Fieldpiece SCM4 Скачать руководство пользователя страница 1

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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 

off.

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 field 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 flue.

3.  Allow enough time for SCM4 to reach 

ambient temperature and %RH.

4. The sensor has built-in permanent 

non-replaceable filter to filter out 

trace concentrations of SO

2

, NO

2

and most hydrocarbons. If exposed 

to high concentrations of harmful 

chemicals such as methanol,  etha-

nol, or dirt, the filter can deteriorate 

and/or impede diffusion 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/OFF

MUTE

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/OFF

MUTE

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/OFF

MUTE

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 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 effects 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 specifications 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/OFF

MUTE

ZERO

MAX

Carbon 

Monoxide 

Detector

Measures 

CO in PPM.

PRESS FOR

1 SECOND

AUTO-OFF

BATT CHECK

Specifications

Sensor Type

: Electrochemical (specific 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 Off

:  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/OFF

MUTE

ZERO

MAX

Carbon 

Monoxide 

Detector

Measures 

CO in PPM.

PRESS FOR

1 SECOND

AUTO-OFF

BATT CHECK

Auto Power Off 

(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 flue. 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 significant CO concentration immediately. See the CO Exposure Effects section of this manual.

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