Submersible Level Transmitter For Harsh Chemical Environments


Quality and reliability you can trust

The PT- 503 has been engineered with advanced materials for most chemical applications.

The Series PT-503 Submersible Level Sensor brings precision level measurement to harsh chemical environments. Engineered with advanced materials, the PT-503 can be used in many places that stainless steel and PVC can’t go. With user-friendly analog output options and the ability to submerge it up to 21 meters (69 feet) underwater (30 psig), the PT-503 simplifies the process of obtaining dependable level measurements in challenging chemical environments.

• Simple to install
• High precision, aplified outputs 4-20 mA, 0.5 - 4.5 VDC (Ratiometric)
• Withstands most caustic or corrosive chemicals

Chemical Compatibility
The PT-503 submersible pressure transmitter may provide resistance* to several common bleaching
and corrosive agents beyond that of stainless steel and PVC. For best results, check the exact
concentrations and temperature range compatibility of your liquid.

• Aluminum Chloride
• Benzene
• Butadiene
• Calcium Chloride
• Calcium Hydroxide
• Calcium Hypochlorite
• Carbon disulfide
• Carbon Tetrachloride
• Chlorine
• Hydrobromic Acid
• Hydrochloric Acid
• Magnesium Chloride
• Methylene Chloride
• Nitric Acid
• Phosphoric Acid
• Potassium Chloride
• Potassium Permanganate
• Silver Nitrate
• Sodium Hydroxide
• Sodium Hypochlorite
• Stearic Acid
• Sulfuric Acid
• Trichloroethylene

*Always confirm the concentrations and temperature ranges of your specific chemical environment.
This list does not constitute a guarantee of performance. Always conduct your own tests for


All common model configurations can be purchased online, click the model number link below. Refer to Model Number Configurator on the datasheet for a full list of configuration options.

Model Number Model Description
PT-503-7.5-PSI-G-L1-15-N12 4-20 mA output, 0-7.5 PSI, 15 ft cable
PT-503-15-PSI-G-L1-20-N12 4-20 mA output, 0-15 PSI, 20 ft cable
PT-503-30-PSI-G-L1-30-N12 4-20 mA output, 0-30 PSI, 30 ft cable
PT-503-7.5-PSI-G-L20-15-N12 0.5-4.5V output, 0-7.5 PSI, 15 ft cable
PT-503-15-PSI-G-L20-20-N12 0.5-4.5V output, 0-15 PSI, 20 ft cable
PT-503-30-PSI-G-L20-30-N12 0.5-4.5V output, 0-30 PSI, 30 ft cable

Pressure Range
0 to 30 psig
Analog Output
B.F.S.L. ≤ 0.25% of span
1-year stability ≤ 0.25% of span
Temperature Compensation Range
32 to 122° F (0 to 50° C)
Temperature Error (reference temp 70° F)
Zero: ±0.014% of Full Scale / °C (-18°C - 70°C)
Span: ±0.014% of Full Scale / °C (-18°C - 70°C)


Wetted Materials
FKM (Viton™ ETP)
Ceramic AL2O3




Supply Voltage
4-20 mA: 9-30 VDC 0.5 - 4.5 VDC: 4.5 - 5.5 VDC
Current Draw
4-20 mA: 3-30 mA 0.5 - 4.5 VDC: 3mA


Operating Temperature
-18°C - 70°C (0°F - 158°F)
Maximum Submersible Depth
69 ft / 21 m in water / 30 psig

Fluid Maximun Specific Gravity

Vented Urethane Cable
Tensile Strength up to 200 lbs


0.5 - 4.5 VDC (Ratiometric)
Internet Connectivity
4-20mA version via RST-5003

Why the PT-500 is the Best Submersible Pressure Transducer in its Class
How to Re-zero the PT-500 Submersible Pressure Transducer
How to Clean Your PT-500 Submersible Pressure Transducer

Have a Question?

You can contact us directly by clicking the link, connecting with us on social media, or sending us a chat during business hours.