• Connect the Calibration Gauge
  • Attach the gauge to the calibration connector.
  • tighten 2–3 turns to open the valve, then fully tighten.
  • Set gauge unit to MPa.
• Enter Calibration Mode
  • Go to Settings and click “Calibration Interface”.
• Hydraulic Calibration
  • Place a sample and press “DOWN”.
  • Click “PUSH”to apply pressure (0.05–0.2 MPa).
  • Enter gauge value in the box and confirm.
  • Click “Relief”to release pressure to 0.
  • Close the calibration valve and remove the gauge.
• Height Calibration
• With the specimen in place enter 0 in the height calibration box

• Air Pressure Calibration
  • Connect a compressed air tube to a tee connector. It’s one end is connected to the air gauge and another end to the machines air intake port
  • Enter gauge value and confirm to complete the calibration process.

Refueling:

• To access the refueling interface, select “Addition Glycerin” under System Settings.
• Detach the lower and upper fixtures
• Take out the test diaphragm and diaphragm gasket.
• To go to the refueling location, press the piston.
• Pour Glycerin along the oil filler’s inner wall.
• Shift the piston to the right. It will guide the oil directly into the cylinder.
• Three centimeters above the filler neck, fill glycerin.
• 10 to 30 short presses left and right on the piston will release air bubbles.
• Don’t empty the cylinder to keep outside air from getting in.
• To finish filling, keep pushing the piston to the right until no bubbles are visible.
• Reinstall the lower and upper fixtures
• To finish the procedure, the system will place the film automatically.

Common issues:

• No Pressure Build-Up:
  • Causes: Not enough hydraulic oil, blockage in the oil line, or worn out pump.
  • Corrective action: Check level, clean line and check the status of the pump.
• Unsteady or Sudden Pressure Drop:
  • Causes: Defective diaphragm or air in the system.
  • Corrective action:  Replace the Diaphragm and then vent the system.
• Drifting or Abnormal Pressure Reading:
  • Cause: Faulty (or out of adjustment) pressure sensor.
  • Corrective action: Recalibrate the pressure sensor.
• Sample Slipping:
  • Reason: Clamp is unfastened or seals are damaged.
  • Corrective action: Check and secure clamps, and replace seals as necessary.

• Put the calibration plate that came with AirFicient on the lower fixture. Make sure the notches of the calibration plate are aligned with the two red dots to the right and under the lower fixture. When you can see both the red dots of the bottom fitting and standard plate are in alignment, calibration is finished.

Figure: Calibration

• Before you calibrate the device, press the clamping buttons at the same time on both sides. Furthermore, the operation screen also permits you to enter the calibration mode. The real-time of the differential pressure and air flow is adjustable.
• A 20 cm²upper and lower fixture is used for the calibration, and mm/s is chosen as the unit of measurement. This instrument has been thoroughly calibrated by the manufacturer. So it is not suggested to adjust the control parameters to prevent abrupt changes.
• Tiptoe sensing must be calibrated. To calibrate tiptoe sensing,
• first put your foot out of the laser sensing sensor into the bottom 100mm of the machine.
• Holding it still, open the front left door at right side,
• and press the button pointed by the arrow.

The LED become yellow for 5 seconds in this stage. Then release the button and calibration is completed.

Figure: Tiptoe sensing Calibration

• Step-by-step Procedure:

1. After installing the necessary fixture (20 cm² as standard), calibrate the device.
2. Sensors indicate the ambient temperature, humidity, and atmospheric pressure of laboratory environment.
3. Select the differential pressure, flow rate, required standard and number of tests from the device interface.
4. The sample must be pre-treated in compliance with the established standards. Once processed, it must be placed in the specimen holder and clamped on both sides.
5. To begin the test, turn on the air permeability tester. The rate of airflow through the cloth at a given pressure differential will be measured by the air permeability tester.
6. Here in this device the air percolates through the cloth. As a result, a pressure gradient is established in the fabric. The velocity of air that flows through the fabric, under a given pressure is measured.
7. The velocity of air divided the test area gives the value of air permeability.
8. Tests can be done multiple times. Remove the specimen from the test head after the test is complete.
9. Result appears on the instrument display as well as on smartphones through SmarTexLab app.
10. High air permeability means higher breathability. It means more air can pass through the cloth.

