How to Measure Tank and Reservoir Levels in South Africa with Float Pressure Ultrasonic and Radar Options
For most tanks and reservoirs, choose the level technology by asking one question first: do you need a simple on/off alarm, or a continuous level reading?
Use a float switch when you only need high-level, low-level or pump start-stop control. Use a hydrostatic submersible pressure sensor when the liquid is clean enough, the tank is vented, and you want a continuous level signal. Use ultrasonic when you want non-contact measurement in an open tank or reservoir with low foam and little vapour. Use radar when conditions are harder, such as condensation, vapour, temperature changes, dust or outdoor exposure. Use guided-wave radar for narrow vessels, foamy liquids, sumps or tanks with internal obstructions where a probe can be installed. Use visual methods such as sight glasses and dip tapes only where manual checking is acceptable.
That is the short answer. The better answer is that tank level measurement in South Africa must handle real local conditions: hot roofs, dusty yards, borehole reservoirs, chemical dosing tanks, irrigation dams, municipal pump stations, load-shedding recovery cycles, and operators who need simple, reliable information at 02:00 when a pump trips.
The right level device reduces overflow, dry running, pump cycling, chemical waste, product loss and call-outs. The wrong device can work well for a week, then fail because of foam, blocked impulse lines, condensation on a sensor face, changing liquid density or a float jammed with debris.
Start with the job the level instrument must do
Level measurement is not one job. It is several different jobs that often get mixed together.
A level device may need to:
Stop a tank from overflowing
Protect a pump from dry running
Start and stop transfer pumps
Show operators how much water, chemical or product remains
Send a continuous signal to a controller, telemetry unit or PLC
Trigger local alarms
Record consumption or usage patterns
Help plan deliveries, irrigation cycles or treatment processes
A simple tank level switch can do some of these jobs well. It can tell a pump to stop when a tank is full or start when a sump is high. It will not show whether the tank is 37% full or how quickly the level is dropping.
A continuous transmitter gives a changing signal. That signal can feed a display, PLC, VSD, remote telemetry unit or data logger. It can support trends, alarms, control logic and stock visibility.
Many sites need both. A continuous transmitter runs the process, while independent high-high and low-low switches act as backup protection.
The main level measurement options
Each technology measures level in a different way. That difference matters during installation, calibration and maintenance.
Float switches work best for simple alarms and pump control
A float switch moves with the liquid surface. When the level rises or falls to a set point, the float changes state and sends an electrical contact signal.
Common uses include:
High-level overflow alarm on a storage tank
Low-level pump protection in a borehole or day tank
Pump start and stop control in a sump
Backup alarm on a reservoir
Simple controls where no level display is needed
Float switches are popular because they are easy to understand. An electrician or maintenance technician can usually see what the float is meant to do. For agricultural reservoirs, small pump stations and holding tanks, that simplicity is a real advantage.
The main weakness is mechanical movement. Floats can foul, tangle, stick, corrode or get trapped against tank walls, ladders and pipework. In turbulent tanks, they may chatter. In dirty sumps, rags, sludge, algae or scale can stop free movement. In chemical tanks, the float material must suit the liquid.
Float switches are also point devices. They show that a set level has been reached. They do not give a full profile of the tank contents.
Best fit:
Clean to moderately dirty liquids
Open or vented tanks
Sumps and pump chambers
Simple high and low alarms
Sites where low cost and easy fault-finding matter more than continuous readings
Be careful with:
Thick sludge
Sticky liquids
Tanks with mixers or strong turbulence
Long cable floats near pipework
Liquids that attack the float or cable material
Hydrostatic pressure sensors measure the liquid head
A hydrostatic level sensor measures the pressure created by the height of liquid above the sensing point. In simple terms, deeper liquid creates more pressure. The transmitter converts that pressure into a level reading.
For water and many water-like liquids, this is a practical and reliable way to measure level. Submersible pressure sensors are often lowered into reservoirs, sumps, boreholes, tanks and wet wells. Side-mounted pressure transmitters are common on closed or open process vessels.
Hydrostatic measurement suits:
Clean water reservoirs
Borehole storage tanks
Municipal wet wells
Irrigation tanks
Effluent applications where the sensor is suitable
Tanks where foam makes surface measurement difficult
The key point is density. Pressure depends on liquid height and liquid density. If the liquid density changes, the level calculation changes. Water level is usually straightforward. A tank that alternates between different chemicals may need more care.
