OFFICINE OROBICHE 41A User manual

OFFICINE OROBICHE S.p.A. 1 / 13
USER’S MANUAL FOR LEVEL SWITCHES
of the electrical SERIES 40
24010 Ponteranica (BG) ITALY - via Serena, 10 - Tel. [phone] - Fax [phone] - www.officineorobiche.it-e-mail:[e-mail]
**********************************************************************************************************************************************************
JULY 14 Information subject to changes without prior notice IST/153-I
1. INSTRUMENT DESCRIPTION
The instruments of the 40 series are positive buoyancy level switches for mounting on vessel head.
They are equipped with various switching units to provide independent alarm and/or signalling contacts.
Model 41A provides a low or high-level alarm contact.
Model 41B is designed for pump control.
Model 41C is equipped with two independent alarm contacts.
Model 41D/1 is designed to control two pumps, of different capacity.
For instance, to allow a vessel to remain full, if the level lowers, the first (small) pump will be actuated, but if the level
continues to fall, the second (large) pump will be started.
The large pump will be started and stops under the small pump’s threshold.
The instrument can even be used to keep a tank empty, in which case the operation of the two pumps is reversed.
Even model 41D/2 manages two pumps. It is used to drain a vessel.
In this case, the two pumps start at different levels but both only switch off after the level has reached the lower displacer.
Model 41D/3 combines the pump start and stop functions with a low-level alarm.
Model 41D/4 combines the pump start and stop function with a high-level alarm.
The instrument 41D/5 manages two pumps. It is only used to fill a tank.
In this case, the two pumps start at different levels but both only switch off after the level has reached the upper displacer.
The instruments are designed to be mounted on top of pressure vessels, in a vertical position.
The adjustment of the operation points takes place by adjusting the position of the displacers along the instrument’s rope.
The models can be equipped with SPDT or DPDT exchange contacts for a low or high-level control and/or alarm; the
contacts can be electric or pneumatic in type.
2. MODEL IDENTIFICATION
(*) Parti interne STD in AISI316 M4
CASE
Current
continuos
Aluminium
PNA
with inert gas
HG BULB
M6 M14
WATER
PNEUMATIC
WATER-PROOF
WP Ex-d EP
MOPLEN PVDF
BODY MATERIAL
n°3 Displacer
DA B C
n°2 Group
n°2 Displacer
n°1 Group
n°1 Displacer n°1 Group n°2 Displacer
XX
PVDF
PF
FINNING
0 R1 R2 R3
NON STD VERSION
. . . .WP R1
MODEL
M441 A A 2 2. . .
DISPLACER MATERIAL(*)
Acc.c 304 316 PVC
A I J P M
2 5
316 PVC
CONTACT
BASIC
VD
MOPLEN
6
M2
golden contacts
WATER-PROOF SEALED
SPDT DPDT
0 2
PROOF
n°3 Group
n°3 Displacer
E
CONTACT TYPE
PF
n°2 Group
M3

