Related Manuals for Oriflow Cobra
Summary of Contents for Oriflow Cobra
- Page 1 Operating Instructions for Cobra and Lynx Duct Leakage Testers (Metric) © Copyright 2017 ORIFLOW LLC...
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Page 2: Table Of Contents
Determining Leakage Rate……………………………… 15 – 17 Troubleshooting Can’t obtain system test pressure ……………………… Zero reading on “DUCT SYSTEM” gauge …………..Zero reading on “ORIFICE TUBE” gauge …………….. “ORIFICE TUBE” gauge reading maxed out………..© Copyright 2018 ORIFLOW LLC Rev: 03/2018... -
Page 3: Introduction
These operating instructions are for ORIFLOW models COBRA and LYNX air leakage testers. Take pride in knowing that you have purchased the best air leakage tester on the market. It is no secret that Oriflow manufactures the highest quality testers, and has unparalleled customer service and technical support. -
Page 4: Prior To Testing
Do you have an adequate power supply for your tester (see Table 2)? Table 2 – Tester Amp Draw Flow Control Full Load Tester Model Voltage Option Amps Lynx Slide Gate 12.7 Cobra Slide Gate 12.8 Cobra 14.0 Cobra Slide Gate Cobra © Copyright 2018 ORIFLOW LLC Rev: 03/2018... -
Page 5: Extension Cord Requirements
If the specification uses SMACNA Leakage Class or Pressure Class, you will need to calculate the total duct system surface area. Oriflow has FREE Adobe forms available that will calculate duct surface area given the duct shape, dimensions and length (www.oriflow.com/freeform). These forms also calculate Leakage Factor, allowable leakage and Pass/Fail criteria among other calculations. -
Page 6: Determining Which Orifice Plate To Use
For example, if you are testing a system at 1000 Pa pressure and the maximum allowable leakage is 165 L/s, you will need a 76 mm orifice plate if using the Cobra tester (see Table 6) or a 102 mm plate if using the Lynx tester (Table 7). - Page 7 2000 Table 7 – Tester Capacities using the 102 mm Orifice Plate COBRA Tester System Static Minimum LYNX Tester Maximum Pressure Leakage* Maximum Leakage (L/s) (Pa) Leakage (L/s) (L/s) 1000 1250 1500 2000 © Copyright 2018 ORIFLOW LLC Rev: 03/2018...
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Page 8: Install Orifice Plate And Upper Tube Section
Refer to Figures 1 through 4. Figure 1 – Install Orifice Plate and then Rotate Clockwise Figure 2 – Rotate Orifice Plate Clockwise until it Locks in Place © Copyright 2018 ORIFLOW LLC Rev: 03/2018... - Page 9 After the orifice plate is locked in place, place the upper tube section over the bolt/wing nut set, rotate clockwise, and tighten wing nuts (Figures 3 and 4). Figure 3 – Install Upper Tube Section and Rotate Clockwise Figure 4 – Tighten Wing Nuts after Rotation © Copyright 2018 ORIFLOW LLC Rev: 03/2018...
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Page 10: Connect Flexible Duct To Orifice Tube
Make sure the connection is a sturdy, sealed tight connection. You don’t want to create a leaky connection thereby adding to the system leakage. Figure 6 – Connection to Duct System © Copyright 2018 ORIFLOW LLC Rev: 03/2018... -
Page 11: System Test Pressure Connection
Using putty or duct tape, seal the connection. See Figure 8. Figure 7 – Connection to Duct System using Static Pressure Tap DUCT SYSTEM pressure tubing inserted into duct system Figure 8 - Static Pressure Tubing Connection © Copyright 2018 ORIFLOW LLC Rev: 03/2018... -
Page 12: Duct Leakage Test Setup (Supply)
See Figure 9 for the test setup for SUPPLY duct system testing (positive pressure testing). On the backside of the DUCT SYSTEM pressure gauge, move the pressure tubing to the pressure port labeled SUPPLY SYSTEM. Figure 9 – Duct Leakage Test Setup for a SUPPLY System © Copyright 2018 ORIFLOW LLC Rev: 03/2018... -
Page 13: Duct Leakage Test Setup (Return/Exhaust)
You will determine the leakage of the system since the air drawn from the blower is discharged through the orifice plate which you are measuring. Figure 10 – Duct Leakage Test Setup for a RETURN/EXHAUST System © Copyright 2018 ORIFLOW LLC Rev: 03/2018... -
Page 14: Zeroing Pressure Gauges
6. Press MENU button two times to get back to the pressure reading. 7. Pressure should be reading zero or within +/- 4 Pa. If not, repeat steps. © Copyright 2018 ORIFLOW LLC Rev: 03/2018... -
Page 15: Avoiding Over-Pressurization
Pressing and holding the UP button will increase speed more quickly. See Figure 13. Figure 13 – Obtaining System Test Pressure (inlet slide model on left, VFD speed control model on right) © Copyright 2018 ORIFLOW LLC Rev: 03/2018... -
Page 16: Obtaining System Test Pressure
Always refer to the calibration certificate(s) that came with your calibrated orifice plate(s). Figure 15 –ORIFICE PLATE Gauge Reading (analog on left, digital on right) © Copyright 2018 ORIFLOW LLC Rev: 03/2018... - Page 17 Using a calculator, take the square root of the gauge reading first, and then multiply by the constant for your orifice plate (for this example, the constant is "8.733"). The exact leakage is 8.733 x (square root of 725) = 235.1 L/s. © Copyright 2018 ORIFLOW LLC Rev: 03/2018...
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Page 18: Troubleshooting
Oriflow has a FREE Adobe format Duct Test Summary Sheet available that will calculate the leakage, leakage factor, allowable leakage, Pass/Fail criteria and duct surface area among other variables (www.oriflow.com/freeform). Files are available for SMACNA or DW/143 requirements. Troubleshooting Can’t obtain system test pressure (THIS IS THE MOST COMMON ISSUE) This happens when the system is leaking too much air. -
Page 19: Zero Reading On "Duct System" Gauge
Uncured duct sealant blow-thru (follow manufacturer instructions for cure time), Improperly sealed or un-sealed joints, Hot water coils and electric heaters, Open duct end that was supposed to be sealed/capped-off for the leak test. © Copyright 2018 ORIFLOW LLC Rev: 03/2018... -
Page 20: Zero Reading On "Orifice Tube" Gauge
Scenario 2: orifice plate bore could be too small, causing a high pressure drop at low to moderate flows. You need an orifice plate with a larger bore. ORIFLOW LLC www.oriflow.com 2125 Range Rd., Unit B Clearwater, Florida 33765 727-400-4881 (phone) 877-420-7091 (fax) sales@oriflow.com © Copyright 2018 ORIFLOW LLC Rev: 03/2018...
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