FD-311

Calibration of FD-311

Summary:
A step-by-step tutorial on calibrating your FD-311 gas analyzer. 

Model: 
FD-311-He
FD-311-Ar
FD-311-N2O

Calibration Frequency: 
At least every 12 months.

Calibration Kit Items Required:

  1. Calibration Gas Bottle for:
  2. Calibration Gas Regulator (C10)
  3. Calibration T-piece & Tubing

▶️ Tutorial Calibration Video

 Example: FD-311-He

 

✅ STEP 1: ZERO Calibration to 0 ppm using Fresh Air.

  1. Power on your gas detector and allow 120 seconds for stabilization in fresh air.
  2. Expose the gas analyzer to fresh air for at least 1-2 minutes. 
  3. The gas detector may or may not read precisely 0 ppm. Depending on the model, it may or may not read 0.0 or 0.00 ppm. To zero calibrate and make it read exactly 0, 0.0, or 0.00 ppm, undertake the following steps.
  4. Press the middle button to go to the Menu Screen.
  5. Enter passcode: 1111.
  6. Select the "ZeroSet" icon by pressing the middle button.
  7. Then press the middle button to scroll down to highlight SAVE/EXIT option. 
  8. Then press the left button for "Save".
  9. Done! 
  10. Go back to the main display screen via the Exit icon. The unit will now read 0 ppm in fresh air.

✅ STEP 2: SPAN Calibration.

  1. Ensure you first undertake a Zero Calibration.
  2. Then, expose the gas analyzer to your calibration reference gas for 2 minutes or until the reading has stabilized. Use a flow rate of 0.5 LPM and connect the gas to the gas analyzer via the T-piece and tubing.
  3. Press the middle button to go to the Menu Screen.
  4. Enter passcode: 1111.
  5. Select the "Calibrat." icon.
  6. Press the middle button to highlight the 2nd row, which is called "Normal". Enter the span reference gas value for calibration, which is the same value shown on your gas bottle or, more precisely, on your calibration gas bottle Certificate of Analysis. 
  7. Go to the 3rd row called "Aerate".
  8. Then press "SAVE".
  9. The analyzer is now span-calibrated, and the calibrated value is shown on the main screen.
  10. Go back to the main display screen via the Exit icon.

✅ STEP 3: Verification.

  1. Allow the gas detector to stabilize in fresh air for 5 minutes, confirming it reads 0.0 ppm in fresh air.
  2. Expose the analyzer to the calibration reference gas to verify the calibration and detection repeatability.
  3. If the gas detector reading is within +/- 2% F.S. of the calibration gas value, this is considered a PASS. For example, FD-311-H3 has a full scale of 100%. The unit was calibrated to a reference gas of 100%. Then, a PASS range is +/-2% of 100% = +/- 2%. Therefore, a PASS is between 98% and 100%. 
  4. Once verified, your unit is properly calibrated and ready for operation.
  5. Don't forget to document the calibration event in your gas analyzer log book. Place a reminder calibration date sticker on the unit for the next calibration event.