Moisture sensors and microwave measuring systems for bulk materials – developed and manufactured in Mainz.

Franz Ludwig Gesellschaft für Mess- und Regeltechnik mbH

Mainz-Gonsenheim (headquarters, development, production) · Orlando, FL, USA (sales)New on Amplifa

1973Founded

2Sites (Mainz, Orlando)

Microwave / 433 MHzMeasuring principle

up to 130 °CMax. process temperature (high-temperature sensor)

± 0.3 %Measuring accuracy (depending on material)

High-tech sensor technology from Mainz

Franz Ludwig Gesellschaft für Mess- und Regeltechnik mbH has been developing and producing sensors and measuring systems for moisture and temperature measurement of bulk materials and materials in its manufactory in Mainz-Gonsenheim since 1973. The systems use microwave technology (433 MHz) and continuously record material moisture directly in the running process. The product portfolio includes the FL-WAPP sensor series with wireless data transmission, including variants with interchangeable head, for food applications (stainless steel 1.4404), for ATEX zones 20/22 and for process temperatures up to 130 °C, as well as temperature probes, measuring systems such as the FL-Mikro T2 water dosing computer, and portable measuring devices. Production uses stainless steel (V2A, 1.4404), die-cast aluminium and highly wear-resistant ceramic. In addition to production, the company offers project engineering, process integration, calibration, remote maintenance and worldwide support. Fields of application include the non-metallic minerals, construction materials, glass and ceramics, foundry, chemical, pharmaceutical, food and animal feed industries, as well as power plants.

Site: Mainz-Gonsenheim
Processes: Project engineering (product consulting, applications, installation, commissioning, process, Worldwide support and spare parts supply, Production/in-house manufacturing of moisture measuring systems, Project engineering (product consulting, applications, installation, commissioning), Worldwide support, Remote maintenance, Process integration/plant optimization, Calibration/parameterization
Materials: Stainless steel V2A, Stainless steel, Aluminium oxide ceramic, highly wear-resistant ceramic, Die-cast aluminium, Die-cast aluminium housing, Stainless steel 1.4404
Certificates: ATEX (zones 20/22, Directive 2014/34 EU), ATEX (Directive 2014/34 EU, Zones 20/22, IBExU), EC Regulation 1935/2004 / LFBG (food sensor)
Founded: 1973
Industries: Non-metallic minerals industry (concrete and precast industry), Construction materials industry, Foundries, Chemical industry, Pharmaceutical industry, Food industry

01
Development and design
02
Electronics manufacturing and production in the Mainz manufactory
03
Calibration and parameterization
04
Project engineering: product consulting, installation, commissioning, process
05
Remote maintenance, worldwide support and spare parts supply

Materials and processes

1.4301 (V2A)

Stainless steel V2A

Housing material of the FL-WAPP sensors and temperature probes with IP 68 protection rating for abrasive process environments.

1.4404

Stainless steel 1.4404

Housing material of the food sensor in accordance with EC Regulation 1935/2004 and the LFBG.

Al2O3

Aluminium oxide ceramic

Sensor measuring surface of the FL-WAPP Compact Sensor for pumpable media.

Ker

highly wear-resistant ceramic

Material of the sensor measuring surfaces and wear heads for abrasive operating conditions.

Al-DC

Die-cast aluminium

Housing material of the FL-WAPP Compact Sensor (evaluation module) and the ATEX sensor.

Sites

Mainz-Gonsenheim

Headquarters, development and production (manufactory)

Materials: Stainless steel (V2A, 1.4404), die-cast aluminium, ceramic

Orlando, Florida

Sales (W. Ludwig Manufacturing INC.)

Components and products

**FL-WAPP Sensor**Microwave moisture measuring sensor · bulk materials

**FL-WAPP Interchangeable-Head Sensor**Replaceable wear measuring head · non-metallic minerals industry

**FL-WAPP Flow (Compact Sensor)**Microwave sensor · pumpable media

**FL-WAPP ATEX Sensor**Explosion protection Zone 20/22 · chemical industry

**FL-WAPP High-Temperature Sensor**Up to 130 °C · power plants and foundries

**Basic Sensor**Moisture measuring sensor · universal use

**Temperature Probe**Stainless steel V2A · concrete and precast industry

**FL-Mikro T2**Water dosing computer · process integration

Inside the production

Industries

Non-metallic minerals industry (concrete and precast industry)Construction materials industryFoundriesChemical industryPharmaceutical industryFood industryAnimal feed industryGlass and ceramics industryPower plants

Processes & technical limits

Processes	Tolerance	Max. part	Weight	Lot size	Materials
Assembly	–	–	–	–	Stainless steel, Ceramic, Die-cast aluminium
Project engineering (product consulting, applications, installation, commissioning, processEngineering	–	–	–	–	–
Worldwide support and spare parts supplyEngineering	–	–	–	–	–

Additional services

Production/in-house manufacturing of moisture measuring systemsProject engineering (product consulting, applications, installation, commissioning)Worldwide supportRemote maintenanceProcess integration/plant optimizationCalibration/parameterization

Quality and certification

The sensors have protection ratings up to IP 68; the FL-WAPP ATEX sensor is certified in accordance with Directive 2014/34 EU by IBExU for zones 20 (measuring head) and 22 (attachment housings). The food sensor complies with EC Regulation No. 1935/2004 and the LFBG.

Evidence	Mainz-Gonsenheim
ATEX (Directive 2014/34 EU, Zones 20/22, IBExU)
EC Regulation 1935/2004 / LFBG (food sensor)

History

1973
Founding of Franz Ludwig Gesellschaft für Mess- und Regeltechnik mbH; over 50 years of experience in moisture measurement.