NIVELCO MR Series User manual

Thank you for choosing a NIVELCO instrument.
We are sure that you will be satisfied throughout its use.
1. APPLICATION
The interaction of the magnetic float and the reed relays (incorporated in the protection tube) is the basis of the
NIVOPOINT magnetic float level switch series operation. They are suitable for level indication of normal and explosive
liquids, and can be used for level control tasks. The protecting tube contains a max. of 5 relays. Parts of the instrument are:
probe tube with magnetic float and housing containing the connection terminal.
The magnetic float moves alongside the protection tube tracking the level of the liquid and activating the reed relays.
As the float passes a relay it changes the output state of the relay which retains this state latching until the level decreases
and the float moves again along the respective relay to switch its state back.
2. TECHNICAL DATA
2.1 GENERAL DATA
TYPE MR – MP–  MR–  Ex
Insertion length 0.25 m ... 3 m
Material of wetted parts Stainless steel
(DIN 1.4571 / BS 316Ti)
PVDF float / PFA coated
guiding tube
Stainless steel
(DIN 1.4571 / BS 316Ti)
Max. process pressure 2.5 MPa (25 bar) at +20 °C 0.3 MPa (3 bar) at +20 °C 2.5 MPa (25 bar) at +20 °C
Medium density min.0.8g/cm3min.0.5g/cm3min.0.6g/cm3min.0.8g/cm3
Nominal float dimensions* ∅52x59mm** ∅96 mm** ∅76 x 87 mm ∅52 x 59 mm
Medium temp. range -40 °C ... +150 °C -40 °C ... +80 °C
Ambient temp. range -40 °C ... +100 °C -40 °C ... +100 °C
See table of temperature
classes
Output 1 ... 5 pcs reed-switches, connecting one side of each, NO/NC
Switching rate 120 W / VA, 250 V AC/DC, 3 A /reed relay, max. 9 A
Switch differential < 10 mm
Distance of switches min. 110 mm
M20x1.5 for cables ∅6 to ∅12 mm M20x1.5 for cables ∅9.5 to
∅10 mm
Electrical connection
terminal, wire cross section: 0.5 to 2.5 mm2
Process connection 1” BSP, 2” BSP
1” NPT, 2” NPT
PP flange
DN 80, DN 100
1” BSP, 2” BSP
1” NPT, 2” NPT
Sealing material Klingerit 400 — Klingerit 400
Electrical protection Class I, Protecting cable 4 mm2
Ingress protection IP 65
Certificate for Ex versions —II 2 G EEx d IIC T3 …T6
Dimension of the hous. 116 x 80 x 65 mm 124 x 80 x 65 mm
Mass 0.4 kg + 0.3 kg/fm 0.45 kg + 0.3 kg/fm
* dimensions of the float depend on the order
** for the exact size of the float see dimensions
2.2 ADDITIONAL DATA FOR EX APPROVED MODELS
TEMPERATURE CLASS
CLASS T6 T5 T4 T3
Max. ambient temperature 80 °C 95°C 85°C 70°C
Max. medium temperature 85°C 100°C 135°C 150°C
N I V O P O I N T
USER’S MANUAL
1418
2.3 ACCESSORIES
−User’s Manual
−Certificate of Warranty
−Declaration of Conformity
−1 pc Gasket (for threaded versions)
2.4 ORDER CODE
NIVOPOINT M – – ***
TYPE CODE CONNECTION CODE SWITCH POINT CODE LENGTH CODE LENGTH CODE FLOAT / EXCODE
Standard R1” BSP A1 pc. NO/NC 10 m 00 m 0**** / normal 3
2” BSP C2 pcs. NO/NC 21 m 10,1 m 1
Standard / plastic
coating and float P1” NPT D3 pcs. NO/NC 32 m 2::
∅52 1.4571
/ Ex 7
2” NPT G4 pcs. NO/NC 43 m 30,8 m 8
DN 80 PN 16 PP P5 pcs. NO/NC 50,9 m 9
Notes: DN 100 PN 16 PP R
*** The order code of an Ex version should end in ’Ex’ **** Depends on the order ∅ 52/1.4571 MP version: ∅ 76/PVDF, ∅ 96/1.4571
BKI 02 ATEX 091X ♦mra1053a0600h_06♦2/1

2.5 DIMENSIONS
ORDINARY VERSION MR- EX VERSION MR- ORDINARY VERSION MP- TERMINAL BOX
Ø 53.5
~ 86
155 ... 205
18 or 24
1" or 2"
sliding sleeve
S = 55 or 70
min.85
L1
L4
L3
L2
L5
80
min. min. min. min. min.
