FAQ Wireless Temperature Sensor 1NTR

Find below the most frequent questions asked about the wireless temperature measurement module 1NTR

Last Updated: September 08, 2020

Table of Content

Where can I use the wireless sensor 1NTR?

The 1NTR is a battery driven wireless sensor which is measuring and buffering temperature values. Since it is IP67 protected, it can be installed also in rough and humid environments. Typical areas of application include ambient room monitoring as well as fridges and freezers*. Wireless connection to an RBR nearby is indicated on the 1NTR (green LED "Link") and in detail on the ELPRO Cloud dashboard indicating the radio connection strength with bars (similar to a mobile phone).

Can I use the 1NTR to monitor a truck (RBR installed on the warehouse ramp)?

A realistic scenario for using the RBR & 1NTR on a truck could be:

  • Roundtrip: Truck is returning to the same ramp regularly (e.g. daily or weekly)
  • Intra-Company Logistics: Truck is moving inside a defined network

Communication bridge RBR is installed on the ramp (of each network station). 1NTR is placed on the trucks. No connection warning and missing value alarms are set to exceed the average trip lengths.
As soon as the truck comes back to the ramp, the sensor delivers all values. The ELPRO Cloud stores all values and performs the assessment. In case of a temperature deviation, an alarm message is issued. If you are looking for a solution working without a communication bridge, please refer to the LIBERO Gx project of ELPRO using the M1/NB1 standard network.

Can the 1NTR also connect through a second RBR?

The wireless sensors are not tied to one dedicated RBR. They can be in range of many RBR and decide automatically which one to use to deliver their values to the ELPRO Cloud software. Adding more RBR increases the probability that the measurement values are always delivered immediately (otherwise measurement values are buffered until the connection could be re-established).

What happens if during pairing the distance between 1NTR and RBR is too large?

During pairing there must be a strong wireless signal between an RBR and the 1NTR. Pairing might fail if the connection is not strong enough. In case of a failed pairing, you need to repeat registration of the sensor in the software (find out here how that works).

Note: After pairing, you are free to move the sensor to its final measurement location. On the software dashboard you can see if the wireless signal is still strong enough.

What happens if I miss the 10 minute window for pairing the Sensor 1NTR?

If you miss the 10 minute interval, you need to repeat the process of adding a Sensor in the software (find out here how that works).

What happens if there is no connection between the 1NTR and an RBR

If the connection between an RBR and the 1NTR is interrupted, the 1NTR tries to send the measurement values via another RBR in range (if available). If no RBR nearby can be found, the 1NTR keeps on buffering measurement values until an RBR in range is available to send the buffered values. The buffer has a size of 14800 measurement values, which means that the device can buffer measurements of more than 100 days, if it is configured in a 10 minutes logging interval.

What is the meaning of the LED's on the 1NTR?

On the wireless sensor 1NTR you find three LED’s:

  • Left LED "Link" (red): blinks after the batteries have been inserted and the pair button has been pressed for 3 seconds. Keeps on blinking during the pairing and connection process. If this LED blinks during regular operation, i.e. after successfully having paired the sensor, this indicates that the measurement module is not in reach of a communication module ECOLOG-PRO RBR. Reduce the distance between measurement and communication module.
  • Middle LED "Link" (green): blinks after the batteries have been inserted and the pair button has been pressed for 3 seconds (together with the left LED in red). As soon as the pairing was successful, it lights for 3 seconds and afterwards shows a short blink every 10 seconds. A green blink every 10 seconds is an indication for an established wireless connection between the 1NTR and the RBR. 
  • Right LED "Data" (green): blinks in a ten seconds interval if the measurement process has been started successfully, i.e. the sensor was configured in ELPRO Cloud and the module was paired successfully. 

What is the meaning of the red blinking LED on the wireless sensor 1NTR?

The left (red) LED "Link" on the 1NTR indicates a bad connection status. If it keeps on blinking red, it means that no connection between the 1NTR and an RBR is established - this might have various reasons:

  1. Your sensor has not been paired successfully, due to any of the following reasons:
    1. Your account has not been set-up (follow instruction Register ELPRO Cloud account”)
    2. Your RBR has not been installed and connected (follow instruction “Connect the communication module ECOLOG-PRO RBR")
    3. Your sensor has not been added in the Cloud software or has not been connected successfully (follow instruction “Add & connect a sensor”)
  2. The signal between the 1NTR and the RBR is disturbed. Please check for the following potential reasons:
    1. The distance between the 1NTR and the RBR might be too large and therefore the wireless signal not strong enough for sending the data.
    2. The RBR may be down or have lost connection to ELPRO Cloud (check the LEDs on your RBR).
    3. Physical goods might disturb the signal, e.g. big metal objects between the 1NTR and RBR.
    4. Other radio equipment may interfere with the radio signal of the 1NTR and RBR.

        How is the 1NTR powered? What type of batteries are used?

        By default, the ECOLOG-PRO 1NTR is powered by 2 AAA standard alkaline batteries. If you intend to use the device in a temperature range between -35 °C and -10 °C you need to source AAA LiFe batteries by yourself. You may order fitting batteries online, e.g. here.

        What happens if the batteries of an 1NTR are empty? Can I exchange the batteries?

        If the batteries of the 1NTR are weak, the system issues a low battery warning on the dashboard and sends out a low-battery message via email (and/or SMS), if configured. The batteries can be exchanged very easily by opening the back lid (screw open) of the 1NTR. In order not to lose measurement values, please exchange the batteries quickly. Please watch the video how to exchange the battery.

        What frequency is used for the wireless sensors?

        The wireless sensor 1NTR is communicating with the radio bridge RBR via a safe and encrypted protocol on the 868 MHz frequency band for the European market, and on 915 MHz for the US market.

        Is the wireless protocol registered in my country?

        At the moment, the wireless protocol for the communication between the RBR and the 1NTR is registered in the following countries:

        • Switzerland
        • All countries of the EU/EFTA
        • USA
        • Canada
        • All other countries accepting the EU accreditation or the US accreditation (FCC)

        We are working on further accreditations and will update this list continuously (last update: November 2019).

        If you don’t find your country on this list, please contact us by filing a ticket to let us know, which country you are waiting for.