OFFICINE OROBICHE S.p.A. 2 / 13
24010 Ponteranica (BG) ITALY - via Serena, 10 - Phone [phone] - Fax [phone] - www.officineorobiche.it-e-mail:[email protected]
*************************************************************************************************************************************************************
JULY ’14 Information subject to change without prior notice IST/153-I
3. OPERATING PRINCIPLE
The operating principle is displacer-based.
The displacer (1), partially or thoroughly immersed in the liquid, undergoes a
hydrostatic thrust the reduces the load on the spring (6) which, being
connected to a rod, pushes a small magnetic piston upwards (2).
On the pit (3), one or more tripping units are mounted, which is schematised
in the diagram, composed of a magnet (4) and a miniature switch (5) that are
connected to one another by means of levers.
In low level “A” condition, the magnet (4) is idle, in the high level “B”
condition, the magnet (4) is drawn by the piston (2), and this causes the
actuation of the miniature switch (5).
The difference in height between low level and high level of the fluid is
called “tripping differential”.
The connection between the spring and the displacer is performed by means
of a rope. By moving the displacer along the rope, the tripping position
changes.
4. INSTALLATION
4.1 FITTING ON THE SYSTEM
Before installing the unit, check the vessel connections and those of the instrument for compatibility.
Burdening the instrument with external loads is strictly forbidden and it is the user’s duty to protect it from stress; using the
system as a rest point is strictly forbidden.
To avoid the effects of galvanic corrosion, no use of materials featuring different electrochemical potential is allowed. The
user shall apply all the technical expedients that are aimed at safeguarding the unit from such occurrence.
The system shall be equipped with the prescribed safety valve, to avoid overpressures that exceed the limit value.
The instruments shall be installed in vessels equipped with stilling pipe/displacer guide (A).
Before actuating the instrument, ensure that the stilling
Tube is perfectly upright and has a diameter that suits the
displacer (about 5 mm of air around the displacer.
Ensure that the connection to the tank is horizontal
And perpendicular to the stilling pipe.
Adjust the rope length to that of the vessel and
Place the displacer at the desired height.
For installation on vessels that are exposed to
strong vibration, please contact our customer
service department.
4.2 ELECTRICAL WIRING
The instrument is equipped with a terminal block located inside the housing.
For connections (NC - C - NO), please refer to the drawing provided on this page.
Make sure the housing lid is closed before injecting voltage.
The user shall provide for suitable ground connections to protect
the working staff and any other equipment possibly present.
NO=NORMALLY OPEN
C=COMMON
NC=NORMALLY CLOSED

OFFICINE OROBICHE S.p.A. 3 / 13
24010 Ponteranica (BG) ITALY - via Serena, 10 - Phone [phone] - Fax [phone] - www.officineorobiche.it-e-mail:[email protected]
*************************************************************************************************************************************************************
JULY ’14 Information subject to change without prior notice IST/153-I
5. SETTING AT WORK
Make sure that the use of the instrument does not exceed the intended conditions of use (higher temperature and pressure
values, lower specific weight) and that the applied electrical rated value complies with the rating plate values.
Verify that the instrument operates a correct switchover, by making the fluid level vary a few times.
6. CALIBRATION
The adjustment of the tripping unit is performed by moving the displacer along the rope the instrument is equipped with.
Ensure you have firmly locked the displacer before introducing it into the vessel.
No adjustment shall be made on the tripping unit, which is factory-set.
7. MAINTENANCE
We suggest carrying out a periodic routine servicing (once every 6 months approximately) to ascertain the correct service
state of the instrument.
All maintenance actions need to be carried out when the instrument is depleted of pressure and fluid, at room temperature (in
the event of units working at high or low temperature) and disconnected from the contact feeding voltage.
7.1 WARNINGS
- NEVER open the lid without being sure that voltage has been discontinued;
- NEVER leave the case without its lid for longer than the inspection time;
- NEVER use the instrument at a temperature or a pressure that exceeds the values specified on the rating plate;
- NEVER use the instrument at an electrical rating that exceeds the value specified on the rating plate;
- NEVER perform settings or replace parts without having read the instructions beforehand; in case of doubts, please contact
our customer service department;
-NEVER lubricate any part of the instrument;
-In cases when the instrument is used at high temperature values, always take all the precautionary measures required to
safeguard the working staff during the maintenance work stages.
7.2 ROUTINE CHECKS ON THE DISPLACER
Ensure the vessel is drained of all liquid.
- Separate the instrument from the vessel by unscrewing the related bolts.
- Extract the displacer by lifting the body flange (take care not to spoil or damage the rod, the displacer and the spring);
- Inspect the stilling tube and check it is clean from incrustation and/or deposit (if any such deposits are found, perform a
thorough cleaning);
- Remove the union and take care not to fold the rod;
- Inspect the pit inside making sure it is free from incrustation (clean with care if necessary);
- Place the union back in place;
- Ensure that the displacer, the rod and the spring are free from incrustation (carefully clean, if necessary);
- Manually lift and lower the spring unit, and check that the whole set can freely slide;
- If the spring shows corrosion marks, replace the parts;
7.3 REPLACING THE DISPLACER AND/OR THE ROPE
After pulling the displacer out (see par.7.2), hold the damaged displacer in place, unscrew the screw that locks it to the rope.
Place the new displacer, remember to lock it tightly to the rope.
If the rope shows marks of breaks, it needs replacing, by unscrewing the screw that locks it to the instrument.
The new rope, it too long, needs to be cut at the required length.
Remember to tightly lock the new rope before fitting the instrument back in place.
Perform all the checks as mentioned in paragraph 7.2.
7.4 ROUTINE CHECKS ON THE CONTACTS
Discontinue the voltage supply.
With the lid open, perform a sight check to ensure that the tripping unit does not have damaged or aged parts, manually
actuate the magnet to test whether the miniature switch correctly performs the switchover.

