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400 Series Type H400 Models 270 & 274 Pressure Switch
Brand: United Electric Controls Ltd.
The 400 Series is a versatile family of vacuum, pressure, differential pressure and temperature switches for applications that require single or multiple switching capabilities. Dual and triple switch versions provide multi-output for alarm and shutdown, pre-alarm and alarm, high/low limit or level staging functions. A wide variety of microswitch and process connection options, along with a weather-tight enclosure, make the 400 Series an ideal choice for most ordinary location applications. Its worldwide use is assured with approvals and certifications to agency standards. Widely used throughout the process industries, the 400 Series provides threshold protection and control for many critical functions. Typical installations are found in industrial gas production, energy generation including pumps, turbines and compressors, pulp and paper, and water and wastewater treatment.
Features• Epoxy-coated enclosure designed to meet enclosure Type 4X • Wide variety of pressure sensors and materials • Setting via reference dial or hex screw adjustment • FM Approved
Specifications
Adjustment Type
- Captive Clamp Screws
- Factory Set (Pre-Set)
- Set Point Adjustment
Ambient Temperature Range
- -40° to 71° C (-40° to 160° F), Set Point Typically Shifts less than 1% of Range for a 28° C (50° F) Ambient Temperature Change
Applications
- Energy Generation Including Pumps
- Industrial Gas Production
- Pulp & Paper
- Turbines & Compressors
- Water & Wastewater Treatment
Approvals & Certifications
- ATEX Directive (94/9/EC) II 1 G EEx Ia IIC T6 Tamb: -50° to 60° C (-58° to 140° F)
- CE
- CSA C22.2 No. 14, File # E42272
- FM Class 3545
- GOST-R 51330.0, 51330.1, 51330.10 & 51330.14
- Low Voltage Directive (LVD) 2006/95/EC
- PED: 97/23/EC
- UL (C,US) 508
Approvals & Certifications
- ISO 9001
Deadband
- psi: 1.5 to 10 (kPa: 10.3 to 68.9, bar: 0.1 to 0.7)
Electrical Connectors
- 7/8" Hole to 1/2" NPT Female Watertight Conduit Fitting
- One 3/4" NPT
- Screw Terminal
- Two 7/8" Diameter Knockouts
Electrical Contacts
- Gold Contacts, 1 A at 125 Vac Resistive
- Normally Closed
- Normally Open
Electrical Rating
- 1 A at 125 Vac Resistive
- 10 A at 125 Vdc Resistive, Deadband & Minimum Set Point will Increase
- 20 A, 125/250/480 Vac Resistive
- Close Deadband, 5 A at 125/250 Vac Resistive
- External Manual Reset, High Ambient, 15 A at 125/250/480 Vac Resistive, Temperatures up to 145° C (250° F)
- Vapor Sealed, Fungus Resistant Case,15 A 125/250 Vac Resistive
Enclosure Finish
- Epoxy Powder-Coated
Enclosure, Body Material
- Gasketed Die Cast Aluminum
Environmental Protection
- Intrinsically Safe
- IP66
- NEMA 4X
- Weathertight
Indication
- Single Red Status Light, 115 Vac
Mounting
- Hole
- Pipe
- Surface
Name Plate, Tag Material
- Stainless Steel, Paper ID Tag & Wire Attachment
NPT Connection
- 1/4" NPT Female
Process Connection Material
- Brass
- Phosphor Bronze Bellows with Nickel-Plated Brass Pressure Connection
Proof Pressure
- psi: 250 to 350 (kPa: 1,724 to 2,413, bar: 17.2 to 24.1)
Repeatability
- Set Point Repeatability: ± 2% of Full Scale
Service
- Oxygen Service Cleaning, Alcohol Cleaning to Remove Residue from the Process Connection
Set Point - Decreasing
- bar: 0 to 20.7
- kPa: 0 to 2,068
- psi: 0 to 300
Set Point - Increasing
- bar: 0 to 20.7
- kPa: 0 to 2,068
- psi: 0 to 300
Shock
- Set Point Repeats after 15 G, 10 millisecond Duration
Storage Temperature
- -54° to 71° C (-65° to 160° F)
Switch Type
- DPDT Switch, 10 A at 125/250 Vac Resistive, Deadband & Minimum Set Point will Increase
- SPDT
System Pressure
- bar: 20.68
- kPa: 2,068
- psi: 300
Vibration
- Set Point Repeats after 2.5 G, 5 to 500 Hz
Window Material
- Gasketed Lexan Window
