GESTRA NRG 16-38 S, Оригинальная инструкция по установке

Страница: 28 / 48

28
Application EN
Usage for the intended purpose
The level electrode NRG 16-38S, NRG 16-39S is used in conjunction with level switch NRS 1-50 for
water level limiting and level monitoring in steam boilers and (pressurised) hot-water installations on
board of seagoing vessels, mobile offshore platforms or river boats.
Water level limiters switch off the heating when the water level falls below the set minimum level
(low water).
Function
The level electrode
NRG 16-38S
is an equipment combination consisting of
1 level electrode NRG 16-11 (water level limiter) and
1 level transmitter NRGT 26-1S (continuous level monitoring).
The level electrode
NRG 16-39S is an equipment combination consisting of
2 level electrodes NRG 16-11 (water level limiter) and
1 level transmitter NRGT 26-1S (continuous level monitoring).
Water level limiter NRG 16-11 / NRS 1-50
The water level limiter is an equipment combination consisting of one or two level electrode(s) NRG
16-11 and
one
level switch NRS 1-50.
When the water level falls below the low level, the level electrode is exposed and a low level alarm is
triggered in the level switch NRS 1-50. This switchpoint "Low water level (LW)"is determined by the
length of the electrode tip.
After the de-energizing delay has elapsed, the two output contacts of the level switch NRS 1-50 will
open the safety circuit for the heating. The equipment has a factory set default de-energizing delay of
15 seconds to compensate for the movements of the ship.
The operation of the level electrode NRG 16-11 is based on the conductive measuring principle using
the electrical conductivity of the water for signalling water level. The self-monitoring function ensures
that an alarm will also be triggered if the electrode insulation is contaminated or has developed a leak
or if there is a malfunction in the electrical connection.
The level electrode is installed inside steam boilers or (pressurized) hot-water systems.
The protective tube mounted on site (see section
Examples of Installation
(pages 18, 19) ensures
correct functioning.
Continuous level monitoring NRGT 26-1S
The level transmitter NRGT 26-1S is a compact-type system consisting of a capacitance level elec-
trode with integrated level transmitter. The equipment works according to the capacitance measure-
ment principle and provides a level proportional measuring current of 4-20 mA. The level transmitter
continuously monitors the liquid level in steam boilers or hot-water installations.