OFFICINE OROBICHE S.p.A. 4 / 13
24010 Ponteranica (BG) ITALY - via Serena, 10 - Phone [phone] - Fax [phone] - www.officineorobiche.it-e-mail:[email protected]
*************************************************************************************************************************************************************
JULY ’14 Information subject to change without prior notice IST/153-I
7.5 REPLACING THE ASSEMBLY AND/OR MINIATURE SWITCH
a) Use a gauge to measure the position of the switching unit;
b) Remove the wires from the terminal block (note the original connections), by
loosening the screw (2) and remove the switching unit;
c) Replace the miniature switch (1);
d) Place the switching unit back on top of the pit (3), in the same position as
measured before;
e) Perform the tripping adjustment by manually positioning the magnet (4)
against the pit (3), screw on the grub-screw (5) until the miniature switch
triggers and provide an over stroke turn before tightening the grub-screw;
f) Check miniature switch (1) for proper operation by means of an ohmmeter
and carry out some manual trip tests.
g) Reconnect the wires back into the terminal block as in b) above.
7.6 SETTING THE OPERATION POINT
See paragraph (6) CALIBRATION
8. DIMENSIONAL DRAWINGS OF THE BODY
Model 41A metallic
C ØDxL P.S. 0.6 0.65
0.7 0.75 0.8 0.85 0.9 0.95 1.0
H1 75 80 90 95 100 100 105 105 1104” –
DN100 94x180 L1 120 125 130 135 135 135 140 140 140
H1 100 110 120 120 125 135 140 150 150
3” – DN80 76x240 L1 160 170 175 175 185 185 185 190 190
C ØDxL P.S. 1.0 1.05 1.1 1.15 1.2 1.25 1.3 1.35 1.4
H1 110 110 115 115 120 120 125 125 1254” –
DN100 94x180 L1 140 140 145 145 150 150 150 150 150
H1 145 150 150 155 160 160 165 165 165
3” – DN80 76x240 L1 185 190 190 190 195 195 200 200 200
Model 41A plastic
C ØDxL P.S. 0.5 0.7 0.9 1.1 1.3
H1 83 116 135 146 154
4” – DN100 90x200 L1 146 164 174 181 185
H1 119 167 194 211 223
3” – DN80 75x290 L1 206 232 247 256 262
STD rope length =3 m
Dimensional values to be specified on the order: C = Connection flange
D/L = Displacer size
H/L = Operation points as from the displacer’s top

OFFICINE OROBICHE S.p.A. 5 / 13
24010 Ponteranica (BG) ITALY - via Serena, 10 - Phone [phone] - Fax [phone] - www.officineorobiche.it-e-mail:[email protected]
*************************************************************************************************************************************************************
JULY ’14 Information subject to change without prior notice IST/153-I
Model 41B metallic
C ØDxL P.S. 0.8 0.85
0.9 0.95 1.0
H1 100 100 105 105 1104” –
DN100 94x180 L1 135 135 140 190 140
H1 125 135 140 150 150
3” – DN80 76x240 L1 185 185 190 190 190
STD rope length =3 m
Dimensional values to be specified on the order: C = Connection flange
D/L = Displacer size
H/L = Operation points as from the displacer’s top
Model 41B plastic
C ØDxL P.S. 0.80 0.85 0.90 0.95 1.0
H1 64 78 90 101 111
4” – DN100 90x150 L1 136 139 142 144 146
H1 90 109 126 142 155
3” – DN80 75x215 L1 177 181 184 188 190
STD rope length =3 m
Dimensional values to be specified on the order: C = Connection flange
D/L = Displacer size
H/L = Operation points as from the displacer’s top

