Viken Detection Pb200i - Testing Accuracy and Precision of the Pb200 i; Quality Control Procedures; Reference Block and Result Evaluation

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Testing the Accuracy and Precision of the Pb200i
The Pb200i should be tested for Quality Control (QC) before each inspection, every 4 hours, and when
the inspection is complete.
1. Start by placing the wooden reference block (Fig. 17) on top of the Pb200i case. Hold the device
with the proximity button against the wooden reference block, with the snout of the instrument
centered on the paint film nearest 1.0 mg/cm
2
. When the LED turns green (Fig. 18), squeeze and
hold the trigger, keeping the device’s snout in firm contact with the block while continuing to hold
the trigger (Fig. 19). The reading will automatically terminate (Fig. 20) when the device has
determined whether the sample is classified as Positive (when Pb≥1.0 mg/cm
2
), or Negative
(when Pb<1.0 mg/cm
2
).
2. Compare the result to the value on the reference block and make a note of the reading.
3. Complete the test 3 times, then average the readings. The average (rounded to 1 decimal place)
of the three readings must fall between 0.8 and 1.2 mg/cm
2
(inclusive) for the Pb200i to pass its
QC check in accordance with the Performance Characteristic Sheet (PCS).
Figure 18
Figure 19
Figure 20
1.04 mg/cm2
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Figure 17