Dynalco MTH-103E Tachometer / Hourmeter / Overspeed Trip - Manual (Page 3)

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System Overview
This manual contains a general product description of the MTH-103E Microprocessor-Based
Tachometer/Hourmeter/Trip. It also supplies information about the MTH-103E features,
functional design, specifications, and configuration.
Basic operation
The MTH-103E is a microprocessor-based 5-digit tachometer, hourmeter, and trip. The trip
can be programmed to activate on overspeed, underspeed (Class C), or hours. The unit may
be magnetic pickup or DC powered. The MTH-103E is CSA approved for Class I, Division 2,
Groups A, B, C & D hazardous locations. When pickup powered the MTH103E is rated Class
I, Division 1, Groups A, B, C & D.
Features
The MTH-103E tachometer provides the following features:
• Both signal and power can be derived from a magnetic pickup.
• High accuracy: 5-digit display; 1 RPM resolution; 100,000 hour range.
• Universal: Can be field configured from front keypad for any number of pulses per
revolution, trip point value, and preset/reset hours.
• Displays speed, hours, and the setpoint on command. Fast overspeed reaction time of
100 milli-seconds.
• Design incorporates hardware and materials creating a weatherproof unit that allows
installation in poorly protected areas. This is ideal for both indoor and outdoor
installations.
• Standard Society of Automotive Engineers (SAE) case fits engine panels with 3-3/8
inch (86 millimeter) openings.
• Unit is highly shock and vibration resistant. Face plate is gasketed and spray proof.
• Unit is highly resistant to electrical noise.
Specifications
Input Signal Passive (variable reluctance) 2-wire magnetic pickup
Digital Output TRIAC rated @ 0.15 A / 40 VDC
Input Power 9 – 30 VDC or pickup power
Display Backlit Graphic Display
Connections Screw Terminals
Operating Temperature
Range - 40 to + 70 Deg C
Certification CSA Class I, Division 1 & 2, Groups A, B, C, D
User Interface
The MTH-103E is configured via the keypad on the front panel which includes a graphical
backlit LCD display capable of displaying alpha numeric values. The keypad implements a
menu system, which is navigated using the up, down, left, right, enter and escape buttons.
The display backlight is enabled only when DC powered.