EM4214 Electromagnetic Ultrasonic Thickness Measurement Module

1 Device Description and Intended Use

　　The EM4214 OEM EMA module (hereinafter referred to as the "module") is designed for measuring the thickness of metal objects in non-destructive testing systems, with measurement data transmitted over a network. This module can accurately determine the remaining thickness of metal products, such as pipe walls, flat steel, and bars.

　　This module consists of a set of circuit boards (Figure 1) and an electromagnetic-acoustic (hereafter referred to as EMA) measurement sensor, the EMT14012.

　　1- Ethernet interface activity indicator light.
　　2- Power and Ethernet connector (1 pin).
　　The 3-LED speed is 100 Mbps.
　　4-USB connector.
　　5- Synchronous input.
　　6- Synchronous output.

Figure 1: Module (Top View)

　　Table 1.1 lists the circuit names and pin numbers for the power supply and Ethernet connectors.

Table 1.1

　　To start the module, you must provide the signal from the synchronization output to its synchronization input. If multiple modules are present, you must select one of them and use only the signal from its synchronization output—other modules' synchronization outputs should not be utilized.

　　The module exchange protocol is detailed in Appendix A.

　　This module can operate with all EMA sensors developed by Precision Inspection, including sensors with gaps up to 6 mm, high-temperature EMA sensors, and sensors equipped with pulsed electromagnets.

2 How It Works

　　This module measures the time it takes for sound waves to travel through the test object, then converts this measured time into thickness using a predefined ultrasonic wave propagation speed.

　　Sound waves are generated directly on the surface of the test object using electromagnetic-acoustic conversion technology, eliminating the need for a coupling medium between the transducer and the test object. As a result, the contact medium between the transducer and the test object’s surface does not introduce any distortion to the sound waves. The working gap—whether filled with air, liquid, rust, paint, plastic, or other materials—typically measures 2 to 3 millimeters.

3 Technical Specifications

　　*H - Measured thickness value, mm.

　　**The EMT14014T sensor is not suitable for long-term use at 750°C. The maximum temperature for continuous operation of this sensor is 300°C. For objects with temperatures ranging between 300°C and 750°C, measurements should be taken only for short durations, with a 15-second interval between each reading.

4 Scope of Supply

Basic configuration:

　　Not included in the standard configuration but available for separate order:

　　- The EMA sensor EMT14013 can be used with devices featuring gaps up to 6 mm.

　　- EMT15015RPEMA sensor (with pulse solenoid) and connecting cable;

　　- The high-temperature EMA sensor EMT14014T is designed for use with objects whose surfaces are heated up to 750°C.

　　This module does not include any power components or batteries.

5 Transportation and Storage

　　The following climate conditions should be maintained during the storage and transportation of the module:

　　- Air temperature: +5 to +30°C.

　　- Humidity: 80% at +25°C.

　　Avoid mechanical damage.

　　Transport using boxes or other containers.