GESTRA NRG 16-50, NRG 17-50, NRG 19-50, NRG 111-50

Water Level Limiter Level Electrode

GESTRA NRG 16-50, NRG 17-50, NRG 19-50, NRG 111-50 Water Level Limiter Level Electrode
GESTRA NRG 16-50, NRG 17-50, NRG 19-50, NRG 111-50 Water Level Limiter Level Electrode
GESTRA NRG 16-50, NRG 17-50, NRG 19-50, NRG 111-50 Water Level Limiter Level Electrode

GESTRA NRG 16-50, NRG 17-50, NRG 19-50, NRG 111-50 Water Level Limiter Level Electrode

The level electrodes NRG 1…-50 are used in conjunction with level switch NRS 1-50 as water level limiters for steam boiler plants and (pressurised) hot water installations.

Water level limiters switch off the heating when the water level falls below the set minimum level (low water).

When the water level falls below the low level, the level electrode is exposed and a low level alarm is triggered in the level switch NRS 1-50. This switchpoint “Low water level (LW)” is determined by the length of the electrode tip. The electrode operation is based on the conductive measuring principle using the electrical conductivity of the water for signalling water level.

The self-monitoring function ensures that an alarm will also be triggered if the electrode insulation is contaminated or has developed a leak and/or if there is a malfunction in the electrical connection.

The level electrode is installed inside steam boilers, vessels or inlet lines of hot-water systems. The protection tube provided on site ensures the function.

One level electrode NRS 1…-50 can be installed together with one GESTRA level electrode, one level switch or transmitter for water level control and low level alarm in one single protection tube or level pot.

If the level electrode is installed in a level pot outside the boiler, make sure that the connecting lines are rinsed regularly. In addition, the logic unit SRL is required to monitor the purging times and the purging sequence.

If the connecting lines for steam ≥ 40 mm and water ≥ 100 mm the installation is considered as “inside”. In this case the purging process does not have to be monitored.

Service pressure

NRG 16-50, PN 40, 32 bar at 238 °C

NRG 17-50, PN 63, 60 bar at 275 °C

NRG 19-50, PN 160, 100 bar at 311 °C

NRG 111-50, PN 320, 183 bar at 357 °C

Mechanial connection

Screwed G ¾ A, ISO 228-1 (NRG 16-50, NRG 17-50, NRG 19-50)

Screwed G 1 A, ISO 228-1 (NRG 111-50)

Materials

Sheath: 1.4301 X5 CrNi18-10

Screw-in body: 1.4571 X6 CrNiMoTi 17 -12 -2

(NRG 16-50, NRG 17-50, NRG 19-50)

Screw-in body: 1.4529,

X1NiCrMoCuN25-20-7 (NRG 111-50)

Measuring electrode: 1.4571 X6 CrNiMoTi 17-12 -2

(NRG 16-50, NRG 17-50, NRG 19-50)

Measuring electrode: 1.4122,

X39CrMo17-1 (NRG 111-50)

Electrode tip: 1.4401 X5 CrNiMo 17-12-2

Electrode insulation: Gylon® (NRG 16-50, NRG 17-50, NRG 19-50)

Electrode insulation: special ceramic (NRG 111-50) NRG 1…-50: Four-pole connector: polyamid (PA) NRG 1…-50F: Terminal box 3.2161 G AlSi8Cu3

Lengths supplied

500 mm, 1000 mm, 1500 mm, 2000 mm, 2500 mm,

3000 mm

ph value

Max. admissible: 10 (NRG 111-50)

Electrical connection

NRG 1…-50: Four-pole connector, cable gland M16 NRG 1…-50F: Aluminium terminal box, cable gland M20

Protection

IP 65 to EN 60529

Max. admissible ambient temperature

70 °C

Weight

Approx. 1.2 kg (without extension) (NRG 16-50, NRG 17-50, NRG 19-50)

Approx. 1.8 kg (without extension) (NRG 111-50)

GESTRA NRG 16-50, NRG 17-50, NRG 19-50, NRG 111-50

Water Level Limiter Level Electrode

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

High-Precision Water Level Limiter & Level Electrode for Boiler Safety Systems

When it comes to boiler safety, reliability, and operational efficiency, choosing the right Water Level Limiter and Level Electrode is critical. GESTRA NRG series — including NRG 16-50, NRG 17-50, NRG 19-50, and NRG 111-50 — are globally recognized solutions designed to deliver maximum protection against low water conditions in industrial steam and hot water boiler systems.