OFFICINE OROBICHE S.p.A. 6 / 13
24010 Ponteranica (BG) ITALY - via Serena, 10 - Phone [phone] - Fax [phone] - www.officineorobiche.it-e-mail:[email protected]
*************************************************************************************************************************************************************
JULY ’14 Information subject to change without prior notice IST/153-I
Model 41C metallic
C ØDxL P.S. 0.78 0.8 0.83 0.85 0.85 0.9 0.95 1.0
H1 63 70 78 84 65 75 85 100
L1 120 125 132 136 115 125 135 150
H2 87 89 92 94 85 90 95 100
4” –
DN100 94x180
L2 134 135 136 137 130 135 135 140
H1 82 90 103 110 80 100 115 135
L1 157 164 174 180 150 165 180 195
H2 115 118 122 124 115 120 130 135
3” – DN80 76x240
L2 176 178 180 181 175 175 180 185
C ØDxL P.S. 1.0 1.05 1.1 1.15 1.2 1.25
H1 60 70 80 90 100 110
L1 105 115 125 125 140 150
H2 60 65 70 75 80 80
4” – DN100 94x180
L2 100 105 105 110 115 115
H1 75 90 105 120 135 145
L1 135 150 165 175 185 195
H2 80 85 95 100 105 110
3” – DN80 76x240
L2 130 135 140 145 150 155
STD rope length =3 m
Dimensional values to be specified on the order: C = Connection flange
D/L = Displacer size
H/L = Operation points as from the displacer’s top
Model 41C plastic
C ØDxL P.S. 1.0 1.1 1.2 1.3
H1 55 86 112 134
L1 107 135 158 177
H2 46 60 71 81
4” – DN100 90x200
L2 90 101 110 118
H1 79 150 162 194
L1 150 190 223 251
H2 66 86 148 197
3” – DN80 75x290
L2 125 141 154 165
STD rope length =3 m
Dimensional values to be specified on the order: C = Connection flange
D/L = Displacer size
H/L = Operation points as from the displacer’s top

OFFICINE OROBICHE S.p.A. 7 / 13
24010 Ponteranica (BG) ITALY - via Serena, 10 - Phone [phone] - Fax [phone] - www.officineorobiche.it-e-mail:[email protected]
*************************************************************************************************************************************************************
JULY ’14 Information subject to change without prior notice IST/153-I
Model 41E metallic
C ØDxL P.S. 1.0
H1 60
L1 120
H2 70
L2 125
H3 70
3“ – DN80
4” – DN100 76x170
L3 115
STD rope length =3 m
Dimensional values to be specified on the order: C = Connection flange
D/L = Displacer size
H/L = Operation points as from the displacer’s top
Model 41E plastic
C ØDxL P.S. 1.0
H1 51
L1 113
H2 54
L2 109
H3 60
3“ – DN80
4” – DN100 75x150
L3 104
STD rope length =3 m
Dimensional values to be specified on the order: C = Connection flange
D/L = Displacer size
H/L = Operation points as from the displacer’s top

