Fieldpiece ACM4 User Manual

Fieldpiece

!

!

Carbon Monoxide
Accessory Head

OPERATOR'S
MANUAL

Model
ACM4

ACM4

Quick Start

1. Install 9V battery (included).

2. Connect ACM4 to Fieldpiece Meter.

3. Select the mVDC range on DMM.

4. Slide the power switch to ON and
allow the warmup to complete.

Note: Green and red LEDs will light

solidly for 10 seconds.

5. If necessary, ZERO the ACM4 to
atmosphere with no carbon mon­oxide (CO).

6. Carbon monoxide (CO) above nomi­nal levels will be displayed in parts
per million (ppm).

7. Power ACM4 o by sliding the power
switch to the OFF position.

Certifications

C-Tick (N22675)

CE

WEEE

RoHS Compliant

Description

The ACM4 carbon monoxide
accessory head measures carbon
monoxide in parts per million (ppm).

It is intended to measure levels
of CO in still, ambient air. The most
practical application of the ACM4 is
to determine if the indoor CO levels
are higher than outdoor levels and to
determine the source. In many cases,
it can help locate a source of CO.

The ACM4 uses a fast reacting,
electrochemical sensor that does not
consume chemicals and can easily be
replaced in the eld if needed. Sensor
Life is primarily determined by the
type of exposure.

Precautions

1. Do not measure gas engine
exhaust or other high CO or highly
contaminated gases. High levels of
CO and other contaminants can ruin
the sensor and be a health hazard.

2. Do not take readings directly in
stream of air at register or in a ue.

3. Allow enough time for ACM4 to
reach ambient temperature and
%RH.

4. The sensor has built-in permanent
non-replaceable filter to filter
out trace concentrations of SO2,
NO2, and most hydrocarbons. If
exposed to high concentrations of
harmful chemicals such as methanol,
ethanol, or dirt, the filter can
deteriorate and/or impede diusion
of CO to the sensor.

WARNING

Extended exposure to even relatively low carbon monoxide concentrations can be hazardous to human health.

Evacuate areas of signicant CO concentration immediately. See the CO Exposure Eects section of this manual.

CAUTION

Do not take measurements directly at a tailpipe, or at a ue. See "Precautions."
Do not rely solely on a carbon monoxide measurement to determine if a heat exchanger is bad. See “CO

Detectors and Cracked Heat Exchangers" section.

The majority of toxic gas sensors contain sulphuric acid electrolyte and the chemical hazard is mainly related
to the corrosive nature of this compound. These sensors also contain platinum, ruthenium, gold, silver, carbon
some of which are toxic.

Any skin or eye contact with the contents of these sensors should be washed immediately with copious amount
of water. Obtain medical advice.

Electrochemical gas sensors are sealed units containing an aqueous electrolyte and a combination of other
substances as detailed above. Provided these sensors are used only for their intended application they do not
represent a chemical hazard.

The sensors must not be exposed to temperatures outside the range -50°C to 60°C. Toxic gas sensors should
not be exposed to organic vapours which may cause physical damage to the body of the sensor, for example 1,
2 dichloroethane.

Should any sensor be so severely damaged that leakage of the contents occurs then the following procedures
should be adopted.
a. Avoid skin contact with any liquid or internal component through use of protective gloves.
b. Disconnect sensor if it is attached to any equipment.
c. Use copious amounts of clean water to wash away any spilt liquid. This is particularly important in

equipment where the sensor involved contains sulphuric acid or phosphoric acid because of the corrosive

nature of these electrolytes.

01 03 0602 0504

How to Use

1. Connect COM and Volts jacks using
Fieldpiece deluxe test leads. For
Fieldpiece "stick" meter, slide the
head directly over the meter.

2. Select the mVDC range.

3. Power ACM4 on by sliding the power
switch to the ON position and allow
warmup to complete.

4. Take the instrument outside and
adjust it to zero. Then bring inside
to take measurements.

5. Expose sensor to a still, stable air
sample (see precautions). The dis­play reacts to the presence of CO
in seconds. Take nal reading when
reading stabilizes.

6. For initial tests, walk around the
building, watch for the readings
to go up to determine where
maximum concentrations of CO
are present. To measure air from
register, use a pump or measure
out of the air stream. Hot blowing
air can adversely aect the reading.
The temperature of the sample must
be near ambient.

07 09 1208 1110

Zero Adjust

As needed, set the reading to zero in
a known zero CO atmosphere and in a
temperature similar to the sample air
to be tested. Zero only when ambient
air is within specications and probe
is in equilibrium (temperature and
relative humidity) with ambient.

To zero, removing the protective
rubber cover to access the calibration
screw. Using the calibration Tool
provided, turn the calibration screw
until the display reads ZERO. (Note:
For safety reasons the ACM4 will not
zero if reading is above 5ppm.)

"Walk Around" Test

The ACM4 responds almost
instantly to changes in CO levels in
the air. If you see a difference in CO
levels from outside to inside, you
need to find the source of the CO.
Walk around and watch the display.

By constantly going towards the
area of higher concentration, you can

determine the source of the CO.

Persistent sources of CO, such
as malfunctioning combustion
equipment in occupied spaces, must
be serviced immediately. These can
be life threatening.

When searching for sources of CO,
make sure that you never put yourself
or anyone else in danger of excessive
exposure to CO. Overexposure to CO
can have long-term health eects and
can be fatal.

Average Switch

The average switch averages the
reading over the last two or three
seconds. This allows the user to read
more stable measurements.

