GESTRA LRGT 16-3, LRGT 16-4, LRGT 17-3

Conductivity Transmitter

GESTRA LRGT 16-3, LRGT 16-4, LRGT 17-3, Conductivity Transmitter
GESTRA LRGT 16-3, LRGT 16-4, LRGT 17-3, Conductivity Transmitter
GESTRA LRGT 16-3, LRGT 16-4, LRGT 17-3, Conductivity Transmitter

GESTRA LRGT 16-3, LRGT 16-4, LRGT 17-3 Conductivity Transmitter

LRGT 16-3, LRGT 16-4 and LRGT 17-3 conductivity trans- mitters can be used as conductivity limiters and blowdown controllers to continually measure conductivity in steam boiler and hot-water plants. They present a linear profile of conductivity in the parametrized measuring range via a 4 – 20 mA current output.

In combination with secure diagnostic testers, LRGT 16-3, LRGT 16-4 and LRGT 17-3 conductivity transmitters are suitable for safety functions up to SIL 2.

Transmitter function

The transmitter function is the ability of the electrode to provide a scalable measuring range on the 4-20 mA current output interface, and to make this available to one or more recipients for analysis.

This equipment does not have any controlling or limiting functions.

Measuring process of the LRGT 16-3 and LRGT 17-3

LRGT 16-3 and LRGT 17-3 conductivity transmitters use the conductometric two-electrode measuring process. A measur- ing current with a suitable frequency for the measuring range is introduced into the fluid. This produces a potential gradient between the electrode and the measuring tube, which is analysed as a measuring voltage.

Measuring process of the LRGT 16-4

The LRGT 16-4 conductivity transmitter uses the conducto- metric four-electrode measuring process. It consists of two current and two voltage electrodes. The current electrodes introduce a measuring current with a fixed frequency into the fluid. This gives rise to a potential gradient between these electrodes. This potential gradient is then picked up by the voltage electrodes and analysed as measuring voltage.

Temperature compensation of readings based on a reference temperature (25 °C)

The electrical conductivity changes as a function of the temperature. In order to base the readings on a reference temperature, an integrated resistance thermometer measures the temperature of the fluid. The electrical conductivity is calculated from the measuring current and measuring volt- age, and then based on the reference temperature of 25 °C through temperature compensation.

Compensation process

Based on a set temperature coefficient, the conductivity read- ing is corrected to form a linear characteristic. The coefficient (default 2.1 % per °C) is normally used for steam generating units with a constant pressure.

Automatic self-test

An automatic self-test periodically monitors the safety and function of the conductivity transmitters and measured value acquisition. Faults in the electrical connection or electronic measuring equipment trigger a fault indication on the display, and the current output is set to 0 mA.

Behaviour in the event of faults

The error state or malfunction is shown on the display by an error code, e.g. E.005.

Every time there is a fault, 0 mA is output via the current output.

Model and mechanical connection

 

  • LRGT 16-3, LRGT 16-4, LRGT 17-3:

Thread G1 A, EN ISO 228-1

Nominal pressure rating, admissible service pressure and temperature

 

  • LRGT 16-3: PN 40 32 bar (abs) at 238°C
  • LRGT 16-4: PN 40 32 bar (abs) at 238°C
  • LRGT 17-3: PN 63 60 bar (abs) at 275°C

Materials

 

  • Terminal box: 2581 G AlSi12, powder-coated
  • Sheath: 4301 X5 CrNi 18-10
  • Measuring electrodes: 4571 X6CrNiMoTi17-12-2
  • Electrode insulation: PTFE
  • Screw-in body:
    • Measuring tube/screw of LRGT 16-3 and LRGT 17-3: 4571, X6CrNiMoTi17-12-2
    • Spacer disc of LRGT 16-3, LRGT 16-4 and LRGT 17-3: PEEK

Available electrode lengths (do not shorten)

 

  • LRGT 16-3, LRGT 17-3:

200, 300, 400, 500, 600, 800,1000 (mm)

  • LRGT 16-4:

180, 300, 380, 500, 600, 800,1000 (mm)

Temperature sensor

 

  • Resistance thermometer: Pt1000
  • Measuring range for fluid temperature: 0 to 280 °C

