RAM 2000 Uživatelská příručka stáhnout pdf (Strana 4)

Inline impactor head model DR-PM

10/2.5

2.5

conversion nozzle

25-millimeter-diameter

glass fiber filter holder

The DataRAM 2000 particulate monitor is a compact, self-con-

tained instrument that internally estimates the mass concentration

of particulate in the air from the measured scattering of light. The

instrument can measure particulate concentrations from 0.1 to

400,000 micrograms per cubic meter of air. The instrument

continuously displays the current and time-weighted average

(TWA) mass concentration while logging up to 10,000 data

points. Data can be transferred from the instrument to a laptop

computer through the laptop’s RS-232 serial port.

The DataRAM can be configured with either a PM

2.5

or PM

inlet head to prevent particles larger than 2.5 or 10 micrometers,

respectively, from entering the optical chamber where particu-

late is measured. The DR-PM

10/2.5

model of the DataRAM 2000

is shipped for PM

operation. To convert the inlet to PM

2.5

operation, a conversion nozzle is threaded onto the central flow

tube. The PM

2.5

micrometer inlet is recommended for monitoring

smoke (figure 1).

The impactor surface consists of a 25-millimeter-diameter glass

fiber filter supported by one section of a standard plastic filter

holder. Replace the glass filter when it has any brown or black

soiled spots. Refer to the instruction note provided with the

model DR-PM

10/2.5

inline impactor head. A 37-millimeter filter

located in the instrument’s base can collect particulates for

custom calibrations, or for analyzing the chemical composition

of particulates. An inline heater should be installed for conditions

above 70 percent relative humidity. The inline heater requires

120-volt line power. Humidity of 70 percent and above may

occur at any time in the early morning, even during low-humidity

days. The tubular heater is designed to evaporate liquid water

from airborne particles or to eliminate fog droplets. The Data-

RAM is powered by an internal rechargeable battery or by an

external dc or ac power source. The Missoula Technology and

Development Center (MTDC) recommends having 120-volt

line power available for the DataRAM and inline heater.

The DataRAM 2000

Figure 1—Inline impactor head with the PM

2.5

nozzle installed.

The DataRAM is not approved by the U. S. Environmental

Protection Agency (EPA) as a reference method sampler. The

DataRAM instrument provides general trends of smoke partic-

ulate concentration. These data can enable the user to verify

whether the impacts of smoke particulate are increasing or

decreasing. A correction factor of 0.48 is applied to the DataRAM

based on experimental data. In other words, if the DataRAM

shows 100 micrograms of particulate per cubic meter of air, an

EPA-approved reference method sampler would be expected

to show about 48 micrograms of particulate per cubic meter

of air.

The center published

Real-Time Smoke Particulate Sampling:

Fire Storm 2000

(0125-2832-MTDC) which explains EPA air-

quality standards and how the DataRAM 2000 correction

factor of 0.48 was determined.

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