Murphy at

The AT Series tachometers are rugged, transistorized instruments with solid-state circuitry for indication of engine RPM. They are equipped with a bracket for mounting into a standard 3- 3/8 in. (86 mm) dash mounting hole. A full 270° sweep of the pointer gives an accurate indication on a large easy–to–read scale and the dial can be illuminated for night reading. The ATH Series models are also equipped with hourmeter to record the elapsed running time of an engine.

Features
• 4000 RPM – 0 to 100,000 hours
• Sensing from Magnetic Sensor, Battery Charging Alternator or Ignition Signal
• High Visibility Analog Readout
• Air Core Movement
• Easy Calibration through Dip Switches
• Through Dial Lighting
• Powered by 11-28 VDC Battery Available

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Power Supply: Voltage: 8-30 VDC. Maximum Current: 150 mA.

Frequency Signal: (Voltage, Magnetic Pickup Signal Models):

  • Minimum: 0.35 Vrms.
  • Maximum: 60 Vrms.

Maximum Current, Magnetic Pickup Signal Models: 4.8 µA.
Adjustment Range, Magnetic Pickup Signal Models:

  • Crank Disconnect: 250-6,000 Hz.
  • Overspeed: 1,100-10,000 Hz.

Reset Differential, Magnetic Pickup Signal Models:

  • Crank Disconnect: Dropout 160 Hz ± 5%.
  • Overspeed: 200 Hz Differential.

Output: Relay Contact, SPDT, Resistive Load: (2) 5 A 30 VDC.

Adjustment: (2) 270°–turn potentiometer.

Temperature Range: 14 to 158°F (-10 to 70°C).

Shipping Weight: 2 lbs. (0.90 Kg).

Shipping Dimensions: 10 x 9 x 6 in. (254 x 229 x 152 mm).

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Palmer Johnson is an authorized distributor and service provider for Murphy by Enovation products.

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