Danfoss Pressure Switch and Thermostat, KP, KPI
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KP / KPI Pressure Switch & Thermostat

Brand: Danfoss
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The KP and KPI pressure switches and thermostats are used for control, monitoring and alarm systems in a wide variety of industry applications.

KP pressure switches are mainly used for gaseous fluid whereas KPI pressure switches are more for liquid and gaseous fluid. 

The KP pressure range include special designed pressure switches and limiters for steam boilers and other heating applications.

For water pump control and protection (dry run) the dual pressure switch KP44 is suitable and secure improved life time of the water pump.
Features
  • Wide setting range
  • Shock and impact resistant
  • Snap action electrical contacts minimize chatter, bounce, and wear, and ensure long term electrical and mechanical reliability
  • Small dimensions. Space saving – easy to install in panels
  • Electrical connection from front of the unit makes rack mounting easier and also saves space
  • Suitable for alternating current and direct current 
  • Single pressure switches and thermostats are fitted with a single pole double throw contact system (SPDT) 
  • Can be used for both liquids and gases (KPI) 
  • Manual trip function enables electrical connections verification without any tools or pressure changes in the application 
  • Versions with automatic and manual reset available

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Specifications

Brand

Ambient Temperature Range

  • -40° to 65° C (-40° to 149° F)

Approvals & Certifications

  • EN 60947-1
  • EN 60947-4-1
  • EN 60947-5-1
  • CCC
  • CE-Marked in Accordance with LVD 2006/95/EC
  • GOST
  • UL

BSP Connection

  • G 1/2” A Male
  • G 1/4” A Male

Cable Entry

  • PG13.5 with Special Nut for 6 -14 mm Diameter Cables - Screwed
  • PG16 for 8-16 mm Diameter Cables
  • Rubber Cable Gland, 6 to 14 mm Diameter Cables

Capillary Length

  • 6.56 to 16.4 feet (2 to 5 metres)

Diameter

  • 0.37” (9.6 mm) - Sensor Pocket Internal Diameter
  • 0.43” (11 mm) - Sensor Pocket External Diameter

Differential Pressure

  • psi: 1.45 to 87.02 (kPa: 10 to 600, bar: 0.1 to 6)

Electrical Connectors

  • Terminal Connection

Electrical Rating

  • Contact Load, Silver: 10 A at 400 V (AC-15) for KP 35, KP 36 & KP 34, KP 35, KP 36, KP 37 Boiler Version
  • Contact Load, Silver: 10 A at 440 V (AC-1) for KPI 35, KPI 36, KPI 38
  • Contact Load, Silver: 12 W at 220 V (DC-13) for KP 35, KP 36, KPI 35, KPI 36, KPI 38 & KP 34, KP 35, KP 36, KP 37 Boiler Version
  • Contact Load, Silver: 16 A at 400 V (AC-1, AC-3) for KP 35, KP 36 & KP 34, KP 35, KP 36, KP 37 Boiler Version
  • Contact Load, Silver: 4 A at 440 V (AC-15) for KPI 35, KPI 36, KPI 38
  • Contact Load, Silver: 6 A at 440 V (AC-3) for KPI 35, KPI 36, KPI 38

Environmental Protection

  • IP22
  • IP30 - Unit Must be Mounted on a Flat Surface / A Flat Fitting & All Unused Holes Covered
  • IP44 - Mounted as IP30 Plus Fitting of Top Cover
  • IP55 - Unit Mounted in a Special IP55 Enclosure

Fluid

  • Fresh Water - for Dual Pressure Switch
  • Liquid - for KPI 35, KPI 36 & KPI 38, KP 34, KP 35, KP 36, KP 37 Boiler Version

Housing Style

  • Flat Surface

Materials of Construction

  • Copper Tin Alloy for Dual Pressure Switch - Bellows
  • Free-Cutting Steel (Nickel-Plated) for KP 35, KP 36, KPI 38, KP 34, KP 35, KP 36, KP 37 Boiler Version & Dual Pressure Switch - Pressure Connector
  • Gold - Contact Material
  • Gold-Plated - Contact Material
  • Phosphor Bronze for KP 35, KP 36, KPI 35, KPI 36, KPI 38 & Dual Pressure Switch - Bellows
  • Polyethylene - Protective Cap
  • Silver - Contact Material
  • Stainless Steel for KP 35, KP 36 & KP 34, KP 35, KP 36, KP 37 Boiler Version - Bellows

Media

  • Air - for KP 34, KP 35, KP 36, KP 37 Boiler Version
  • Gas - for KP 35, KP 36 KPI 35, KPI 36 & KPI 38, KP 34, KP 35, KP 36, KP 37 Boiler Version
  • Steam - for KP 34, KP 35, KP 36, KP 37 Boiler Version

Mounting

  • Angle Mounting Bracket for KP
  • Wall Mounting Bracket for KP

Operating Pressure

  • psi: 246.6 to 435.1 (kPa: 1,700 to 3,000, bar: 17 to 30) - Permissible

Process Temperature

  • -40° to 100° C (-40° to 212° F)

Proof Pressure

  • Maximum

Sensor / Probe Material

  • Tinned Copper Cu/Sn5

Set Point - Decreasing

  • 0° to 150° C (32° to 302° F) - Thermostat, Typicals KP 75 to KP 81
  • bar: -0.2 to 28
  • kPa: -20 to 2,800
  • psi: -2.90 to 406.1

Set Point - Increasing

  • 0° to 150° C (32° to 302° F) - Thermostat, Typicals KP 75 to KP 81
  • bar: -0.2 to 28
  • kPa: -20 to 2,800
  • psi: -2.90 to 406.1

Switch Type

  • SPDT

Vibration

  • 0 to 1,000 Hz at 4 G (1 G = 9.81 m/sec²)

Documentation

Data Sheets

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