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Thermo Scientific™ Ramsey™ SAS Snap Action Safety Pull Switch for Conveyors

Thermo Scientific™ Ramsey™ Conveyor protection switches monitor your conveyors, equipment, and processes. Using our conveyor protection switches to prevent accidents, protect equipment, and reduce unscheduled shutdowns helps to keep your profits and production at their highest levels. Thermo Scientific Ramsey conveyor protection switches are used for position information, control signals, and to identify potentially hazardous situations with your process equipment. When hazardous situations occur they activate alarms to stop your equipment. This keeps your personnel safe and limits damage to your equipment. The Thermo Scientific Ramsey Snap Action Switch (S.A.S.) was specifically designed to function as a Slack/Broken Cable type Pull Cord but without the false trips associated with the effects of weather conditions such as temperature variations affecting the cables, ice, snow, wind and vibration.

Additional Information

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Conveyor Protection

Documentation

Product Description

Thermo Scientific™ Ramsey™ Snap Action Switch (S.A.S.) was specifically designed to function as Slack/Broken Cable type Pull Cord but without the false trips associated with the effects of weather conditions such as temperature variations affecting the cables, ice, snow, wind and vibration. The Thermo Ramsey model SAS Snap Action Safety pull cord is a two-sided cable pull emergency stop switch. In addition, it is designed to ensure that should the cable become slack or is accidentally cut, the switch will activate so as to be repaired to normal functionality.

 

Features

• Satisfies OSHA, MSHA & CSA Push-Pull operating requirements• Snap Action Design

• Opposing cable design eliminates false trips due to temperature variations

• Positive-opening NC contacts

• Self-cleaning microswitch contacts

• -40°C to +80°operating temperature

• Superior drawbar spring design is easy to install

• Rugged, Corrosion-resistant, die-cast aluminum enclosure

• Optional Addressable Module• Optional Activation Flag

• Optional 4 microswitch mode

How it works

Pre-tensioned springs are installed at the extremity of each side of the pull cord cable run. Cable tension is kept equal on both sides. In normal operation, should an emergency present itself, the cable is pulled in any direction and the pull cord switch’s arm rotates clockwise or counter-clockwise thus activating the micro switches in order to alarm? If the cable breaks or becomes slack, the opposing pre-tensioned spring pulls the arm in that direction. The contact behaviour for a cable that has broken is the same as pulling the cable. Cable lengths are kept equal on opposite sides of the Pull Cord switch. This is particularly suitable to installations prone to wide temperature changes minimizing nuisance trips or stops associated with the coefficient of expansion characteristics of actuation cables. The snap-action design uses a two-step function. The switch arm must be pulled to a locked position. As a second step, an internal linkage then permits the spring-loaded cam to fully rotate ensuring that both micro switches are activated together. This ensures that partial arm rotation due to temperature changes; snow, ice or wind effects on the cable cannot activate one micro switch and not the other.

 

 

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