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Tank Level Sensors


        Any sensor will work well in a waste tank—for a while. Have you ever had a float sensor foul in your waste tank? How did you fix it? Did you remove the sensor and clean it just to have it foul again a few months later?

        Why not just install a better sensor in the first place? All of the level sensors we manufacture are immune to fouling because none have any moving parts. In fact, our non-contact sensor below installs on the outside of the tank wall and never even comes into contact with the tank contents at all. A quick summary of key advantages of our sensor technology can be read here: Sensors.PDF (33kb).

        Scroll down (or click on a Quick Link below) to review the features for all of our level sensors. Once you have selected your sensors, put them into your online shopping cart by clicking on the appropriate Add To Cart buttons. You will need one sensor for each tank in your system. If you haven't already done so, select a monitoring and display panel on our Display Panels page.

        When you are finished shopping, click on the View Cart button at the upper right of each page to begin checkout.



Liquid Level Sensor Quick Links:

Standard non-contact external liquid level sensor.
Foil repair kit for non-contact external sensor.
Standard length in-tank rod-style solid-state liquid level sensor.
Extended length in-tank rod-style solid-state liquid level sensor.
SAE-5 to 1" NPT adapter for both of our sensor rods.
Fuel senders.



Typical non-contact sensor kit.
Non-contact sensor installed on a HDPE tank.

Non-Contact Level Sensors

        There are many good sensors for monitoring the level of fluid in a tank, but nearly all install inside of the tank. How about a sensor that mounts on the outside of the tank? One which never fouls, never leaks, and never needs to be removed for cleaning?

        Our Non-Contact sensor consists of a pair of sensor foils which are adhered to the outside wall of a HDPE plastic or fiberglass tank. To these foils a sensor module is attached which reads the foils and outputs a voltage proprotional to the fluid level in the tank.

        These sensors are great for monitoring both fresh and waste water tanks. Since they install on the outside of the tank, they install in a matter of minutes, require no special installation tools, and there is no risk of tank leaks as a result of sensor installation.

Basic Features:

  • Monitors fresh water or waste tanks.
  • Reads fluid level through a HDPE plastic or fiberglass tank wall.
  • Installs easily without any special tools.
  • Power-on light for troubleshooting.
  • No chance of tank leaks due to sensor installation.
  • No sensor contact with tank contents.
  • No moving parts to foul.
  • No mucking around in a waste tank to clean a fouled sensor.

Downloadable User Manual:

Sensor_Foil.PDF (29kb) Product manual for our external, foil-based fluid level sensor.

To Purchase This Sensor:

$35.95 SEN-FOIL, Non-contact external foil sensor kit (includes one sensor module and 5' of sensor foil).

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Foil repair kit for non-contact sensor.

Foil Repair Kit For Non-Contact Level Sensors

        Our non-contact fluid level sensor above is easy to install, but occasionally one of the sensor foils might be damaged during installation or one of the sensor wires might be pulled off some time later.

        To make sensor repair easy, we have put together a repair kit containing the materials for a quick fix.

This Kit Contains:

  • 2 self-adhesive copper sensor patches with 2" of lead wire attached.
  • 5' of aluminum sensor tape.
  • 2 butt-connectors.

To Purchase This Kit:

$14.95 FOIL-REPAIR-KIT, External sensor foil repair kit (includes copper patches with 2" of lead wire, 5' of aluminum sensor tape, and 2 butt-connectors).

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        Note: The non-contact sensor above is not appropriate for metal-walled tanks nor for monitoring fuel levels.

        If your tank has metal walls, or you do not have easy access to a tank side wall to mount a non-contact sensor, then one of our in-tank, rod-style sensors listed below may be an appropriate sensor option for you to consider.

        While these level sensors are mounted inside of the tank, they still offer a key advantage of our non-contact sensors: they are completely solid state and have no moving parts to foul due to contact with tank contents.



Standard length in-tank rod sensors.
Rod sensor shown in bent configuration.

Standard Length Rod Sensors

        Our standard length rod-style sensor is excellent for monitoring fresh or waste water tanks whose depths do not exceed 36".

        This sensor installs through a 1" NPT threaded hole through the top of the tank and is intended for monitoring fluid levels in metal-walled tanks. Additionally, since it has no moving parts to foul, it is also a superior alternative to traditional float sensors to monitor levels in your waste tanks.

        If your tank already has a SAE-5 hole sensor pattern, consider using our SAE-5 to 1" NPT adapter described below to simplify sensor rod installation.

        For customers without access to the top of their tank we also build this sensor with a 90° bend (sensor head pictured at right) to mount through a hole in the side wall of your tank. This sensor variant is built with one of our SAE-5 to 1" NPT adapters attached and requires the SAE-5 hole sensor mounting pattern be present on your tank.

Basic Features:

  • Monitors fresh water or waste tanks.
  • Sensor lengths from 6" to 30" (if you require a longer sensor see the extended length model below).
  • Installs in a 1" NPT threaded hole in the top of the tank.
  • SAE-5 to 1" NPT adapter available for mounting this sensor in tanks which already have an SAE-5 lug opening (see below).
  • Sensor also available with a 90° bend for mounting through a tank side wall.
  • Power-on light for troubleshooting.
  • No moving parts to foul.

