LIMIT SWITCHES Clause Samples

LIMIT SWITCHES. Valves equipped with limit switches: 1. Designed to determine fully open to fully closed position, securely attached to check valve and

LIMIT SWITCHES. The actuator shall have two limit switches which shall be directly geared to the output shaft of the actuator without any slippage clutch device. One limit switch shall be for the open end position and the other limit switch for the close end position. The limit and torque switches shall be independent of one another. The limit switches shall be set up to trip the actuator before the actuator torque limit switches are activated. The limit switches shall be adjustable, allowing adjustment to the travelling gate/valve shaft. Adjustment of the limit switches must be possible without opening or removing covers. The addition of switches must be possible without opening the lubricated main gear case. The limit switches must be driven by a self-lubricated counter gear drive designed for high repeatability and easy adjustment.

LIMIT SWITCHES. Limit switches shall be metal encapsulated precision switches with robust and compact explosion-proof structures. Cables shall be equipped with a strain-relief device and safely cast into the enclosure. Switches shall have bottom, side or lateral cable outlets as per the requirement of the application. The integrated basic switch shall have a single-pole changeover contact with a high switching accuracy and a precise repeatability of the switching point. It shall have high vibration resistance and long mechanical life. It shall have a high protection class that would allow the switch to be used in all processes of JW wastewater treatment plants. The limit switch shall meet the following minimum requirements: • -20 °C to +90 °C • External Ex terminals

LIMIT SWITCHES. Valves shall be equipped with limit switches designed and installed to determine if the valve disc is fully closed and not fully closed. Limit switches shall be heavy-duty, snap action, over-center switch mechanisms contained in a die cast metallic NEMA 4X enclosure with chemical resistant Viton gaskets and seals. Switches shall include one normally-open and one normally-closed fine silver contacts rated NEMA A600, 120 VAC, 10 amp continuous with wiping action operation. Contacts shall be replaceable without disconnecting external wiring. Wiring terminals shall accommodate AWG #22-12 stranded copper wire and shall be identified on a permanently attached nameplate.

LIMIT SWITCHES a. All moving-head position limit switches interface directly to the DCS. b. All ultimate-end limit switches interface directly to the relevant switchgear. c. All limit switches are of the magnetic or proxy type and are supplied and installed with striker plates. d. All limit switches and striker plates are installed 1 meter above walkways adjacent to chutes to prevent the devices from being buried under coal when a spillage occurs or being damaged due to maintenance and cleaning activities.

LIMIT SWITCHES. Enclosed in a NEMA 7 explosion-proof case and of rotary type positively coupled to the actuator.