Vented tanks are easier. Closed, pressurised vessels need compensation for the vapour or gas pressure above the liquid. Without compensation, the transmitter may read the combined pressure of liquid head and vessel pressure, not true level.
Submersible sensors also need cable care. The cable is often the vent path for gauge pressure sensors. If moisture enters the vent tube, readings can drift. Cable glands, junction boxes and desiccant breathers deserve attention, especially in wet chambers and outdoor installations.
Best fit:
Continuous level in water and low-viscosity liquids
Deep reservoirs and sumps
Applications with foam on the surface
Sites where the sensor can be safely submerged or side-mounted
Be careful with:
Changing liquid density
Closed pressurised tanks
Sludge build-up over the sensing diaphragm
Damaged or flooded vent tubes
Lightning risk on long outdoor cable runs
Abrasive solids or heavy sediment
Ultrasonic sensors measure distance through air
Ultrasonic level measurement uses sound pulses. The sensor sends a pulse down to the liquid or solid surface and measures the time it takes to return. The instrument calculates the distance to the surface, then converts that distance into level.
Ultrasonic is non-contact, so nothing touches the liquid. That is useful for water reservoirs, chemical tanks, some open channels and storage vessels where corrosion or contamination is a concern.
It works well when the sensor has a clear line of sight to a reasonably calm surface.
Good uses include:
Treated water reservoirs
Raw water tanks
Chemical day tanks with low vapour
Open tanks where maintenance access is easy
Plastic or metal tanks with a suitable top mounting point
Non-contact measurement where hygiene or corrosion is a concern
The limitations are mostly about the air space between the sensor and the surface. Foam can absorb the sound pulse. Vapour can weaken or distort it. Heavy condensation on the sensor face can block the signal. Dust may cause false echoes. Strong turbulence can scatter the echo. Temperature changes affect the speed of sound, although many instruments compensate for this.
Ultrasonic sensors also need a clear measurement path. Internal ladders, bracing, inlet streams, agitators and tank walls can create unwanted echoes. The sensor must be aimed correctly and mounted away from fill points where splashing or turbulence is strongest.
Best fit:
Open or vented tanks
Clean liquids with stable surfaces
Non-contact water level measurement
Sites where top mounting is practical
Reservoirs with a clear, open measurement zone
Be careful with:
Foam, steam and vapour
Condensation on the transducer
Narrow tanks with close walls
Filling streams directly beneath the sensor
High dust environments
Strong wind across open reservoirs
Radar sensors handle tougher non-contact applications
Radar level measurement also measures distance, but it uses electromagnetic waves instead of sound. Radar is less affected by air temperature, vapour and pressure changes than ultrasonic. That makes it a strong option for harsh tanks and outdoor sites.
Radar sensors can be used on:
Water reservoirs
Chemical storage tanks
Bulk liquid tanks
Wastewater wet wells
Tanks with vapour or temperature changes
Some dusty solid storage applications
Open tanks exposed to weather
Radar is still non-contact, so the sensor stays above the liquid or material. This helps when the contents are corrosive, hot, dirty or difficult to access.
The technology handles many conditions that trouble ultrasonic sensors, but it is not magic. Foam can still reduce the reflected signal, depending on foam type and thickness. Heavy build-up on the antenna can affect performance. Incorrect mounting can cause false echoes from nozzles, tank walls, ladders or agitators. Very low-reflectivity materials need careful selection.
Radar suits South African outdoor sites because it copes well with changing weather and temperature. On a hot steel tank roof in Limpopo, the air space inside the tank can vary through the day. Radar is usually more forgiving than ultrasonic in those conditions.
Best fit:
Non-contact continuous measurement
Outdoor reservoirs and tanks
Vapour, condensation or temperature variation
Corrosive liquids where contact is undesirable
Sites needing reliable measurement with limited maintenance access
Be careful with:
Heavy foam
Product build-up on the antenna
Poor mounting positions
Internal obstructions
Very small tanks with limited installation space
Tank geometry that creates strong false echoes
Guided-wave radar uses a probe inside the tank
Guided-wave radar sends a radar pulse down a probe or cable. The signal travels along the probe and reflects from the liquid surface. Because the signal is guided, the instrument can work in applications where free-space radar or ultrasonic may struggle.
