Calibration Span Reference for
HAZ-DUST IV and VDM-7500
Catalog No. 770-140
Operating Instructions
863 Valley View Road, Eighty Four, PA 15330 USA
The Calibration Span Reference light-sca 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 and VDM-7500 instruments. Calibration should be checked
the fi rst time the instrument is used, once each month with normal usage, and a er
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 ba 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. A ach the fi lter casse e
to the sensor head. A ach the air intake tubing to the fi lter casse 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 a er at least two minutes have elapsed to stop the pump.
5. Perform the auto-zero process as follows for the HAZ-DUST IV or the VDM-
7500:
a. Insert the zeroing fi lter into the thoracic sampling inlet.
b. Select Auto-Zero from Main Menu. The Auto-Zero screen will appear
briefl y.
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).
www.skcinc.com
Form #40084 Rev 1102
Figure 1. Insert Calibration Span Reference into sensor head.
8. Activate the internal sampling pump by repeating Step 4, a. through 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, rea 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 h p://www.skcinc.
com/warranty.asp.
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