Oriflow, LLC
727-400-4881
You are here: Home / Products / Cobra Tester

Cobra Tester

The Cobra model duct leakage tester is a great all around tester.  It can test 90 to 95% of the jobs you’ll encounter.  If you don’t plan on testing at pressures greater than 9 in.wg., you can’t go wrong with the Cobra.  Standard unit includes digital gauges and panel mounted variable speed controller, but you can opt for analog gauges and/or inlet damper instead. 

Features

  • Measure leakage from 9 to 680 cfm

  • 115v/1ph operation

  • Variable speed controller

  • Quick-change orifice plates

  • Digital gauges

  • 12-1/2 ft flex (5-inch diam.)

  • 20 ft pressure tubing

  • Calibration certificates

  • 15 amp circuit

  • No-flat tires

  • Upper locking swivel casters

  • Everything labeled for easy use!

Capacity (English)

Use the table below to determine the range of air leakage you can test with the Cobra using our standard orifice plates.

Test Pressure
(in.wg.)		 Recommended Flow Range of Orifice Plate
Optional Low-Flow Plate 1 in Plate 2 in Plate 3 in Plate 4 in Plate
Min Flow Max Flow Min Flow Max Flow Min Flow Max Flow Min Flow Max Flow Min Flow Max Flow
(cfm) (cfm) (cfm) (cfm) (cfm) (cfm) (cfm) (cfm) (cfm) (cfm)
0.1 1 11 9 47 34 182 82 440 175 680
1 1 10 9 44 34 170 82 420 175 650
2 1 10 9 42 34 165 82 410 175 645
3 1 9 9 39 34 155 82 390 175 625
4 1 8 9 36 34 140 82 375 175 600
5 1 7 9 32 34 125 82 340 175 540
6 1 7 9 29 34 115 82 290 175 465
7 1 6 9 24 34 95 82 245 175 405
8 1 4 9 19 34 75 82 195 175 350
9 1 3 9 12 34 46 82 130 175 250


  1. Min Leakage is the recommended minimum flow rate based on a 0.4 in.wg. pressure drop across the orifice plate. For example, approximately 82 cfm through the 3-inch orifice plate results in a 0.4 in.wg. so 82 cfm is the recommended minimum leakage. Though it possible to use the orifice plates at pressure drops lower than 0.4 in.w.g, note that accuracy of the reading is decreased.
  2. Note that the data is based on laboratory tests with short lengths of hard pipe attached to the duct leakage tester. Actual field performance will likely result in reduced performance due to: (1) amount of flexible duct used; (2) number of bends in flexible duct; (3) size of duct system; (4) line voltage. To account for flexible duct and 90 degree bends, use our program that takes these in-line losses into account.

Capacity (Metric)

Use the table below to determine the range of air leakage you can test with the Cobra using our standard orifice plates.

Test Pressure
(Pa)		 Recommended Flow Range of Orifice Plate
Optional Low-Flow Plate 25mm Plate 50mm Plate 75mm Plate 100mm Plate
Min Flow Max Flow Min Flow Max Flow Min Flow Max Flow Min Flow Max Flow Min Flow Max Flow
(L/s) (L/s) (L/s) (L/s) (L/s) (L/s) (L/s) (L/s) (L/s) (L/s)
25 0.5 5.2 4.2 22 16 86 39 208 83 321
250 0.5 4.7 4.2 21 16 80 39 198 83 307
500 0.5 4.7 4.2 20 16 78 39 193 83 304
750 0.5 4.2 4.2 18 16 73 39 184 83 295
1000 0.5 3.8 4.2 17 16 66 39 177 83 283
1250 0.5 3.3 4.2 15 16 59 39 160 83 255
1500 0.5 3.3 4.2 14 16 54 39 137 83 219
1750 0.5 2.8 4.2 11 16 45 39 116 83 191
2000 0.5 1.9 4.2 9.0 16 35 39 92 83 165
2250 0.5 1.4 4.2 5.7 16 22 39 61 83 118
  1. Min Leakage is the recommended minimum flow rate based on a 100 Pa pressure drop across the orifice plate. For example, approximately 39 L/s through the 75 mm orifice plate results in a 100 Pa so 39 L/s is the recommended minimum leakage. Though it possible to use the orifice plates at pressure drops lower than 100 Pa, note that accuracy of the reading is decreased.
  2. Note that the data is based on laboratory tests with short lengths of hard pipe attached to the duct leakage tester. Actual field performance will likely result in reduced performance due to: (1) amount of flexible duct used; (2) number of bends in flexible duct; (3) size of duct system; (4) line voltage. To account for flexible duct and 90 degree bends, use our program that takes these in-line losses into account.

 

Options & Accessories

Options

  • Analog gauges

  • Inlet damper operation

  • Low-flow orifice plate (1 to 10 cfm)

  • 230v/1ph operation

Accessories

MENU