Level Sensors

A level sensor is a device that measures, monitors, and maintains liquid (and occasionally solid) levels. After sensing the liquid level, the sensor converts the observed data into an electric signal. Level sensors are widely used in the industrial and automotive industries but may also be found in various consumer items, including refrigerator ice makers.


Types of Level Sensors


There are two kinds of level sensors: point level sensors and continuous level sensors. Point level sensors assess whether a liquid in a container has reached a predefined point. In contrast, continuous level sensors are employed to compute precise liquid levels. Level sensors are further classified as invasive or non-contact. Invasive sensors make direct contact with the substance being measured, while non-contact sensors use sound or microwaves.

1. Point Level Sensors

There are several types of point level sensors, but they are all invasive. The "float switch" is a basic kind of point level sensor. As the volume of liquid in a container changes, it forces the switch to open or close a circuit. An infrared (IR) emitter and a photodiode are utilised in optical level sensors. As photoelectric proximity sensors, they detect the presence of liquid by measuring the amount of infrared light reflected back into the photodiode. Capacitance level sensors analyse variations in capacitance to determine liquid levels in tanks (the capacity to store electric charge). "Tuning fork" sensors use pressure and vibration fluctuations to detect liquid level.

2. Continuous Level Sensors

Unlike point level sensors, continuous level sensors are non-contact (ultrasonic and microwave). Ultrasonic level sensors emit sound waves, while "radar" sensors emit microwaves. The liquid level determines the time lag between wave emission and reflection.


PVL Level Sensors


Pressure Vacuum Level Ltd has been selling high-quality level sensors for over 28 years. PVL provides these devices for various industries.

Don't hesitate to contact us if you have any questions about our level sensors or other products.


Other Products


PVL customers can rely on us for high-quality products. Level Sensors are only a handful of the products we provide customers across the United Kingdom. We are also a significant supplier of Pressure Switches and Transducers.



