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Gas Sampling & ISO-Kinetic Sampling Probes

Ordering Information

HI-Q Environmental Products Company's product line includes complete stack sampling systems, consisting of a specified type of probe, in-line filter holder, the transport line, sampling pump and flow controller. We recommend, design, and supply complete systems. HI-Q Environmental Products Company is able to make stack-sampling systems design suggestions by receiving your sampling requirements and operating conditions. System design begins by providing HI-Q with the following information:

  • Stack Flow Rate or Range: (i.e. 35,000 CFM)
  • Sample Point Stack Dimensions: (i.e. 36" Dia. Stack)
  • Sampling flow rate: (i.e. 50 LPM)
  • Sample Collection Media: (i.e. 47 mm diameter Glass Fiber)
  • Location of analysis station with respect to the sampling location: (i.e. distance, layout etc.)


Stainless Steel Sampling Flanges

For Round Stacks or Ducts

Part Number Stack Diameter Probe Diameter
SSFLNG-50-XX -XX 1/2"
SSFLNG-75-XX -XX 3/4"
SSFLNG-100-XX -XX 1"
SSFLNG-125-XX -XX 1 1/4"
SSFLNG-150-XX -XX 1 1/2"

XX=Exact Outer Diameter of Round Stack/Duct
Add "-M" to P/N for Multi-Point Probe Applications
Add "-S" to P/N for Shrouded, Single Point, or Gas Probe Applications

For Rectangular Stacks or Ducts

Part Number Minimum Flat Surface Area Probe Diameter
SSFLNG-50 49 square inches 1/2"
SSFLNG-75 64 square inches 3/4"
SSFLNG-100 64 square inches 1"
SSFLNG-125 64 square inches 1 1/4"
SSFLNG-150 64 square inches 1 1/2"

Add "-M" to P/N for Multi-Point Probe Applications
Add "-S" to P/N for Shrouded, Single Point, or Gas Probe Applications For Round Stacks or Ducts


Single Point & Gas-Only Point Stainless Steel Sampling Probes (without nozzle)

HI-Q precision bends stack and fume hood-sampling probes from stainless steel tubing. Precision-machined nozzle tips may be added from the "Custom Machined Stainless Steel Sampling Nozzles" section. Single-point particulate probes are custom manufactured to customer specifications.  Multipoint Gas Probes are custom designed to customer specified stack dimensions. 

Order XX = length after 90º Tube OD Min Bend Radius (5 X Tube OD)
SS-PG50-XX 1/2" N/A
SS-P50-XX 1/2" 2 1/2"
SS-P75-XX 3/4" 3 3/4"
SS-P100-XX 1" 5"
SS-P125-XX 1 1/4" 6 1/4"
SS-P150-XX 1 1/2" 7 1/2"

"-XX" Tube Run after 90° Bend or Exact Stack dimensions for Gas Probe applications


Multi-Point Stainless Steel Sampling Probes

HI-Q designs and manufactures multi-point stainless steel probes meeting ANSI-N13.1 guidelines. Multi-Point probes are custom designed to meet the end users needs.

Order XX = length after 90º MAIN TUBE OD Min Bend Radius of each point (5 X Tube OD)
SS-P50-XX-P 1/2" 2 1/2"
SS-P75-XX-P 3/4" 3 3/4"
SS-P100-XX-P 1" 5"
SS-P125-XX-P 1 1/4" 6 1/4"
SS-P150-XX-P 1 1/2" 7 1/2"

"-XX" = Tube Run after 90° Bend
"-P" = Number of sampling points (drops)


Custom Machined Stainless Steel Sampling Nozzles

HI-Q precision machines stainless steel nozzle tips. The slip dimensions are based on standard stainless steel tubing. Specify the nozzle tip opening upon ordering by replacing the "XXX" in the order number.

Order (XXX=Tip Opening) TUBE OD Nozzle Tip Opening Range
SS-25NOZ-XXX 1/4" 0.025" to 0.194"
SS-50NOZ-XXX 1/2" 0.125" to 0.444"
SS-75NOZ-XXX 3/4" 0.250" to 0.680"
SS-100NOZ-XXX 1" 0.375" to 0.930"
SS-125NOZ-XXX 1 1/4" 0.750" to 1.180"
SS-150NOZ-XXX 1 1/2" 0.875" to 1.430"

"-XXX" = Tip Opening


Stainless Steel Shrouded Probe Selection

Single Point Shrouded Probe selection is based on a range of Stack Velocities & Sample Flow Rates. Choose the correct shrouded probe from the table below:

Probe Designation Nominal Sampling Velocity
Rate, LPM
Range (m/s) for which
0.8 </= Td" </=1.3
RF-2-111 57 (2 CFM) 0 to 24
RF-3-111 85 (3 CFM) 1 to 25
RF-2-112 57 (2 CFM) 0 to 16
RF-3-112 85 (3 CFM) 1 to 25
RF-2-113 57 (2 CFM) 0 to 5