Pressure Level Sensors

PT-500 Pressure Sensor
$699.95
PT-500

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

Max Water Depth: Up to 575 ft.

Pressure Range: Up to 250 psig

Modbus RS-485 | 4-20mA

External Power: 10-28 VDC

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This user-friendly display is compatible with select ControlByWeb devices and does more than simply display its sensor’s readings. Features include the ability to alter sensor settings using the Modbus registry and to power a sensor with its batteries. Works on any Modbus network.

Easy 3-button programming

RS-485: 9600 baud (Modbus RTU)

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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 that 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.

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.

Sensor Output

Modbus RS-485

Easily configure sensor data using the X-404 Modbus Master Controller. No voltage scaling is required!

4-20mA

For existing 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.

Head Pressure

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

Sensor Specifications

PERFORMANCE

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

OUTPUTS

RS-485 Modbus | 4-20mA

ELECTRICAL

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

APPROVALS

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)

PROGRAMMING

Automatic programming via ControlByWeb device

SENSOR MATERIAL OPTIONS

316L SS Sensor | Urethane Cable | Hytrel® Cable | PVC Cable | Delrin™ Nose Cone

ENVIRONMENTAL

Operating Temp: -40°C to 85°C
Enclosure Protecton: Submersible to 575 ft.

INSTALLATION

Top of tank | Head pressure | Simple to install and program

Users Manual – Modbus (PDF)

Users Manual – 4-20mA (PDF)

Data Sheet (PDF)

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 Example Diagram

Intrinsically Safe 4-20mA Monitoring Example Diagram

Common Industries

Wastewater Lift Station

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

Tank level monitoring

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

Wastewater Leachate Tanks

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

Are these sensors resistant to caustic (corrosive) chemicals?

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

What is the maximum depth of these sensors?

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.

How do I adjust the zero level on my submersible sensor?

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.

How do you prevent electrolysis when using these sensors?

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.

What is a vent tube and why is it important?

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.

What is lightning protection and why is it important?

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.