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Level Monitoring | Pressure Sensors | Pressure Transducers

Real-time level monitoring over an IP network using a pressure transducer, a Modbus Controller, and a standard web browser!

Pressure Transducer & Level Monitoring

Monitor liquid levels with a Pressure Transducer and a ControlByWeb® module (See recommended products below) Receive text messages or email alerts when a user-specified level is reached. Log and plot the level history, and more.

How do Pressure Transducers Work

Submersible pressure transducers work just like other pressure transducers, except they’re inside a water-tight housing, and they read in feet or inches of liquid (adjusted to specific gravity) rather than PSI.

When a pressure sensor is installed near the bottom of a tank. It uses an internal diaphragm which flexes with changes in pressure. This flexing sends an electrical signal to the attached ControlByWeb module which automatically calculates the depth. This data can then be viewed using a standard web browser over an IP network.

The Submersible Presssure Sensor detects pressure levels to monitor tank levels

Liquid Types

The PT-500 is ideal for clean liquids and can be fitted with a protective cage, making it well suited to handle dirty liquids.

Stainless Steel Enclosure

The PT-500 Series are enclosed in stainless steel, making them compatible with most chemicals.

Clean Liquid
Dirty Liquid

Sensor Output

Modbus RS-485

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).

Recommended Installation

Tank Vents - Submersible Sensor

Thread the PT-500 Pressure Transducer through vents in a tank.
Tank must be vented to atmosphere.

Pressure Sensor installed through a tank vent

Head Pressure

Connect the pressure transducer to the head pressure to monitor tank levels.
Tank must be vented to atmosphere.

Submersible Pressure Sensor installed to the tank head pressure

 Sensor Specifications

  • Max Water Depth: Up to 575 ft. (175.25m)
  • Pressure Range: Up to 250 psig
  • Accuracy: B.F.S.L. ≤ 0.25% of span
    1 year stability ≤ 0.25% of span
  • Temp. Compensation Range: 32 to 122°F (o to 50°C)
  • Temp. Error (reference temp 70°F):
    Zero: ≤ 0.025% F.S./°F | Span: ≤ 0.025% F.S./°F
  • RS-485 Modbus | 4-20mA
  • Lightning Protection: Built In, Protected against reverse polarity, surge per IEC 61000-4-5
  • External Power: 10-28 VDC
  • Vented Urethane Cable: Tensile Strength up to 200 lbs
  • Lightning Protection: Compliant with IEC 61000-4-5 Standards for electrical surges
  • Intrinsically Safe: 4-20mA, Class 1, Div. 1 Groups C & D
  • Single Seal
Internet Connectivity
  • NO CLOUD NEEDED! Remote connection available with ControlByWeb devices (see below)
  • Automatic programming via ControlByWeb device
Sensor Material Options
  • 316L SS Sensor | Urethane Cable | Hytrel® Cable | PVC Cable | Delrin™ Nose Cone
  • Operating Temp: -40°C to 85°C
  • Enclosure Protecton: Submersible to 575 ft.
  • Top of tank | Head pressure | Simple to install and program

Users Manual - Modbus (PDF)
Users Manual - 4-20mA (PDF)
Data Sheet (PDF)
PT-500 Pressure Transducer for Level Monitoring

PT-500 Pressure Transducer

Call for Part Numbers & Pricing

PT-500 Pressure Transducer + X-404 Modbus Master Controller

Web Enabled

All logic occurs on device, no cloud necessary.

Email/Text Alerts

Customizable email/text alerts based on sensor states.

Web Enabled

Monitor sensor status using a standard web browser.

Web Enabled

Connect up to 32 modbus devices/sensors.

Web Enabled

Easily create custom logic, no scripting neccessary.

Logging and Graphing

Log and graph sensor states over time.