Guided-wave radar is often useful in:
Narrow tanks
Sumps and chambers
Tanks with internal obstructions
Foamy liquids
Low dielectric liquids where suitable
Interface applications where one liquid sits on another, if the instrument is selected for that purpose
The probe is both a strength and a limitation. It gives the measurement signal a defined path, but it also contacts the process. The probe must suit the liquid, tank height and mechanical conditions.
Long cable probes can move in turbulent tanks. Coated or sticky products can build up on probes. Agitators, mixers and inflows can damage or deflect them. In small tanks, a rigid probe may be simple. In tall vessels, installation and handling need planning.
Best fit:
Tall or narrow vessels
Applications with foam or vapour
Tanks where a probe can be installed clear of moving equipment
More difficult continuous level measurements
Some interface or low-reflectivity applications with correct selection
Be careful with:
Sticky build-up
Strong agitation
Mechanical contact with mixers or baffles
Product coating along the probe
Installation access for long probes
Materials that may damage the probe or mounting
Visual level methods still have a place
Not every tank needs an electronic transmitter. Visual methods include sight glasses, magnetic level indicators, dip tapes, gauge boards and marked transparent tubes.
They are useful when:
Operators are already on site
Manual checking is acceptable
The tank is small or low risk
A local indication is needed as a backup
The contents are safe to view through the chosen material
Power or instrumentation is not available
Visual methods are simple, but they rely on people. A sight glass that no one checks does not prevent an overflow. A dip reading taken once a day will not catch a pump that fails at night. Sight glasses can stain, block, break or become unreadable. Dip tapes are not ideal for hazardous, corrosive or hygienic duties.
The best use for visual level methods is often as a secondary check. A reservoir can have a transmitter for control and a gauge board for operators. A chemical tank can have a level transmitter and a local indicator for delivery checks.
Practical comparison table for tank and reservoir level measurement
The table below gives a field-focused comparison. It is not a product specification sheet. Final selection should always account for the liquid, tank shape, access, control system and site conditions.
Level method | Best use | Main strengths | Main limitations | Typical output or signal |
Float switch | High or low alarms, pump start-stop, overflow backup | Simple, easy to understand, good for point control | Can stick, foul or tangle. Not continuous | Relay or switch contact |
Hydrostatic pressure sensor | Continuous level in reservoirs, tanks, sumps and wet wells | Good for deep water, unaffected by surface foam, practical for submerged use | Affected by density changes, vent tube moisture, sludge build-up | Analogue signal, digital signal or local display depending on instrument |
Ultrasonic level sensor | Non-contact level in open or vented tanks | No contact with liquid, good for clean water tanks and many reservoirs | Foam, vapour, condensation, turbulence and obstructions can affect readings | Analogue, relay, digital or controller-based signals |
Free-space radar sensor | Non-contact level in tougher tanks | Handles vapour, temperature changes and outdoor conditions better than ultrasonic | Foam, build-up and poor mounting can still cause problems | Analogue, relay, digital or network signal depending on setup |
Guided-wave radar | Continuous level in narrow, foamy or obstructed tanks | Guided signal path, good where non-contact echoes are difficult | Probe contacts product, can suffer build-up or mechanical damage | Analogue, relay, digital or network signal depending on setup |
Sight glass, dip tape or gauge board | Manual checking and local backup | Simple, no complex electronics for basic indication | Depends on operator checks, limited alarm or control value | Visual reading only |
For tank level measurement South Africa applications, the best choice often comes from combining methods. A municipality may use radar for continuous reservoir level and float switches for independent high-high and low-low alarms. A farm may use a submersible pressure sensor for borehole storage level and a float switch for pump protection.
Match the instrument to the tank and process conditions
A level device fails less often when it is chosen for the actual conditions, not for the ideal drawing.
Open tanks and reservoirs
Open tanks are exposed to weather, insects, algae growth, dust, access issues and wind. The liquid surface may be calm in the morning and rough during filling.
For reservoirs, common options include:
Ultrasonic sensors for clean, open water with a stable surface
Radar sensors for tougher outdoor conditions
Submersible pressure sensors for deep water or where surface conditions are poor
Float switches for backup high and low alarms
Gauge boards for quick local checks
A reservoir level sensor should be mounted where it can measure the main body of water, not the turbulence from an inlet pipe. The mounting bracket must stay rigid. A sensor that moves in the wind will give poor readings.
