10701038 Murphy Temperature Swichgage SDB500

Murphy SDB500 Direct Mounting Temperature Swichgage® For Exhaust Gas Temperature; 100-500°F

The SDB500 is a Direct Mounting Temperature Swichgage instrument used to monitor gas compressor temperatures or engine exhaust temperatures. It is an accurate direct-reading gauge with an adjustable limit switch to activate alarms and/or shutdown. A knob on the front of the instrument 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 SDB500 touches the adjustable contact, a one-wire-to-ground circuit is completed to shut down the equipment and/or actuate audible or visible alarms. Proper relays or Tattletale annunciators (magnetic switches) must be incorporated into the system. The SDB500 has a sand-cast aluminum case with a high-torque bi-metal sensing element in heliarc welded stainless steel bulb. This dual-scale instrument has a temperature range of 100-500°F (40-260°C), with a maximum unit temperature of 625°F (329°C). Use of a thermowell is recommended. Murphy offers thermowells (separable sockets) to facilitate maintenance of a temperature Swichgage and to protect the temperature sensing bulb from extreme amounts of system pressure. Two thermowell options are available: 1/2 NPT and 3/4 NPT.

This product may vary on delivery times, as factories do not guarantee production due to lack of raw materials.

COD: 10701038 Categorie: , Tag:


  • Temperature Ranges: SDB500, SDB500EX and SDB501: 100° to 500°F (40° to 260°C)
  • Sensing Bulb Material and Size: 304 stainless steel; 1/2 in. dia. x 4 in. insertion depth (13 x 102 mm)
  • Maximum Bulb Pressure: 285 psi (1.97 MPa) [19.7 bar] at 625°F (329°C) NOTE: Use of a thermowell is recommended
  • Process Connection: 1/2 NPTF; 3/4 NPT adapter available ; SDB500 : Calibrated without thermowell
  • Sensing Element: High torque bi-metal element in heliarc welded stainless steel bulb
  • Contact Rating: SDB500: 2 A @ 30 VAC
  • Limit Contact Adjustment: By knob through full range
  • Maximum Unit Temperature: SDB500, SDB500EX, SDB501: 625°F (329°C)
  • Case Material: SDB500, SDB1000, SDB500EX: Sand-cast aluminum
  • Accuracy: ± 3% of full scale; NOTE: All models are calibrated for use with a thermowell; Specify when a thermowell is NOT to be used when ordering
  • Wire: 18 AWG (1.0 mm2); See Dimensions for lengths
  • Dial: Black print on stainless steel; Dials are scaled in degrees Fahrenheit and Celsius
  • Approximate Shipping Weight: SDB500: 2 lb. (1.00 kg)
  • Approximate Shipping Dimensions: SDB500: 8-1/4 x 4-1/4 x 4-1/2 in. (210 x 108 x 114 mm)
Dimensions SDB500 SDB500EX and SDB1000

10701038 SDB500 murphy temperature swichgage

Wiring SDB500 SDB501 and SDB1000

10701038 SDB500 murphy temperature swichgage


Informazioni aggiuntive

Peso 1,05 kg



10701038, SDB500