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700 Series Temperature Switch
Brand: Delta Mobrey
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)
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
