Field Audit Kit

Stack Testing for Hazardous Air Pollutants (HAPx)
Apex Instruments Field Audit Kit

  • Dial Caliper – Used for measuring nozzle diameter and inspection of pitot tubes.  The dial caliper should have graduation units of 0.001 inches.


  • Level Indicator – Used for verification of proper construction dimensions and spacing requirements for Type S Pitot tube. Also used in measuring yaw angle of Type S Pitot tube during verification of absence of cyclonic flow at a sampling location.


  • Thermocouple Simulator Source – Used with the Method 5 meter box for checking accuracy of temperature displays and controllers.  The thermocouple simulator source should be designed for Type K thermocouples with 22 precise test points. The temperature range should be from 0 to 2100°F.


  • Calibration Orifice Set – The Calibration Orifice Set is used for calibrating and auditing Method 5 metering system.  The set should include 5 calibrated orifices with ½ inch quick connects.  In addition, a disk with appropriate software/spreadsheet for performing calculations should also be part of the Calibration Orifice Set.


  • IsoCal Software – IsoCal Software should be a Microsoft Excel workbook designed for integrated isokinetic source sampling calculations.  The IsoCal Software should provide all the worksheets necessary to perform US EPA’s Federal Reference Methods 1 through 5 test setup, data entry and data reduction.


  • Isokinetic Slide Rule or Calculator – The Isokinetic Slide Rule or Calculator performs isokinetic stack sampling calculations to calculate a proper Delta H based upon a Delta P reading, once all the various constants/source parameters have been entered properly into the calculator or performed correctly with the slide ruler.


  • Pocket Barometer – Used to determine atmospheric pressure, readable to within 0.02 inches Hg divisions.


  • Modular Pitot Tube – A Modular Pitot Tube, capable of extension to 1 meter, used to measure stack gas velocity, static pressure and cyclonic flow.  The pitot tube would be used in conjunction with a hand-held digital manometer (0-19.99 inches)


  • Hand-Held Manometer – Used in conjunction with the Modular Pitot Tube.  The hand-held digital manometer (readable to 0.01 inches of water) is a useful alternative to the standard size manometer or magnehelic gauge; and is especially ideal for field monitoring and troubleshooting.  Measures positive, negative or differential air pressure.


  • Hand-Held Digital Thermometers – Used to measure stack temperature and various temperatures associated with the Method 5 sampling train.  Should be a Type K thermocouple coupled to a hand-held control unit with capability of readings in the range of -58 to 1999.9°F.


  • Bull’s Eye Level – Used for indicating level of pitot tube during evaluation with Level Indicator.  The Bull’s Eye Level may also be placed on the pitot tube (has thumb screw clamps) during sampling to indicate proper orientation.


  • Tape Measure – Used to document stack geometry and sampling port location from upstream and downstream disturbances.  Material should be stainless steel and length of 100 feet.


  • Agency Checklist – Various Agency checklist for observing Federal Reference Methods 1 through 5 and specific SW-846 methods (Methods 0010, 0030, 0050, 0051, 0060, 0061).


  • Stack Sampling Nomographs for Field Estimations – Field nomographs used in estimating or checking data used in stack sampling.  Four basic groups of nomographs are helpful to the Agency inspector.  They are:


    1. Moisture nomographs (Wet bulb/dry bulb, combustion calculation, FRM 4, etc.)
    2. Excess air nomographs (Temperature versus excess air, excess air versus composition, etc.)
    3. Velocity and volumetric flow rate nomographs (Coal-fired equipment, volume versus heat input, pitot tube velocity readings, etc.)
    4. Concentration and mass emission rate nomographs (Ppm emissions, pounds per million, BTU, pounds per hour, etc.)