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GESTRA NRGS 15-1 L=1000mm LEVEL ELECTRODE
GESTRA NRGS 15-1 L=1000mm LEVEL ELECTRODE

GESTRA NRGS 15-1 L=1000mm LEVEL ELECTRODE

GESTRA NRGS 15-1 level electrode is crucial for boiler and plant safety, as well as operational efficiency. Its primary purpose is to detect specific water levels (minimum, maximum, or intermediate levels) and to perform functions such as automatic pump control or alarm activation based on these levels.

Key areas of application include:

  • Steam Boilers:
    • Low Water Level Alarm/Limiter: Detects dangerously low water levels, automatically shutting off the burner to prevent boiler overheating. This is a vital safety function, especially for unattended boiler operations (24/72 hour) in accordance with standards like TRD 604, EN 12952, EN 12953.
    • High Water Level Alarm: Detects excessive water levels in the boiler, preventing overflow or carry-over of water into the steam line.
    • Level Control (Pump On/Off): Automatically controls feedwater pumps to maintain the boiler water level within a specified operating range.
  • Pressurized Hot Water Installations: Provides similar safety and control functions.
  • Condensate and Feedwater Tanks: Monitors water levels in these tanks and controls the automatic operation or shutdown of pumps.
  • Industrial Process Tanks: Used for level detection and control in other process tanks containing conductive liquids.
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GESTRA NRGS 15-1 operates on the conductometric measurement principle, meaning it detects the level by utilizing the electrical conductivity of the liquid. This compact system can signal up to four different water levels. It comprises four electrode tips and an integrated level switching controller.

The device's operating principle is as follows: When the electrode tips make contact with water or become exposed from the water (i.e., when they are "wet" or "dry"), the corresponding relay outputs are activated. These relays can be programmed for various functions, such as low-level alarm, high-level alarm, or pump control. Specifically, the functions of electrode tips 1 and 4 are fixed (typically low level and high level alarms), while the other two tips (2 and 3) can be configured via a code switch for various pump control (on/off, time-delayed) or additional low-level alarm functions.

The 1000 mm electrode length refers to the standard length of the electrode rod. During installation, these rods can be cut and adjusted on-site to define the desired switching points (alarm or control levels). The NRGS 15-1 offers high reliability and low maintenance requirements due to its lack of moving parts. Furthermore, it ensures a high level of safety through integrated test and reset buttons and self-monitoring functions.

  • Model: NRGS 15-1
  • Type: Compact Level Switch / Level Electrode
  • Measuring Principle: Conductometric measurement (electrical conductivity)
  • Number of Detectable Levels: Up to 4 different levels (low level 1, low level 2, pump control, high level)
  • Nominal Pressure (PN): PN 25 (suitable for operating pressures up to 25 bar at 224°C).
  • Max. Operating Temperature: 224°C.
  • Mechanical Connection: Typically G 1" male thread (ISO 228-1) or NPT 1" (optional).
  • Electrode Rod Length (L): 1000 mm (supplied as standard). Can be cut to define desired levels during installation. Rod diameter is typically 5 mm.
  • Body/Electrode Material: Stainless steel (e.g., 1.4571 / X6CrNiMoTi17-12-2 or 1.4404 / F316L). Electrode insulation is made of PTFE.
  • Power Supply: 115/230 VAC or 24 VAC (optional), 50/60 Hz.
  • Output: 4 potential-free relay contacts (8 A 250 V AC / 30 V DC). One relay is assigned to each electrode tip.
  • Sensitivity (Min. Conductivity): > 0.5 µS/cm or > 10 µS/cm (at 25 °C, switch-selectable).
  • Delay Times: 1 second (fixed) for relays 1 and 2, or 0-30 seconds (adjustable) for relay 3 (e.g., for pump control). Relay 4 has a fixed 3-second delay.
  • Protection Class: IP 65 (according to EN 60529), NEMA Type 4.
  • Features: Integrated level switch, adjustable functions (via code switch), LED status indicators, test and reset buttons, maintenance-free design (no moving parts), high reliability.
  • Approvals: EC type approved according to PED (Pressure Equipment Directive) 2014/68/EU, in accordance with relevant standards such as EN 12952/EN 12953, TRD 604.