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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.
During normal operation, the MTH6 displays RPM. Its five-digit, liquid crystal display is updated every second. When the MTH6 is displaying hours and a speed signal is present, the far left digit and decimal point will flash indicating the hourmeter is operating.
The overspeed set point and running hours can be viewed by manipulating three membrane switches located on the MTH6 front panel. When the overspeed set point is met, an LED located on the front panel lights.
Power Requirements: 8-40 VDC (12, 24 or 32 VDC systems).
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.
Shipping Weight: 14 oz. (435 g).
Shipping Dimensions: 5-1/2 x 5-1/2 x 5-1/2 in. (140 x 140 x 140 mm).
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