Fieldpiece ACM3 - Carbon Monoxide Accessory Head Bedienungsanleitung PDF herunterladen

Carbon Monoxide

Accessory Head

Model: ACM3

OPERATOR’S MANUAL

Description

The model ACM3 carbon monoxide accessory

head enables most digital multimeters to measure

low levels of carbon monoxide in parts per million

(PPM). It is intended to measure levels of CO in still

ambient air. In many cases, it can help pinpoint

sources of CO.

It uses a catalytic chemical sensor that con-

sumes no chemicals. Life is primarily determined by

the type of exposure.

The most practical application is to determine if

the indoor CO levels are higher than outdoor levels

and to determine the source. This instrument

detects changes in CO levels very quickly.

"Walk around" test

The ACM3 is fast enough to respond almost

instaneously 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 highest concentration, you can

determine the source of the CO. It may be that

someone just drove their car into the garage and

opened the kitchen door and you don't have to take

any action. Or it could be that the furnace is starved

for air and that CO is entering the house. You've got

to fix that.

How to use

1. Connect to COM and Volts jacks using the

Fieldpiece deluxe test leads. For Fieldpiece

“stick” meter, slide the head directly over the

meter.

2. Select the 2000mVDC range.

3. Turn on. Let stabilize 45 seconds.

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 final reading when

reading stabilizes.

6. For initial tests, walk around the building, watch-

ing for the readings to go up to determine where

maximum concentrations of CO are. To meas-

ure air from register, use a pump or measure

out of the air stream. Hot blowing air can

adversely affect the reading. The temperature of

the sample must be near ambient.

Zero adjust

As needed, adjust reading to zero in a known

zero CO atmosphere and in temperature similar to

the sample air to be tested and when ambient air is

within specifications and head is in equilibrium

(temperature and relative humidity) with ambient.

Specifications

Range: 0 to 1000PPM (2000PPM with 5 minute

max exposure time.)

Initial accuracy:

0-15ppm ±5% reading ±1 ppm after zeroing

15-35ppm ±5% reading ±2 ppm after zeroing

0-1000ppm ±5% reading ±5ppm after zeroing

Accuracy: Stated accuracy at 73ºF±9ºF, <90%

relative humidity

Response time: <70sec to 90% of reading

Operating temperature: 32 to 105 ºF

Operating relative humidity: 15 to 90%RH, non-

condensing

Storage temperature: -4ºF to 140ºF, 0 to 80%

R.H. with battery removed from meter.

Long term drift: <5% / year (depending on use)

Sensor calibration: Factory calibrated on

205ppm

Sensor type: Electrochemical (specific to CO)

Battery life: 200 hours typical. No measurable

current draw when in "off" position.

Battery: 9V

Average switch

The average switch averages the readings over

the last two or three seconds. This allows the user

to read more stable measurements.

CO detectors and cracked heat

exchangers

A CO detector cannot tell you if a heat exchang-

er is good. A CO detector can indicate a heat

exchanger maybe be cracked only if all of the fol-

lowing conditions occur simultaneously:

1. The flame generates high concentrations of CO

(lack of oxygen, excess fuel, high temp).

2. Enough exhaust gases are emitted from the

heat exchanger crack.

3. The exhaust gases from the crack are not dilut-

ed too much before coming in contact with the

sensor. A cracked heat exchanger may leak CO

in a small stream. You may measure high con-

centrations at one point but low concentrations

only an inch away.

4. The heat exchanger is the only possible source

for the CO detected.

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.

2. Do not take readings directly in stream of air at

3. Allow enough time for accessory head to reach

ambient temperature and RH%.

Air being measured must be stable and between

32ºF and 105ºF and 15%RH and 90 %RH.

Temperature and humidity changes can cause tran-

sient readings. For best results, use a AOXP2 pump

to sample the air, cool it to near room temperature,

and raise the relative humidity.

CO exposure effects

Effects can vary significantly depending on

age, sex, weight, and overall health.

Coffee cup test

To demonstrate that your CO head 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 cre-

ating carbon dioxide and now you're starting to pro-

duce CO (carbon monoxide). Bring the flame in and

out of the mouth of the coffee cup to just keep the

flame alive. The longer you keep the flame flicker-

ing, the more CO you produce. After 10 seconds of

flickering, extinguish the flame 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 ppm Effects

9 ppm

Minimal. Max allowable concentration

for eight hours (EPA and ASHRAE).

35 ppm

Max for continuous exposure for one

hour (EPA and ASHRAE).

50 ppm Max for eight hours (OSHA).

100 ppm

Trips installed CO detectors. UL2034

specifies a max exposure of 100 min.

200 ppm

In two to three hours: slight

headache, tiredness, dizziness,

nausea. UL2034 specifies a max

exposure of 35 min.

400 ppm

In one or two hours: frontal

headaches. In three hours: life

threatening. UL2034 specifies a max

exposure of 15 minutes.

800 ppm

In forty five minutes: dizziness,

nausea, and convulsions.

800 ppm In two to three hours: death.

1600 ppm In one hour: death.

6400 ppm In fifteen minutes: death.

12800 ppm In three minutes: death.

WARNING

Do not take measurements directly at a

tailpipe, in a furnace flue, or at a register. See

precautions.

Do not rely solely on a carbon monoxide

measurement to determine if a heat exchanger

is bad. See paragraph on left.

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Carbon MonoxideAccessory HeadModel: ACM3OPERATOR’S MANUALDescriptionThe model ACM3 carbon monoxide accessoryhead enables most digital multimeters to m

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StorageDo not store in areas which contain solventvapors. This includes aerosols such as air-freshen-er, wax polish, window cleaner, and all organic s

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