A water witch float switch is a device used to detect the level of water in a tank or reservoir. It consists of a float that rises and falls with the water level and a switch that is activated when the float reaches a certain position. The float is typically made of buoyant material such as plastic or foam and is attached to a lever or rod. As the water level rises, the float also rises and eventually reaches a position where it activates the switch. This switch can be a simple mechanical switch that is flipped when the float rises, or it can be an electronic switch that detects the position of the float using sensors. The water witch float switch is commonly used in various applications such as sump pumps, water tanks, and sewage systems.

Trouble Shooting Float Level Sensor

1. If switch or switches do not seem to be working, measure each switch with an OHM (resistance) meter. When ohms measure zero, switch is closed, when ohms measure infinite or over 2 MEG OHMS, then switch is open.

2. Move float up and down and take ohm measurement for each switch to determine if switch is turning on and off as desired. Be sure to confirm that the wire color matches the level switch being tested. If OHM reading is not correct, sensor is not operating properly. Potential reason for the sensor not operating correctly is:

Float is not positioned properly or moving properly: Float clips (or collars) may have come loose, have been moved or not in the proper place. Inspect for debris or build up on the floats that would prevent them to move properly.

Shock or damage to the floats or the sensor assembly (bent, dented, etc.). Sensors need to be handled and installed with care. Check to make sure shipping container was not damaged. Internal reed switch has hermitically sealed glass housing that can break. Floats have magnets inside that can break or become dislodged from rough handling or significant shock or vibration.

Excessive moisture around the wires where they exit the sensor. This typically results in a switch not turning off (staying closed).

Reed switch failure: This can happen when high voltage or current (or a short) is connected to the reed switch, exceeding the switches switching capacity.

Floats specific gravity does not match the liquid that is being measured

Wire color does not match level switch. When connected to one switch, attempt to activate/deactivate all switches to determine which switch is connected to what wire color.

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Controls Know-How: What is a Float Switch?

A float switch is a simple device that is used to detect the level of liquid in a tank and control an external component, such as a pump, valve, alarm or other device. As the name suggests, the switch floats on top of the liquid and typically uses an electrical microswitch to control the component as the liquid level rises and falls to a pre-set level.

How does a float switch work?

A float switch usually works via a chrome-plated or stainless steel ball, which is secured in a rolling chamber and used to operate an electrical microswitch. As the liquid in the tank well or sump goes up or down, a sensor detects when it has reached a predetermined level and uses the electrical microswitch to switch the component (such as a pump or alarm) on and off accordingly. Float counterweights may also be used to balance and control the differential switching point of the float and can be fixed to any chosen point on the cable as required.

Common float switch applications

Float switches are used for a wide variety of filling and emptying applications to provide pump control and high/low-level warning indication. They are used across a diverse range of industries including sewage treatment, agriculture, food processing, leisure, mining and many more, providing a simple and cost-effective level control solution.

We offer a range of high-quality float switches to suit many different requirements, including:

FLO101 - ATEX/IECEx Approved for Zone 0 applications and low current switching.

FLO102 - Non-mercury operated and polypropylene housing for general use.

FLO103 - Non-mercury operated and polypropylene housing for general use.

FLO106 - EPR insulated cable for diesel and fuel oil applications.

FLO107 - WRAS-Approved for use in potable water handling.

Each is constructed with a high quality polypropylene housing, providing a high level of strength and resistance to most liquids. Our float switches are easy to install and have been rigorously tested to provide reliable operation over a long period of time.

THINGS TO CONSIDER WHEN BUYING A FLOAT SWITCH

Carefully selecting the float switch will help ensure you get a reliable, safe and long-lasting component that fully meets the demands of the application and requires minimal maintenance.

LIQUID TYPE

The right type of float switch for your specific application will depend on a number of different factors including the type, density and viscosity of liquid.

For example, for potable water (drinking water) applications, you will need to choose a float that is constructed from WRAS approved materials, such as the Potable FLO107.

Likewise, applications involving liquids such as diesel fuels or heavy sludge will require a product constructed for that type.

ENVIRONMENT

Careful consideration should be given to the operating environment. For example, can the float withstand immersion pressure at a specific depth? Is it constructed to withstand impact from a turbulent installation in a more challenging environment? We offer a wide range of float switches that have pressure ratings of up to 5 bar.

Float switches may use various materials that make them suitable for different applications. For example, products using rubber cables (like HO7RN8-F and HO5RN-F) are ideal for water and damp atmospheres, whereas PVC cables float switched like the FLO106 provide resistance to oils and are ideal for use with diesel and fuel.

When being installed in a hazardous environment including those involving explosive gas, you will require an ATEX rated float switch paired with a galvanic isolation barrier or relay. Our FLO101 float switches are specially designed for zone 0 applications and low current switching, being both ATEX and IECEx approved.

