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Orifice Flow Meters
VUA-Series Low Flow Adapters
VUA-561 |
The Apex Instruments VUA-Series Low Flow Orifice Adapters
all feature a calibrated, critical sapphire orifice with
liquid-filled vacuum gauge, brass fittings and inline filter.
These are used to adapt our isokinetic source samplers for
methods requiring low flow sampling.
| Part # |
Flow Rate |
| VUA-561 |
~1 lpm |
| VUA-562 |
~2 lpm |
| VUA-565 |
~0.5 lpm |
| VUA-575 |
~0.5 lpm |
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The VUA-560 Series Adapters are used for VOST
and Method 6-type sampling. These adapters include 1/2 inch
male and 1/4 inch female brass quick connects to attach the
isokinetic source sampler to the VOST VU-cords. Three adapters
are offered to provide approximately 1/2, 1 and 2 lpm flow
rates.
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| The VUA-575 is used for Method 7C to provide
the required flowrate between 400-500cc/min. This adapter
includes 1/2 inch male and 1/2 inch female brass quick connects
to attach the source sampler to the Method 5 U-cords. |
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OFM-Series Orifice Flow Meters (OFM-K4-o)
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OFM-K4-o
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The Apex Instruments OFM-Series Orifice Flow
Meters all feature a calibrated, critical orifice with two
liquid-filled vacuum gauges and inline filter. All fittings,
including the orifice and filter, are made of stainless steel
and include 1/4 inch tube fitting end connections. These adapters
are used with vacuum pumps to provide constant sample flow
rates. Orifice sizes range from 4 to 35 providing flow rates
from 0.076 lpm to 6.1 lpm. |
| Note: To determine critical vacuum,
initially adjust the valves to obtain a sample vacuum of about
1/2 of barometric pressure. Observe the sample flow rate meter.
Slowly increase the vacuum until a stable flow rate is obtained
on the meter. Note and record this as the critical vacuum.
Conduct runs at 25-50mm Hg (1-2 inch Hg) above this critical
vacuum. Pump and orifice combinations that cannot reach critical
vacuum should not be used. |
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