Fieldpiece SCM4 - Carbon Monoxide Detector User Manual download pdf

01 03 0602 0504

07 09 1208 1110

Quick Start

1. Install 9V battery located in the bat-

tery compartment.

2. Press ON/OFF for 1 second to power

on the SCM4 in a nominal CO envi-

ronment such as outdoors.

Note: 10 second warm up ensues.

3. If necessary, press ZERO while out-

doors to set the ambient CO ppm.

4. Carbon monoxide (CO) above nomi-

nal levels will be displayed in parts

per million (ppm.)

5. Press ON/OFF for 1 second to power

o.

Certiﬁcations

C-Tick (N22675)

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 contami-

nated 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 SO

, NO

and most hydrocarbons. If exposed

to high concentrations of harmful

chemicals such as methanol, etha-

nol, or dirt, the lter can deteriorate

and/or impede diusion of CO to

the sensor.

Fieldpiece

Carbon Monoxide

Detector

OPERATOR'S

MANUAL

Model

SCM4

Display

Controls

SCM4

ON/OFF

MUTE

ZERO

MAX

Carbon

Monoxide

Detector

Measures

CO in PPM.

PRESS FOR

1 SECOND

AUTO-OFF

BATT CHECK

Hold for one second to toggle power.

SCM4

ON/OFFMUTE

ZERO

MAX

Carbon

Monoxide

Detector

Measures

CO in PPM.

PRESS FOR

1 SECOND

AUTO-OFF

BATT CHECK

Cancel out any ambient

nominal CO. (See Zero Set.)

SCM4

ON/OFFMUTE

ZERO

MAX

Carbon

Monoxide

Detector

Measures

CO in PPM.

PRESS FOR

1 SECOND

AUTO-OFF

BATT CHECK

Toggle backlight on display.

SCM4

ON/OFF

MUTE

ZERO

MAX

Carbon

Monoxide

Detector

Measures

CO in PPM.

PRESS FOR

1 SECOND

AUTO-OFF

BATT CHECK

Mute the beep. Hold for one second to

check % battery remaining.

(Hold while powering ON to disable APO.)

SCM4

ON/OFFMUTE

ZERO

MAX

Carbon

Monoxide

Detector

Measures

CO in PPM.

PRESS FOR

1 SECOND

AUTO-OFF

BATT CHECK

Show maximum measurement.

How to Use

"Walk Around" Test

The SCM4 responds almost instantly

to changes in CO levels in the air. If

you see a dierence 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 eects 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 specications 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.)

SCM4

ON/OFFMUTE

ZERO

MAX

Carbon

Monoxide

Detector

Measures

CO in PPM.

PRESS FOR

1 SECOND

AUTO-OFF

BATT CHECK

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.

SCM4

ON/OFFMUTE

ZERO

MAX

Carbon

Monoxide

Detector

Measures

CO in PPM.

PRESS FOR

1 SECOND

AUTO-OFF

BATT CHECK

Auto Power O

(APO) Enabled

Real Time CO ppm

Measurement

Maximum CO ppm

Measurement

Instrument Muted

Low Battery

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.

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.

1 2

Fieldpiece 1
Incorrect 2

Summary of Contents

Page 1 - Fieldpiece

01 03 0602 050407 09 1208 1110Quick Start1. Install 9V battery located in the bat-tery compartment.2. Press ON/OFF for 1 second to power on the SCM4

Page 2 - Incorrect

13 15 1814 171619 21 2420 2322CO Detectors and Cracked Heat ExchangersA CO detector cannot tell you if a heat exchanger is good. A CO detector can ind

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