Model HD-28A 

The Model HD-28A portable “K-Flow” bench type constant flow air sampler is designed for use on perimeter and off-site monitoring stations in environmental monitoring systems and in production and laboratory areas where collection of precise air samples is required. Its combination vacuum pump and constant air flow regulator permits the collection of an airborne particulate and iodine sample at a constant flow rate until the ΔP across the filter media exceeds the capability of the pump. The higher the flow rate the, the lower the ΔP for constant flow control. The controlled flow rate is adjustable from 0.5 to 3.0 cfm through 47 mm and 2 inch diameter filters (such as fiberglass and membrane types) and charcoal or silver zeolite cartridges used for Iodine-131 collection.

   An internal air filtering system has been installed between the regulator valve and the pump to prevent particulates from reaching the self-adjusting carbon vanes and causing excess wear. A minimum of preventive maintenance assures a long performance life for the pump. A resettable elapsed time meter is mounted on the instrument panel. By setting this timer to zero at the start of each sample period, an accurate sample volume may be readily calculated.

Model HD-28A CONSTANT FLOW
AIR SAMPLER

* CONSTANT AIRFLOW MAINTAINED WITH ΔP  ACROSS THE FILTER OF UP TO 17” OF MERCURY (FLOW RATE DEPENDENT)
* FRONT PANEL MOUNTED AIR FLOW INDICATOR
* ELAPSED TIME METER AND CONSTANT AIR FLOW RATE PERMIT ACCURATE CALCULATION OF SAMPLE VOLUME
* VACUUM GAUGES FOR OBSERVING FILTER LOADING AND PUMP PERFORMANCE
* FLOW RATE INDICATION ON ROTAMETER, CFM OR LPM
* RATED FOR CONTINUOUS DUTY
* LOW NOISE LEVEL
* MINIMUM MAINTENANVE
* QUALITY ASSURED
* ALL UNITS INDIVIDUALLY CALIBRATED AND TRACEABLE TO NIST

Specifications

Air Flow Rate
* Adjustable from 0.5 to 3.0 CFM (15 to 85 LPM)
Air flow Regulation
* ±5% of set air flow rate up to maximum capability of pump
Dimensions/Weight
* 18” Long X 11” Wide X 9” High
* (45.7 cm X 27.9 cm X 22.9 cm)
* 35 lbs (15 kg)
Power Requirement/Cable
* 115V, 60Hz, 8 Amps
* 230V, 50Hz, 4 Amps
* Three wire cord; six feet; 10 Amp rating; UL and CSA approved. British and European available.
Air Flow Indicator
* Venturi mounted rotameter.
Air Mover/Motor
* Self-adjusting carbon vane type. Pump is designed for continuous operation at 26” Hg vacuum. 1/4 horsepower; thermal over load protection.
Input Connection
* 3/8” Female Quick Disconnect
Unit Cooling
* 120 CFM extra high flow at maximum back pressures.
* All metal continuous duty fan.
* Resettable Elapsed Time Meter
* 9999 hours and 60 minutes, pushbutton resettable.