Fieldpiece SCM4 User Manual
Fieldpiece
MAX
ON/OFFMUTE
MAX
Carbon
Monoxide
Detector
Measures
CO in PPM.
PRESS FOR
1 SECOND
MAX
ON/OFF
MAX
!
!
Carbon Monoxide
Detector
OPERATOR'S
MANUAL
Model
SCM4
MAX
ON/OFFMUTE
PRESS FOR
AUTO-OFF
1 SECOND
BATT CHECK
Carbon
Monoxide
Detector
Measures
CO in PPM.
ZERO
SCM4
Quick Start
1. Install 9V battery located in the battery compartment.
2. Press ON/OFF for 1 second to power
on the SCM4 in a nominal CO environment such as outdoors.
Note: 10 second warm up ensues.
3. If necessary, press ZERO while outdoors to set the ambient CO ppm.
4. Carbon monoxide (CO) above nominal levels will be displayed in parts
per million (ppm.)
5. Press ON/OFF for 1 second to power
o.
Certifications
C-Tick (N22675)
CE
WEEE
RoHS Compliant
Description
The SCM4 standalone carbon
monoxide detector 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 SCM4 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 SCM4 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 SCM4 to reach
ambient temperature and %RH.
4. The sensor has built-in permanent
non-replaceable lter to lter out
trace concentrations of SO2, NO2,
and most hydrocarbons. If exposed
to high concentrations of harmful
chemicals such as methanol, ethanol, or dirt, the lter can deteriorate
and/or impede diusion of CO to
the sensor.
WARNING
Extended exposure to even relatively low carbon monoxide concentrations can be hazardous to human health.
Evacuate areas of signicant CO concentration immediately. See the CO Exposure Eects 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 sulfuric acid or phosphoric acid because of the corrosive
nature of these electrolytes.
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Display
How to Use
"Walk Around" Test
Auto Power O
(APO) Enabled
Real Time CO ppm
Measurement
Maximum CO ppm
Measurement
Controls
ON/OFF
ZERO
Hold for one second to toggle power.
Cancel out any ambient
nominal CO. (See Zero Set.)
Toggle backlight on display.
MUTE
MAX
Instrument Muted
Low Battery
Mute the beep. Hold for one second to
check % battery remaining.
(Hold while powering ON to disable APO.)
Show maximum measurement.
The SCM4 responds almost instantly
to changes in CO levels in the air. If
you see a dierence in CO levels from
outside to inside, you need to nd 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 eects and
can be fatal.
Zero Set
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 specications and probe
is in equilibrium (temperature and
relative humidity) with ambient.
To zero, hold the ZERO button
for one second or until “ZERO” is
displayed. (Note: For safety reasons
the SCM4 will not zero if reading is
above 5ppm.)
Specifications
Sensor Type: Electrochemical (specic 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.
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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: Eects can vary signicantly 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
species a max exposure of 100 min.
In two to three hours: slight
headache, tiredness, dizziness,
nausea. UL2034 species a max
exposure of 35 min.
In one or two hours: frontal
headaches. In three hours: life
threatening. UL2034 species 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 the meter displays the
battery should be replaced. Turn your
SCM4 o and replace the 9V battery.
Check Your Sensor:
Coee Cup CO Test
To demonstrate that your CO sensor
works, turn a ceramic coee 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
ame starts to icker, 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
flame in and out of the mouth of the
coee cup to just keep the ame alive. The
longer you keep the ame ickering, the
more CO you produce. After 10 seconds
of ickering, 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
The SCM4 uses a carbon monoxide
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 from the top.
5. If the sensor is incorrectly installed, "CO
Err" will be displayed and the meter
will automatically shut down after 5
seconds.
Incorrect
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.
13 15 1814 1716
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 verification 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
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.
More Instruments
from Fieldpiece
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
www.eldpiece.com
economic loss.
State laws vary. The above limitations
or exclusions may not apply to you.
©Fieldpiece Instruments, Inc 2013; v08
Digital Refrigerant Manifolds
APO MAXMIN HOLD SET
°F %
°C
Natural
Oil#2PropaneCustom
Gas
AUTO-OFF
MEASURE/HOLD
ENTER
°F
°C
Combustion
Check
Excess Air,
and %O
%CO
2
TEMP CAL
SOX3
ON/OFF
PRESS FOR
1 SECOND
SET CUSTOM
FUEL
MAX/MIN
2
EXHAUST
%
CO
2
MAX
EA
CLEAR
In-Duct
Psychrometer
& Air Velocity
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DEW POINT
ENGLISH METRIC
RH%
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°F
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ENGLISH
AVG
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NORMAL
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M/s
°C
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AAT3
80
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P1-P2
ADMN2
(LCD/10)
P2
P1
ON
Lo Batt
0.1
ENGLISH
0.01
METRIC
MIN
AUTO
ZERO
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MICRONS OF MERCURY
VACUUM
GAUGE
ALARM
ENTER
SVG3
Accessory Heads
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