GESTRA NRG 16-61 NRG 17-61 NRG 19-61 NRG 111-61

Level Electrodes

GESTRA NRG 16-61 NRG 17-61 NRG 19-61 NRG 111-61 Level Electrodes
GESTRA NRG 16-61 NRG 17-61 NRG 19-61 NRG 111-61 Level Electrodes
GESTRA NRG 16-61 NRG 17-61 NRG 19-61 NRG 111-61 Level Electrodes

GESTRA NRG 16-61 NRG 17-61 NRG 19-61 NRG 111-61 Level Electrodes

In combination with the URS 60 / URS 61 safety control unit, NRG 1x-61 level electrodes are suitable for safety functions up to SIL 3.

They are elements of a safety circuit up to a rating of SIL 3 as per EN 61508 in the SPECTORconnect system, and can transmit alarm notifications.

The level electrode uses the principle of conductive meas- urement and monitors itself. This means that a fault in the electrical connection or electronic measuring equipment triggers an alarm.

Alarms and error messages are displayed by LEDs or an operating unit. They are also saved in the level electrode and transferred to the URS 60 / URS 61 safety control unit using the CANopen protocol.

The NRG 1x-61 can indicate the maximum fill level in electri- cally conductive fluid:

  • A level with a switchpoint.
  • A safety high-level limiter prevents the defined maxi- mum high water (HW) level from being exceeded, e.g. by switching off the feedwater supply.

Visualisation and operation take place via the URB 60 or SPECTORcontrol.

Conductive level measurement based on the conductivity measurement principle. Some liquid substances are conduc- tive, i.e. electric current can flow through them. To ensure this method functions reliably, the substance being measured must have a certain minimum conductivity.

The conductive measuring process delivers two find- ings:

  • Electrode rod immersed or electrode rod not immersed, or in other words switchpoint reached or not reached.

Before installation, the length of the electrode rod must be adapted to match the point at which switching must take place, e.g. “pump OFF” or “control valve CLOSED” or – if there is a risk to downstream heating surfaces in the steam generating unit – “firing, burner OFF”.

Behaviour in the event of an alarm

  • If the water rises above the maximum level, the level electrode is immersed and the URS 60 / URS 61 safety control unit triggers an
  • If an additional electrode is installed, the insulated section between the measuring electrode and earth is automatically monitored. If the value is below the admissible resistance value, the safety circuit is inter- rupted and burner switch-off is initiated.

Automatic self-test

An automatic self-test periodically monitors the safety and function of the level electrode and measured value acquisition.

The data are transferred to the URS 60 / URS 61 safety control unit in the form of a Black Channel data telegram via the CANopen protocol using a CAN bus to ISO 11898, and saved there.

Model and mechanical connection

  • NRG 16-61 NRG 17-61 Thread G¾ A, EN ISO 228-1
  • NRG 19-61 Thread G¾ A, EN ISO 228-1
  • NRG 111-61 Thread G1 A, EN ISO 228-1

 

Nominal pressure rating, admissible service pres- sure and temperature

  • NRG 16-61 PN 40 32 bar (g) at 238 °C
  • NRG 17-61 PN 63 46 bar (g) at 260 °C
  • NRG 19-61 PN 160 100 bar (g) at 311 °C
  • NRG 111-61 PN 320 183 bar (g) at 357 °C

 

Materials

  • Terminal box 2581 G AlSi12, powder-coated
  • Sheath 4301 X5 CrNi 18-10
  • Electrode extension 4401 X5 CrNiMo 17-12-2
  • Electrode insulation
    • NRG 16-61, NRG 17-61 PEEK
    • NRG 19-61 PEEK and PTFE
    • NRG 111-61 Special ceramic

 

¦ Screw-in body:

  • NRG 16-61, NRG 17-61, NRG 19-61

1.4571, X6CrNiMoTi17-12-2

  • NRG 111-61

1.4529, X1NiCrMoCuN25-20-7
 

pH value

  • NRG 111-61 Maximum admissible = 10

 

Electrode lengths supplied

  • 500 mm, 1000 mm, 1500 mm
  • The electrode extension can be shortened

 

