Electrode Water Level Sensor

*** Scroll down to the bottom of the page for the
purchase of this water level sensor and its metal rods.

Electrode water level sensor is also known as a “Conductivity Level Sensors”.

Electrode sensor basically requires physical contact with the water to detect the water level. The water act as resistance. Small electronic current will be passing through the water which helps the sensor to sense the water level. For this reason, not all liquid can use this sensor for detection. One example is oil, which has an insulating property in nature. If you need to measure the level of a non-conducting liquid, consider using an ultrasonic water level sensor.

For a typical water tank or rainwater level detection, the electrode sensor is an affordable and commonly used method to detect the amount of water in a tank compared to other water level sensing method.

Electrode Sensor for Water Level Detection

An electrode sensing needs at least two contact point to function. For electrode with only a single probe, the other end of the sensor wire will be connected to a metallic tank (usually of stainless steel material). The metallic tank will act as the second probe. If the tank is not metal, or you do not want to connect the sensor wire to your tank, you can use a two probe electrode.

For multiple water level detection, you will need more probes. You can place up to a maximum of 5x probe for 3-4 water level detection. If you need to differential more water levels, you may like to consider using an ultrasonic water level sensor which can provide a higher resolution of detecting the water level.

Electrode water level sensing system
illustration from Omron logo website.


Electrode Holder (PS-5S)

Electrode holder     Electrode holder and electrode probe
illustration from Omron logo website.

Available models for a different number of probes.

  • PS-5S (for 5 rods)
  • PS-4S (for 4 rods)
  • PS-3S (for 3 rods)

Mounting hole diameter to cut out for the electrode holder is Ø 65mm
(Replacement model full horn 3/4″ MB7052XL, 3/4″ NPS WR Housing)

Replaceable model from Panasonic

Depending on stock availability we may replaced stocks with Panasonic models. They are compatible parts.

  • PS-5R
  • PS-4R
  • PS-3R

Check out below to order today.

Buy Electrode Water Level Sensor

  • Electrode Holder
  • Electrode Rod
  • Big Holder Nut (diameter 54mm)

*** Parts are sold separately as individual pieces.



Electrode Probe or Rod

Electrode probe or electrode rod
illustration from Omron logo website.


Water Level Sensor Controller

The water level sensor works together with the controller 61F-GP-N to form a network of switch relay. These relay can be activated when the water level reaches a certain level.

The following is an illustration a connection wiring diagram from OMRON, how you can wire up a 4 rods electrode configuration to sense the water level at 3 critical water level.

Water level sensor controller connection wiring diagram.

Installation Information


Electrode Sensor Rod Replacement

Electrode sensor rod can get worn off after a period of operation. The electrode can be replaced. You can send in photos of your electrode and its holder for a quotation on a replacement. Please provide us with the size/length of the electrode and also the type of liquid you are using the electrode for.

Please also note that when your electrode sensor is not working, there may also be a chance that the electronic sensing system is faulty. Do check if the sensing electronic system is in good working condition before proceeding to change the electrode.

Send us your enquiry today.

More Water Level Sensing Technologies

Click here to check out this page for more water level sensing technologies, or this page to compare other water sensing technologies.

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Brand Name
OMRON, Panasonic
Product Name
Electrode Holder for Water Sensor
SGD 95
Product Availability
Pre-Order Only