Closed tanks and process vessels
Closed tanks can have vapour pressure, fumes, cleaning cycles and temperature changes. A top-mounted non-contact device must suit the vapour space. A pressure-based system must account for any pressure above the liquid.
Radar and guided-wave radar often suit closed tanks because they are less sensitive to vapour and gas temperature changes than ultrasonic. Hydrostatic pressure can also work, but the installation may need a suitable pressure arrangement for the vessel.
Do not assume that a device used on a water tank will suit an acid, caustic, solvent or hot process tank. Wetted materials, seals, cables and mounting parts must match the contents and cleaning method.
Foamy liquids
Foam is a common cause of wrong level readings. It can absorb ultrasonic signals and reduce radar reflections. The instrument may read the top of the foam, the liquid beneath the foam, or no stable signal at all.
The right choice depends on whether the process needs to measure foam level or true liquid level. For true liquid level under foam, hydrostatic pressure or guided-wave radar may be better options. For overflow protection, a high-level switch placed at the correct point may still be needed.
Vapour, steam and condensation
Vapour and condensation are common in chemical tanks, hot water systems and enclosed reservoirs. Ultrasonic sensors can struggle when condensation forms on the sensor face or when vapour changes the sound path.
Radar usually handles these conditions better. Guided-wave radar can also work well when the probe and process connection suit the application. If condensation is heavy, mounting angle, nozzle design and antenna type become important.
Dust and dry solids
Level measurement is not only for liquids. Grain, feed, powder, cement-like materials and other dry products can create dust during filling. Dust weakens ultrasonic echoes and may coat sensors.
Radar is often preferred for dusty silos and bins, although installation still matters. The sensor should not point directly into the filling stream unless designed and configured for that duty. Angled repose surfaces can also make level readings less simple than liquid level.
Turbulence and mixing
Filling, draining, mixers and recirculation can disturb the surface. Ultrasonic and radar instruments may see a noisy echo. Floats may bounce. Guided probes may move. Hydrostatic sensors may see pressure pulses.
Good installation helps:
Move the sensor away from inlets
Use stilling wells where suitable
Add control delays to avoid pump chatter
Use damping in the transmitter or controller
Protect probes from direct mechanical force
Temperature and density
Temperature can affect the instrument, the liquid and the vapour space. It can also change density. This matters most for pressure-based level measurement because pressure relates to density and height.
For water tanks, density changes are usually manageable. For chemical or product tanks, confirm whether the liquid density changes with concentration, temperature or batch. If the product changes often, a non-contact distance method may be a better fit than pressure, provided the surface conditions suit it.
Outputs, alarms and pump control
The level device is only part of the system. The output must suit the control job.
Point outputs for alarms
Switch outputs are used for simple states, such as:
High level
High-high level
Low level
Low-low level
Pump start
Pump stop
Float switches are common here, but many continuous transmitters also provide relay outputs or can feed a controller that creates alarm setpoints.
High-high alarms should be treated as protection, not normal control. If a tank reaches high-high often, the control strategy needs attention.
Continuous outputs for readings and control
Continuous transmitters send a changing level value. That value can be shown as metres, percentage, volume or a local engineering unit chosen by the site.
Common uses include:
Displaying reservoir level at a pump station
Feeding level to a PLC
Starting and stopping pumps at adjustable setpoints
Trending water use
Sending level to telemetry
Controlling dosing or transfer processes
A continuous signal can also be scaled to tank shape. A vertical cylindrical tank is simple. A horizontal tank needs volume correction if the operator wants litres or percentage volume rather than height.
Pump control needs more than one setpoint
Good pump control avoids rapid starting and stopping. Use separate start and stop levels so the pump has enough drawdown or fill volume between cycles.
For example:
Start filling when a reservoir reaches a low level
Stop filling when it reaches a high level
Trigger low-low if the pump fails or supply runs out
Trigger high-high if the stop control fails
This gap between start and stop levels is often called hysteresis or differential. It protects pumps, contactors and valves from constant cycling.
Overflow prevention needs independence
Overflow prevention should not rely only on the same signal used for normal control. A blocked outlet, stuck valve, failed relay, wiring fault or incorrect setting can defeat a single control loop.
