Level Monitoring | Float Sensors
Real-time level monitoring over an IP network using a standard web browser!
Monitor liquid levels with a float sensor and a ControlByWeb™ module. Receive text/email alerts when a user-specified level is reached. Log and graph a tank’s level data over time.
How do Float Sensors Work
Magnetostrictive liquid level sensors consist of a float that moves up and down a stem, or rod. The float contains a permanent magnet, and the stem houses a wire waveguide that creates a magnetic field, making it possible to detect the floats position on the stem.
An electrical pulse travels down the waveguide, magnetizing it. When the pulse meets the magnetic field from the float, a vibration, also called a strain pulse, travels back to the sensor housing.
The Float sensor then measures the difference in time between the initial pulse, and the strain pulse, giving it an accurate and continuous reading of the tank's current level.
Float Sensors work well with clean and dirty liquids, as they are customizable for almost any application.
Float Sensor Benefits
- Easy to install.
- Provide the most reliable and accurate method of level monitoring.
- MPX float sensors are customizable for monitoring up to 32 ft with multiple float sensors.
- Sensors are accurate within 0.05% of its detected range.
Easily configure sensor data using the X-404 Modbus Master Controller. No voltage scaling required!
For exisiting systems that require 4-20mA, connect the sensor to one of our compatible devices (X-418, X-420, X-22s).
Top of Tank
Carefully lower the MPX Float Sensor into the tank, then secure the sensor to the tank. If the floats don't fit through the mounting hole, remove the floats and connect the floats from the inside of the tank after the stem has been lowered through the mounting hole.
- Max Length: Up to 32ft. (175.25m)
- Accuracy: Greater of ±0.04 in. (±1mm)
or 0.05% of full range
- Resolution: Modbus ±0.04 in. (±1mm)
4-20 mA: 14 bit DAC
- Operating Temp: -40°F to 180°F (-40°C to 80°C)
- Modbus RTU (RS-485) with Temperature output
- 4-20mA, 2-Wire
- Dual 4-20mA (Loop-Powered 3 wire)
- External Power: 12-24 VDC
- Protection Rating: NEMA 4X, IP65
- Certifications: Class 1 Division 1 Groups C & D, Class 1 Zone 1, Class 1 Zone 2
- NO CLOUD NEEDED! Remote connection available with ControlByWeb devices (see below)
- Automatic programming via ControlByWeb device
- Housing: Cast aluminium, epoxy coated
- Cable Length: Customizable
- Dual-Level: Monitor two liquid levels with a single sensor
- Operating Temp: -40°C to 85°C
- Top of tank | Simple to install and program
Each float sensor can be connected to a ControlByWeb module to remotely monitor liquid levels in real-time using a standard web browser or mobile device. Liquid levels can be presented to the user as a simple liquid height measurement, or the module can be configured to calculate the volume of liquid used or the volume remaining in the tank and present that to the user. No special software required.
Remote Control & Monitoring
In addition to simple remote monitoring, ControlByWeb modules are fully programmable and provide custom control capabilities as well. For example, you can connect a pump to a relay on a ControlByWeb module and remotely run the pump manually, or configure the pump to automatically run if the level gets too low.
Level Monitoring in Hazardous Environments
Warning: Use of these products to monitor tank levels of potentially explosive liquids or substances (such as gasoline), requires strict adherence to local safety laws and regulations. ControlByWeb modules (such as the X-404, X-420, etc) are NOT designed to be intrinsically safe and must be installed with both physical and electrical safety barriers. Installation should only be performed by qualified individuals and companies who understand the safety requirements. Please refer to sensor installation manuals and consult local safety regulations for more information.
Intrinsically Safe - Modbus Monitoring
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Intrinsically Safe - 4-20mA Monitoring
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Oil and Gas
The MPX can be custom ordered to be chemically resistant, making it optimal for monitoring oil and gasoline.
Oil drilling uses powerful pumps to move mud out of the way of the drill. The MPX's sturdy design makes it ideal for the violent and turbulent conditions of a mud tank.
Tank level monitoring
In any application, the MPX provides the most reliable and accurate method of level monitoring.
Frequently Asked Questions
The MPX compares very well to an ultrasonic sensor's resolution and accuracy. Its resolution is ±4mm and it's accuracy is 0.05% of full scale, making it the most accurate monitoring solution. Ultrasonic sensors are accurate to 0.25% full scale.
Yes. The MPX continuous float level transmitter can measure two level simultaneously. The MPX can be custom ordered to include two floats, one that will float on the top of the oil, and the other that will float at the oil/water interface.
While floats getting stuck is a possibility, many different factors prevent this from happening. Some of these factors include the weight of the float, and the space between the float and the stem. We do not recommend using this product to monitor sticky liquids or materials that cause build-up, as these types of applications can lead to float sticking.
Compatible ControlByWeb Controllers
X-404 Modbus Master Controller
# of Sensors:
Connect up to 32
- Daisy-Chain modbus sensors
- No voltage scaling
- BASIC Interpreter
- Email Alerts
MND Modbus Display with Aluminum Housing
Local display for up to 10 sensors as a master, slave, or power source on any Modbus network.
Output: 24 V DC±1%, 1.75 Amp
Input Voltage: 100-240V AC
Input Frequency: 45-65 Hz
Power Supply | 12VDC
Regulated, 12V DC, 1.5Amp (100-240V AC Input)