SU0246.DOC 05/04
Änderungen vorbehalten!
Operating Instructions
GNR5C
Sight-Glass Level Controller
Figure. 1: GNR5C with threaded connectors and 2
BSM500W_/d34 bistable switches
Attention!
•
Use with low-viscosity media only which
neither tend to become sticky or encrusted,
nor precipitate crystals. Media may not
contain magnetic particles (e.g. metal chips).
•
Use only type S5/25d floats.
•
The float must be installed with the “TOP”
marking at the top.
•
Observe maximum temperature and pressure
ratings.
•
Do not allow to tilt during installation! Centre-
to-centre distance and squareness of the
flanges or threaded connectors should be
checked before installing the glass tube.
•
Observe correct installation order for sealing
rings (see drawing next page).
Functional Principle:
The GNR5C sight-glass level controller is mounted to the
side of a vessel or a tank. The gauge is filled with liquid
media to the same level as the tank via two shut-off
valves.
A magnetic float is located within the standpipe, which
indicates the current fill-level.
The glass tube is protected against damage with a
semicircular impact guard made of transparent PVC.
The magnetic float can also be used to activate optionally
available BSM 500 W... bistable switches (see also data
sheet SU0090).
Technical Data
Standpipe
Glass, DURAN. 34.5 x 2.75 mm
Float
Polypropylene (PP), type S5/25d
Fittings
Stainless steel 1.4404/316L with
EPDM sealing
Seals Silicon
rubber
Operating temperature
0 to + 110° C (120° C intermittent)
Operating overpressure
max. 1 bar
Length (flange centre-to-
centre)
300 to 2000 mm
Mounting
Flange: DIN 2642 DN 25 PN, steel
alternatively DN20 PN10 steel
or
threaded connector: G½" or G1"
Discharge stopcock
(optional)
stainless steel 1.4404
Electrical components
BSM 500 W... bistable switch
with 34 mm dia. pipe clamp
Installation Procedure:
GNR5C with Flanges:
•
Mount the top and bottom shut-off valves to the tank
flanges using suitable sealing materials. Do not yet
fully tighten the screws.
•
Insert the 11 x 12 x 5 mm silicon discs into the shut-off
valves.
•
Push the hose clamps for fastening the impact guard
and the sleeve nuts, along with the silicon rings (which
have been snapped into place inside the nuts), over
the standpipe (see figure 2).
•
Insert the standpipe between the shut-off valves
making sure that is square.
•
Check the length of the glass tube! The tube must fit
flush against the silicon discs. Loosen the flange
screws if necessary to correct distance and
squareness.
•
Retighten the flange screws.
•
Push the sleeve nuts up to the shut-off valves and
tighten (46 mm open-end wrench).
Tighten the sleeve nuts!
•
Attach BSM 500 W… bistable switches if used (the
cable gland must always point down).
•
Mount the transparent impact guard (see figure 2).
•
After the vessel has been filled, check all fittings for
leaks!
