Tekelek Ultrasonic 4G NB-IoT/CAT-M1 Sensor

SIM Card and Configuration

The Ultrasonic 4G NB-IoT/CAT-M1 sensor works in conjunction with a remote server. Before installation, the unit must be fitted with a suitable SIM card and be correctly configured for the location in which it is intended to operate. *Use only for intended purposes. Do not alter or modify the equipment.

Step 1: Activation

To activate the sensor, hold the supplied magnet to the hot spot, which can be found directly below the LED.

As the magnet is held to the hot spot, the LED will first flash Green, then flash Red. After this, the Red LED will light continuously. Remove the magnet from the hot spot once this has been achieved.

A series of beeps will be heard while this Red LED remains illuminated. This indicates the IoT Modem is registering onto the cellular network.

Upon successful registration to the network, the sensor will attempt to initiate a GPRS connection to the server. This is indicated by higher-pitched beeping and the LED illuminated RED.

The successful connection to the server is indicated by High/Low/high tone beeps as data is exchanged with the remote server, and a join request is processed. If all is well, the server will send an Activation command.

Successful activation is indicated by the LED turning green and a double beep pattern.

The Ultrasonic 4G NB-IoT/CAT-M1 sensor will now begin measuring the tank liquid level and uploading the reading according to the pre-programmed schedule.

If the sensor is installed according to Waveguide mode, then the Server administrator must be informed to change the setting to suit that mode.

It is recommended to contact the server administrator to verify that the sensor readings are received on the server and that the readings are good before leaving the installation site.

LED Patterns and Functions

Beep Patterns and Definitions

Image Description: The Tekelek Ultrasonic 4G NB-IoT/CAT-M1 sensor is a compact, cylindrical device designed for tank level monitoring.

Diagram Description: Activation involves holding a magnet near the sensor's LED. The LED sequence (Green flash, Red flash, continuous Red) indicates the registration process. Beeps provide audible feedback on network status and data transfer.

Step 2: Installation

The Ultrasonic NB-IoT/CAT-M1 sensor works in conjunction with a remote server. Before installation, the unit must first be registered to this server. Access to the backend server is required to verify that the unit has correctly joined the network.

The following outlines the sensor mounting options:

• The sensor must be positioned vertically on top of the tank, ensuring a clear path to the tank contents. Position it so that there are no internal obstructions that may interfere with the ultrasonic signal.
• If obstacles cannot be avoided, then a waveguide may be required. Please refer to Appendix 2 for further details.
• Locate a suitably positioned threaded opening on the top of the tank to hold the sensor.
• The sensor will fit directly into threaded 1 ¼", 1 ½", or 2" BSP (British Standard Pipe) existing tank connections.
• Ensure that the gasket is placed correctly, and that the sensor is screwed in properly to the tank.
• For tanks that do not contain a suitably positioned threaded opening on the top of the tank to hold the sensor, please refer to Appendix 1.

Diagram Description: Mounting considerations include avoiding internal tank obstructions (e.g., tubes, rough edges) that can block the ultrasonic signal. The sensor should be mounted as vertically as possible. A waveguide may be necessary if obstructions are present.

Appendix 1: Drilling Procedure

This appendix details the process for tanks without pre-existing threaded openings.

• Choose a flat spot on the top of the tank.
• Use a 45.5mm tapping drill to drill a 1 ½" BSP hole on the surface of the tank.
• Place the foam gasket over the hole, followed by the mounting adaptor.
• Tighten the adaptor onto the tank using two stainless steel self-tapping, counter-sunk screws (supplied). Do not over-tighten.
• Screw the sensor into the adaptor. Ensure that the sensor is vertical on the tank and screwed correctly into the base, and that the threads have not crossed, to give a secure seal.

Image Description: Components for tank mounting include a rubber seal, a mounting adaptor, and the sensor. A gasket is placed between the adaptor and the tank surface to ensure a seal.

Appendix 2: Waveguide

Note: The default sensor configuration is non-waveguide mode. Measurements will be inaccurate unless a waveguide configuration mode is used.

• Source a suitable pipe to act as the waveguide. This pipe should conform to the dimensions shown in the figure below to fit the sensor. The recommended pipe material is PVC (domestic waste pipe is often used). Other materials are possible but should be checked for chemical resistance to fuel oil.
• The pipe should be cleanly cut to length. The required length should be measured from the top of the tank (where the sensor is to be mounted) to that of the fuel outlet point.
• The bottom of the pipe should be a minimum of 5cm from the base (floor) of the tank to prevent it from touching in the case of tank dimensional changes due to temperature etc.
• The waveguide pipe should be securely attached via the two grub screws and hand-tightened with an M1.5 Allen key (Note: over-tightening the grub screws can damage the plastic). Care should be taken to keep the sensor and pipe vertically aligned and supported while fitting during the installation.
• Depending on the weight, length, and surface finish of the pipe, it may be necessary to glue it into position. In this case, a hole should be drilled near the top of the waveguide pipe, just below the adaptor, to ensure that any trapped air can exit.
• Insert the correctly sized rubber seal ring, as required for the tank opening (supplied), and position it on the face of the adaptor that is screwed onto the top of the tank.
• Insert the whole assembly carefully into the tank, taking care not to loosen the pipe, and fit into position. Hand-tighten the assembly until the rubber seal locks into position.

Diagram Description: The waveguide pipe assembly requires a pipe with specific dimensions: maximum outer diameter of 36mm, minimum outer diameter of 34mm, and a nominal inner pipe diameter of 32mm (1.25 inch), with a minimum inner diameter of 31mm. An air escape vent hole of 2mm diameter should be present near the top. The pipe is secured using grub screws.