Level Electrodes - SPECTORcompact | Gestra | Philippopoulos s.a.
Level Electrodes - SPECTORcompact | Gestra | Philippopoulos s.a.
Level Electrodes - SPECTORcompact | Gestra | Philippopoulos s.a.
Level Electrodes - SPECTORcompact | Gestra | Philippopoulos s.a.
Level Electrodes - SPECTORcompact | Gestra | Philippopoulos s.a.
Level Electrodes - SPECTORcompact | Gestra | Philippopoulos s.a.
Level Electrodes - SPECTORcompact | Gestra | Philippopoulos s.a.
Level Electrodes - SPECTORcompact | Gestra | Philippopoulos s.a.

Level Electrodes - SPECTORcompact | Gestra

GESTRA SPECTORcompact – Level Electrodes with Integrated Evaluation

The SPECTORcompact series is applied in steam boilers, pressurized hot water systems, condensate tanks, and feedwater vessels. Unlike systems with separate electronic controllers, signal evaluation is integrated into the electrode head, reducing external modules in the control panel. Proper design of the protection tube or external level chamber remains essential for reliable operation.

Variants and Functionality

  • NRGS 11-1 / 16-1: Four-rod electrode with integrated level switching controller for MIN/MAX level detection and pump control.
  • NRGS 11-2 / 16-2: Compact controller/limiter with MIN alarm, pump ON/OFF, test, and reset functions.
  • NRGS 15-1: Compact PN25 system for low level 1/2, pump control, and high level alarm.
  • NRGT 26-1 / 26-2: Continuous level measurement using capacitive principle, analog output 4–20 mA.

Operating Conditions

Conductive compact systems require minimum water conductivity >0.5 μS/cm at 25°C. NRGS 16 is rated up to 32 bar at 238°C; NRGS 15-1 is PN25, 25 bar at 224°C. NRGT 26-2 is PN40, 32 bar at 238°C, with 24 VDC supply, IP65 enclosure, and 4–20 mA output.

Connections and Materials

Standard mechanical connections: G1 A ISO 228 for NRGS, G¾ A or DN50 PN40 flange for NRGT. Wetted parts are stainless steel (e.g., 1.4571), with PTFE electrode insulation.

Standards and Limitations

Compliant with VdTÜV Wasserstand 100, Low Voltage Directive, EMC, and selected UL/cUL certifications. Not suitable for ATEX-classified explosive atmospheres.

Selection Criteria

Selection is based on boiler pressure/temperature, water conductivity, required switching points, relay or 4–20 mA output, electrode length, and installation layout. External level chambers require periodic flushing of connecting lines to prevent blockages.

Description

Safer and more efficient steam production

Monitor your boiler water levels safely and accurately with GESTRA level controls.

These closed-loop controllers use capacitance probes, level transmitter features and a modulating control output for pneumatic valves. 

The level controller lets you know when the pre-set water level limit, minimum or maximum, has been reached and automatically opens or closes the control valve accordingly to protect your boiler.

Using the latest technology and manufactured to the highest quality standards you can be assured that our automatic electronic boiler equipment will help you to improve the performance of your boiler and meet all local regulatory standards.

Our solutions will help you to...

  • Improve boiler efficiency
  • Reduce boiler damage
  • Improve safety

What are the features?

  • Ideal for steam and hot water plants
  • Ideal for land and marine applications
  • Automatic shut-down
  • 100% measuring range

Safe and efficient monitoring of steam and hot water systems

For businesses safety, reliability, availability of steam and cost efficiency, along with effective simple plant automation and visualisation, are the top priority.

Market-leading SPECTORcompact level controls achieve this through the reliable application of innovative digital technology that enables existing self-acting systems to be replaced with ease so you can upgrade your boiler to the latest standards for safety, reliability and efficiency. 

All measured values are transferred as standard using 4 - 20 mA signals, making the transfer process easy. You can also incorporate existing controllers by means of integrated volt-free relay contacts without any need for additional electronic control units.

The integrated socket allows 'plug and play' installation. With only 25% of the water level in the gauge, a 100% complete calibration can be done which saves you time, energy and water.