OFFICINE OROBICHE S.p.A. 8 / 13
24010 Ponteranica (BG) ITALY - via Serena, 10 - Phone [phone] - Fax [phone] - www.officineorobiche.it-e-mail:[email protected]
*************************************************************************************************************************************************************
JULY ’14 Information subject to change without prior notice IST/153-I
Model 41D metallic
Function 1 Function 2 Function 3 Function 4 Function 5
C DxL L1 L2 L3 L1 L2 L3 L1 L2 L3 L4 L1 L2 L3 L4 L1 L2 L3
3“ – DN80 76x240 105 103 106 -- -- -- 105 103 78 143 87 174 85 93 -- -- --
4“ – DN100 94x180 63 61 42 -- -- -- 63 61 44 94 68 133 67 75 -- -- --
3“ – DN80
4“ – DN100
76x170 -- -- -- 78 78 88 -- -- -- -- -- -- -- -- 78 88 88
Note: A = 270 mm with Displacer 76x240
A = 210 mm with Displacer 76x170
A = 210 mm with Displacer 94x180
The operation points are calculated with specific weight = 1Kg/dcm
3
STD rope length =3 m
Dimensional values to be specified on the order: C = Connection flange
D/L = Displacer size
H/L = Operation points as from the displacer’s top

OFFICINE OROBICHE S.p.A. 9 / 13
24010 Ponteranica (BG) ITALY - via Serena, 10 - Phone [phone] - Fax [phone] - www.officineorobiche.it-e-mail:[email protected]
*************************************************************************************************************************************************************
JULY ’14 Information subject to change without prior notice IST/153-I
Model 41D plastic
Function 1 Function 2 Function 3 Function 4 Function 5
C DxL L1 L2 L3 L1 L2 L3 L1 L2 L3 L4 L1 L2 L3 L4 L1 L2 L3
3“ – DN80 75x215 131 129 112 -- -- -- 131 129 104 170 75 164 72 80 -- -- --
4“ – DN100 90x150 91 90 81 -- -- -- 91 90 72 122 52 117 50 59 -- -- --
3“ – DN80
4“ – DN100
75x150 -- -- -- 68 68 78 -- -- -- -- -- -- -- -- 68 78 78
Note: A = 270 mm with Displacer 76x240
A = 210 mm with Displacer 76x170
A = 210 mm with Displacer 94x180
The operation points are calculated with specific weight = 1Kg/dcm
3
STD rope length =3 m
Dimensional values to be specified on the order: C = Connection flange
D/L = Displacer size
H/L = Operation points as from the displacer’s top

OFFICINE OROBICHE S.p.A. 10 / 13
24010 Ponteranica (BG) ITALY - via Serena, 10 - Phone [phone] - Fax [phone] - www.officineorobiche.it-e-mail:[email protected]
*************************************************************************************************************************************************************
JULY ’14 Information subject to change without prior notice IST/153-I
9. DIMENSIONAL DRAWINGS OF THE HOUSING
CODE FLUID TEMPERATURE
ELECTRICAL CONNECTIONS ∅A
∅-10÷+135 EP WP
R3 -11÷-80 1/2” NPT 1/2” NPT
R1 +136÷+250 3/4” NPT 3/4” NPT
R4 +251÷+400 1/2” UNI 6125 1/2” (GAS) ISO 228/1
3/4” UNI 6125 3/4” (GAS) ISO 228/1
ISO M20 x 1.5 1/2” UNI 6125
ISO M20 x 1.5
EP HOUSING (EEx-d IIC T6)

OFFICINE OROBICHE S.p.A. 11 / 13
24010 Ponteranica (BG) ITALY - via Serena, 10 - Phone [phone] - Fax [phone] - www.officineorobiche.it-e-mail:[email protected]
*************************************************************************************************************************************************************
JULY ’14 Information subject to change without prior notice IST/153-I
WP HOUSING (WATER PROOF IP66)
WP HOUSING (WITH CONNECTOR OUTPUT) CONTATTO SPDT
SPDT CONTACT
A B C D E F G
41A NO NC C
41B NO NC C
41C NO NC C NO NC C (*)
41D NO NC C NO NC C (*)
NOTA: (*) TERRA/GROUNDING