  • Oil & water sensing options
  • Over-pressures up to 300 bar
  • Max working pressures up to 25 bar
  • 9 - 36Vdc supply range
  • Choice of Threads
  • IP67 Protection
  • LED with Modifiable Display Units
  • Current, Voltage or Modbus Outputs
  • D Logic Signal Processing
  • Various Threads and Flange Options
  • Up to 20M Measurement Range
  • ATEX options available
  • Non Contact Level Measurement
  • Current, Voltage or Modbus Outputs
  • Easy Adjustment and Setup
  • Various Threads and Flange Options
  • Up to 20M Measurement Range
  • ATEX options available
  • Highly accurate and precise
  • 2 Wire 4-20mA output
  • 200mm to 6000mm length options
  • Shock and vibration proof
  • Maintenance free
  • ATEX options available
  • For continuous level measurement of clean, lightly soiled water
  • Precise measurement range up to 100 m (H2O)
  • The health certificate for contact with potable water available
  • Current or Voltage output
  • Easy "plug and play" installation without any settings
  • Level detector and transducer
  • Ideal for polluitng liquids
  • No moving parts
  • Maintenance free
  • 100mm to 3000mm length options
  • 3⁄4“ BSP thread (others available)
  • Use: Water - Mineral oils - Diesel fuel - Petrol
  • Fixing: 1" gas AISI 304 (stainless steel on request)
  • Output signals: 4-20 mA ANALOG
  • 4 to 20mA or 0-10V Output
  • 0.5 % Accuracy
  • Immersion Depth Up to 100m
  • 10cm Step Configurations
  • Fully Stainless Steel
  • Over Voltage Protection
  • Direct tank mounting with flange
  • Electrode length from 0.1 m to 1 m
  • 4-20 mA or 0-10 V output
  • Easy Install with no settings required
  • IP68 rating
  • Housing & rod stainless steel
  • Bluetooth Connectivity
  • Excellent reliability and Accuracy
  • Not affected by vapor or Outggasing
  • PTFE Teflon® Transducer NEMA 4X  
  • IP68 Protection RS-485 Communication
  • 4-20mA
  • Limit Level Sensor for Viscous Liquids
  • Resistant to Adhesion of Sticky Media
  • Conductive / Non-Conductive Fluids
  • 1/2” BSP thread
  • Media Recognition Settings
  • Highly Sensitive and Reliable
  • Connection:Cable gland or conduit
  • Voltage:Ex ia 12 to 30 VDCi Ex d 12 to 50 VDC
  • Temperature:up to + 450 °C
  • Pressure:-1 bar to + 120 bar
  • Approval:Ex-Zone 0 (ATEX, IECEx)
  • Equipment Type: Vapor recovery monitoring
  • Liquid: Petrol
  • Certification: ATEX
  • Equipment Type: Overfill prevention
  • Liquid: Diesel / Heating Oil
  • Vessel: Oil Separator
  • Certification: None
  • Equipment Type: Overfill prevention
  • Liquid: Diesel / Heating Oil, Petrol
  • Vessel: Underground Storage Tank, Overground Storage Tank
  • Certification: ATEX, IECEx
  • Equipment Type: Overfill prevention
  • Liquid: Diesel / Heating Oil, Petrol, LPG, LNG, Oil
  • Vessel: Underground Storage Tank, Overground Storage Tank, Bulk Tank
  • Certification: None
  • Certification: None, ATEX, IECEx, Ex i
  • Signal output: Modbus ASCII (RS485), Relay, Veeder Root Protocol, H protocol, FAFNIR Protocol, Web Access
  • Power Supply: 110 VAC, 230 VAC
  • Equipment Type: Leak prevention system
  • Liquid: Diesel / Heating Oil, Petrol, Oil
  • Vessel: Tank Interstitial, Double Walled Pipes
  • Temperature: -20.00 °C up to 60.00 °C
  • Certification: None, ATEX, IECEx, Ex i
  • Signal output: FAFNIR Protocol
  • Additional criteria: Offers extra-high accuracy
  • Operating temperature (-5°C to +45°C)
  • Storage temperature (-25°C to +50°C)
  • Protection degree IP20
  • Kit weight 270 g
  • Dimensions of ABS crate 112x62x32mm WxHxD
  • Top Entry
  • Materials combination may be selected
  • Reed switch chain
  • Suitable medium temperature -20..+105ºC
  • Stainless Steel or Brass
  • 4-20ma or 0-10v
  • For water, mineral, oils, diesel & petrol
  • 4-20mA analogue
  • Built in temperature sensor
  • IO-Link Communication System
  • 4 setting points
  • New illuminated differential indicator
  • High long-term stability  
  • Accuracy 0,5% within the total range  
  • Measuring range up to 100 m (H2O)  
  • Thread process connection
  • Current or voltage output  
  • LED indicators
  • Precise customer choice of the measurement range up to 100 m (H2O)
  • Current or Voltage output
  • Easy “plug and play” installation without any settings
  • Radar level meter with guided wave
  • 4 ... 20 mA, HART® output
  • Liquid, mush & bulk-solid materials
  • Suitable with aggressive liquids
  • Measuring range up to 40m
  • ATEX options available
  • Level Sensor with Reed chain
  • Analogue output/switching output
  • 250mm to 2000mm length options Very simple installation
  • Various materials available
  • Optional temperature sensor
  • For continuous level measurement of liquids or bulk solids
  • Wide spectrum of use, direct mounting into tanks, vessels, sumps or silos and hoppers
  • Setting using a magnetic pen without the need for complete emptying of the tank
  • Possibility of linear measurement even in non-conductive or variously shaped vessels
  • Optical indication of function and status of level meter by two LEDs
  • Wide selection of electrical connection: connector or cable glands
  • Housing, electrodes and reference tubes made from stainless steel
  • Variants with coated electrode for aggressive or electrically conductive media
  • For continuous level measurement of liquids and bulk solids
  • Wide range of applications
  • Real-time data measurement
  • 4-20mA analogue output
  • Two-way HART Communication
  • For continuous level measurement of liquid and bulk-solid materials
  • Direct mounting into containers, silos, vessels,basins, reservoirs, etc
  • Variants with rope electrode or with coated electrode for aggressive and electrically conductive medium
  • Possibility of linear measurements even in nonconductive and differently shaped vessels
  • Variants for usage in explosive areas, high temperature performance
  • Current (4 ... 20 mA) or voltage (0 ... 10 V) output
  • Operation mode: by rotation
  • Important specification: ATEX Only in non ATEX area
  • Measuring blade speed: 5 rpm
  • Electric characteristics: 230 VCA 50/60 Hz Option :24VCA/VDC
  • Cut-out power: 2A
  • Maximum temperature: -20 - + 60°C
  • Protection index: IP 65 - 53
  • Vanes: Inoxidable AISI 304 o 316
  • Body: Glass fiber reinforced ABS
  • Float weight without cable: 800 g
  • Measuring range 100 mbar to 10 bar
  • Immersion depth: max. 100 m
  • Analog output 4..20 mA
  • For drinking-, process-water, oil
  • Process temperature -10..+60 °C
  • Protection class IP68, depth of immersion max. 100 m