Measuring device - Watchman® Sonic Plus Advanced

Wireless measurement of liquids and leakage monitoring

On stock 2 years

in stock In stock

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€104.57 ex VAT (€128.62 inc VAT)
€139.43 ex VAT (€171.49 inc VAT)
Current price is the lowest gross price from the last 30 days

Measuring device - Watchman® Sonic Plus Advanced

Protect your fluid! With the Watchman Sonic Advanced Plus, you can monitor the contents of the tank without having to go outside to the tank. In the event that the oil level in the tank drops abnormally, the receiver will emit an audible alarm.

How it's working
The transducer sits on top of the tank and uses ultrasonic level measurement techniques to continuously measure the oil level in the tank. It then transmits this information to a receiver that plugs into a wall outlet conveniently located in your home. The liquid height is displayed on the LCD screen of the receiver. The host can monitor the oil level in his tank from inside the house. When the oil level in the tank drops below 10%, the fuel pump symbol appears to indicate the need to order. Upgrade to an intelligent monitoring system using a USB receiver.
This allows you to turn your Watchman Sonic Plus Advanced into a smart Wi-Fi tank level monitor. It allows you to control the oil level using a smartphone application without being tied to one place.
The SENSiT USB receiver and app alerts you to low levels, dips, predicted exhaustion, and monitors usage right to your phone. SENSiT even works with Alexa, so when asked "How much fuel is in my tank?", it can let you know!

Product features:

  • quick and easy to install
  • suitable for steel or plastic tanks
  • 200 meters range of the transmitter to the receiver
  • measurement of tanks up to 3 meters high
  • audible alarm when oil level is over
  • sudden fall alarm (ON/OFF)
  • waveguide mode (ON/OFF)
  • unique serial number
  • works with the USB receiver to form the Watchman Sonic Advanced smart monitoring system
  • leakage monitoring in double-walled tanks/sumps

Technical parameters

Tank depth measurement:

  • minimum depth: 0.5 m
  • maximum depth: 3 m


Bar level indicator, each bar corresponds to 10% of the tank height. An early warning indicator (flashing tank fill indicator) at a certain height above the bottom of the tank. Flashing red tank empty LED at a certain height above the bottom of the tank.

Communication range:

  • 200 m under normal 'line visibility' conditions.
  • the actual operating range of the device may be influenced by external factors that reduce the range of the transmitter or the sensitivity of the receiver

Power supply:

  • receiver: 230 V, 50–60 Hz +/- 10%.
  • transmitter: 3 volt lithium cell.

Battery life:

Up to 3 years (depending on the height of the tank and the frequency of filling / emptying it).

Wireless connectivity:

433 MHz. FM modulated signal transmission. EN 300-220


  • receiver: 50 x 55 x 35 mm (without antenna).
  • transmitter: 70 x 93 mm.

Max. And min. operating temperature (transmitter):

  • working temperature range from –10 to + 50ºC.
  • working humidity: 0-100%. Hermetically sealed device made of UV stabilized PP3317 material.

Tank Mounting Hole Size:

  • 32 mm opening
  • connector with male BSP 2 "thread


The warranty is subject to the product being used in accordance with the manufacturer’s instructions.
The dimensions given are approximate. The differences result from the production technology and method of use of the product.


Most accessories will be delivered within 1-3 working days. Deliveries are made to parcel machines or to a designated address specified by the Customer.
In the event of non-availability of the Goods, the Shop will inform the Customer of the expected delivery time and, in the case of paid orders, the Customer has the option to cancel the order with a full refund.
For more information on delivery, see the "Delivery and Returns" tab:


Measuring device - Watchman® Sonic Plus Advanced Specification

  • Product Code: 1008340
  • Availability: On stock
  • Warranty: 2 years
  • Weight: 0.5kg


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