Conductivity range at 25 °C

 

  • LRGT 16-3, LRGT 17-3:

0.5 μS/cm to 6000 μS/cm, 0.25 – 3000 ppm *

  • Preferred measuring range up to 1000 µS/cm
  • LRGT 16-4:

50 μS/cm to 10,000 μS/cm, 25 – 5000 ppm *

  • Preferred measuring range from 500 µS/cm
  • Conversion µS/cm in ppm (parts per million): 1 μS/cm = 0.5 ppm

Measuring cycle

 

  • 1 second

Temperature compensation

 

  • The temperature compensation process is linear and set via parameter

Supply voltage

 

  • 24 V DC ± 20%

Power consumption

 

  • 7 W

Current input

 

Max. 0.35 A

GESTRA LRGT 16-3, LRGT 16-4, LRGT 17-3

Conductivity Transmitter

GESTRA: The Ultimate Solution for Industrial Steam & Fluid Control Systems

Ultimate Precision for Steam & Industrial Process Monitoring

If your operation depends on accurate conductivity measurement, rapid response, and long-term reliability, the GESTRA LRGT 16-3, LRGT 16-4, and LRGT 17-3 Conductivity Transmitters deliver unmatched value. Engineered for high-demand steam systems, boiler automation, and industrial process control, these advanced transmitters offer the perfect combination of safety, efficiency, and cutting-edge German technology.

GESTRA is globally recognized for manufacturing precision instruments used across power plants, refineries, manufacturing facilities, chemical industries, and high-performance steam systems. The LRGT series stands out for its exceptional durability, fast signal processing, and ability to maintain incredibly stable conductivity measurements even under extreme conditions.

Whether you’re upgrading your boiler automation system or optimizing industrial process control, these transmitters ensure accurate water quality monitoring, helping you reduce downtime, increase energy efficiency, and maintain full compliance with safety standards.

The LRGT 16-3 is ideal for demanding steam and condensate systems where precise continuous conductivity measurement is vital. With robust engineering and reliable data output, this model helps operators maintain consistent water quality while preventing scale formation and corrosion.

Key Highlights

  • Designed for high-pressure steam applications

  • Delivers stable and accurate conductivity readings

  • Fast response time for real-time monitoring

  • Easy integration into modern control systems

The LRGT 16-3 is a trustworthy solution for facilities focusing on efficiency, safety, and long-term reliability.

The LRGT 16-4 builds on the performance of the 16-3 while offering enhanced sensitivity and extended features for more complex industrial applications.

Top Advantages

  • Exceptional accuracy across wide conductivity ranges

  • Enhanced signal stability for critical process applications

  • Rugged construction suitable for harsh environments

  • Ideal for automated blowdown and water treatment systems

This model is perfect for users requiring high precision and maximum operational control.

As one of GESTRA’s most advanced conductivity transmitters, the LRGT 17-3 incorporates modern sensor technology and optimized measurement algorithms, delivering superior performance even in highly fluctuating process conditions.

Main Features

  • Advanced measurement technology for exceptional accuracy

  • Highly reliable conductivity monitoring suitable for modern boiler plants

  • Easy installation and minimal maintenance

  • Designed to maximize safety and improve system performance

For businesses that prioritize premium performance and long-term operational stability, the LRGT 17-3 is a top-tier choice.

The GESTRA LRGT series is widely used in:

  • Power generation & boiler systems

  • Oil & gas processing

  • Chemical & petrochemical industries

  • Food & beverage manufacturing

  • Pharmaceutical and biotech facilities

  • Water treatment and steam distribution networks

These transmitters ensure safe, efficient, and fully optimized system operation across diverse industrial environments.

  • Improved steam and water quality

  • Reduced scaling, corrosion, and system damage

  • Enhanced energy efficiency and operational cost savings

  • Automated process control for reliable system management

  • Longer system lifespan with lower maintenance requirements

Choosing GESTRA means investing in proven reliability and world-class engineering.

We provide original GESTRA products, competitive pricing, the latest model availability, and expert technical support to help you choose the perfect conductivity transmitter for your system.

👉 Request a quote now to secure the best deal and improve your operational efficiency with industry-leading GESTRA technology.

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