Downloadable User Manual & Related Documentation:

Sensor_Rod.PDF (22kb) Product manual for our in-tank PVC rod-style fluid level sensor.
PVC_Cutting.PDF (9kb) Instruction sheet for trimming a in-tank PVC fluid level sensor to length.
SAE5_1NPT.PDF (24kb) Mechanical drawing for the SAE-5 to 1" NPT adapter.

To Purchase This Sensor:

        First select the length of sensor you need then click the appropriate Add to Cart button. To determine the proper length for your sensors, measure the depth of your tanks, subtract 1/2 inch, then round to the nearest inch. If you require a sensor longer than 30" see the extended length model below.

Length (in.) $50.95 SEN-ROD-STD-30, Standard rod sensor 6-30 inches in length.
Length (in.) $66.95 SEN-BENT-ROD-STD-30, Standard bent rod sensor 6-30 inches in length.

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Extended length in-tank rod sensor.
Rod sensor shown in bent configuration.

Extended Length Rod Sensors

        For tank depths greater than 30", we have developed an extended length rod sensor which looks nearly identical to our standard length rod sensors above. The only external difference between the standard and extended length sensor types is the addition of a small adjustment screw (pictured at right) used for factory calibration.

        Like our standard length model, this sensor also installs through a 1" NPT threaded hole through the top of the tank and is intended for monitoring fluid levels in metal-walled water or waste tanks.

        If your tank already has a SAE-5 hole sensor pattern, consider using our SAE-5 to 1" NPT adapter described below to simplify sensor rod installation.

        For customers without access to the top of their tank we also build this sensor with a 90° bend (sensor head pictured at right) to mount through a hole in the side wall of your tank. This sensor variant is built with one of our SAE-5 to 1" NPT adapters attached and requires the SAE-5 hole sensor mounting pattern be present on your tank.

Basic Features:

  • Monitors fresh water or waste tanks.
  • Sensor lengths from 31" to 48" (lengths in excess of 48" are possible, contact our engineering dept. for details).
  • Installs in a 1" NPT threaded hole in the top of the tank.
  • SAE-5 to 1" NPT adapter available for mounting this sensor in tanks which already have an SAE-5 lug opening (see below).
  • Sensor also available with a 90° bend for mounting through a tank side wall.
  • Power-on light for troubleshooting.
  • No moving parts to foul.

Downloadable User Manual & Related Documentation:

Sensor_Rod.PDF (22kb) Product manual for our in-tank PVC rod-style fluid level sensor.
SAE5_1NPT.PDF (24kb) Mechanical drawing for the SAE-5 to 1" NPT adapter.

To Purchase This Sensor:

        First select the length of sensor you need then click the appropriate Add to Cart button. To determine the proper length for your sensors, measure the depth of your tanks, subtract 1/2 inch, then round to the nearest inch.

Length (in.) $55.95 SEN-ROD-EXT-48, Extended rod sensor 31-48 inches in length.
Length (in.) $71.95 SEN-BENT-ROD-EXT-48, Extended bent rod sensor 31-48 inches in length.

Call us for pricing for sensor lengths in excess of 48".

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SAE-5 to 1 inch NPT sensor adapter.
Typical sensor rod installed through the adapter.

SAE-5 to 1" NPT Sensor Adapter

        Many marine tanks already have an opening for the installation of a standard float sensor. This opening has a center hole for the sensor and it is circled by 5 smaller threaded holes for mounting the sensor. This pattern is refered to as the American SAE 5 hole pattern.

        Since the SAE-5 hole pattern is common to so many marine tanks, we offer this adapter to simplify the installation of our rod-style level sensors. If you are replacing a standard float sensor with a rod-style sensor, just thread this adapter onto the rod and install the new sensor in place of the old one using the original gasket and screws.

        If your tank already has the SAE-5 hole pattern, this adapter will significantly simplify the installation of our sensor rods. By using the adapter you need only a screwdriver and wrench to install a sensor rod; no new hole for the sensor is required.

Basic Features:

  • Standard SAE-5 lug sensor pattern common to many marine tanks.
  • 1" NPT center hole to mount the sensor.
  • Adapter constructed out of 1/4" thick aluminum plate.
  • Compatible with both sensor rods above.

Downloadable Mechanical Drawing:

SAE5_1NPT.PDF (24kb) Mechanical drawing for the SAE-5 to 1" NPT adapter.

To Purchase This Adapter:

$19.95 SAE5-1NPT, SAE-5 to 1" NPT aluminum sensor adapter.

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Fuel Level Measurement

        Note: while we do not currently manufacture sensors for monitoring fuel levels, we can source fuel level senders manufactured by WEMA. All of our Profile Series monitoring and display panels are compatible with most industry standard fuel level senders (i.e. 33-240 Ohm float senders) including senders manufactured by WEMA.

        If your fuel tank already has a sender installed, odds are our displays are already compatible with it; if you need a sender for you fuel tank we can source it for you. Refer to the owners manuals for our Profile Series display panels on our Display Panels page for fuel sender installation instructions.

Click here to visit WEMA.
For WEMA product information, visit them at: http://www.WemaUsa.com/.

        For sender pricing and delivery information, contact Ferriello Sales at: Dennis@FerrielloSales.com.

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