Gestra NRG 26-60 Level Electrode

Data sheet 819916-01 Issue date: 11/22
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Level Electrode
NRG 26-60
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Description
Technical data
The NRG 26-60 level electrode can be used with an
NRR 2-60 / NRR 2-61 level controller for continuously measuring the water level in steam boiler and hot-water plants or
in condensate and feedwater tanks.
Model and mechanical connection
■ In combination with the NRR 2-60/NRR 2-61 level controller, the electrode can be used as a level control system
with MIN/MAX alarm, for example.
■ The NRG 26-60 level electrode can be used in fluids with different conductivity.
Visualisation and operation take place via the URB 60 control terminal or SPECTORcontrol operating unit.
■ Thread G¾ A, EN ISO 228-1 Nominal pressure rating, admissible service ­pressure and temperature
■ PN 40 32 bar (abs) at 238°C Materials ■ Terminal box: 3.2581 G AlSi12, powder-coated
■ Sheath: 1.4301 X5 CrNi 18-10 ■ Electrode rod insulation: PTFE ■ Screw-in body: 1.4571, X6CrNiMoTi17-12-2
NRG 26-60
Function The NRG 26-60 level electrode works using the capacitance measurement principle and converts the information on the
water level into a data telegram. The 0-100% measuring range can be scaled by modifying the effective length of
the electrode rod.
Automatic self-test An automatic self-test cyclically monitors the safety and function of the level electrode and measured value acquisition.
Faults in the electrical connection or electronic measuring equipment trigger fault indications and alarms.
The data are transferred to the NRR 2-6x level controller via an ISO 11898 CAN bus in the CANopen protocol.
pH value ■ Maximum admissible = 10 Max. installed length at 238°C, all measurements in mm
■ see “How to order and specify”, Fig. 1 table ■ Do not shorten the electrode rod.
Measurement quality The information below applies to a fluid conductivity range
from 0.5 – 10000 µS/cm adjusted for temperature based on 25°C.
■ Reading error:
± 1% of set measuring range at the operating point ■ Resolution of reading on display: 0.1 %
■ Resolution for internal processing: 15 bit ■ Sensitivity (minimum conductivity)
◆ Water ≥ 0.5 μS/cm Supply voltage ■ 24 V DC ± 20% Power consumption ■ Max. 7 W
Current input ■ Max. 0.3 A Internal fuse ■ T2A Safety cutout at excessive temperature
■ Cutout occurs when an excessive temperature = 75°C is measured in the electrode tip
Input/output ■ Interface for CAN bus to ISO 11898, CANopen, insulated ■ M12 CAN bus connector, 5-pin, A-coded
■ M12 CAN bus socket, 5-pin, A-coded