The document is a manual of operation and instruction for the Troxler Electronic Laboratories 4640-B Thin Layer Density Gauge. It describes the features and characteristics of the product.
This document serves as a Quick Reference Card for the Troxler Model 4640-B Thin-Layer Density Gauge. It provides brief instructions on selecting measurement layer thicknesses, managing offsets for out-of-range measurements, and storing test data under specific project numbers.
The guide also details the startup procedure, including daily standard count requirements using a magnesium reference block to compensate for source decay. Additionally, it outlines site preparation steps for asphalt surfaces and explains how to adjust count times and date/time settings.
| Measurement range | | to 4 inches (2.5 to 10.2 cm) |
|---|---|
| Average readings | Up to twelve |
| Product type | Thin-Layer Density Gauge |
Press (THICK), enter the desired layer thickness, and press (START/ENTER).
Place the gauge on an air gap spacer over a magnesium reference block, ensure the source rod is in the SAFE position, and press (STD).
The operator should wear a dosimeter or radiation badge when working with the 4640-B.