| The Grimm 1.107 monitor performs particulate size
measurements by 90-degree laser light scattering. Air with multiple particle sizes passes
through a flat laser beam produced by an ultra low maintenance laser diode. A 15-channel
pulse height analyzer for size classification detects the scattering signals. Due to the
lack of a sample heater inlet even aerosols and semi volatile liquid particles can be
identified. These counts from each precisely sized pulse channel are converted to mass
using a well-established equation and the data is then formatted for USA EPA categories of
PM10 and PM2.5. The user can also program several
averaging functions.  The Environmental Weather Housing, Model 165, consists
of a fiberglass frame that supports the optical instrument (# 107) on a central mounting
plate. All the electronic and mechanical components, such as the moisture absorbent
container, the ventilation system, the heating and control system, the temperature and
humidity sensor, and the DC power supply, are mounted on the same frame to minimize
vibration.
The Sampling System of Model 170M consists of our proven omni-directional sampling head
inside a rain and 2 mm particle eliminator as well as a dry air mixture and a heater
system, all built into a 50cm inlet tube.
GRAVIMETRIC OPERATION
Inside the 1.107 unit is a removable PTFE 47mm filter (in accordance to PM2.5).
All sampled dust is collected on the filter and a gravimetric and/or chemical analysis may
be made later. This unique combination ensures a perfect site-specific field
calibration and monthly revalidation.
Key Features
- E P A - Under EPA for PM10 evaluation, also PM2.5
candidate, even capable of sub micron (PM-1 ready) dust mass
- Real Time measured data are storable on data logger from one minute to one day
averages
- Temperature Controlled Housing - set for 22oC
- Moisture Compensation System - programmable by user
- External Temperature and Humidity Sensors - are standard items
- Auto Zero instrument software performs an optical system electronic and pump
check upon startup
- Data Logging System - removable memory card for storing data from one day
to one year, makes this an easy way to transport data to PC
- Corrosion Resistant Housing - made of polished stainless steel and also available
as fiberglass.
- Tamper Resistant Lock - mounted on a sturdy support base
- Portable - 40x40x20cm (15.5" x 15.5" x 8"), weight 15.9 kg (33
lbs.)
- Dual Technologies - both light scattering and regulatory-compliant gravimetric
methods are standard features
- Optional - can present the particle counts in 15 different size channels in real
time
- Software - GRIMM's WINDOWS 95™ compatible data presentation and
analysis program allows many viewing and organizing modes
- Low Maintenance - usually only three months for filter exchange
- Power Supply - 18V DC by battery , but also at 110/60 or 220/50
In accordance to the final rule of the United Stated federal regulation for 40
CFR,
section 53, this automated system is being evaluated as an EQUIVALENT method for PM10
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