Delta Controls Temperature Switch, 700 Series
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700 Series Temperature Switch

Brand: Delta Mobrey
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Delta Controls Temperature Switch, 700 Series
The models 721/2/3, 731/2/3/4, 771/2/3/4, 781 Performance Series temperature switches comprise an armoured capillary or rigid stem thermal system upon which a compression gland slides to enable various depths of thermowell (pocket) to be
accommodated. 

This sensor is coupled to the microswitch via a precision stainless steel mechanism, the combination of which helps deliver the market leading performance customers can expect from the Series.
Features
  • Precision stainless steel mechanism for arduous atmospheres and high humidity
  • Set point adjustable over whole range against calibrated scale with tamperproof adjuster
  • Weatherproof and Flameproof models ATEX and IEC Ex
  • Hermetically sealed microswitch option
  • Models for fixed switching differential, adjustable differential and HI-LO operation
  • Ranges available up to 230° to 300° C (450° to 580° F). Maximum working temperature up to 310° C (600° F)

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Specifications

Brand

Adjustment Type

  • Field Adjustable Set Point

Ambient Temperature Range

  • -25° to 60° C (-13° to 140° F)

Applications

  • Chemical Industry
  • Food Industry
  • Oil & Gas Applications
  • Petrochemical
  • Power
  • Refining

Approvals & Certifications

  • ISO 9001
  • UKAS

Approvals & Certifications

  • ATEX
  • BSI Kitemark
  • CE
  • CSA
  • Ex II 2 GD
  • IEC Ex: Ex db IIC T4 & T6 Gb
  • LVD 2014/35/EU

Cable Entry

  • 1/2” NPT Female
  • 3/4” NPT Female
  • Cable Gland & Back Nut: M20
  • M20 x 1.5

Capillary Length

  • 10 to 20 feet (3 to 6 metres)

Conduit Connection

  • 3/4” Conduit

Diameter

  • Bulb: 0.47” (12 mm)

Electrical - Free Leads

  • 14 AWG, 2.5 mm²

Electrical Connectors

  • Terminal Block

Electrical Contacts

  • Gold Alloy Contacts for Low Voltage Switching
  • Gold-Plated Silver

Electrical Rating

  • CSA & IEC: 1 A at 125 Vac - Models 721/3, 731/3/4, 771/3/4 & 781
  • CSA: 1 A at 30 Vac/dc - Models 721, 731/4, 771/4 & 781
  • CSA: 100 mA at 30 Vdc - Models 721/3, 731/3/4, 771/3/4 & 781
  • CSA: 2 A at 30 Vdc - Models 721/2/3, 731/2/3/4, 771/2/3/4 & 781
  • CSA: 5 A at 110/250 Vac - Models 721/2/3, 731/2/3/4, 771/2/3/4 & 781
  • CSA: 5 A at 30 Vdc - Models 721, 731/4, 771/4 & 781
  • IEC 947-5-1 / EN 60947-5-1: 0.22 / 0.1 A at 125/250 Vdc - Models 721/2 / 3, 731/2 / 3 / 4, 771/2 / 3 / 4 & 781
  • IEC 947-5-1 / EN 60947-5-1: 0.3 A at 120 Vac - Models 721, 731/4, 771/4 & 781
  • IEC 947-5-1 / EN 60947-5-1: 0.6 / 0.3 A at 120/240 Vac - Models 721/2 / 3, 731/2 / 3 / 4, 771/2 / 3 / 4 & 781

Enclosure Finish

  • Light Gray Epoxy Resin Paint

Enclosure, Body Material

  • Flameproof: Die Cast Aluminum-silicon Alloy
  • Flameproof: Sand Cast in Grey Iron
  • Weatherproof & Exn: Austenitic Stainless Steel
  • Weatherproof & Exn: Die Cast Zinc Alloy

Environmental Protection

  • Flameproof Ex d
  • Intrinsically Safe
  • IP66
  • NEMA 4
  • NEMA 4X
  • Weatherproof

Insertion 'U' Length

  • 5.9” (150 mm)

Length

  • Bulb: 3.2” (80 mm) - Models 721-3, 731-4 & 781
  • Bulb: 5.51” (140 mm) - Models 771-4

Materials of Construction

  • Armour: 316 Stainless Steel
  • Bellows & Mounting Bracket: Stainless Steel
  • Bellows: Brass
  • Thermal System with Capillary Sensing Bulb: 300 Series Stainless Steel

Mounting

  • 2” Pipe Mounting Bracket
  • Direct Mounting, 1/2” NPT External to Rigid Stem

Mounting Position

  • Vertical

NPT Connection

  • 1/2”-14 Male NPT
  • 3/8” NPT Female
  • 3/8”-18 NPT Male

Operating Pressure

  • Thermowell: Max. 100 bar (1,500 psi)

Operating Temperature

  • 0° to 310° C (32° to 600° F) - Max.

Repeatability

  • Set Point Repeatability: ± 0.5 % of Span at 20° C (68° F) Ambient

Sensor, Probe Length

  • Probe: 7.53” (191.5 mm)

Sensor, Probe Material

  • 316 Stainless Steel

Service

  • Oxygen Service

Set Point - Decreasing

  • -50° to 300° C (-50° to 580° F)

Set Point - Increasing

  • -50° to 300° C (-50° to 580° F)

Stem Length

  • Semi-Rigid Stem: 10” to 20” (250 to 500 mm)

Stem Material

  • Stainless Steel

Storage Temperature

  • -25° to 60° C (-13° to 140° F)

Switch Type

  • DPDT Hermetically Sealed & Snap-Action Microswitch
  • SPDT Hermetically Sealed & Snap-Action Microswitch

Thermowell

  • 316 Stainless Steel

Voltage

  • Impulse to Withstand Voltage Across Contacts: 0.5 kV - Models 721, 731/4, 771/4 & 781
  • Impulse to Withstand Voltage Across Contacts: 0.8 kV - Models 721/2/3, 731/2/3/4, 771/2/3/4 & 781
  • Insulation Voltage: 125 V - Models 721, 731/4, 771/4 & 781
  • Insulation Voltage: 250 V - Models 721/2/3, 731/2/3/4, 771/2/3/4 & 781
  • Withstand Voltage: 1.2 kV - Micro Switch
  • Withstand Voltage: 2 kV between Live Parts & Earth/Ground
  • Withstand Voltage: 500 V between Open Contacts

  • Oil & Gas
  • Chemical
  • Petrochemical
  • Refining
  • Power
  • Food Industry

Documentation

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