SKC Limited Haz-Dust IV - Manual (Page 64)

Checking the Calibration Span,
Continued
6 Perform the Auto-Zero process using the steps in the table below.
Step Action
6-1 Insert the zeroing filter into the Thoracic sampling inlet.
6-2 Select Special Functions from the Main Menu.
6-3 Select System Options.
6-4 Select Extended Options.
6-5 Select Auto-Zero.
Result: The Auto-Zeroing screen appears briefly.
6-6 Select Auto-Zero.
Results:
• The Auto-Zeroing screen appears during the auto-
zero process.
• The Main Menu is displayed when the Auto-Zero
process is complete.
7 Remove the Thoracic sampling inlet from the sensor head.
8 Disconnect the air intake tubing.
9 Insert the calibration reference into the sensor head (see diagram
5-1 on page 5-2).
Note: Be sure the locating pin on the calibration reference slides
into the locating hole on the sensor head.
10 Activate the internal sampling pump again by repeating the
process described in step number five on page 5-3. Skip step
number 5-7 and leave the sampling pump running.
11 Observe the printed “k” value on the calibration reference.
Note: The printed “k” value should match the concentration value
shown on the Haz-Dust IV LCD to within + 10%.
Note: If the CS-103 is purchased as an after market accessory or
from SKC, Inc., then the user must assign a “k” value.
IF THEN
The numbers agree
within + 10%
The Haz-Dust IV has passed the span
check test.
The two numbers
do not agree within
+ 10%.
1. Repeat the process to rule out error,
then
2. Call EDC technical support or
return the Haz-Dust IV for
recalibration.
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