OFFICINE OROBICHE S.p.A. 12 / 13
24010 Ponteranica (BG) ITALY - via Serena, 10 - Phone [phone] - Fax [phone] - www.officineorobiche.it-e-mail:[email protected]
*************************************************************************************************************************************************************
JULY ’14 Information subject to change without prior notice IST/153-I
10. RECOMMENDED SPARE PARTS (*)
POS DESCRIPTION
1 Flange body
2 Spring protector
(*) 3 Displacer
4 Union
(*) 5 Gasket
6 Spring retainer
(*) 7 Rope
8 Screws
9 Spring assembly
(*) 10 Switch unit
(*) 11 Micro switches
12 Instrument nameplate
13 External grounding unit
14 Internal grounding unit
(*) 15 Housing gasket
16 Housing base
17 Housing cover
18 EP housing cover fastening group screw
19 WP housing base fastening group screw
20 WP housing cover fastening group screw
Always mention the instrument serial number in your request for spare parts.
This number is provided on the instrument rating plate that is fastened to the housing (see Pos.12) and is a five-digit number
preceded by the letter ”F”(e.g.: F45678).
11. FAULT FINDING
Level switches of the 40 series are not normally exposed to faults.
In cases when the level switch does not operate the switching, carry out the test on the displacer and on the miniature
switch as indicated in paragraph 7. MAINTENANCE.
12. DISPOSAL
When the instruments have come to the end of their service life, they need to undergo disposal. Always comply with the
applicable regulations in force.
During the disposal stages, specially mind the polymers, resins and rubbers used in the manufacture (PVC, PTFE, PP,
PVDF, neoprene, viton, etc.).
All metal parts, after the removal of seals and gaskets, special protective coatings requested by the customer and all other
plastic parts, can be recycled.
WARNING:
If the installed miniature switches are of the mercury bulb type (code VD), they must undergo disposal in compliance with
the regulations currently in force for harmful poisonous materials. Other types of miniature switches are not subject to these
regulations.
DISCONNE
OFFICINE

OFFICINE OROBICHE S.p.A. 13 / 13
24010 Ponteranica (BG) ITALY - via Serena, 10 - Phone [phone] - Fax [phone] - www.officineorobiche.it-e-mail:[email protected]
*************************************************************************************************************************************************************
JULY ’14 Information subject to change without prior notice IST/153-I
13. GUARANTEE
All the switches parts of the 40 series are guaranteed to be free from manufacturing faults over a period of 12 months
from the date of shipment.
In the event of failures, implying return of goods within the limit specified above, OFFICINE OROBICHE will replace
(shipment fees not included) all damaged parts free, provided that the failure does not ensue from incorrect use.
OFFICINE OROBICHE shall never be held responsible for any incorrect use of their products when these are used for
purposes other than those mentioned in the specifications approved at the order stage.
In these cases, no complaints will ever be taken into consideration.
No damage and/or fee, whether direct or indirect, ensuing from an incorrect installation or use shall ever be debited to
OFFICINE OROBICHE.
The instrument can be used for a maximum life period of 10 years dating from delivery.
When this period is over, there are two alternative options:
1) Replace it with a new instrument.
2) Have the old instrument overhauled by OFFICINE OROBICHE.
INSTRUMENT RETURN PROCEDURE
The instrument returning to the factory shall bear, in attachment, the following data:
1) Buyer’s name.
2) Description of the material.
3) Detected fault.
4) Process data.
5) Specification of the fluids that have been used with the instrument.
The instrument shall be returned perfectly clean and free from dust or deposits. Otherwise, OFFICINE OROBICHE reserve
the right not to carry out the servicing and return the instrument to the sender.
FINAL REMARKS
Each instrument is supplied fully assembled and equipped with all the needed accessories.
Some parts are sold separately under special circumstances only.
Therefore, we warn you to carefully inspect the supply and notify us at once if discrepancies are found.
N.B. IN CASES WHEN THE INSTRUMENTS ARE MEANT TO BE USED IN AREAS FEATURING POTENTIALLY
EXPLOSIVE ATHMOSPHERES, THE USER SHALL COMPLY WITH THE ADDITIONAL SAFETY
INSTRUCTIONS ATTACHED TO THE STANDARD ONES.