DF-22 Specifications

NOTABLE FEATURES:

Display in Metric or English units to be set at factory.

Choices of flow/volume units:

FLOW	VOLUME
sccm	scc
SLPM	SL
SCMH	SCM
SCFM	SCF

State-of-the-art microprocessor electronics

Flow rate measurement and volume totalizations are corrected to a factory settable Reference Temperature and Pressure (4 options available)

Classical STP	0° C	1 Atm
Normal T and P	20° C	1 Atm
Modified Normal T and P	70° C	1 Atm
Standard Ambient T and P	25° C	1 Atm

Bright LED display
Flowrate accuracy ±4% F.S.
Elapsed time meter
RS-232 Communication Port; w/Operator selectable download frequency for real-time data
Auto zero calibration feature of flow sensor
Optional FlaschCard Datalogger for capture and storage of real-time data from RS232 port.

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Model: DF-22 110V
Model: DF-22E 220V

GENERAL DESCRIPTION:
The Model DF-22E environmental air sampling system with digital flowmeter is a low-volume air sampler consisting of an oil-less, carbon vane vacuum pump, with a constant air flow regulator for use where a nearly constant air flow is desirable. The regulator holds a constant pressure drop across an in-line orifice, by varying the flow through a bypass valve into the pump. This system allows the pump to work at a minimum pressure drop at all times, permitting it to run cooler, thus extending its service life. The oil-less pump requires no lubrication to maintain optimal efficiency during its service life. The pump is mounted on a removable base plate, which can be secured within the WH-3 weatherhouse.

The DF-22E environmental air sampling system is designed for continuous outdoor use. Please consult the product specifications for the design temperature range and the installation category. Standard product displays flow rate, elapsed time and totalized volume by operator selection.

The typical operating range is 0.5 to 4 CFM (14 – 115 LPM).