Conductivity range at 25 °C

  • NRG 16-61, NRG 17-61, NRG 19-61

0.5 µS/cm to 10,000 µS/cm

  • NRG 111-61
    • µS/cm to 100 µS/cm, with measuring surface extension

 

Sensitivity

  • 1 µS/cm at an immersion depth of 5 mm, with measuring surface extension

 

Supply voltage

  • 24 V DC +/-20 %

 

Power consumption

  • 7 VA

 

Current input

  • 0.3 A

 

Internal fuse

  • T2A

GESTRA NRG 16-61 NRG 17-61 NRG 19-61 NRG 111-61

Level Electrodes

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

GESTRA NRG Level Electrodes are globally recognized high-performance water level sensors designed for steam boilers, condensate tanks, and industrial level control systems.
Models NRG 16-61, NRG 17-61, NRG 19-61, and NRG 111-61 deliver exceptional accuracy, durability, and operational safety, making them the preferred choice for power plants, oil & gas facilities, chemical industries, and manufacturing plants worldwide.

When safety, efficiency, and reliability are non-negotiable, GESTRA NRG electrodes set the industry benchmark.

✅ German Engineering & Proven Reliability

GESTRA is a world-leading brand in steam and condensate control technology, trusted for decades across critical industries.

✅ Precise Water Level Detection

Each GESTRA NRG electrode ensures accurate and stable level measurement, minimizing risks of dry running, overflow, or system failure.

✅ Long Service Life

Manufactured from high-quality stainless steel and premium insulation materials, ensuring resistance to corrosion, pressure, and extreme temperatures.

✅ International Standards Compliance

Fully compliant with industrial safety regulations, making them suitable for demanding boiler and steam applications.

The NRG 16-61 is ideal for level monitoring and control in steam boilers. It provides stable performance even under fluctuating operating conditions.

Key Features:

  • Reliable electrode-based level detection

  • Suitable for high-pressure boiler systems

  • Maintenance-friendly design

The NRG 17-61 level electrode is designed for advanced level control applications, offering enhanced sensitivity and operational safety.

Applications:

  • Industrial steam boilers

  • Condensate tanks

  • Feedwater systems

The NRG 19-61 is widely used in multi-electrode level measurement systems, providing precise signaling for alarms and control units.

Advantages:

  • High signal accuracy

  • Strong resistance to electrical interference

  • Compatible with GESTRA level controllers

The NRG 111-61 is a premium solution for high-demand industrial environments, offering superior durability and precision.

Benefits:

  • Designed for extreme temperature and pressure

  • Exceptional measurement stability

  • Ideal for critical safety systems

  • Steam boilers

  • Power generation plants

  • Oil & gas processing facilities

  • Chemical and petrochemical industries

  • Food & beverage processing

  • Pharmaceutical manufacturing

  • High measurement accuracy

  • Low maintenance requirements

  • Easy installation and replacement

  • Long operational lifespan

  • Seamless integration with GESTRA control systems

Purchasing original GESTRA NRG 16-61, NRG 17-61, NRG 19-61, and NRG 111-61 ensures:

✔ Maximum operational safety
✔ Manufacturer-backed quality
✔ Consistent system performance
✔ Reduced downtime and maintenance costs

Avoid counterfeit products that may compromise system safety and efficiency.

What is a GESTRA NRG Level Electrode?

A GESTRA NRG level electrode is a conductivity-based sensor used to detect and control water levels in steam and boiler systems.

Are GESTRA NRG 16-61 and 17-61 interchangeable?

They serve similar purposes but differ in technical specifications and application requirements. Always verify system compatibility.

Can GESTRA NRG electrodes operate in high-pressure boilers?

Yes. All listed models are designed for industrial-grade pressure and temperature conditions.

How long is the service life of GESTRA NRG electrodes?

With proper installation and maintenance, GESTRA NRG electrodes offer long-term, stable performance over many years.

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NRG 16-60 NRG 17-60 NRG 19-60 NRG 111-60GESTRA NRG 16-60 NRG 17-60 NRG 19-60 NRG 111-60 Level ElectrodesGESTRA URS 60, URS 61 Safety Control UnitsURS 60, URS 61