Better protection may include:
A continuous transmitter for normal level control
An independent high-level switch
A high-high alarm with a clear response
A physical overflow route where suitable
Regular testing of alarm devices
The same logic applies to dry-run protection. A low-level transmitter reading is useful, but an independent low-low switch can protect a pump if the main reading fails.
South African examples from the field
The examples below are general, but they reflect common level measurement problems across farms, factories, municipal sites and water systems.
Irrigation reservoir on a citrus farm
A farm may have a concrete balancing reservoir fed by boreholes and used for irrigation scheduling. The level changes slowly most of the day, then drops quickly during irrigation.
A practical setup could use a submersible pressure sensor for continuous level, supported by a low-low float switch to protect the pump. If the reservoir has a stable mounting point and a clear surface, ultrasonic or radar could also work from above.
Key concerns include lightning protection, cable routing, algae growth, insects, pump turbulence and access for cleaning.
Municipal reservoir with remote monitoring
A municipality may need to see reservoir level from a control room or telemetry system. Overflow wastes treated water, but low level risks supply interruptions.
Radar or ultrasonic measurement can work well from the roof or bridge structure if the measurement path is clear. Radar becomes attractive where condensation, heat, wind or changing surface conditions cause unreliable ultrasonic readings. Independent high and low switches can support alarm verification.
Key concerns include secure mounting, vandal-resistant installation, backup power strategy and a clear alarm response procedure.
Food or beverage ingredient tank
A factory may store water, syrup, cleaning chemicals or ingredients in tanks that need hygienic handling and reliable stock visibility.
Non-contact radar can reduce contact with the product. Hydrostatic pressure can work in some tanks, but cleaning cycles, density changes and mounting hygiene must be reviewed. Visual indicators may support local checks, but they should not replace process alarms where overflow or shortage affects production.
Key concerns include cleaning, temperature, foam, tank geometry and integration with the plant control system.
Wastewater pump station sump
A wastewater sump often has foam, grease, rags, turbulence and unpleasant access conditions. Floats are common, but they can foul. Ultrasonic sensors avoid contact, but foam and condensation may create unstable readings.
Radar or a suitable pressure sensor can be a better choice, depending on the sump design. Some sites still use floats as backup because they are easy to test and understand.
Key concerns include fouling, safe access, pump starts per hour, wet well turbulence and routine cleaning.
Chemical dosing tank at a water treatment plant
Chemical day tanks can be small, enclosed and fitted with bunding. Contents may be corrosive, vapour-producing or sensitive to contamination.
Ultrasonic may work for some chemicals, but vapour and condensation can be a problem. Radar or guided-wave radar may offer better reliability if materials suit the chemical. A low-level alarm helps prevent dosing failure, while high-level protection helps deliveries stop before overflow.
Key concerns include chemical compatibility, vapour, fill turbulence, bund access and operator safety procedures.
Installation checklist for tanks and reservoirs
Use this checklist before ordering, fitting or commissioning a level device.
Confirm the measurement job
Decide whether the site needs point alarms, continuous level or both
Define normal operating level, high level, high-high level, low level and low-low level
Decide whether the display should show height, percentage or volume
Identify what action each alarm must trigger
Check the liquid or material
Confirm whether it is water, wastewater, chemical, fuel, slurry, grain, powder or another product
Check whether density changes during operation
Check for foam, vapour, dust, solids, sediment or sticky build-up
Confirm whether the contents are corrosive, hot or abrasive
Review the tank shape and installation point
Measure the tank height or reservoir depth
Identify internal obstructions such as ladders, braces, mixers and pipes
Check the inlet position and avoid direct filling streams
Make sure the sensor has a clear measurement path
Confirm safe access for installation and future maintenance
Plan the electrical and signal side
Match the output to the control system
Allow for local indication if operators need it
Plan cable routes away from damage and electrical noise where practical
Protect outdoor cable runs and junction boxes from water ingress
Consider surge protection for exposed sites
Set up the control logic
Use separate pump start and stop points
Add suitable delays to prevent nuisance alarms
Test high and low alarms under controlled conditions
Confirm what happens after a power failure
Record final settings for maintenance staff
Plan maintenance from the start
Make the sensor accessible
Create a safe cleaning method
Schedule checks for floats, probes, sensor faces and cables
Compare readings against a manual reference from time to time
Keep spare seals, brackets or basic accessories where downtime is costly
Common mistakes that cause poor level readings
Many level problems come from installation choices, not from the measuring principle itself.
