Product Description

Part number 100690 is an electronic solid-state hour meter used to record operating time on engines, motors, and equipment. It is intended for installation in equipment panels to provide an accurate indication of accumulated run hours when DC power is applied.

0 1. Overview

This hour meter is identified with model 873 and part number 100690 and is designed for operation on DC power sources from 12 to 24 volts. The unit mounts in a standard 2-1/4 inch instrument panel cutout and is furnished with mounting hardware for secure installation. It functions as a solid-state device that starts and stops the count instantly with application or removal of electrical power. The running indicator advances in steps, indexing every six seconds to update the displayed time.

The meter is specified with a body length of 2.06 inches and a total depth behind the panel of 1.43 inches for clearance planning. It draws 500 mA for a 47 millisecond pulse every six seconds at 14 VDC, and use with a 2 amp inline fuse is recommended for circuit protection. If the unit is wired with incorrect polarity or connections, it does not operate but it is not damaged. The meter is described for experimental aircraft use or as a direct replacement where accepted, and it does not carry PMA or TSO approvals. The indicated weight is approximately 0.183 pounds, supporting use in instrument panels where weight is a consideration.

0 2. Key Features

  • Electronic solid-state hour meter under part number 100690
  • Operates on DC power from 12 to 24 volts
  • Mounts in a standard 2-1/4 inch instrument panel hole
  • Running indicator indexes every six seconds
  • Supplied with mounting hardware for installation
  • Designed so incorrect wiring prevents operation without damaging the unit
  • Intended for experimental aircraft use or direct replacement applications
0 3. Specifications

Part number: 100690
Model designation: 873-100690-D
Device type: Electronic solid-state hour meter
Operating voltage range: 12 to 24 VDC
Mounting hole size: 2-1/4 in instrument panel opening
Body length: 2.06 in
Total depth behind panel: 1.43 in
Current draw: 500 mA for a 47 ms pulse every 6 s at 14 VDC
Recommended fuse: 2 A inline fuse
Weight: 0.183 lb
Approvals: Non-TSO, not PMA; described for experimental use or direct replacement

FAQs

01. What voltage range does hour meter 100690 operate on?

Hour meter 100690 operates on DC voltages from 12 to 24 volts.

02. What panel cutout size is required for installing hour meter 100690?

Hour meter 100690 mounts in a standard 2-1/4 inch instrument panel hole.

03. How often does the running indicator on hour meter 100690 advance?

The running indicator on hour meter 100690 indexes every six seconds.

04. What fuse size is recommended for use with hour meter 100690?

A 2 amp inline fuse is recommended for use with hour meter 100690.

05. Is hour meter 100690 approved under PMA or TSO?

Hour meter 100690 is not PMA or TSO approved and is described for experimental use or direct replacement applications.

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