37000 - General Purpose Pressure Switch

Product catalog summary

Overview
The 37000 Series pressure switches are versatile and reliable devices designed for controlling pressurized systems up to 450 lbf/in² (30 bar). They are suitable for use with fluorinated refrigerants, air, and water, and feature adjustable range and differential settings, dual scales, and options for automatic or manual reset.

Applications
These pressure switches are applicable in various systems including refrigeration plants, water systems, air compressors, pressurized central heating systems, beverage dispensers, and process control.

Physical Description
The switches are compact and robust, consisting of a case, a pressure unit, and a switch. The pressure unit features a seamless brass bellows, and a restrictor is included to minimize pump pulsations. The switch is a single pole changeover type, allowing for make on rise or break on rise configurations. The cable entry supports a 16mm cable gland.

Operation
Settings for range and differential (in automatic reset versions) are adjusted via screws at the top of the unit. Electrical connections are made through three terminals: terminal 1 (common), terminal 3 (make on rise), and terminal 5 (break on rise). The switch changes over from terminal 5 to terminal 3 when the pressure reaches the set point and reverts when the pressure falls below the set point minus the differential.

Technical Specifications

Switch Type: Single Pole Double Throw
Rated Voltage: 125/250V AC
Non-inductive Current: 12A
Inductive Current Full Load: 10A

Models and Mounting
The 37000 Series includes various models with different range and differential settings. They come with a standard mounting bracket. Some models have a restrictor orifice to reduce transient pressure surges.

Media and Temperature
The switches are suitable for media temperatures ranging from -10°C to 120°C. They are compatible with fluorinated refrigerants, air, and water.

Weight
Auto reset models weigh approximately 313g, while manual reset models weigh around 300g.

Contact Information
Teddington Appliance Controls Ltd, Holmbush, St. Austell, Cornwall, United Kingdom, PL23 3HG. Tel: +44 (0) 1726 74400, Fax: +44 (0) 1726 67953, Website: www.tedcon.com, Email: [email protected]

Catalog excerpts

37000 - General Purpose Pressure Switch-1

Versatile and Reliable. Adjustable Range and Differential Settings. For use with Fluorinated Refrigerants, Air and Water. Dual Scales. Automatic or Manual Reset Versions. Compact Size.Application The 37000 Series has been designed for the control of pressurised systems up to 450lbf/in (30bar). Applicationsinclude refrigeration plant, water systems, air compressors, pressurised central heating systems, beverage dispensers and process control. > 2 Operation Physical Description The 37000 range of pressure switches are versatile and robust, with easily adjustable range and differential settings (The differential can be adjusted independently of the range setting). The pressure switches are made up of three elements, the case, the pressure unit and the switch.The pressure unit is a seamless brass bellows used on refrigeration or pressurised heating system applications.A restrictor is incorporated into the pressure element to minimise the effect of pump pulsations. The switch is a single pole change over switch that enables wiring for make on rise or break on rise. Automatic and manual reset versions are also available.The cable entry is suitable for a 16mm cable gland. The range and the differential (Automatic Reset Versions)are set using the adjustment screws at the top of the unit before being locked in position. Electrical connection is via three clamp down type terminals, terminal 1 common, terminal 3 make on rise and terminal 5 break on rise. The switch will change over from terminal 5 to terminal 3 when the system pressure reaches the range set point. The switch will not change back until the pressure has fallen to the range value less the differential value. E.g. If the range setting is 2.5bar and the differential setting is 0.5bar, the switch will change over when the pressure has risen to 2.5bar and will not change back until the pressure has fallen below 2.0bar. >

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37000 - General Purpose Pressure Switch-2

Model№Range (bar)Differential (bar) Min.Max.Min.Max.37001-0.760.64 > Restrictor 16.5 > Manual Reset(3 bar fixed) 3700382425 16.537004-0.730.21.5 > 16.516.5ܔ BSPܔ Flare & CapillaryMax. Over Pressure37002-0.76 > 2422.5 25 0.280 ѱ 0.2 AUTO RESETDiffAdjust ScrewPressureAdjust Screw 4 M4 x 0.7 Bracket 36 ر 0.22.520 0.220.562.525ѱ 0.2 (All dimensions in mm unless shown otherwise) 08/08

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