NIVOPOINT MR Series User manual
Thank you for choosing a NIVELCO instrument.
We are sure that you will be satisfied throughout its use.
APPLICATION
The NIVOPOINT MR series of magnetic float level switches are applicable for point level
switching (high or low) or for alarm (overfill, empty) in liquids.
In case of liquids containing metal particles protect the device by using a magnetic filter.
2. TECHNICAL DATA
Model MR _ _ _ MR _ _ _ Ex
Probe length 0,25...3 m
Material of wetted parts Stainless steel DIN 1.4571 / BS 316Ti)
Max. process pressure 2,5 MPa (25 bar) (at 20°C)
Medium density min. 0,7g/cm3
Medium temperature range -40°C to +150°C
Ambient temperature range -40°C to +100°C
Output 1 to 5 pcs. NO or NC reed relays
Switching rate 120 W / VA, 250 V AC, 3 A /reed relay, max. 9 A
Switch differential < 10 mm
Distance between switch points min. 110 mm
Screw terminals in housing with
Pg 16 for cables ∅7 to ∅14 mm
Screw terminals in housing with
Pg 16 for cables ∅9,5 to∅10
Electrical connection
Wire cross section: 0,5 to 2,5 mm2
Process connection 1" or 2" BSP/NPT
Sealing material Klingerit 400
Electrical protection Class I.
Mechanical protection IP 65
Dimension of the housing 110 x 80 x 65 mm 160 x 80 x 65 mm
Certificate for Ex versions −EEx d IIC T4-T6
Weight 0.4 kg + 0.3 kg/m 0.45 kg + 0.3 kg/m
USER’S MANUAL
Manufacturer:
NIVELCO Process Control Co
H-1043 Budapest, Dugonics u. 11.
Tel.: (36-1)-369-7575 Fax: (36-1)-369-8585
OPERATION
A magnetic float moving alongside the protection tube tracking
the level, is activating the reed relays incorporated the tube. After
passing of the float, the reed relays will retain their output state.
The device is capable of direct switching a load within its
specification.
INSTALLATION
The device should be mounted in vertical position via its process
connection and handled with care to avoid any damage or bend
of the protection tube during transportation or installation.
After fastening, the position of the cable gland can be rotated
±180°as well as the position of reed relays can be set ±25mm.
Both adjustments can be done by the switch point adjustment
gland, as follows:
– loosen the nut above the hexagon neck
– turn the housing as well as adjust the reed relays vertically to
the required position
– tighten the nut
Use a wrench at the hexagon neck to hold the device against
rotation while loosening and tightening the nut.
WARNING!
The switch point adjustment gland must not be
loosened in tanks under pressure.
DIMENSIONS
86
155-20518 or 24
L1
L2
L3
L4
L5
min.85
min.
110
min.
110
min.
110
min.
110
min.
80
Ln=500-3000
Pg16
S=55 or 70
1” or 2”
± 25mm (adjustment)
Ø 52
Ø 12
Figure 1.: Dimensions of the standard version
min.
110 min.
110 min.
110 min.
110
99
155-205
18 or 24
L1
L2
L3 L4
L5
min.85
min.
80
Ln=500-3000
Pg16
S=55 or 70
1” or 2”
± 25mm (adjustment)
Ø 52
Ø 12
Figure 2.: Dimensions of the Ex version
ORDER CODE
NIVOPOINT MR
--
FLOAT
Ø
52 x 52
Ø
52 x 52/Ex
3
7
SWITCH POINT
1 pc. NO/NC
2 pc. NO/NC
3 pc. NO/NC
4 pc. NO/NC
5 pc. NO/NC
1
2
3
4
5
LENGTH
0 m 0
1
2
3
1 m
2 m
3 m
CODEPROCESS CONNECTION
G1“ A
CG2“
NPT 1“ D
GNPT 2“
0 m
0,1 m
0,8 m
0,9 m
1
……
0
8
9
LENGTH CODE
CODE
CODE CODE
ELECTRICAL CONNECTIONS
Standard model
Remove the cover, pass the wires through the cable gland and
connect them in accordance with the sketch on the cover where
the state (NO/NC) of the relays is marked.
The terminal of the lowest switch point has to be number by 1.
„C” is common terminal.
The cross section of the connecting cable has to be between 0.5
and 2.5 mm2.
After replacing and fixing the cover, arrange earthing at the
ground screw located on the outside of the housing.
Ex version
Remove the clamp, fixing the cover and screw down the cover.
Pass the wires through the cable gland and connect them in
accordance with the sketch on the cover where the state
(NO/NC) of the relays is marked.
Arrange earthing. Tighten screws of the cable fixing bridge on the
gland and screw up the cover.
Fasten retainer clamp by setting it into one of the notch of the
cover.
The terminal of the lowest switch point has to be number by 1.
„C” is common terminal.
The cross section of the connecting cable has to be between
0.5 and 2.5 mm2.
Tighten screws of the cable fixing bridge on the gland and screw
up the cover. Fasten retainer clamp by setting it into one of the
notch of the cover.
After replacing and fixing the cover, arrange earthing at the
ground screw located on the outside of the housing.
LEVEL
12
NO
Ground screw
Terminal
Marking
of rela
y
t
y
pe
NC
345C
Figure 3.: Housing with removed cover
MAINTENANCE, REPAIR
The instrument does not require regular maintenance. In some
instances, however, the sensor probe may need occasional
cleaning to remove surface deposits. This must be carried out
gently, without harming the sensor probe.
Repairs during or beyond the guarantee period are carried out
solely by the manufacturer. Equipment sent back for repair
should be cleaned or sterilised by the User. The User must
declare that the above has been carried out.
STORAGE CONDITIONS
Environment temperature range: -25°C to +60°C
Relative humidity: max. 98 %
WARRANTY
All Nivelco products are warranted free of defects in materials or
workmanship for a period of two years from the date of purchase.
Repairs under guarantee are carried out at the Manufacturer's
premises. The Purchaser is liable for costs of dismantling and
re-installation as well as transport costs.
Nivelco shall not be liable for misapplication, labour claims, direct
or consequential damage or expense arising from the installation
or use of equipment.
mra1053a0600h_03
06.06.2000.
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