User's Manual

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Features and Benefits

Competitive Advantages

What's Included?

Recommended

Specifications

What is It?

Carbon Monoxide Detector - Measures Carbon Monoxide in Parts Per Million (0 - 1000 ppm CO)
The ACM3 is a carbon monoxide detector (CO detector) accessory head for use with our modular instruments. It has a very fast reaction time thanks to an electrochemical sensor is specific to carbon monoxide (CO). This rugged instrument can help you hunt down sources of potentially life-threatening, poisonous gas.

Carbon monoxide (CO), a product of combustion, is an odorless, colorless gas. Faulty combustion equipment is one source of this dangerous gas known as the “silent killer”.

The ACM3 carbon monoxide detector measures CO in parts per million (ppm). Use it for walk-around tests to help pinpoint sources of CO indoors. Measure CO ppm in flue gas using the optional AOXP2 (see combustion_check.html) pump.

How Does it Work?

• Zero the unit outdoors away from any source of CO.
• Enter the structure.
• Walk around and watch the display.
• Move toward the area of highest concentration to find the CO source.

The chart below outlines exposure guidelines as determined by various industry organizations

Testing for Cracked Heat Exchangers

A CO detector cannot tell you if a heat exchanger is good. A CO detector can indicate that a heat exchanger may be cracked only if all of the following conditions occur simultaneously:

1. The flame must generate high concentrations of CO (lack of oxygen, excess fuel, high temp).
2. Enough exhaust gases must be emitted from the heat exchanger crack.
3. The exhaust gases from the crack must not be diluted too much before coming in contact with the sensor. A cracked heat exchanger may leak CO in a small stream. You may measure high concentrations at one point but low concentrations only an inch away.
4. The heat exchanger must be the only possible source for the CO detected.

The "Flue Test" and Remote Testing - Requires Optional AOXP2 flue gas pump
Too much carbon monoxide (CO) in flue gas is one indication to field technicians that combustion is incomplete.

Use the model AOXP2 pump to extract samples from hard to reach places or from locations where the temperature is high (such as a flue). For potentially high concentrations of CO, pump slowly and stop if the measurement approaches 2000PPM.

Carbon monoxide concentrations will begin to show in two or three squeezes. For final reading, pump until the reading stabilizes, about 30 squeezes. Press MAX on SCM3 to hold the highest reading.

NOTE: To make an accurate assessment that combustion is within manufacturer's specifications, in addition to CO ppm, you also need to measure flue gas %O2 (%Oxygen), Temp, %CO2 (%Carbon Dioxide) and sometimes %EA (% Excess Air). The SOX2 Combustion Check Meter or AOX2 Combustion Check Accessory Head (hyperlink to article title) gives you the other measurements you need to tune combustion equipment.

Features and Benefits

The ACM3 Carbon Monoxide Detector (CO Detector) offers several features and benefits to field technicians:

• Works with any Fieldpiece expandable instrument or handle or any DMM with mVDC ranges and our detachable leads.
• Fast electrochemical sensor helps you find CO sources like cracked heat exchangers or breached flue stacks.
• Calibrate to ambient quickly with ZERO calibration pot.
• Auto Power Off (APO) to save battery life (easy to disable).
• Battery check with % of battery life left displayed.
• Use with optional AOXP2 pump for flue gas testing.

Competitive Advantages

Our proven carbon monoxide specific, electrochemical sensor continues to be a favorite of field technicians. It’s also found in our newer standalone CO Detector (model SCM3). We haven't found a sensor on the market that outperforms our sensor.

Besides the advantages outlined in Features and Benefits in the section above, like all Fieldpiece standalone instruments, the ACM3 offers additional advantages to field service technicians.

• Intuitive interface. A fancy way of saying easy to use. Technicians take it out of the box and know how to use it before even opening the manual. (Of course, please read the two page operator's manual before use.)
• Rugged sensor maintains accuracy over time. (see Specifications below)
• Optional AOXP2 hand pump works much better in cold weather than most electronic pumps.

Recommended Accessories and Replacement Parts

Technicians who like the ACM3 may also enjoy these instruments and accessories:

	Expandable True RMS Stick Multimeter with Backlight - HS36 Our top of the line True RMS Stick Meter, the HS36 includes the ranges you use everyday for HVAC/R field service plus includes a bright blue backlight and True RMS. Like the rest of the HS30 series, the HS36 comes equipped with a magnetic hanger, along with detachable silicone test leads and alligator clip probe tips for remote and easy one-handed testing, as well as the full set of built-in safety features.  This auto-ranging stick meter also includes a bar graph on the LCD for an analog feel. Technicians who prefer our expandable stick meters tell us this is the best digital multimeter for HVAC/R field Service. Read More..
	HVAC Guide® System Analyzer - HG1 The HVAC Guide® System Analyzer from Fieldpiece guides technicians, step-by-step through critical HVAC system tests including Target Evaporator Exit Temperature, Superheat, Subcooling and Combustion Analysis. Like all Fieldpiece Instruments, the HVAC Guide tm Tester is designed to make the HVACR field technician's job easier, faster, safer and more effective. Upload customer records to your PC and back to the HVAC Guide tm Tester when you go to visit them for a check-up. Make sure you've covered the important tests on every call. The HVAC Guide tm Tester: Do it right every time. Read More..
	Flue Aspirator Pump - AOXP2 Fieldpiece currently offers a hand aspirator flue pump, model AOXP2, designed for combustion testing using our accessory head and standalone combustion instruments with top mounted sensors. The pump comes standard with the AOX2 and SOX2 Combustion Check instruments. It is available for purchase from your favorite distributor for use with the ACM3 and SCM3 Carbon Monoxide (CO) test instruments. Use with your favorite Fieldpiece combustion testing equipment to enter data on the HVAC Guide® System Analyzer for combustion analysis. Read More..
	Deluxe Meter Case – ANC1 The Deluxe Meter Case, model ANC1, easily holds 1 meter and 2 accessory head instruments. Features include rugged nylon construction, padding, durable pockets inside and out, a rugged double zipper and a shoulder strap. The ANC1 comes standard with our HS30 Series Stick Multimeters. Read More..

Specifications

TECHNICAL SPECIFICATIONS
Range: 0 to 1000PPM (2000PPM with 5 minute max exposure time)
Initial accuracy at 73ºF±9ºF, <75%RH:
0-15ppm ±5% reading ±1 ppm after zeroing
16-35ppm ±5% reading ±2 ppm after zeroing
36-1000ppm ±5% reading ±5ppm after zeroing
Display: Updates real-time
CO air sample temperature range: 32 to 105°F
Operating environment: 32 to 122ºF (0 to 50°C)
Operating relative humidity: 15 to 90%RH, non-condensing
Storage temperature: -4ºF to 140ºF, 0 to 80% R.H. with battery removed from meter.
Sensor type: Electrochemical (specific to CO)
Sensor calibration: Factory calibrated on 205ppm
Long term drift: <5% / year (depending on use)
Battery: 9V
Battery life: Approx.150 hrs typical (Alkaline)
Auto power off (APO): 15 minutes