Specifications

Sensor Type: Electrochemical (specic to CO)
Sensor Calibration: Factory calibrated @ 205 ppm CO
Range: 0 to 1000 ppm;

0 to 2000 ppm (less than 5 minute exposure time)

Initial Accuracy: @ 73°F±9°F, <75% R.H.

0-15ppm ±5% reading ±1 ppm after zeroing
16-35ppm ±5% reading ±2 ppm after zeroing
36-1000ppm ±5% reading ±5ppm after zeroing

Long Term Drift: less than 5% per year

(depending on use)

CO Air Sample Temperature Range: 32 to 105°F
Operating Environment: 32 to 122°F (0 to 50°C);

15 to 90% R.H., non-condensing

Storage Environment: 32 to 68°F (0 to 20°C) at

<80% R.H. with battery removed from meter.

Battery: 9V.
Battery Life: 150 hours typical alkaline.
Auto Power O: After 15 minutes.

Storage

To maintain sensor integrity, do
not store in areas containing solvent
vapors. This includes aerosols such
as air-freshener, wax polish, window
cleaner, and all organic solvents.

CO Detectors and
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 ame must generate high con-

centrations of CO (lack of oxygen,

excess fuel, high temp).

2. Enough exhaust gases must be emit-

ted 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.

CO Exposure Effects

9 ppm

35 ppm

50 ppm Max for eight hours (OSHA).

100 ppm

200ppm

400 ppm

800 ppm

800 ppm In two to three hours: death.

1600 ppm In one hour: death.

6400 ppm In fteen minutes: death.

12800 ppm In three minutes: death.

Note: Eects can vary signicantly depending on
age, sex, weight, and overall health.

Minimal. Max allowable concentration
for eight hours (EPA and ASHRAE).

Max for continuous exposure for one
hour (EPA and ASHRAE).

Trips installed CO detectors. UL2034
species a max exposure of 100 min.

In two to three hours: slight
headache, tiredness, dizziness,
nausea. UL2034 species a max
exposure of 35 min.

In one or two hours: frontal
headaches. In three hours: life
threatening. UL2034 species a max
exposure of 15 minutes.

In forty ve minutes: dizziness,
nausea, and convulsions.

Maintenance

Clean the exterior with a dry cloth.

Do not use liquid.

Battery Replacement

When "LO BATT" LED is flashing,
the battery should be replaced. Turn
your ACM4 off and replace the 9V
battery.

Check Your Sensor:
Coee Cup CO Test

and out of the mouth of the coffee
cup to just keep the ame alive. The
longer you keep the ame ickering,
the more CO you produce.

After 10 seconds of flickering,
extinguish the ame and put the CO
head in the mouth of the cup. You
should see readings in the 100s. Take
it out if it approaches 1000PPM.

CO Sensor Replacement

5. If the sensor is incorrectly installed,
"ON" LED and "LOW BATT" LED will
blink alternately and after 5sec, the
ACM4 will auto power o.

The ACM4 uses a carbon monoxide

To demonstrate that your CO
sensor works, turn a ceramic coffee
cup upside down and slide it over
the edge of a counter (or desk) to
expose about a third of the mouth of
the cup. Burn a cigarette lighter inside
the exposed mouth of the cup. Don't
burn the counter.

When the flame starts to flicker,
you've burned up most of the oxygen
in the cup creating carbon dioxide
and now you're starting to produce
carbon monoxide. Bring the ame in

smart sensor. If you are seeing erratic
CO readings or no readings in a
known CO environment, you likely
need to replace the sensor.

1. Obtain replacement sensor model
RCM4 from your local distributor.

2. Remove sensor cap by removing the
4 screws.

3. Directly pull out old sensor.

4. Hold the new sensor by the sides.
While holding the sensor on the
sides; press down to secure the new
sensor. Do not press the new sensor

Carbon

Monoxide

Accessory

Head

from the top.

13 15 1814 1716

Carbon
Monoxide

Accessory
Head

ON

LOW BATT

ON

AVERAGE

Incor rect

Carbon

Monoxide
Accessory
Head

ON

LOW BATT

ON

AVERAGE

Sensor Disposal

The RCM4 Replacement carbon
monoxide smart sensor contains
sulfuric as well as precious metals. The
sensor should be recycled properly
through a local electronic waste
center.

Limited Warranty

This meter is warranted against
defects in material or workmanship
for one year from date of purchase.
Fieldpiece will replace or repair the
defective unit, at its option, subject
to verication of the defect.

This warranty does not apply to
defects resulting from abuse, neglect,
accident, unauthorized repair,
alteration, or unreasonable use of the
instrument.

Any implied warranties arising
from the sale of a Fieldpiece product,
including but not limited to implied
warranties of merchantability and
fitness for a particular purpose, are
limited to the above. Fieldpiece shall
not be liable for loss of use of the
instrument or other incidental or
consequential damages, expenses, or
economic loss, or for any claim of such
damage, expenses, or economic loss.

State laws vary. The above
limitations or exclusions may not
apply to you.

For Service

In the USA, call Fieldpiece
Instruments for one-price-x-all out
of warranty service pricing. Send
check or money order for the amount
quoted. Send the meter freight
prepaid to Fieldpiece Instruments.
Send proof of date and location of
purchase for in-warranty service. The
meter will be repaired or replaced,
at the option of Fieldpiece, and
returned via least cost transportation.
Outside of the USA, please visit www.
fieldpiece.com for service contact
information.

www.eldpiece.com

©Fieldpiece Instruments, Inc 2013; v08

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