MTH6 Speed/Time Sensors

This microprocessor-based digital tachometer and hourmeter with a built-in overspeed switch is highly accurate and dependable. It measures speed and running hours and can give an alarm or shut down the engine on overspeed.

The MTH6 case is polycarbonate, and its dial measures 3-1/2 in. (89 mm) in diameter.

RPM data for the tachometer and overspeed switch is supplied by a magnetic pickup or battery charging alternator. The magnetic pickup is installed into the flywheel housing of an internal combustion engine. The starter ring gear acts upon the magnetic pickup to generate a voltage pulse each time a gear tooth passes the end of the sensor.

• Tachometer and Hourmeter With Overspeed Shutdown or Alarm Switch
• 3-1/2 Inches (89 mm) Diameter Dial
• Reads RPM Data from a Magnetic Pickup or Battery Charging Alternator
• Powered by 8 to 40 VDC
• Large 5-Digit LCD Display
• Maintains Hours Count When Power Is Lost
• Front Panel Programming
• Hours Can Be Reset to Zero

  • Notes

    Power Requirements: 8-40 VDC (12, 24 or 32 VDC systems).

    Maximum Current:

    • 12 VDC: 0.011 A, backlight Off; 0.025 A, backlight On.
    • 24 VDC: 0.008 A, backlight Off; 0.015 A, backlight On.
    • 32 VDC: 0.007 A, backlight Off; 0.010 A, backlight On.

    Operating Temperature: -4° to 158°F (-20° to 70°C).

    Storage Temperature: -40° to 185°F (-40° to 85°C).

    Case: 1018 Polycarbonate/Polyester blend.

    Mounting Hole Dimensions: 3-3/8 in. (86 mm) Dia.

    Speed Input: 4.5 Vrms minimum.

    Overspeed Switch Rating: 2 A, 50 VDC.

    Overspeed Range: 0 to 9000 RPM.

    Pulses per Revolution: 4 to 255.

    Tachometer Range: 0 to 65,535 RPM.

    Tachometer Accuracy: ±1% of the display reading or -2 RPM whichever is greater.

    Input Frequency Range: 25 Hz to 20 kHz.

    Hourmeter Range: 0 to 99999 hrs.

    Hourmeter Resolution: ±0.1 Hour up to 9999.9; ±1 hour 10,000 and up.

    Reset Hourmeter: Apply temporary ground to terminal #5 to reset hours to zero.

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Murphy by Enovation Service Network

Palmer Johnson's six-location factory-authorized service center network features:

  • Factory-trained technicians
  • Field service
  • Onsite troubleshooting and diagnostics
  • Unit removal and installation

For Murphy by Enovation service, call 1-800-341-4334.

Learn more

Madison, WI

Service Center

Service: (608) 834-5206

1835 Haynes Dr
Sun Prairie, WI 53590


Dallas, TX

Service Center

Service: (817) 505-2430

608 112th St
Arlington, TX 76011


Denver, CO

Service Dealer

Service: (720) 724-0033

5151 E 56th Ave
Commerce City, CO 80022


Kansas City, KS

Service Center

Service: (913) 202-6944

15360 South Mahaffie St
Olathe, KS 66062


Los Angeles, CA

Service Center

Service: (562) 356-1590

12020 Bloomfield Ave
Santa Fe Springs, CA 90670


Oklahoma City, OK


Sales: (800) 341-4334

Oklahoma City, OK 73128


Phoenix, AZ

Service Dealer

Service: (602) 253-0214

2401 S. 19th Street
Phoenix, AZ 85034


San Francisco, CA

Service Dealer

Service: (510) 342-2212

1930 W Winton Ave #14
Hayward, CA 94545


St. Louis, MO

Service Center

Service: (636) 203-9811

578 Rudder Rd
Fenton, MO 63026


Philadelphia, PA

Service Dealer

Service: (215) 822-8300

159 Discovery Dr
Colmar, PA 18915


Fort Myers, FL

Service Dealer

Service: (239) 693-7477

4821 Waycross Road
Fort Myers, FL


Vancouver, British Columbia

Service Center

Service: (604) 879-6731

6741 Cariboo Rd Unit 205
Burnaby, British Columbia V3N 4A3


Edmonton, Alberta

Service Center

Service: (780) 434-9578

3804 53rd Ave NW
Edmonton, Alberta T6B 3N7


Seattle, WA

Service Center

Service: (425) 251-3434

1710 136th Ave E
Sumner, WA 98390


RECON Equipment Center, WI

Service Center

Service: (608) 834-5220

1828 Haynes Dr
Sun Prairie, WI 53590

Map of Palmer Johnson Power Systems locations