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 |
|
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.
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. |
OFM-Series Orifice Flow Meters (OFM-K4-o)
|
OFM-K4-o
|
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. |
