SCM4 – CARBON MONOXIDE SENSOR

A carbon monoxide detector for HVAC technicians. The SCM4 measures CO levels from 0-1000 ppm using a fast electrochemical sensor. Dual display shows current reading and peak hold simultaneously. Audible alarms alert you to dangerous levels. Essential for furnace combustion safety testing and flue gas analysis.

Specs: 0-1000 ppm CO detection, electrochemical sensor, dual display, audible alarms, by Fieldpiece

Replaces: SCM4

Fits: Furnace combustion testing, flue gas analysis, indoor air quality testing, and general CO safety

In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.

Specs

• TypeTest instrument

What meter do I actually need for HVAC?

A true-RMS multimeter that reads AC and DC volts, resistance, microamps and capacitance covers most of the work. Microamps matters for flame sensors, and capacitance means you can test a run capacitor instead of guessing at it.

Why true RMS?

An averaging meter reads wrong on the distorted waveforms that ECM motors and variable-speed equipment produce. True RMS reads them correctly. On modern equipment it is not optional.

Can I test a capacitor with a regular meter?

Only if it has a capacitance range, and only after the capacitor is fully discharged. If yours does not, bring the capacitor to us - we bench-test them free at the counter.

What is a clamp meter for?

Reading current without breaking the circuit. You clamp around one conductor to check what a compressor or blower is actually drawing against its nameplate rating. It is the fastest way to tell a struggling motor from a healthy one.

What CAT rating do I need?

CAT III is the sensible minimum for HVAC. It is the meter's ability to survive a voltage transient without becoming a hazard in your hand. Cheap unrated meters are the ones that fail dangerously.

Do you stock meters and probes?

On the shelf at 10226 Plano Rd, Suite 104 in Dallas.