Selecting the right pressure transmitter is essential to ensure accurate measurements, reliable performance, and cost-efficiency in industrial processes. The decision depends on understanding the application, process requirements, and technical specifications.
1. Understand your application
- Measurement type:
- Gauge pressure: Measures pressure relative to atmospheric pressure, commonly used for tanks or pipelines.
- Absolute pressure: Measures pressure relative to a perfect vacuum, ideal for vacuum systems.
- Differential pressure: Measures the difference between two points, often applied in flow and level monitoring systems.
2. Define process conditions
- Pressure range:
- Select a transmitter with a range slightly above your maximum operating pressure to avoid overload.
- Example: The PT600 series offers ranges up to 150 bar, making it versatile for high-pressure systems.
- Temperature range:
- Ensure compatibility with the process temperature.
- Example: For high-temperature applications, the PT60 Type T handles media temperatures up to 150°C, ideal for hygienic or CIP systems.
- Media type:
- Corrosive or abrasive fluids may require specialized materials.
- Example: The LT100 submersible transmitter is available with Hastelloy or titanium diaphragms, making it ideal for highly corrosive environments.
3. Determine accuracy and resolution
- Accuracy:
- Critical applications like pharmaceuticals or aerospace often need high accuracy, such as ±0.1%.
- Example: The PT03RS provides an accuracy of 0.15% and supports MODBUS communication for precision applications.
- Resolution:
- Higher resolution transmitters are essential for fine control.
- Example: The PT600 differential pressure transmitter offers high sensitivity, making it suitable for small pressure differentials in HVAC or filter monitoring.
4. Select the output signal
- Analog or digital:
- Analog: 4–20 mA is the standard for compatibility with most control systems.
- Digital: For advanced diagnostics and integration, choose transmitters with HART or MODBUS protocols.
- Example: The LT10 level transmitter supports HART communication, combining simplicity with modern remote configuration.
5. Consider installation and environment
- Process connection:
- Choose connections like threads, flanges, or hygienic fittings based on the application.
- Example: The PT60H hygienic transmitter offers SMS and DIN 11851 connections for cleanroom and food industry environments.
- Ingress protection:
- Ensure a suitable IP rating for environmental conditions.
- Example: The PT03 series features an IP67 stainless steel body, ideal for wet or outdoor installations.
- Hazardous environments:
- Check if explosion-proof designs are necessary.
- Example: The PT03RSE is designed for intrinsic safety in explosive zones, adhering to ATEX standards.
6. Evaluate additional features
- Autozero function:
- Simplifies recalibration during installation or maintenance.
- Example: The PT600RSH includes an innovative autozero feature, allowing quick adjustments without additional tools.
- Lightning protection:
- Protects against electrical surges in outdoor installations.
- Example: The LT100 series offers lightning protection, meeting Class 1 IEC standards.
7. Check certifications
- Ensure compliance with necessary certifications:
- Food-grade applications: FDA-approved materials.
- Hazardous areas: ATEX or IECEx certifications.
- Example: The PT600 series meets CE and RoHS standards, with options for ATEX certification.
Conclusion
Choosing the right pressure transmitter involves evaluating your application, process conditions, and additional features to ensure optimal performance and safety.
Whether you need a compact, low-cost transmitter like the PT03, a high-performance hygienic option like the PT60H, or a rugged submersible solution like the LT100, Pondus Instruments offers a wide range of solutions tailored to industrial needs.
For personalized recommendations and expert assistance, contact Pondus Instruments today!
