Mobeye ThermoGuard TwinLog CML4255 Temperature Alarm

Brand: Mobeye

 375,00 ( 309,92 excl. VAT)

In stock.

The Mobeye Thermoguard TwinLog CML4255 is a complete and user friendly temperature monitor with alarm and log functions. For reliable monitoring of the ambient temperature. The built-in communication module can connect to the 4G LTE-M and the 2G network.

  • Communication module: 4G LTE-M, 2G Fallback
  • Inputs: 2x digital temperature input, 2x NO/NC inputs
  • Outputs: 1x open collector (200mA)
  • Temperature range: -10 to +50 degrees Celsius (ambient temperature), -35 to +70 degrees Celsius (sensor)
  • Power input: battery-operated (with option to connect 12VDC power source)
  • Batteries: 2x CR123 (lithium 3,0V) included
  • Dimensions: 94 x 94 x 28 mm

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Mobeye ThermoGuard TwinLog CML4255 Temperature Alarm

The Mobeye ThermoGuard TwinLog CML4255 is an extremely accurate and user-friendly temperature monitor. As soon as the temperature deviates from the set limit values, you will receive an alarm message. In addition, it logs the temperature values at a self-selected interval and displays them in the online portal. The CML4255 has a reliable temperature sensor, with the option for a second one. The device is fully battery powered, or uses external power. The built-in communication module can connect to the 4G LTE-M and the 2G network.

CML4255 in Mobeye Internet Portal
Mobeye Web App

The CML4255 measures, monitors and logs temperature values. If the temperature or one of the inputs indicate an alarm status, the CML4255 notifies you by app (IOS/Android), telephone call (voice message), text message and/or e-mail. The contact persons can be set, with multiple options for the alarm message.

The log functionality is available when using the Mobeye Internet Portal. The logged temperature values are sent to the portal periodically and after an alarm, for display in table and graph form.

The Mobeye ThermoGuard TwinLog CML4255 runs for more than a year on a set of batteries. When using an external power source (12-24V DC or mains), it also sends “power failure” notifications.

Temperature sensor

The temperature sensor is digital and extremely accurate. The minimum and/or maximum temperature limit is adjustable between -35 °C and +70 °C. The sensor is factory calibrated and indicates the value in decimals. The interval for logging the values and transferring them to the portal is adjustable.

One sensor is included in the standard product. A second sensor can be connected, which is available as an optional accessory.

Alarm messages

In the event of an an alarm, the Mobeye ThermoGuard TwinLog sends alarm notifications by app (IOS/Android), telephone call (voice message), text message and/or e-mail. The message includes the actual temperature.

For the push messages there is a choice between an escalation plan or a group message. The escalation plan allows the recipient to acknowledge the push message, so that the other contacts no longer receive the message. If none of the recipients acknowledges the push message, a call is made. The number of contacts is unlimited.

CML4255: External voltage vs battery powered

The Mobeye ThermoGuard TwinLog can run on batteries for a long time and is therefore independent of an external power source. If an external power source is available, it is recommended to connect it. The availability of the power supply is then monitored. It will also send power failure alarms. In the event of a malfunction, a message will be sent. The batteries take over and the CML4255 continues to monitor and send alarm messages. A notification will be sent once power is restored.

Batteries are included. A country-specific mains adapter is available as accessory.

Alarm inputs, piezo siren and open collector output

In addition to the temperature sensor, the Mobeye ThermoGuard TwinLog CML4255 has two NO/NC inputs for connecting alarm contacts and sensors. These can be used to monitor the status of a make/break sensor or device, such as an air conditioner or door magnet. In the event of an alarm, an audible alarm indication may be triggered by the internal piezo siren. In addition, there is an (open collector) output to switch an external device.

How it Works

Mobeye CML4255 how it worksThe Mobeye CML4255 continuously measures the temperature values and logs them periodically. This way you are fully aware of alarm situations and the complete temperature trend.

  1. Place the sensor in a place with a stable temperature, not too close to the heat sink or heat source.
  2. Set the temperature limits and log frequency and choose contacts for the notifications.
  3. If it gets too cold or too hot, the ThermoGuard TwinLog sends alarm messages to the contacts. The logged values can be viewed online in table and graph form.