Control Pumps Using Submersible Pressure Transducer Data

Control Options

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

Control tank pump with peer-2-peer communication

Click to Enlarge

Intrinsically Safe - 4-20mA Monitoring

Control tank pump with peer-2-peer communication

Click to Enlarge

Common Industries

Monitoring wasewater lift stations liquid levels

Wastewater Lift Station

Ideal for a variety of chemicals, the PT-500 can monitor liquid levels in wastewater lift stations.

Waste water management

Tank level monitoring

Monitor tank levels for tanks with limited access points (i.e., Vents, Head Pressure).

Leachate tank monitoring

Wastewater Leachate Tanks

Prevent Sanitary Sewer Overflows (SSOs) with the PT-500 and ControlByWeb controllers.

Frequently Asked Questions


Yes. The PT-500 series is made from 316L stainless steel, making it suitable for most caustic or corrosive chemicals.


The PT-500 series includes models that are submersible up to 300 PSI Contact us to get the right sensor and cable length for your needs.


You can adjust the zero in our PT-500 series submersibles with a simple magnet. Simply touch the magnet to the side of the housing, and move it up and down the sensor body to move the zero point up or down as needed.


Electrolysis can occur when the sensor is attached to multiple grounds. A difference in electrical potential between multiple grounds creates a flowing current between them, causing electrolysis.

To fix this problem, you'll need to ensure that your sensor is only attached to a single ground. The electrolysis is probably happening because the submersible sensor is case grounded to the liquid around it, and the current is flowing from the sensor housing to the nearest ground point. All you have to do in this situation is to disconnect the ground wire of the sensor at the wiring terminal inside the control box.


The vent tube on each submersible pressure sensor vents the chamber behind the sensor's diaphram, allowing it to reference the atmospheric pressure when measuring the tank pressure. Blocking or obstructing the vent tube can be detrimental to the sensor, and causes inaccurate readings.

The vent tube must be kept unobstructed as well as dry. Condensation can build up in the vent tube, and drip down into the sensor's electronics. To remedy this, the sensor can be bought with one of the two options: a desiccant cartridge or a hydrophobic, breathable vent cap. Make sure to install one of these to protect the sensors electronics.


Lightning strikes are a big problem for submersibles because they’re often attached to outdoor electronics and submerged below ground. Most distributors recommend buying a separate and expensive surge protector.

With the PT-500 series, lightning protection is built right into the sensor with reverse polarity and surge protection per IEC 61000-4-5.

Pressure Sensors


PT-500 Submersible Pressure Transducer


Submersible pressure transducer for long-range level monitoring in extreme conditions


Custom Orders

Starts at $699.95

For Part Numbers & Pricing

Compatible ControlByWeb Controllers


X-412 Modular I/O Controller

In Stock




# of Inputs: 4 Analog Inputs

Input Type: Single-ended, differential, 4-20mA (0-20mA), or a combination


  • Task Builder
  • BASIC interpreter
  • Remote services




X-404 Modbus Master Controller

In Stock




# of Sensors: Connect up to 32

Sensor Type: Modbus RS-485


  • Daisy-Chain modbus sensors
  • No voltage scaling
  • Logging
  • BASIC Interpreter
  • Email Alerts
  • Peer-to-peer




X-404C Cellular Modbus Master Controller

In Stock




# of Sensors: Connect up to 32

Sensor Type: Modbus RS-485


  • Cellular Modem
  • Daisy-Chain modbus sensors
  • No voltage scaling
  • Logging
  • BASIC Interpreter
  • Email Alerts
  • Peer-to-peer




Local Display

MND Modbus Network Display

MND Modbus Display with Aluminum Housing

Lead Time: 2 Weeks




Local display for up to 10 sensors as a master, slave, or power source on any Modbus network.




Power Supplies




Output: 24 V DC±1%, 2.5 Amp

Input Voltage: 100-240V AC

Input Frequency: 50-60 Hz ±5 Hz




Power Supply | 12VDC

In Stock




Regulated, 12V DC, 1.5Amp (100-240V AC Input)



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