Danfoss KPS45 Pressure Switch 060-312166

Danfoss KPS45 Heavy-Duty Pressure Switch (060-312166)

The Danfoss KPS45 (Code No. 060-312166) is a marine-type electro-mechanical pressure switch engineered for monitoring, alarm signaling, and regulation in demanding marine engine rooms, hydraulic power units, and heavy industrial plant installations. Featuring a regulating range of 4 to 40 bar and an adjustable differential of 2.2 to 11 bar, this unit converts pressure changes directly into a high-reliability snap-action contact response.

Built with a sea-water-resistant die-cast aluminum enclosure rated to IP67, the KPS45 provides immunity to severe mechanical vibration, thermal cycling, and aggressive ambient atmospheres typical of offshore and shipboard machinery spaces.

Model Details:

• Manufacturer: Danfoss
• Product Series: KPS Heavy Duty Series
• Model Type: KPS 45
• Part / Ordering Number (MPN): 060-312166
• Identical / Alternative Part Code: 060-410666
• EAN Code: 5702423146949

Applications

• Starting Air Vessel Management: Automation of main starting air receiver charging cycles (auto start/stop of 30-bar compressor trains).
• Fuel Oil Booster System Protection: High-pressure monitoring on heavy fuel oil (HFO) and marine diesel oil (MDO) supply manifolds prior to engine rail entry.
• Hydraulic System Overpressure Trip: Fail-safe shutdown on deck machinery and steering gear systems subject to transient pressure spikes.
• Boiler Feedwater High-Pressure Trip: Protection against over-pressurization downstream of multistage centrifugal boiler feed pumps.
• Industrial High-Pressure Washdown & Hydro-demolition Lines: Pressure regulation and dry-run interlock monitoring.

Part Number Cross-References & Equivalent Codes

• Danfoss Part Numbers: 060-312166, 060312166, 060-410666, 060410666
• Model Designation: KPS45 / KPS-45 / Type KPS 45

Chief Engineer Field Tips

• Preventing Pulsation Damage on Positive Displacement Pumps: Never connect the KPS45 directly onto the discharge manifold of a reciprocating pump without an upstream snubber, needle valve, or capillary damping loop. High-frequency pulsations will fatigue the snap-action bellows and chatter the contacts.
• Managing Condensation in Humid Engine Rooms: Always install the switch with the cable gland pointing downwards. Loop the flexible instrument cable downward before entering the gland (drip loop) to stop bilge water or condensed pipeline moisture from migrating into the IP67 terminal chamber.
• PLC Signal Integrity: Because this switch incorporates gold-plated contacts, do not test the contact continuity using a high-voltage megohmmeter (Megger) through the terminals without disconnecting control wiring, as this can flash off the micro-gold coating needed for low-voltage signal transmission.

Frequently Asked Questions

What is the difference between Danfoss KPS 45 and standard Danfoss KPI/KP switches?

Danfoss KP/KPI switches feature an IP30/IP44 sheet-steel casing suited for light industrial, HVAC, or dry cabinet installations. The KPS45 is built specifically for heavy-duty marine service with an IP67 seawater-proof aluminum enclosure, superior vibration resistance and marine classification type-approvals (DNV, LR, ABS).

Can the KPS45 (060-312166) handle high operating temperatures?

The unit accommodates ambient temperatures from -25°C to +70°C (and up to +80°C for short cycles up to 120 minutes). Medium temperatures up to +100°C are permitted at the pressure connection. For steam or high-temperature thermal oil lines exceeding +100°C, a water-filled pigtail syphon must be fitted upstream.

Is the differential fixed or adjustable on the 060-312166 model?

The differential on the 060-312166 is fully adjustable from 2.2 bar to 11 bar across the 4 to 40 bar span. This enables fine-tuning between the system start and stop commands without short-cycling pumps or compressors.

Does the switch reset automatically or manually?

The 060-312166 features an automatic reset mechanism. When the line pressure drops below the setpoint minus the differential, the SPDT contact snaps back to its starting state without manual intervention.

How do I maintain the IP67 ingress protection rating during cable installation?

Use a round outer-sheath marine cable with a diameter matched to the Pg 13.5 gland (typically 6 to 12 mm OD). Ensure the gland rubber compression ring is evenly torqued and that the cover gasket is seated flat in its groove before tightening the housing screws.