For longevity, ensure that the rolling chamber of the switch limits the Nm of force that is exerted on the microswitch during contact. Finally, carefully research the electrical element of the switch to make sure it meets your requirements and can be operated safely.

Explore our range of Level Control Float Switches. For advice on choosing the right float switch for your specific application, chat to our experts on +44 (0)1630 647200.

Water Witch Bilge Switch, 101

The Water Witch® submersible electronic bilge pump switches allow boat owners to forever rid themselves of the archaic outdated float switch. Instead of an unreliable and short-lived mechanical float switch, our electronic bilge switches have no moving parts and require no adjustments. This eliminates the chance of your battery dying or your pump burning out because of a jammed-on float switch. Temperature, humidity and electrical noise will not effect this switch, nor will it interfere with other electronics. This switch comes with an unprecedented 7 year limed warranty (5 years for Model 101) and is in use by both the Canadian and U.S.Coast Guards.

• 12V Compact design makes for easy installation
• Supports up to 15 Amps
• 5 Year Limited Warranty
• 2”W x 1.335”H x 1”D
• Delay on 6-8 Seconds
• Delay off 14-16 Seconds

The water witch float switch is commonly used in various applications such as sump pumps, water tanks, and sewage systems. It is an important component in these systems as it helps prevent overflow or dry running of pumps. When the water level reaches a certain point, the switch is triggered and the pump is activated or deactivated accordingly.

Ratings & Reviews

3 reviews

4 stars

3 stars

2 stars

1 star

jacky patterson

first time to order so I will waite to see what i get.

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Best no moving parts boat bilge switch float

I buy these WATER WITCH for all the boats I own. They work perfect, I mount them to the bilge pump as low as possible with zip ties



When you power them up it comes on for 5-10 seconds as a self test. Then it shuts off.

When water touches both the metal pieces it turns on the bilge pump. When water drops below the metal tabs it stay on for another 10-20 seconds to get the last bit of water out.

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Old fisherman

by Old fisherman

It was a like for like product. The original one lasted 14 years. Hope to get at least that long out of this one. Ordering was easy, product was as described, received order a day earlier.

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Customer FAQs

In addition to its use in pumps and tanks, the water witch float switch is also used in other applications such as water heaters, irrigation systems, and rainwater harvesting systems. Its versatility and reliability make it a popular choice for detecting water levels in different settings. Overall, the water witch float switch is a simple but essential device for monitoring water levels. Its ability to automatically control pumps and prevent water damage or wastage makes it a valuable tool in a variety of industries and settings. Whether it is used in residential, commercial, or industrial applications, the water witch float switch plays a crucial role in maintaining the proper level of water and ensuring efficient operation of systems..

Reviews for "DIY Projects: Creative Uses of Water Witch Float Switches"

1. John - 2 stars - I was really disappointed with the Water witch float switch. It claimed to be reliable and efficient, but it failed to function properly within just a few months of use. It would often get stuck in one position, causing my sump pump to either not turn on or not turn off. I contacted customer service, and they were not helpful at all. They didn't seem to care about my issue and offered no solution or replacement. I would not recommend this product to anyone.

2. Sarah - 1 star - The Water witch float switch was a complete waste of money for me. I installed it in my basement to help prevent flooding, but it didn't work at all. It never activated the pump when the water level rose, leaving me with a flooded basement and a ruined carpet. I reached out to the company for assistance, but they were unresponsive and didn't offer any help or support. I ended up having to buy a different float switch from a different brand, which worked perfectly. Don't waste your money on this unreliable product.

3. Mike - 2 stars - The Water witch float switch was a disappointment for me. While it initially worked fine, it started to malfunction after a few months. It would frequently get stuck in the on position, causing my sump pump to run continuously. This not only wasted energy but also put unnecessary strain on the pump. I had to manually monitor the switch and tap on it to make it function properly again. Overall, I expected better quality and durability from this product.

4. Emily - 2 stars - I had high hopes for the Water witch float switch, but it fell short of my expectations. It worked okay for the first few weeks, but then it started to get obstructed by debris in the water, causing it to get stuck and not activate the pump. I had to clean it constantly to keep it functioning, which was a hassle. In addition, the switch became less responsive over time, requiring more force to trigger it. I would not recommend this product for its lack of reliability and ease of use.

5. Mark - 3 stars - While the Water witch float switch generally did its job, I found it to have a few flaws. It tended to get easily triggered by minor water disturbances, leading to frequent and unnecessary pump cycles. This led to higher electricity bills and wear and tear on the pump. It also didn't have a reliable fail-safe mechanism, and the float sometimes got stuck in a tilted position, not allowing the pump to activate even when there was a significant amount of water. Overall, it could use some improvements to make it more efficient and reliable.

How to Choose the Right Size Water Witch Float Switch for Your Tank