Flowserve NRGT26-1 Manual de usuario descargar pdf (Pagina 5)

Explanatory Notes

System description

The compact system NRGT 26-1 works according to the capacitance measurement principle.

The NRGT 26-1 is used for signalling different levels in electrically conductive and non-conductive

liquids:

■

Level maintained within the control band deﬁned by two preset limits

The NRGT 26-1 has a level transmitter integrated in the electrode body which produces a standard

signal of 4 -20 mA. External switchgear is not required.

Function

Designs

The principle of capacitance measurement is applied to determine the level. The electrode rod and

the vessel wall form a capacitor. If the level of the dielectric located between the two capacitor plates

changes, the current which ﬂows through the plates changes proportionally to the level. A dielectric

is deﬁned as an insulating substance, which excludes many liquids such as water. In order to receive

a useful measuring result the measuring rod, which is submerged to varying depths in the liquid,

must be completely insulated. After the calibration of the zero point/measuring range (0 %/100 %)

the level can be read off from a remote display unit. The level measuring range can be changed

during operation.

NRGT 261:

Screwed design ¾" BSP, DIN ISO 228-1.

Fig. 2

NRGT 261S:

Flanged design for marine application DN 50, PN 40, DIN 2635. Fig. 3

Scope of supply

NRGT 261

1 Compact system type NRGT 26-1

with joint ring (of stainless steel 1.4301) D 27 x 32 to DIN 7603, bright annealed

1 Installation manual

NRGT 261S (for marine applications)

1 Compact system type NRGT 26-1S with ﬂange DN 50 (2"), PN 40 to DIN 2635

1 Installation manual

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Flowserve NRGT26-1 Manual de usuario Pagina 5