Dynalco MTH-103D Tachometer / Hourmeter / Overspeed Trip - Manual (Page 2)

2 MTH-103D Installation and Operation Manual
Overview
This manual contains a general product description of the MTH-103D ™
Microprocessor-Based Tachometer/Hourmeter/Trip. It also supplies information
about the MTH-103D features, functional design, specifications, and configura-
tion.
1.0 Product Description
The MTH-103D 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 pickup or dc powered. The MTH-103D is approved by
the Canadian Standards Association (CSA). For further CSA requirements, refer
to drawings 80010401 on pages 11 and 12 of this manual.
1.1 Features
The MTH-103D 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 calibrated with the single push button 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 0.1 second (above 20 Hz input) is
independent of sensing gear teeth.
• Design incorporates hardware and materials creating a weatherproof
unit that allows installation in poorly protected areas. Display contrast
increases with increasing ambient light. This is ideal for both indoor and
outdoor installations.
• Standard Society of Automotive Engineers (SAE) case fits engine panels
with 3.5 inch (88.9 millimeter) openings.
• Unit is highly shock and vibration resistant. Face plate is gasketed and
spray proof.
• Unit is highly resistant to electrical noise.
1.2 Installation
The MTH-103D is designed for panel mounting either on or off the engine. If on
engine mounting is required, shock mounts are recommended. A 3.5 inch (88.9
millimeter) cut out in the panel is required for installation. A mounting clamp is
included with the meter.