Level Controllers - SPECTORmodul | Gestra | Philippopoulos s.a.
Level Controllers - SPECTORmodul | Gestra | Philippopoulos s.a.
Level Controllers - SPECTORmodul | Gestra | Philippopoulos s.a.
Level Controllers - SPECTORmodul | Gestra | Philippopoulos s.a.
Level Controllers - SPECTORmodul | Gestra | Philippopoulos s.a.
Level Controllers - SPECTORmodul | Gestra | Philippopoulos s.a.
Level Controllers - SPECTORmodul | Gestra | Philippopoulos s.a.
Level Controllers - SPECTORmodul | Gestra | Philippopoulos s.a.

Level Controllers - SPECTORmodul | Gestra

GESTRA SPECTORmodul – Boiler Level Controllers

The GESTRA SPECTORmodul level controllers are designed for use in steam boilers, pressurized hot water systems, condensate tanks, and feedwater tanks. They interface with level electrodes NRG 21 / NRG 26-21 or transmitter NRGT 26, converting the signal to a 0–100% indication of the boiler’s measuring range.

Control Versions

  • NRR 2-50: Three-position PI controller for electric valve actuators. Provides open/close commands via two relay contacts.
  • NRR 2-51: Continuous PI controller for electro-pneumatic valves, with 4–20 mA control output.
  • NRS 2-50: Level switch for MIN/MAX alarm signaling.
  • NRS 2-51: Level switch with additional on/off control for feedwater pumps.

Process Operation

The controller compares actual level to setpoint and actuates the feed or discharge valve, depending on fill or discharge control configuration. Upon reaching MIN or MAX limits, an alarm relay is triggered after a 3 s dropout delay. Electrode, transmitter, wiring, or configuration faults are indicated as error codes on the 7-segment display.

Electrical Data

  • Supply: 24 VDC ±20%
  • Protection: external fuse 0.5 A
  • Power consumption: 2 W (NRR), 4 W (NRS)
  • Output contacts: 8 A, 250 VAC / 30 VDC
  • Analog output: 4–20 mA, max load 500 Ω
  • Mounting: DIN rail TH 35, EN 60715
  • Enclosure: IP40 housing, IP20 terminals, IP65 with panel adaptor

Selection Criteria

Selection depends on sensor type, valve actuation method, analog output requirements, MIN/MAX alarm logic, and pump or valve control logic. Not suitable for use in explosive atmospheres.

Typical Applications and Use Cases

  • Steam and hot water boiler level control
  • Feedwater tank monitoring
  • Condensate tank level management
  • Integration with electric or pneumatic actuators
  • Alarm signaling for process safety

Compatible with water and steam media. Designed for industrial environments requiring compliance with EN 60715 and relevant electrical safety standards.

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 for land and marine applications

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

The SPECTORmodul focuses on ease of handling and reducing installation costs for boiler automation. 

GESTRA provides demand-based solutions with parameterization, focusing on the most essential functions to ensure controller operation is intuitive and easy-to-use.