Product details
Danfoss MP55A Oil Differential Pressure Switch | For Ammonia (R717) | 90s Time Relay |
Product Description:
The Danfoss MP55A (060B018391) is a specialized safety device essential for protecting high-value compressors in UAE industrial refrigeration and chemical processing plants. Designed for Ammonia (R717) compatibility, it features high-grade stainless steel bellows to prevent corrosion. The device monitors the pressure difference between the oil pump discharge and the compressor crankcase. Its integrated 90-second thermal time relay is specifically chosen for systems that experience longer start-up periods or transient oil pressure dips. If the differential pressure remains below the setpoint for more than 90 seconds, the switch cuts power to the compressor, preventing mechanical seizure while minimizing nuisance trips caused by the heavy load fluctuations common in Dubai’s extreme heat.
Key Features & Benefits:
- Extended 90-Second Delay: Offers a longer safety window to prevent false trips during long compressor start-up cycles in the UAE.
- Ammonia (R717) Ready: Features robust stainless steel bellows and connections designed to withstand corrosive refrigerants used in Dubai ice plants.
- Precision Oil Monitoring: Ensures the differential pressure (range 0.3 to 4.5 bar) is always sufficient to lubricate critical moving parts.
- Manual Reset Safety: Requires a physical inspection and manual reset by a UAE technician after a trip, ensuring root causes are addressed.
- Rugged Industrial Housing: Built to perform reliably under the constant vibrations and high ambient temperatures of Middle Eastern plant rooms.
Technical Specifications :
| Specifications | Value |
| Manufacturer | Danfoss |
| Product Model | MP55A |
| Code Number | 060B018391 |
| Differential Range | 0.3 bar to 4.5 bar |
| Time Delay Relay | 90 Seconds |
| Refrigerant Compatibility | R717 (Ammonia), HCFC, non-flammable HFC |
| Supply Voltage | 230V or 115V AC (Check specific wiring) |
| Max. Working Pressure | 17.0 bar |
FAQs:
- Q: When should I choose the 90s delay over the 45s model in Dubai?
- A: Use the 90s delay (060B018391) for larger compressors or systems with long oil lines where it takes more time for the oil pressure to build up to its operating level in the UAE.
- Q: Is it safe for all fluorinated refrigerants?
- A: Yes, the “A” version with stainless steel bellows is highly durable and compatible with both Ammonia and standard HFC/HCFC refrigerants used in the UAE.
- Q: Can this switch be mounted in any orientation?
- A: It is recommended to mount the MP55A with the bellows facing downwards to prevent oil and debris from collecting inside the sensing elements in UAE installations.
