1. Introduction
The Danfoss RT116 pressure switch is a robust and reliable component designed for conventional industrial and offshore applications. This series of switches has a long-standing history of over 60 years, proving its durability and performance in various demanding environments. The RT116 is part of a series that includes neutral zone pressure switches, safety pressure switches (specifically for steam boiler plants), and gold-plated fault protection switches for applications requiring high safety or energy efficiency.
This manual provides essential information for the safe and effective installation, operation, and maintenance of your Danfoss RT116 pressure switch.
Product Overview
Video: A brief overview of the Danfoss RT116 pressure switch, showcasing its physical appearance and packaging.
2. Specifications
The Danfoss RT116 pressure switch offers reliable performance with the following key specifications:
| Feature | Specification |
|---|---|
| Model Number | RT116 017-5203 (also 017-520366) |
| Pressure Range | 1-10 bar |
| Differential (Backlash) | 0.3-1.3 bar |
| Max Working Pressure | 22 bar |
| Process Connection | G3/8A |
| Contact Type | SPDT (Single Pole Double Throw) |
| Protection Grade | IP66 |
| Certification | CE, EAC |
| Battery Included | No |
| Origin | DK (Origin) / Made in Poland |
RT General Pressure Switch Series Overview
| Model | Setting Range (Bar) | Backlash (Bar) | Working Pressure (Bar) | Interface | Code |
|---|---|---|---|---|---|
| RT121 | -1-0 | 0.09-0.4 | 7 | G3/8A | 017-5215 |
| RT113 | 0-0.3 | 0.01-0.05 | 0.4 | G3/8A | 017-5196 |
| RT112 | 0.1-1.1 | 0.07-0.16 | 7 | G3/8A | 017-5191 |
| RT110 | 0.2-3 | 0.08-0.25 | 7 | G3/8A | 017-5291 |
| RT1A | -0.8-5 | 0.5-1.6 | 22 | G3/8A | 017-5001 |
| RT200 | 0.2-6 | 0.25-1.2 | 22 | G3/8A | 017-5237 |
| RT116 | 1-10 | 0.3-1.3 | 22 | G3/8A | 017-5203 |
| RT5 | 4-17 | 1.2-4 | 22 | G3/8A | 017-5255 |
| RT117 | 10-30 | 1-4 | 42 | G3/8A | 017-5295 |
RT Explosion Proof Pressure Switch Series Overview (EEx ia IIC T5)
| Model | Setting Range (Bar) | Backlash (Bar) | Working Pressure (Bar) | Interface | Code |
|---|---|---|---|---|---|
| RT1AE | -0.8-5 | 0.5-1.6 | 22 | G3/8A | 017-5009 |
| RT113E | 0-0.3 | 0.01-0.05 | 0.4 | G3/8A | 017-5195 |
| RT112E | 0.1-1.1 | 0.07-0.16 | 7 | G3/8A | 017-5185 |
| RT116E | 1-10 | 0.3-1.3 | 22 | G3/8A | 017-5201 |
| RT5E | 4-17 | 1.2-4 | 22 | G3/8A | 017-5252 |
| RT117E | 10-30 | 1-4 | 42 | G3/8A | 017-5298 |
3. Installation
WARNING: Installation should only be performed by qualified personnel in accordance with local regulations and safety standards. Ensure the system is depressurized and de-energized before beginning installation.
- Mounting: The RT116 pressure switch is designed for robust mounting. Securely fasten the unit using appropriate hardware to a stable surface, minimizing vibration.
- Pressure Connection: Connect the pressure switch to the system using the G3/8A interface. Ensure a tight, leak-free connection. Use appropriate sealing materials if necessary.
- Electrical Wiring: The RT116 features a SPDT (Single Pole Double Throw) contact system. Refer to the internal wiring diagram (typically found inside the cover) for correct electrical connections. Ensure all wiring complies with local electrical codes and the unit's IP66 protection rating is maintained.
- Environmental Considerations: Install the switch in an environment that is within its specified operating temperature and humidity ranges. The IP66 rating provides protection against dust and powerful water jets.
4. Operation
The Danfoss RT116 pressure switch operates by sensing pressure changes and activating its electrical contacts when the pressure reaches a predefined setpoint. The unit allows for adjustment of both the cut-in/cut-out pressure and the differential (backlash).
- Setting the Pressure Range: The RT116 has a pressure range of 1-10 bar. Adjust the main setting screw or dial (refer to specific model markings) to set the desired cut-in or cut-out pressure.
- Adjusting the Differential (Backlash): The differential, or backlash, is the difference between the cut-in and cut-out pressure. For the RT116, this range is 0.3-1.3 bar. Adjust the differential setting mechanism to achieve the required pressure hysteresis.
- Testing: After setting, gradually increase or decrease the system pressure to verify that the switch operates correctly at the desired setpoints.
Note: Some models may feature minimum and maximum reset functions, or gold-plated contacts for enhanced reliability in critical applications.
5. Maintenance
Regular maintenance ensures the longevity and accurate operation of your Danfoss RT116 pressure switch.
- Periodic Inspection: Regularly inspect the switch for any signs of physical damage, corrosion, or loose connections.
- Cleaning: Keep the exterior of the switch clean and free from dust, dirt, and debris. Use a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Pressure Connection Check: Periodically check the pressure connection for leaks. Tighten if necessary, but do not overtighten.
- Functional Test: Conduct periodic functional tests to ensure the switch activates at the correct pressure setpoints.
CAUTION: Before performing any maintenance, ensure the system is depressurized and all power to the switch is disconnected to prevent injury or damage.
6. Troubleshooting
If you encounter issues with your Danfoss RT116 pressure switch, consider the following common troubleshooting steps:
- Switch Not Activating:
- Check system pressure: Ensure the pressure is within the switch's operating range and reaching the setpoint.
- Verify wiring: Confirm all electrical connections are secure and correct according to the wiring diagram.
- Inspect contacts: Check for any visible damage or contamination on the electrical contacts.
- Adjust setpoint: Re-verify the pressure and differential settings.
- Erratic Operation:
- Check for vibrations: Excessive vibration can affect switch accuracy. Ensure proper mounting.
- Pressure fluctuations: Rapid or unstable system pressure can cause erratic switching.
- Contamination: Internal contamination might affect diaphragm or bellows movement.
- Leaks at Connection:
- Re-tighten connection: Ensure the G3/8A connection is properly tightened.
- Check sealing: Verify that appropriate sealing materials (e.g., PTFE tape, thread sealant) were used and are intact.
If problems persist after these steps, it is recommended to consult a qualified technician or contact Danfoss support.
7. User Tips
Based on common user experiences, here are a few tips for optimal use:
- Always double-check the pressure and differential settings after any adjustments to ensure they match your system requirements.
- For critical applications, consider using models with gold-plated contacts for enhanced reliability and longer lifespan.
- When replacing an old switch, ensure the new unit's specifications (especially pressure range and connection type) are compatible with your system.
8. Warranty and Support
Danfoss products are manufactured to high-quality standards. For specific warranty information, please refer to the documentation provided with your purchase or visit the official Danfoss website. In case of technical issues or support needs, please contact your local Danfoss representative or authorized service center.
This manual is intended for informational purposes only. Danfoss reserves the right to make changes to its products without prior notice.