MTH-103E Tachometers

The MTH-103E is a newer version of the MTH-103D. The function, package size and wiring are the same although the MTH-103E has a keypad that replaces the old push button, making programming easier and quicker. This product features a 5- digit tachometer, hour meter, and trip. The trip can be programmed to activate on overspeed, under speed (Class C), or hours. It may be magnetic pickup or DC-powered. CSA-approved Class I, Division 2, Groups A, B, C, and D. When powered by an approved pickup, it is approved Class I, Division 1, Groups A, B, C and D

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  • Selectable overspeed, under speed (Class-C) and hours trip
  • Both signal and power may be derived from magnetic pickup.
  • High accuracy: 5-digit display, 1 rpm resolution,100,000-hour range.
  • Field configurable with front keypad for any number of pulses per revolution, trip point value, and for preset / reset hours.
  • Displays speed, hours, and setpoints on separate screen
  • Displays Alarm Log history
  • Fast overspeed reaction time of 100 msec
  • Backlit display when DC powered
  • Standard SAE case size fits engine panels with 3-3/8″ openings.
  • High shock and vibration resistance.
  • Gasketed and spray proof.
  • Highly resistant to electrical noise.


  • Power: Magnetic pickup or 9 – 30 VDC
  • Display: Alphanumeric LCD
  • Input Signal Frequency: From 10 to 13,000 Hz
  • Minimum required input signal voltage is 4.0 VAC when pickup powered and 1.5 VAC when DC powered
  • Maximum permissible input signal is 15 VACS
  • Tachometer Accuracy: 1 RPM resolution, within 0.2% under all combined environmental conditions
  • Hour meter: 100,000-hour range (99,999), 1-hour increments. Display is visible and time accumulates only when the signal is applied to terminals A and B
  • Trip: Setpoint value is field-settable directly in RPM or hours (counts up or down). Normally open solid-state contacts at terminals 5(+) and 6(–) close on trip.
  • Reaction time of 0.1 seconds. Maximum continuous contact rating of 0.15 amps, 400 VDC
  • Trip Accuracy: ±1 unit, maximum
  • Hour meter Accuracy: 0.2% of reading. Retains count in memory when signal or power is removed.
  • Environment Temperature:
  • Operating: –4 to +158 DegF (–20 to +70 DegC)
  • Storage: –40 to +195 DegF (–40 to +90 DegC)
  • Vibration: Modified MIL-810E (N3)