STP03 Smart Pressure Switch with 4–20mA Output (PNP/NPN)

The STP03 Intelligent Pressure Switch is a high-performance industrial device integrating pressure measurement, display, control, and signal output in one unit. It features an oil-filled piezoresistive sensor with an isolation diaphragm, combined with a high-precision amplifier and A/D conversion for accurate and stable pressure monitoring. The 4-digit digital display shows real-time pressure values, while dual switch outputs (PNP/NPN optional) and optional 4–20mA analog output meet various automation control requirements. Adjustable setpoints and hysteresis allow flexible operation across a pressure range of 0–600 bar for gas and liquid media. With excellent resistance to vibration, shock, and electromagnetic interference, it is widely used in hydraulic systems, pneumatic systems, construction machinery, and industrial automation, making it an ideal replacement for traditional mechanical pressure switches.

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1. Key Features

4-digit digital display for real-time pressure reading (standard application)
Adjustable switching output based on preset pressure setpoint and hysteresis
Switching points can be freely set anywhere from zero to full scale
LED indicators on the housing for clear status and switching action monitoring
Dual switching outputs with load capacity up to 1.2A
Optional analog output (4–20 mA)

2. Technical Specifications

General Electrical Data

Pressure Range	0.1 to 600Bar
Pressure Reference	Gauge
Output signals	4–20 mA, PNP, NPN
Supply Voltage	24VDC

Performance Specifications

Accuracy	±0.5%F.S.
Long-term Stability	≤ ±0.2%F.S./year
Overpressure	200% FS
Burst pressure	500% FS
Temperature compensation range(accuracy maintained within this range)	-25°C to +85°C
Operating temperature range	-25 to +85°C
Storage temperature range	-20 to +85°C
Media temperature range	-30 to +85°C

3. Applications

Industrial Automation Equipment
Hydraulic and pneumatic systems
Petrochemical Equipment
Construction machinery
Process monitoring
Other industrial applications

4. Selection Guide

Pressure Sensor Selection Key Points: Confirm the measuring range, match the output signal, ensure media compatibility, select the appropriate mounting interface, and define the accuracy requirements.

5. FAQ (Frequently Asked Questions)

Q1: Does the STP03 intelligent pressure switch support OEM customization?

Yes, Shanghai Yatan offers OEM customization including pressure range, process connection, and output signals to meet specific industrial project requirements.

Q2: Can the STP03 replace traditional mechanical pressure switches?

Yes, with its fully electronic design, higher accuracy, longer lifespan, and flexible settings, the STP03 is an ideal upgrade from traditional mechanical pressure switches.

Q3: What is the pressure range of the STP03 intelligent pressure switch?

The pressure range covers from 0–0.1 up to 600 bar, with customizable ranges to suit various applications.

Q4: What media can the STP03 pressure switch measure?

It is suitable for non-corrosive gases and liquids compatible with stainless steel 304/316L, such as air, water, and oil.

Q5: What is the accuracy and long-term stability of the STP03 digital pressure switch?

It offers high accuracy up to ±0.5% F.S and long-term stability of ≤±0.2% F.S/year, making it suitable for demanding industrial environments.

Q6: How to set the switching point and hysteresis on the STP03 intelligent pressure switch?

Users can easily configure the pressure setpoints and hysteresis via the front panel buttons, ensuring precise control and reducing frequent switching for improved system stability.

Q7: Does the STP03 pressure switch support 4-20mA and PNP/NPN outputs?

Yes, the STP03 supports optional 4–20mA analog output as well as PNP or NPN switching outputs, making it compatible with various PLC and industrial control systems.

Q8: What applications is the STP03 intelligent pressure switch suitable for?

The STP03 intelligent pressure switch is ideal for hydraulic systems, pneumatic systems, water treatment, construction machinery, and industrial automation lines, providing accurate pressure monitoring and control for gas and liquid media.

6. Related Products

7. Contact Us

📧 Email: sales@yatansensor.com, support@yatansensor.com

💬 WhatsApp:+86 185 1660 2370

8. Model Selection / Ordering Code

Please specify the full ordering code when requesting a quotation.

        Quantity - Model – Measuring Range – Output Signal – Process Connection (Thread) – Electrical Connection – Insertion Length – Supply Voltage – Linearity

        Example:
        1 pcs - STP03 - 600Bar - PNP - G1/4 - Cable Output- 1m - 12VDC - 0.5%

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