Murphy Temperature SWICHGAGE A20 Series manual

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Table of contents for the manual

  • Page 1

    Bulletin AT-95026B page 1 of 4 2 and 2-1/2 in. (51 and 64 mm) Dial ■ Corrosion Resistant Polycarbonate Case ■ Indicating Gage and Limit Switch ■ Switch Can Activate Alarms and/or Shut Down Equipment ■ Critical/High T emperature Limit Switch Is V isible and Adjustable (Most Models) ■ Contact(s) Isolated From Ground Description The A20 Seri[...]

  • Page 2

    Bulletin AT-95026B page 2 of 4 2-1/4 in. (57 mm) 2-1/2 in. (64 mm) 2-29/32 in. (74 mm) 2-1/2 in. (64 mm) 1-11/32 in. (34 mm) 2-11/16 in. (68 mm) Mounting hole dia. 1-27/64 in. (36 mm) 2-1/16 in. (53 mm) Mounting hole dia. Mounting Clamp Mounting Clamp °C TEMPERATURE 1-1/2 in. (38 mm) 1/2 NPT M U R P H Y S W I C H G A G E ® Contact Adjustment 1/16[...]

  • Page 3

    Bulletin AT-95026B page 3 of 4 Pre-Alarm Using A20/A25T ABS T ypical Inter nal Wiring Diagrams The A20TABS and A25TABS features a standard limit contact for equipment shutdown on high temperature. It also has an internal SPDT snap-switch to sig- nal an alarm before shutting down. When the snap-switch trips (preset point), on rising temperature, the[...]

  • Page 4

    Bulletin AT-95026B page 4 of 4 How to Order T o order , use the diagram below . List options in ascending alphabetical order (A-Z). Example: A20T -B1-250-4. Range †† Base Model A20T A20TL A20TO A20TE A20TABS A20TB A20TH ____ – ____ – ____ – ____ – ____ Single scale (°C) 70C = 0-70°C 100C = 45-100°C 120C = 50-120°C 140C = 60-140°C 1[...]