Precaution:

• The grounding resistance of the instrument protection shell shall be ≤1Ω and it needs to be uniformly grounded
• The stainless steel filtering mesh needs to be cleaned monthly. It is placed below the lower fixture. For cleaning or blowing it out, high pressure gas is preferred. But when you’re done cleaning, if you went with the second cleaning option like water, you should dry the mesh before loading.
• A sealing rubber sheet is used as a material for determining airtightness of the equipment. When the rubber sheet ages you have to send for a new replacement to manufacturer.
• Do not restart the device right away if the power is turned off within a minute. Wait until the power is turned off.
• When the instrument system breaks down, have it fixed by qualified experts or have the manufacturer check it for maintenance. It is strictly forbidden for non-professionals to open the electrical box’s door.
• There must not be any significant electromagnetic interference around the device.
• We won’t be responsible for all the consequences of ignoring the guidelines and precautions in the handbook.

Calibration Process: Force and Displacement Speed both needs to be calibrated.

1. Calibration of the Force

Using Weight for Force Calibration:

• Make use of weights that adhere to international regulations.
• Verify that the accuracy level of the weight satisfies the test specifications.
• On the fixture of the tester, hang the weight.
• The mass of the weight multiplied by local gravity. For example, 10 kg × 9.8 m/s² = 98 N.
• Compare the standard force figure (such as 98 N) with the force that the tester is displaying.
• The difference indicates the accuracy of the tester.

Using a Tensile Transducer for Force Calibration:

• Make use of a common, accurately calibrated tensile transducer.
• Attach it in series between the specimen and chuck.
• Verify that the loading axis and force direction are in alignment.
• To get to the calibration point, run the machine at a constant speed.
• After force stabilization, compare the tester’s and the standard transducer’s reading.
• To finish the force calibration, use this comparison.

2. Calibration of Displacement Speed

• Establish Initial Position:
  • Note the fixture’s initial position beneath the machine.
  • This makes it easier to compare how much it moves during the test.
• Modify Speed Setting:

• Using the test results as a guide, set the necessary speed on the control panel.
• Measure the fixture’s movement with a regular straight steel ruler
• Verify that the chosen speed conforms to the actual movement.

• Timing and Measurement:
• As soon as you turn on the machine, start the electronic stopwatch.
• Give it a minute to run.
• After a minute, stop the machine and note how far the fixture has moved.
• This provides the displacement rate in millimeters per minute.
• To keep the error below ±1%, adjust the machine if necessary.

• Make Use of a Displacement Speed Measurement Device:

• Place the measurement device on the machine in the proper location.
• Follow the instrument’s user manual.
• Measure the speed and calibrate. It makes sure the machine’s displacement speed is accurate

Precautions

 Preparation prior to calibration:

• Make sure the testing apparatus is operating as intended.
• Verify that every component is there, intact, and not loosened or damaged.
• To prevent mistakes, clean the machine of any dust or debris.
• Assemble all the calibration equipment. It includes weights, tensile sensors, a stopwatch, a straight steel ruler.
• Also assemble displacement and speed measuring devices.

Environment for calibration:

• A stable laboratory environment setting is ideal for calibration.
• Steer clear of temperature and humidity variations that could compromise accuracy.
• Maintain the humidity between 45% and 75% and the temperature between 15°C and 35°C.

Calibration cycle:

• Establish an appropriate calibration plan according to the machine’s usage frequency.
• Consider the surrounding conditions, and the required level of accuracy in the results.
• Calibration should typically be carried out at least once a year.
• Calibrate the machine more frequently if it requires high accuracy or used frequently.

Calibration through Lissajous pattern

• Take the material off of the grinding table. Now put a round white paper on the table. The paper shall be flat, 100±5 mm in diameter and not less than 100 g/m² in weight.
• Install a steel sleeve in the guide of the same diameter as the sample pin. Put a ballpoint pen in so the tip touches the paper. A complete Lissajous pattern will appear after 16 friction cycle.
• Draw two parallel lines along the two outside curves of the pattern. Now draw two more lines on the two other sides, being sure that these lines intersect at right angles.
• Measure all four sides precisely (either edge within 0.2 mm). Look at the 31 different lines and the symmetry of the pattern.
• If the lines do not align or are not smooth, please contact us.

Figure: Lissajous Pattern