1
10
110110110
Ln
adjustment
± 25
Ø 14
M20x1.5
1" or 2"
min.8580
L4
L3
L2
L1
1
10
110110110
Ø 96 or
Ø 53.5
Ø 14
sliding sleeve
155 ... 205
18 or 24
~ 99
M20x1.5
S = 55 or 70
min. min.min. min.min. L5
Ln
adjustment
± 25
M20x1.5
min.85
80
Ø 76
87
19
± 25
adjustment
L4
L3
L2
L1
Ln
110110 110
1
10
flange
~ 86
165 ... 215
min.
min. min. min. min.
L5
1 Ø 4
see
order codes
M20x1.5
3. INSTALLATION
For mechanical installation 1", 2" BSP or NPT threads can be used. Minimal gap diameter
for the float is ∅55 mm. Use the M20x1.5 cable gland for electrical connection.
The only version that can be installed without removing the float from the shaft and
reassembling it from the inside of the tank is the version with 2” (BSP or NPT) process
connection. If protection tube is used the minimum tube diameter should be ∅75 mm (for
insertion lenght < 1.5m and ∅95 mm for insertion length > 1.5m). When using a ∅90 mm
float the tube diameter should be min. ∅130 mm.
WARNING!
The sliding sleeve must not be loosened in tanks under pressure.
The unit 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.
4. WIRING
Depending on the grounding system either the inner or the outer grounding terminal should
be connected to the EP network.
STANDARD MODEL
Remove the cover. Feed the electrical cables through the cable gland and connect them in
accordance with the sketch on the cover where the (NO/NC) states of the relays are
marked. The terminal of the lowest switch point has to be number 1.
„C” is common terminal.
The cross section of the connecting cable has to be between 0.5 and 2.5 mm2.
EX VERSION
Remove the retainer clamp and screw the cover off. Feed the electrical cables through the
cable gland and connect them in accordance with the sketch on the cover where the
(NO/NC) states of the relays are marked.
Connect the grounding screw to the grounding system. Place the cover back and fasten the
retainer clamp by setting it into one of the notches of the cover.
2/2 ♦BKI 02 ATEX 091X ♦mra1053a0600h_06
5. SET UP, ADJUSTMENT
After screwing in and before tightening the sliding sleeve the direction of the cable gland and
the position of the reed-relay set can be adjusted.
An open-end wrench should be used when loosening or screwing tight the sliding sleeve.
The position of the reed-relay set can be vertically adjusted by a max. of ±25mm.
5.1 SPECIAL CONDITIONS OF THE EX APPLICATION
The apparatus met the requirements specified for mechanical strength with reduced impact
energy (4 J = 1 kg; 0.4 m).
On the basis of the above the place and way of installation should guarantee the protection
of the unit against external mechanical impacts during service.
6. MAINTENANCE, REPAIR
The instrument does not require regular maintenance. In some instances, however, the
probe may need occasional cleaning to remove surface deposits. This must be carried out
gently, without harming the probe.
Repairs during or beyond the guarantee period are carried out solely by the manufacturer.
Equipments sent back for repair should be cleaned or sterilised by the User. The User must
declare that the above has been carried out.
7. STORAGE CONDITIONS
Ambient temperature: -25 °C to +60 °C
Relative humidity: max. 98 %
8. WARRANTY
All Nivelco products are warranted free of defects in materials or workmanship for a period
of two years from the date of purchase, as indicated in the Certificate of Warranty.
mra1053a0600h_07
January, 2007
Nivelco reserves the right to change technical specifications without notice.