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Thermo DataRAM 4000™ Aerosol Monitor

(Download Manual)(Download Specifications)


The DataRAM 4000 continuously monitors and logs the real-time concentration and median particle size of airborne dust, smoke, mist and fumes. In addition, air temperature and humidity are displayed and recorded. With appropriate particle discriminators, it provides measurements correlated with PM10, PM2.5, PM1.0, and respirable fractions. It's patented two-wavelength particle detection system provides the volume median particle diameter of the sampled aerosol, over a concentration range up to 400 mg/m3. Unlike typical particle counting devices, the DataRAM 4000 is totally immune to particle coincidence errors, even at the highest concentrations. Volume median particle sizes down to 0.05 µm can be measured by this unique spectral nephelometric technique. The DataRAM 4000 monitors the concentrations of fine particulates in ambient air by a combination of aerodynamic size preselection, two wavelength nephelometry, and concurrent sensing/correction for relative humidity.



Concentration measurement range (auto-ranging)1:

0.0001 to 400 mg/m3

Precision/repeatability (2-sigma)

1% of reading or 0.001 mg/m3, whichever is greater (1-second averaging)

0.3% of reading or 0.0003 mg/m3, whichever is greater (10-second averaging)


2% of reading precision


0.1% of reading or 0.0001 mg/m3, whichever is greater

Scattering coefficient range:

10-7 to 0.4 m-1 (resolution: 3 significant digits, max.)

Visual range:

0.01 to 337 km (@ = 550 nm) (resolution: 3 significant digits, max.)

Ångström coefficient measurement range:

0.0 to 4.0

Particle sizing range (log-normal, g = 2.0, m = 1.50):

0.04 to 4.0 m

Temperature measurement range:

-15 to 60 C(accuracy: 0.5 C)

Relative humidity measurement range:

0 to 100% (accuracy: 2%, non-condensing, @ 25 C)

Sampling flow rate range4:

1.0 to 3.0 liters/minute (accuracy2: 0.05 liters/minute; adjustability: 0.1 liters/minute)

Measurement/display integration time range4:

1 to 60 seconds (selectable in 1-second steps)

Measurement/display update frequency:


HEPA filter cartridge replacement frequency (typical):

< I per 5 years (@ < 1 mg/m3)

Alarm level adjustment range4:

Selectable over entire measurement range for any of the selected measurement

units (concentration, scattering coefficient or visual range)

Data logging averaging periods4:

1 second to 24 hours (selectable in 1-second increments)

Data logging memory capacity:

50,000 data points in up to 99 tags (data groups)

Programmable zeroing periods4:

1 to 168 hours (selectable in 1-hour increments; if enabled, logging period must be >

10 minutes)

Elapsed time readout range:

1 second to 100,000 hours (over 11 years), in seconds, minutes and hours

Digital communications:

RS232/RS485: full duplex, 9600 baud, software controlled, device filtered

Computer requirements:

IBM-compatible PC, 486 or higher (Pentium I or higher, preferred); Windows™95 or

higher; 8 MB memory or more

Analog outputs:

0 to 5 V and 4 to 20 mA, with selectable full scale ranges between 0.1 and 400



Internal battery: rechargeable sealed lead-acid, 7.2 Ah, 6 V,

20-hour run time between charges (typical)

AC line: universal voltage charger/power supply (included),

100 – 250 V, 50 – 60 HZ (CE marked)

Optional solar power system, model DR-SOL

Alarm outputs:

Alarm switch: 0 to +30 VDC (off, open), 2.5 A (on, closed)

Alarm signal: 0 V (off), 5 V (on) (1 mA maximum load current)

Audio alarm (back panel): > 60 dB @ 1 m

Operating environment:

-10 to 50 C(14º to 122º F), 10 to 95% RH, noncondensing

Storage environment:

-20 to 70 C(-4º to 158º F)

Dimensions (maximum external, including handle and inlet fitting):

166 mm (6.54 in) H x 226 mm (8.90 in) W x 327 mm (12.87 in) D


5.5 kg (12 lbs)

Toll Free: 1-888-233-3535