Thickness Measurement of Drywall

The Application
Wet gypsum is run through a press roll and onto a conveyor belt. The press roll regulates the thickness of the drywall. However, measurements of the material on the conveyor belt are made to ensure the quality of the manufactured board.

The Problem
The tolerance of the drywall is plus or minus 1 mm. In most facilities, the production line is stopped occasionally and manual measurements of the board are made. The manual measurement is time-consuming and shutting down the line reduces output.

The Solution
Drexelbrook installed an RF continuous transmitter using a sensing element with a 14-inch x 14-inch plate. This plate allows the transmitter to make a non-contact proximity measurement. The thickness of the drywall is continuously monitored and no longer requires stopping the conveyor.

Benefits
· Continuous monitoring of the drywall thickness ensures quality and increases production.
· HART smart RF transmitter for easy calibration from anywhere in the loop.
· No routine maintenance required. Install it and forget it.

Related products

Magnetrol

Displacer switches – single, dual and tri-switch series

Single-Stage Switches

Series A10 displacer type level measurement units are wide differential units calibrated to actuate as a liquid level reaches a given displacer and to deactuate when the level reaches a second displacer. Single stage, wide differential displacer switches are factory calibrated yet field-adjustable to operate over a wide level differential band.

The minimum differential band is approximately 6 inches (152 mm) in water and varies somewhat with liquid specific gravity. The maximum differential is determined by the length of the displacer suspension cable. Series A15 units are calibrated to operate over a narrow level differential band and are ideally suited for liquid level alarm applications on either high or low level.

Dual-Stage Switches

Series B10 displacer type level measurement units are wide differential tandem switches that are factory calibrated with a choice of several switch operating sequences designed to meet virtually any application.

Series B15 units are narrow differential tandem switches that are factory calibrated. Each switch actuates at a different level.

Tri-Stage Switches

Series C10 displacer type level measurement units utilize three electrically separate control signals in a selected sequence in response to liquid level changes.

Series C15 units are wide differential switches with a choice of several operating sequences combining wide and narrow level differential and are factory calibrated.

Magnetrol

E4 Modulevel® liquid level transmitter

The E4 Modulevel® is a loop powered, two-wire instrument, utilizing simple buoyancy principles to detect and convert liquid level changes into a stable output signal. The linkage between the level sensing element and output electronics provides a purely mechanical design and construction. The vertical in-line design of the transmitter results in low instrument weight and simplified installation. The instrument comes in a variety of configurations and pressure ratings for varied applications.

The E4 Modulevel has microprocessor based electronics with 4–20 mA/HART® digital output. E4 supports the FDT/DTM standard and a PACTware™ PC software package allows for additional configuration, diagnostics and trending capabilities.

Other applications

Do you want personal advice for your specific control process?

Contact your local AMETEK Level Measurement Solutions representative!

Find my local representative