Frank W. Murphy Direct Mount Temperature Swichgages® 100-500° F Without Thermowell

• The SDB Series are direct-mounting Temperature Swichgage devices.
• They provide an accurate direct-reading gauge with an adjustable limit switch to activate
alarms and/or shutdown.
• A knob on front of the Swichgage allows you to adjust the limit switch trip point.
• Pointer movement is actuated by a bi-metallic sensing element.
• When the indicating pointer on the SDB touches the adjustable contact, a one-wire-to-ground
circuit is completed to shut down the equipment and/or actuate audible or visual alarms.
• When the temperature rises to the preset trip point, the pointer engages an internal SPDT
snap-switch to close/open circuits.
• The most common use of the SDB Series is to monitor gas compressor temperatures.
• Engine exhaust temperature can also be monitored to indicate overloading or lean fuel
mixtures; or use the SDB to help coordinate loads on twin-engine installations.