SKC 770-140 Calibration Span Instruction Manual

Calibration Span Reference for HAZ-DUST IV
Cat. No. 770-140
Operating Instructions

770-140 Calibration Span

The Calibration Span Reference light-scatt ering device provides a constant value (known as a “K” factor). Use the Calibration Span Reference to check factory calibration of the HAZ-DUST IV instrument. Calibration should be checked the fi rst time the instrument is used, once each month with normal usage, and after an instrument has been dropped or damaged. Instruments should be sent to SKC annually for recalibration.

Calibration Procedure

1. Ensure sensor optics are clean and batt ery is fully charged (see instrument operating instructions). Calibration must be performed in a clean environment.

2. Activate the instrument LCD by pressing ON/OFF.

3. Insert the thoracic sampling inlet into the sensor head. Att ach the fi lter cassett e to the sensor head. Att ach the air intake tubing to the fi lter cassett e.

4. Activate the internal pump as follows:
   a. Select Run from Main Menu.
   b. Select Run – Continue.
   c. Select Yes and allow instrument to run for two minutes to stabilize.
   d. Press Enter after at least two minutes have elapsed to stop the pump.

5. Perform the auto-zero process as follows for the HAZ-DUST IV:
   a. Insert the zeroing fi lter into the thoracic sampling inlet.
   b. Select Auto-Zero from Main Menu. The Auto-Zero screen will appear briefly.
   c. Select Auto-Zero. The Auto-Zero screen will remain during the process. The Main Menu will display once the process is complete.

6. Remove the thoracic sampling inlet from the sensor head. Disconnect the air intake tubing.

7. Insert the Calibration Span Reference into the sensor head (Figure 1 on reverse side).

8. Activate the internal sampling pump by repeating Steps 4.a through 4.d. The internal sampling pump should remain running.

9. Observe the concentration value shown on the instrument LCD. Calculate the “K” value using the procedure below. The values should match within ± 10%.
   a. Agree within ± 10%, the instrument has passed the calibration check.
   b. Do not agree within ± 10%, repeat the above procedure to rule out error, then contact SKC technical support and return the instrument for recalibration.

10. Remove the Calibration Span Reference, reatt ach the air intake tubing, and replace the sampling inlet. Run unit for 2 minutes with zero fi lter and perform auto-zero.

Calculating the “K” Value

1. Follow Steps 1 through 6 for calibrating the instrument (see reverse side).
2. Repeat Steps 7 through 9 three times and average the results displayed on the LCD. That average value is the “K” value. Record the “K” value on the Calibration Span Reference and use it for subsequent calibrations. Write the serial number of the instrument on the Calibration Span Reference.

SKC Limited Warranty and Return Policy

SKC products are subject to the SKC Limited Warranty and Return Policy, which provides SKC’s sole liability and the buyer’s exclusive remedy. To view the complete SKC Limited Warranty and Return Policy, go to http://www.skcinc.com/warranty.

863 Valley View Road, Eighty Four, PA 15330 USA
Tel: 724-941-9701
www.skcinc.com
Form 40084 Rev 1810

References

• SKC, Inc. | Industrial Hygiene and Occupational Safety Products and Technology
• SKC, Inc. | Industrial Hygiene and Occupational Safety Products and Technology

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