Delta Mobrey 771 Series Temperature Switch

Description

Delta Mobrey 771 Series Temperature Switch comprises an armored capillary attached to the sensing bulb via a semi-rigid extension on 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.

Designed in the mid-1970s and developed over subsequent years, the Performance Series switch range offers users the broadest range of options, the highest levels of set-point repeatability and the confidence of long term performance that a mature product such as this can prove. The model 771 Vapour Pressure Temperature Switch has a flexible thermal system and is suitable for setpoints between -50°C and 150°C with maximum working temperatures up to 250°C.

Ranges available up to 150°C
Weatherproof IP66 enclosures in zinc alloy or stainless steel
ATEX and IECEx Ex d Flameproof models available
Environmentally and Hermetically sealed switch options
Set-point adjustable over the full range against a calibrated scale with tamperproof adjuster

Delta Mobrey 771 Series Features:

Precision stainless steel mechanism for arduous atmospheres and high humidity.
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).

Application:

The 771 Performance Series is suitable for a wide range of applications in:

Oil & Gas
Chemical
Petrochemical
Refining
Power
Food Industry

The choice of models available ensures that the 771 Performance Series is suitable for use in:

Corrosive atmospheres
Resistant to chemical attack

Specification:

Accuracy:

Set point repeatability ± 0.5% of span at 20°C / 68°F ambient.
Scale accuracy ± 2% of full scale.

Storage Temperature: -25 to +60°C / -13 to +140°F

Ambient Temperature: -25 to +60°C / -13 to +140°F

Maximum Working Pressure: System sensing probes for both the capillary and rigid stem version are designed to withstand 100 bar (1500psi) without thermowell.

Enclosure classification: IP66 / NEMA 4X / Flameproof Ex d

Switch output:

SPDT or DPDT snap action microswitch (standard)
Hermetically sealed (optional)

Process Connection: 3/8 NPT External Sliding Gland, ½ NPT External Direct mounting. Approximate Weight: Enclosures: “W & N” 2.5kg / 5.5lb (models 731-4 2.2kg/4.8lb); “A & O” 3.5kg /7.7lb (models 731-4 3.2kg/7.0lb); “H” 4.0kg/8.8lb; “K” 8.7kg/19.1lb

Download Data Sheet: Temperature Switch 771 Series

Reference: delta-mobrey.com