GESTRA NRG 26-21

Level Monitoring

GESTRA NRG 26-21 Level Monitoring
GESTRA NRG 26-21 Level Monitoring
GESTRA NRG 26-21 Level Monitoring

GESTRA NRG 26-21 Level Monitoring

Reliable Boiler Water Level Control for Industrial Applications.
The GESTRA NRG 26-21 is a high-performance level monitoring sensor designed for continuous water level measurement in steam boilers and other pressurized vessels. It works in combination with GESTRA’s NRS control units, delivering fail-safe monitoring and enhanced safety in industrial steam systems.

Built with German precision, the NRG 26-21 ensures reliable level detection using the capacitive measuring principle, and is fully compliant with EN 12952 and EN 12953 standards.

The level electrode NRG 26-21 is used for continuous level monitoring in steam boilers and (pressurized) hot-water installations or in condensate and feedwater tanks.
In conjunction with the level switch NRS 2-.. and the level controller NRR 2-.. the electrode can be used as water level controller with MIN/MAX alarm.
The level electrode can be used in combination with the following level switches/controllers: NRS 2-50, NRS 2-51, NRR 2-50, NRR 2-51, NRR 2-52 and NRR 2-53.

  • The level electrode and the preamplifier NRV 2-29 work according to the capacitance measurement principle and translate the level changes into a level-dependent current signal, with the length of the electrode rod determining the measuring range.
  • The level electrode is installed inside steam boilers, vessels or in an external level pot. If the equipment is installed in a side the boiler or vessel, a protection tube provided on side ensures correct functioning.
  • The level electrode can be installed together with one GESTRA level electrode for water level limiting or for highlevel alarm in a single protection tube or external level pot.
  • The level electrode can be used in electrically conductive and non-conductive fluids.

Service pressure

PN 40, 32 bar at 238°C

Mechanical connection

NRG 26-621: Screwed G ¾ A, ISO 228

Materials

Screw-in body: 1.4571, X6CrNiMoTi17-12-2 Electrode rod insulation: PTFE

Length of installation / measuring range

NRG 26-21
Length of instal- lation at 238° C Measuring range
373 300
477 400
583 500
688 600
794 700
899 800
1004 900
1110 1000
1214 1100
1319 1200
1423 1300
1528 1400
1636 1500
2156 2000

Weight

NRG 26-621: approx. 1.8 kg (NRG 26-21 L=1000mm)

Pre-amplifier NRV 2-29 Supply voltage

12 V DC

Sensitivity of response

Range 1:         Water ≥ 20 µS/cm

Range 2:       Water ≥ 0.5 µS/cm Range 3:  Fuel oil EL er 2,3

Output

≥ 0 – ≤ 7 V DC, level proportional

Adjustor

1 Code switch with 6 poles for setting the measuring range

Housing

PPO (Noryl®)

Electrical connection

  • Screw-type terminal strip with 3 poles, cable gland with integrated cable clamp M 16

Protection

IP 65 to DIN EN 60529

Max. admissible ambient temperature

Max. 70 °C

Approvals:

TÜV type approvals acc. to VdTÜV Bulletin “Wasserstand 100”: Requirements made on water level limiting & control equipment.

Type approval: TÜV · WR · XX-317, XX-320, XX-425, XX-426,

XX-427 (see name plate)

GESTRA NRG 26-21

Level Monitoring

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

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