Typical Applications for the Mobeye ThermoGuard Twinlog CML4255

The instant alarm, periodic logging and remote insight make the CML4255 suitable for professional applications such as

  • Food chains
  • Drug monitoring
  • Conditioned storage
  • Medical fridges and freezers
  • Cold storage
  • Powder storage
  • Dyeing and drying
  • ICT server rooms
  • Animal shelter

For use in wet or damp areas, outdoor use or industrial use, choose the Mobeye CML4275.


CML4255 – Technical data


  • CML4255
  • 1x digital temperature sensor
  • 2x CR123 batteries
  • SIM card

(Alarm) messages

  • temperature alarm, input alarm, power failure, alarm recovery, battery low voltage, (missed) test report
  • to private contacts via app, call, text message and/or e-mail
  • local piezo siren


  • temperature value
  • status
  • setting list
  • event history
  • network strength
  • position based on Cell ID

Setting options

  • temperature limits per sensor (between -35 °C and +70 °C)
  • log interval (in min.)
  • interval for data synchronisation (in hours)
  • contact persons (unlimited number) for alarm and service messages
  • message texts
  • repeat cycles
  • input type
  • recovery messages
  • alarm delay times
  • test interval (keep-alive)
  • etc.


  • arming and disarming via button, time schedules and SMS

Temperature sensor

  • 1 meter cable
  • accuracy: 0.5°C between -30 °C and +55 °C, 1 °C outside these limits


  • 2x digital temperature input
  • 2x NO/NC input (potential-free)
  • 1x 12-24V DC (+/- 2V)


  • open collector (at external voltage), max. 200mA. Switches in the event of an alarm or after incoming SMS/call

Power supply

  • 2x CR123 lithium batteries or 12-24V DC (regulated) + 2x CR123 lithium

Battery lifetime

  •  > 1 year at normal use (battery operated)
  • > 3 years at normal use (powered externally)


  • 94 x 94 x 28 mm


  • 4G LTE-M (worldwide) + 2G EGSM Quad band

The Mobeye SIM card and Internet Portal provide full functionality and optimum security. The 4G LTE-M network is very reliable and ensures a strong penetration against low energy consumption. 2G is available as a fallback.

  • 2G EGSM Quad band (850/900/1800/1900 MHz)

When using your own SIM card, the device works (only) on 2G. The operation is “stand-alone”, without using the Mobeye Portal and without the log function. The alarm notifications are sent via SMS and telephone call to (max.) 5 contacts. Programming is done via (simple) SMS commands.

Accessories (not included)

  • 2nd temperature sensor (1m or 10m cable)
  • extension cable (3m, 10m or flat 1m cable)
  • mains adapter
  • external antenna

Mobeye SIM, Portal & App service

The Mobeye Internet Portal offers a clear dashboard and essential functions, such as graphs and log values, history, status and position (Cell-Id), online programming, setting up the messages and push notifications per app. The ‘keep–alive’ monitor offers extra security by monitoring the receipt of test messages. You can activate the supplied Mobeye SIM card online.


Click to open the documents and find more information:

SIM, Portal & App

Every Mobeye monitoring device requires a SIM card for communication. The product comes with a SIM card that can be used for a low cost and immediately provides access to the Mobeye Internet portal. Alternatively, use your own SIM card.

The Mobeye M2M SIM card gives the device full functionality, including the use of the Mobeye Internet Portal and App.

With the Mobeye SIM card, communication takes place over the 4G LTE-M network with 2G as fallback. When you insert your own SIM card, the device uses the 2G network. Alarm messages are then sent via SMS and/or call to max. 5 telephone numbers.

The Mobeye SIM card is PIN protected and only works in a Mobeye device. Please do not put it in another device. For more information about the Mobeye SIM card, see: The rate for the use of the Mobeye Internet Portal and the SIM card you will find here.

Free app for your smartphone
The Mobeye Messages app is available for download from the Google Play and Apple App Stores.

Do you want to use the Mobeye SIM card but it was not included in your package? Ask the MobeyeStore team to supply one by filling out the contact form!

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