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    In-Situ Dilution Probes
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Critical Orifices
   
 
Pyrex® Glass Critical Orifices
    Monel® Critical Orifices
    Quartz Critical Orifices
    OEM Production


Dilution Instrument Services
    In-Situ Dilution Probe Services
    Out-Of-Stack Probe Services
    Critical Orifice Services

In-Situ Dilution Probe Heaters
   
 
Complete Heater Assemblies
    
Stack-Tester Version
    
C22 Alloy & Halar Series

Extension Pipe Assemblies
    In-situ Probe Extensions
    Custom Weldments

Spare Parts and Consumables
    In-Situ Dilution Probe Parts
    OOS Diluting Sampler Parts
    Obsolete Probe Heater Parts
    Custom Manufactured Parts

We have a wide range of standard Critical Orifice (sonic orifice) styles and flows to suit your diluting application. Critical Orifice styles for use with your in-situ and out-of-stack diluting sample probes, inertial filter diluting probes, laboratory diluters and more.

Standard Materials include Glass, Quartz and Monel®. Standard Max. Temperatures up to 750°F (400°C), High Temperature Critical Orifices (Sonic Orifices) are available for your applications up to 1000°F (540°C).

For our OEM Customers, we offer custom designed critical orifices to meet your specific needs.

ASI is a proven leader for Quality Parts and Best Selection of critical orifice flows and materials you will find for your dilution systems.


- Critical Orifices (Sonic Orifices) Glass, Quartz, & Metal Orifices Dilution Probe Applications -

Critical Orifice -- P/N CO-STK1-XXXML:
Material
Glass | Filter Quartz Wool/Glass Frit | Max. Temp. 750°F (400°C)
Application: This style of critical orifice ("sonic orifice" ... "glass orifice") is for use with standard in-situ and out-of-stack diluting sample probes. Standard nominal flows are 20, 50 and 100ml/min. Replace "XXX" in Part Number to specify nom. flow (e.g., CO-STK1-020ML = Nom. 20ml/min glass critical orifice). Special flows upon request.

Critical Orifice Assemblies -- P/N CO-STK2-XXXML:
Material Monel® | SS Pre-filter Quartz Wool/SS Frit | Max. Temp. 1110°F (600°C)
Application:
This style of critical orifice ("sonic orifice" ... "Monel® orifice") is for use with standard in-situ and out-of-stack diluting sample probes. For in-situ probes when temp is too high for the standard glass orifice. Orifice has Swagelok® 1/4" tube connection on outlet, open inlet. Standard nom. flows are 20, 50 and 100ml/min. Replace "XXX" in Part Number to specify nominal flow (e.g., CO-STK2-050ML = Nom. 50ml/min Monel® critical orifice assembly). Special flows upon request.

Critical Orifice -- P/N CO-STK3-XXXML:
Material
Monel® | Pre-filter N/A | Max. Temp. 1110°F (600°C)
Application:
This style of critical orifice ("sonic orifice" ... "Monel® orifice") is the same as the above noted Monel® critical orifice assembly, but does not include the Pre-filter. For use with out-of-stack w/inertial filter samplers and mixing boxes. Orifice has Swagelok® 1/4" tube connection on inlet & outlet, overall length is 1-1/2". Standard nom. flows are 20, 50 and 100ml/min. Replace "XXX" in Part Number to specify nominal flow (e.g., CO-STK3-050ML = Nom. 50ml/min Monel® critical orifice assembly). Special flows upon request.

Critical Orifice -- P/N CO-STK5-XXXML:
Material Glass | Filter Glass Frit (no wool) | Max. Temp. 750°F (400°C)
Application: This style of critical orifice ("sonic orifice" ... "glass orifice") is for use with Stand Alone Diluting Modules (Diluting Units) and Laboratory Diluters. These are configured with a 1/4" OD stem inlet and outlet. The maximum Operating Temperature (as noted above) is for the critical orifice only ... actual operating temperatures may be limited to a lesser maximum temperature by the orifice joining fittings and/or aspirator pump materials, mounting brackets, connective sample lines etc. Standard nominal flows are 20, 50 and 100ml/min. Replace "XXX" in Part Number to specify nom. flow (e.g., CO-STK5-020ML = Nom. 20ml/min glass critical orifice). Special flows upon request.

Critical Orifice -- P/N CO-STK4-XXXML:
Material Quartz | Pre-filter Quartz Wool/Quartz Frit | Max. Temp. 1000°F (540°C)
Application:
This style of critical orifice ("sonic orifice" ... "quartz orifice") is for use with the original "High Temperature" version of the in-situ diluting sample probes. This specially made critical orifice has a ball end on the stem end, and is secured to the diluting probe tip using a special Inconel® treated compression spring (with SS adaptor piece) which seats the orifice ball end into a cup fitting (against a gold foil washer) on the probe tip. Standard nom. flows are 20, 50 and 100ml/min. Replace "XXX" in Part Number to specify nominal flow (e.g., CO-STK4-050ML = Nom. 50ml/min Quartz critical orifice). Special flows upon request.


NOTE: This configuration has become obsolete since the STK2 series design (Monel®), which is a simpler configuration, less expense, but capable of the same high temperature range. However, we do still support the Quartz style critical orifice assembly for those customers that require it.

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Alpha Suite Inc.  2017