These products are engineered in Germany and trusted worldwide in power plants, manufacturing facilities, food & beverage industries, oil & gas, chemical plants, and commercial boiler applications.

GESTRA is a global leader in boiler automation and safety technology, known for uncompromising quality and compliance with international safety standards.

Key Advantages of GESTRA NRG Series:

  • ✅ Highly accurate water level detection

  • ✅ Fail-safe design for boiler protection

  • ✅ Long service life in extreme conditions

  • ✅ Compatible with GESTRA level controllers

  • ✅ Certified according to international boiler safety regulations

  • ✅ Low maintenance and easy installation

The GESTRA NRG 16-50 is a robust conductivity-based level electrode designed for use as a Water Level Limiter in steam and hot water boilers.

Features:

  • Stainless steel electrode for high durability

  • Precise detection of minimum water level

  • Resistant to high pressure and temperature

  • Ideal for standard industrial boiler applications

GESTRA NRG 16-50 ensures stable boiler operation while significantly reducing the risk of overheating and boiler damage caused by low water levels.

The GESTRA NRG 17-50 Water Level Limiter offers enhanced performance for applications requiring higher safety margins and accuracy.

Benefits:

  • Optimized for higher pressure systems

  • Fast response to water level changes

  • Excellent resistance to steam and condensate

  • Designed for continuous industrial operation

This model is widely used in process industries and high-load boiler systems where safety cannot be compromised.

For boilers operating under extreme pressure and temperature, the GESTRA NRG 19-50 is the preferred choice.

Key Highlights:

  • Designed for high-pressure steam boilers

  • Superior conductivity measurement accuracy

  • Robust mechanical construction

  • Long operational lifespan

The NRG 19-50 provides dependable boiler protection even in the most demanding environments.

The GESTRA NRG 111-50 represents advanced technology in Water Level Limiter and Level Electrode systems.

Advantages:

  • Highly sensitive level detection

  • Suitable for modern automated boiler systems

  • Seamless integration with GESTRA controllers

  • Complies with international safety standards

This model is ideal for critical boiler safety applications requiring precise monitoring and rapid shutdown capability.

GESTRA Water Level Limiters and Level Electrodes are widely used in:

  • Industrial steam boilers

  • Hot water boilers

  • Power generation plants

  • Food & beverage processing

  • Chemical and petrochemical plants

  • Pharmaceutical manufacturing

  • Commercial boiler installations

A Water Level Limiter is a mandatory safety device that prevents boiler dry running, which can cause:

  • Severe equipment damage

  • Unplanned downtime

  • Safety hazards and accidents

  • Costly repairs and regulatory violations

Using a certified GESTRA Level Electrode ensures compliance, safety, and long-term operational efficiency.

Choosing original GESTRA NRG 16-50, NRG 17-50, NRG 19-50, or NRG 111-50 guarantees:

  • Authentic German engineering

  • Full product traceability

  • Maximum reliability and performance

  • Manufacturer-approved quality standards

If you are looking for a high-quality Water Level Limiter and Level Electrode, the GESTRA NRG series is the industry’s trusted solution.

🔹 Improve boiler safety
🔹 Reduce operational risks
🔹 Increase system reliability

Contact us today for the best price, technical support, and fast delivery of GESTRA NRG 16-50, NRG 17-50, NRG 19-50, and NRG 111-50.

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