Concept Direct (UK) Ltd 2008
To check levels of carbon monoxide use the ACM3. An AMN2 manometer can be used to
ensure you have proper gas line and manifold pressure. An AUA2 can ensure that the
flame diode circuit is functioning properly and not causing the furnace to “lock
out”. The AOX2 accessory head measures %O2 of flue gas. It also displays %CO2. The
ADMN2 is a dual port manometer, which allows the user to measure pressure drop. Use
the ADMN2 to make sure the conditioned space has a positive pressure, keeping combustion
products out. To look at our standalone products go to the Standalone page on this
website.


The ACM3 measures CO in the air and finds CO sources.
- Fast enough to locate CO source in “walk around” test.
- Response Time: <70sec to 90% of reading.
- Three pin sensor for better performance.
- Optional pump (AOXP2).
- Auto off can be disabled for data logging.
- Select real time or average.
- Range: 0 to 1000PPM (2000PPM with 5 minute max exposure time).
- Accuracy: 0-33ppm + 5% reading + ppm after zeroing.
- Sensor Type: Electrochemical (specific to CO).
Measures gas pressure and has a resolution low enough for static pressure.
- Maximum + 20 inches WC (water column) for gas pressure.
- Accuracy: + 2% FS.
- 0.01 inches WC resolution for static pressure.
- Includes tube and adaptor for gas pressure measurement.
- Manual zero set for comparing two pressures.
- Auto off can be disabled for data logging
The AOX2 measures the oxygen in the air for combustion analysis. The AOX2 also computes
%CO2 and measures stack temperature.
- Displays %O2, %CO2 or temperature.
- Includes field calibrate K-Type thermocouple and hand pump with an inline water trap
and filter (AOXP2).
- STABLE LED indicates when the reading is stable.
- %O2: Range: 0 25% O2, Accuracy: +0.3%, Resolution: 0.1
- Temp: Range: -58ºF to 1000ºF. Accuracy: + 0.6% + 3ºF after simple field calibration.
Resolution: 0.1ºF
The ADMN2 is a dual port manometer accessory head that measures differential, absolute
and static pressure in mBar or inches of WC (Water column).
- Range from -60 to +60.0 inches WC.
- Accuracy of + 1.5% FS
- Resolution down to 0.01 in WC for static pressure measurements.
To download the combustion efficiency worksheet
Measures microamps for flame diode test. Measures 4 to 20mA control circuits.
- Includes flame diode adaptor kit (AQK3).
- Max current: 200mA AC or DC.
- Resolution: 0.1 for meters with 0.1mVDC.
- Accuracy: DC: + (1.0%rdg + 1dgt) AC: + (1.5% + 2dgts)