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NRG 26-60 - Installation & Operating Manual -
819875-00
Usage for the intended purpose
Use as a water level controller
The level electrode NRG 26-60 can be used together with a NRR 2-60 / NRR 2-61 level controller to con-
tinuously measure the water level in steam and water boilers, or in condensate and feedwater tanks.
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Together with the NRR 2-60 / NRR 2-61 level controller, the electrode is used as a water level control-
ler with MIN/MAX alarm.
Influences of the measured medium
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The NRG 26-60 level electrode can be used in media with varying conductivity. Conductivities of less
than 100 µS/cm can heavily influence the measured capacity, however. As a result, it is very important
to recalibrate the measurement range see page 38 at the operating point* after a cold start.
* Operating point of the system, see page 7.
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In order to achieve the greatest possible degree of reproducibility and maintain the measurement
quality (see “Technical data” on page 15), it is necessary to install the sensor in a protective tube
(see “Installation examples with dimensions” on page 25).
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The dielectric constant of the measured medium may require an adjustment to the measurement
frequency if it deviates significantly from the usual water (Er = 80). Please contact GESTRA Service.
Visualisation and operation
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Visualisation and operation take place using the URB 60 or SPECTOR
control operating terminal.
Applicable directives and standards
The NRG 26-60 level electrode has been tested and approved for use in the scope governed by the
following directives and standards:
Directives:
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Directive 2014/68/EU
EU Pressure Equipment Directive
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Directive 2014/35/EU
Low Voltage Directive
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Directive 2014/30/EU
EMC Directive
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Directive 2011/65/EU
RoHS II Directive
Standards:
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EN 60730-1
Automatic electrical controls – Part 1:
General requirements
Standards documents:
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VdTÜV Bulletin BP WASS 0100-RL
Requirements for water level control and limiting equipment
