DF-804V.2 Digital High Volume Air Sampler

NOTABLE FEATURES:

Precision machined venturi flow sensor
Microprocessor controlled electronics
Flow rate measurement and volume corrected to STP
Display in English or metric units
Programmable chain of custody identification
RS-232 communication port
Flow rate accuracy with ± 3% of full scale
Auto zero calibration feature of flow sensor
Various sampling modes to select from
Data storage up to 10,20,30 or 60 days
Multiple on-board calculations with display
220-240VAC, 50/60Hz; single phase
Vacuum Fluorescent Display; 2×24 characters
Wide temperature range electronics
Lightweight

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GENERAL DESCRIPTION:
A lightweight semi-portable environmental high volume air sampling system designed for emergency monitoring activities to determine ambient air pollutants. The unit can easily be assembled in the field.

For durability and weather resistance, the system is housed in a freestanding powder coat painted aluminum enclosure. The sample air is drawn in under the stainless steel rain cover and is exhausted near the bottom of the enclosure. The locking swing door on the enclosure provides convenient access for servicing the equipment inside. A lockable latch on the door restricts unauthorized tampering with the controls.

The electronic flow control measurement sub-system of the DH-804EV.2 Series provides a standard flow measurement and a constant flow of air through the filter medium. The air velocity is measured by a precision-machined venturi. The controller can be readily set to any sampling flow rate between 20 and 50 CFM depending on the filter paper air resistance and dimensions. The bright VFD readout displays multiple air sampling information including current flow rate, average flow rate, current temperature and totalized volume. The filter holder can be custom designed to accommodate any filter size and type. The DH-804EV.2 model utilized a 4" (102mm) diameter filter. Optional software is available to download air-sampling data to a PC or PDA via an RS-232 port. The PC software provides a monitoring report, file creation and setup via a laptop computer.