Regulated
Air Sampler
Model RAS-1
• PORTABLE AIR-PARTICULATE SAMPLER
• OPTIONAL IODINE CARTRIDGE HOLDER
• FLOWMETER AND VACUUM GAUGE
• 47-mm FILTER HOLDER
Eberline ~~;=J~framenf
Systems Inc.
RAS-1
Model RAS-1, Regulated Air Sampler
GENERAL DESCRIPTION
The Model RAS-1 is a compact, portable air particulate sampler containing an oil-free vacuum pump,
motor, airflow regulator, flowmeter, vacuum gauge
and filter holder.
permits the pump to operate at a minimum
pressure drop at all times, which provides cooler
pump operation to extend the lifetime.
The Eberline airflow regulator is designed to maintain a constant pressure drop across an in-line orifice by controlling a variable bypass valve into the
pump. The orifice is adjustable, permitting flow rate
adjustment from near zero up to the maximum
pump flow capacity. This flow control system
Some RAS-1 operating curves are shown below.
The top line is the pump operating curve. The
curves below the pump operating curve show how
the sample inlet flow varies with intake vacuum for
two different regulated settings. After the regulator
is set at a particular inlet flow the sample flow rate
follows a similar curve, decreasing as intake
vacuum increases.
SPECIFICATIONS
AVAilABLE
ACCESSORIES
Pump Type: Oil-free, carbon vane
Iodine Cartridge
Motor: V4 Hp, 115V, 60 Hz, 5 A
(220 V, 50 Hz optional)
Maximum
Iodine Cartridge:
Vacuum: 19 inches Hg at sea level
Holder: Mode11CH-1
Part No. IC-1
Calibration Adapter: Model ZP10758009
(Mates FH-1 to 1-inch NPT)
Flow Rates: See figure
Filter Holder: Model FH-1, 47-mm
Elapsed Time Meter: (1000 hour): Model RAS1
ETM
Flow Meter: 0 to 100 Llmin (0 to 3.5 fP/min)
Filter Paper: Part No. FIFP8, 47-mm
Vacuum Gauge: 0 to 30 inches Hg
(0 to 760 mm Hg)
RAP-1 Pump Repair Kit: PURK3(1)
Size: 17.75 inches long, 7 inches wide, 11 inches
high (45.1 cm x 17.8cm x 27.9 em)
Regulator
Repair Kit: RAP1R RK1(3)
Pump and Regulator
Repair Kit: RAP1 RK2(4)
Weight: 35 pounds (15.9 kg)
Calibration
The unit is supplied with a three-point flow calibration using a mass flowmeter.
PERfORMANCE
CURVES,
RAS·'
PUMP
'0
2.0
2.1
-i
Op •• oti"g
COl •••
, 2.12
scr •••
Calibration Adapter (Shown with Mass Flowmeter
attached) Mass Flowmeters are not sold by
Eberline.
Eberline
A subsidiary of Thermo Instrument Systems Inc.
10
VACUUM
9-90
(in
17
Hg)
..
P. 0. Box 2108
Santa Fe, New Mexico 87504-2108
(505) 471-3232
FAX: (505) 473-9221