Castair Gas Engine Hour Meter — HRM50
The HRM50 is the hour meter for gas-engine-powered Castair compressors, priced at 85.47. Where the HRM75 and HRM460 connect to AC motor circuits and measure hours based on AC power flow, the HRM50 connects to a gasoline engine's ignition system. It reads the ignition pulses to count engine-running hours — no AC power required, just the ignition signal from the engine's coil or distributor. If you have a Castair gas-powered portable compressor and you want to track engine hours for oil changes, tune-up intervals, and spark plug replacement, the HRM50 is the correct meter.
HRM50 Features
- Ignition-Based Signal: Connects to the engine's ignition system — counts hours based on ignition pulses rather than AC power, making it compatible with gasoline-engine compressors regardless of engine make or model
- No External Power Required: Draws its operating power from the ignition signal itself — no separate power connection needed
- Non-Resettable Counter: Accumulates engine operating hours permanently — accurate lifetime tracking for tune-up intervals and resale documentation
- Castair Factory Specified: Listed in Castair's accessories catalog as the gas engine hour meter for their gas-powered compressor line
- Compact Panel-Mount Design: Fits in standard panel cutouts on gas compressor control boxes and enclosures
Why Track Engine Hours on a Gas Compressor?
Gas engines need more frequent maintenance than electric motors. Engine oil needs changing at 50-100 hour intervals (versus 400-800 hours for compressor pump oil). Spark plugs need inspection and replacement. Air filters get dirtier faster. The carburetor needs periodic cleaning. Without an hour meter, you are either guessing or going by calendar — and on a seasonal or intermittent-use gas compressor, calendar time is a terrible proxy for actual engine wear. The HRM50 gives you an accurate engine hour count to drive all of these intervals correctly.
Gas vs. Electric Hour Meters — Key Differences
- HRM50 (Gas) — THIS PRODUCT: Ignition-based signal. For gasoline-engine compressors. Requires connection to ignition coil or distributor. No AC power needed.
- HRM75 (Electric, 24-277V): AC-powered counter. For single-phase electric compressors. Connects to motor circuit.
- HRM460 (Electric, 460V): AC-powered counter. For three-phase 460V electric compressors.
Factory-Mounted Option
The HRM50M is the factory-mounted version — ordered when buying a new Castair gas-powered compressor and installed at the factory. The standalone HRM50 is for retrofitting existing units.
What's in the Box
- 1 x Gas engine hour meter (HRM50)
Technical Specifications
- Part Number: HRM50
- Signal Type: Ignition-based (connects to engine ignition system)
- Application: Gasoline-engine-powered air compressors
- Counter: Non-resettable hour accumulator
- Mount: Panel mount
Why Buy From Air Compressor Factory Direct?
We have specialized in Castair compressors and accessories since 2016. Gas-engine compressors require more frequent maintenance than electric units, and an accurate hour meter is essential for keeping up with those intervals. The HRM50 is the factory-specified gas engine meter — call us at 866-217-0063 if you need installation guidance or want to confirm compatibility with your specific gas compressor model. Free shipping, full warranty.
Call 866-217-0063 for quick answers and help!