Mounting the sensor above the inlet
A sensor looking at splashing water or a filling stream will not see a stable surface. Move it away from the inlet or use a stilling arrangement where suitable.
Ignoring the blanking distance
Non-contact sensors need space below the sensor face before they can measure correctly. If the maximum level rises too close to the sensor, readings may fail near full level.
Using pressure level where density changes
A pressure sensor can be excellent in water. It can be misleading where different products, concentrations or temperatures change density enough to affect the reading.
Treating foam as liquid
Foam is not always measured the same way as liquid. Decide what the process needs to control, foam top or true liquid level. Then choose the method around that requirement.
Forgetting about maintenance access
A perfect mounting point on paper may be unsafe or impossible to reach. If technicians cannot inspect or clean the device, reliability will suffer.
Relying on one device for everything
Normal control and emergency protection should not always depend on one signal. Critical tanks benefit from independent alarms.
Maintenance tips that keep level systems reliable
Level instruments last longer and perform better when routine checks are simple and consistent.
For float switches:
Lift or simulate the float during planned checks
Inspect for sludge, algae, scale or cable damage
Confirm the switch changes state at the expected level
Make sure the float cannot snag on pipework
For hydrostatic sensors:
Inspect the cable and suspension method
Keep junction boxes dry
Check for blocked or damaged venting where applicable
Clean the sensing area if sediment builds up
Compare the reading with a known manual level
For ultrasonic sensors:
Keep the sensor face clean and dry where possible
Check for spider webs, insects and condensation
Confirm the sensor still points at the correct target area
Review false echoes if tank internals change
For radar sensors:
Inspect the antenna or lens for build-up
Check that the mounting remains firm
Review settings after tank modifications
Keep the measurement path clear where possible
For guided-wave radar:
Inspect the probe for coating or damage
Make sure the probe is not touching internal metalwork unless designed for it
Check tension on cable probes where relevant
Clean sticky build-up before it affects readings
Six common FAQs about level measurement
What is the best way to measure water level in a reservoir?
For many reservoirs, ultrasonic, radar and submersible pressure sensors are all possible. Ultrasonic suits clean, calm and open water. Radar is better where weather, condensation or surface conditions are more difficult. Submersible pressure works well where the sensor can be safely installed below the water and protected from damage.
When should a float switch be used instead of a level transmitter?
Use a float switch when the job is a simple on/off action, such as high alarm, low alarm, pump start or pump stop. Use a continuous level transmitter when operators need a live reading, trend, percentage level or variable control.
Does foam affect ultrasonic and radar level measurement?
Yes. Foam can absorb or weaken ultrasonic signals and can also reduce radar reflections. The effect depends on the foam thickness and type. If the process needs true liquid level below foam, hydrostatic pressure or guided-wave radar may be a better option.
Can one level sensor control a pump and prevent overflow?
It can, but critical applications should not rely on one device only. A continuous transmitter may control the pump, while an independent high-level or high-high switch provides backup protection.
What output should be used for a PLC or telemetry system?
Continuous transmitters often provide an analogue or digital signal that a PLC, controller or telemetry unit can read. Switches usually provide contact outputs for alarms or pump commands. The correct choice depends on the control panel and monitoring system.
How often should level instruments be checked?
Check them often enough to match the risk of the tank. A low-risk rainwater tank may only need occasional checks. A chemical tank, pump station or municipal reservoir should have planned inspections, alarm tests and reading comparisons as part of routine maintenance.
The best choice is the one that fits the real tank
No single instrument is best for every tank, reservoir or storage vessel.
Float switches are still valuable for simple alarms and pump control. Hydrostatic sensors are practical for many water and sump applications. Ultrasonic sensors give clean non-contact measurement when the surface and air space behave. Radar handles tougher non-contact duties. Guided-wave radar helps where foam, narrow tanks or obstructions make free-space measurement harder. Visual methods remain useful as local checks and backups.
The most reliable systems start with the process, not the product. Define the control job, understand the liquid, inspect the tank, plan the output, and make maintenance easy. That approach gives farms, factories, water plants and municipalities a better chance of accurate level readings, fewer overflows, fewer dry pumps and less time spent fault-finding in the field.
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