Description
The level electrodes NRG 1...-51 are used in conjunction with
level switch NRS 1-51 as high level alarm for steam boiler
plants and (pressurized) hot water installations.
A high level alarm prevents the water level from exceeding the
preset max. water level (HW) and for this purpose switches
off e. g. the feedwater supply
Technical data
Service pressure
NRG 16-51, PN 40, 32 bar at 238 °C
NRG 17-51, PN 63, 46 bar at 260 °C
NRG 19-51, PN 160, 100 bar at 311 °C
NRG 111-51, PN 320, 183 bar at 357 °C
Mechanial connection
Screwed G¾ A, ISO 228 (NRG 16-51, NRG 17-51,
NRG 19-51)
Screwed G1 A, ISO 228 (NRG 111-51)
Materials
Screw-in body: 1.4571 X6 CrNiMoTi 17-12-2
(NRG 16-51, NRG 17-51, NRG 19-51)
Screw-in body: 1.4529 X1NiCrMoCuN25-20-7
(NRG 111-51)
Measuring electrode: 1.4571 X6 CrNiMoTi 17-12-2
(NRG 16-51, NRG 17-51, NRG 19-51)
Measuring electrode: 1.4122 X39CrMo17-1 (NRG 111-51)
Electrode tip: 1.4401 X5 CrNiMo 17-12-2
Electrode insulation: PEEK
(NRG 16-51, NRG 17-51, NRG 19-51)
Electrode insulation: special ceramic (NRG 111-51)
NRG 1...-51: Four-pole connector: polyamide (PA)
NRG 1...-51F: Terminal box 3.2161 G AlSi8Cu3
Lengths available
500 mm, 1000 mm, 1500 mm
pH value
Max. admissible: 10 (only NRG 111-51)
Electrical conductivity
Max. admissible: 100 ?S/cm at 25 °C (only NRG 111-51)
Electrical connection
NRG 1-51: Four-pole connector,
cable gland M19 (PG 11)
NRG 1...-51F: Aluminium terminal box, cable gland M20
Protection
IP 65 to DIN EN 60529
Admissible ambient temperature
Max. 70°C
Weight
Approx. 1.2 kg (without extension)
(NRG 16-51, NRG 17-51, NRG 19-51)
Approx. 2.1 kg (without extension)
(NRG 16-51F, NRG 17-51F, NRG 19-51F)
Approx. 1.8 kg (without extension) (NRG 111-51)
Approx. 2.7 kg (without extension) (NRG 111-51F)
