battery level as well as reporting back if a sensor is unresponsive.

Information Recieved

The Delta T Alert™ software then receives the data from the controller, stores the collected information on a local machine, and makes the information available via the dashboard.


Emergency Alarm Notifications

When your predetermined temperature threshold is breached, the Delta T Alert™ system will alert you with the details and location of the alarm in three separate ways:

  • Audio: the sensor itself will provide an audio alarm
  • Visual: the system dashboard will provide a visual alert
  • Email: the system can be programed to send an email alert to your designated support team members
  • emergency notification


    delta t classic

    Delta T Classic


    delta t standard

    Delta T Alert

    delta t environmental

    Delta T Alert Env

    Feature Delta T Classic Delta T Delta T Env
    Outdoor Usage No No Yes
    Wireless Technology Z-Wave™ 3rd Gen Z-Wave™ 5th Gen Z-Wave™ 5th Gen
    RF Range (Point to Point) Up to 250 feet Up to 300 feet Up to 300 feet
    Back up Channel No Yes Yes
    Mesh Network Yes Yes Yes
    Battery Operated Yes Yes Yes
    Battery Life 12-18 Months 18-24 Months 18-24 Months
    Real Time Clock No Yes Yes
    Over the Air Updates No Yes Yes
    Compatible with Delta T Alert
    Monitoring Software
    Yes Yes Yes
    Audible Alarm No Yes Yes
    Daily Scheduled Reports Up to 8 Up to 8 Up to 8
    On Demand Status Report Yes Yes Yes
    LED Indicator Green, Red Green, Red, Yellow Green, Red, Yellow
    Ambient Operating Temperature -15°C to +85°C
    5°F to +185°F
    -40°C to +85°C
    -40°F to +185°F
    -40°C to +85°C
    -40°F to +185°F
    Temperature Reading Accuracy +/- 0.5°C +/- 0.5°C +/- 0.5°C
    Available Regions* NA NA, EU, AS NA, EU, AS

    ∗ Devices only compatible in one selected region of choice upon purchase.

    Frequency 908.42MHz 868MHz 921.4MHz
    Region Americas EMEA, Brazil APAC

    Minimum System Requirements



    Processor speed 500 MHz 1 GHz
    RAM 1 GB 2 GB
    Free hard disk space 5 GB 10 GB
    Display resolution 800 x 600 800 x 600 or higher

    Operating System: Windows XP or Newer


    bob delorenzo

    Bob DeLorenzo

    Chief Engineer

    Delta T Alert™ warned me of a load imbalance coupled with phase "B" drawing greater than 80% of rated load on a main service switch which feeds my A/C related equipment. During our annual infrared scan, thermography results showed a number three priority on this main switch. However, during the high load/high heat of the summer months, Delta T Alert recorded critical alarms on the same switch. The unbalanced load and amperage greater than 80% of rated load on phase "B" were realized after a Dranetz Meter Model 4400 was installed for a period of one week. This condition is a little too close for comfort, therefore, this winter, I am changing my 30 year old motors to new energy efficient motors. The daily temperature monitoring of Delta T Alert proved to be a real wake-up call for me regarding this switch. Next year, I´m installing additional Delta T Alerts in my MER Rooms.

    mike hassett

    Mike Hassett

    Chief Engineer

    I have Delta T Alert™ units installed on my Main Switches and Current Transformers which are located in my Main Switchgear Room. I receive Delta T readings on a daily basis during my high load times of day. The software is very straight-forward and easy to navigate.

    gene budgell

    Gene Budgell

    Chief Engineer

    Delta T Alert™ notified me of two fused disconnects which were in alarm status. One disconnect was in "elevated" alarm status and the other was "critical" alarm status. The critical alarm status was a three-phase 200 amp fused disconnect where phase "C" was operating at 196 amps. This disconnect supplies electricity to a tenant´s restaurant and corrective action was taken prior to failure.

    aku laine

    Aku Laine

    Chief Engineer

    I´ve had over 80 Delta T Alert™ sensors installed since 2009. Since then, I´ve been alerted to "Elevated" and "Critical" alarms in my Main Switchgear Room, 2nd Floor, 24th Floor and 30th Floor Electrical Closets - all from my 2nd Floor office. By the end of the year, I plan on ordering another forty units for my Bus Duct Disconnects.

    john vasilakos

    John Vasilakos

    Chief Engineer

    I started out with 12 units last year. Delta T Alert™ has proved itself and I now have over 40 units installed within my Main Switchgear Room and Basement MER. Knowing the temperature rise within my critical electrical equipment on a daily basis gives me peace of mind, especially during the high load months.

    *Note: All testimonials pertain to the ´Classic´ Delta T Alert™ systems.

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    Delta T Alert™ is one of the many Electrical Maintenance Safety Devices (EMSD´s) offered by IRISS. Learn more about IRISS and our products, including the world's first and only industrial-grade infrared (IR) inspection windows.



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