OFFICINE OROBICHE 41A User Manual

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
n°1 Group
n°1 Displacer
A
Acc.c
A
316
2
(*) Parti interne STD in AISI316
41 A . A .
24010 Ponteranica (BG) ITALY - via Serena, 10 - Tel. 0039/035/4530211 - Fax 0039/035/570546 - www.officineorobiche.it-e-mail:info@officineorobiche.it
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JULY 14
OFFICINE OROBICHE S.p.A.
USER'S MANUAL FOR LEVEL SWITCHES
of the electrical SERIES 40
MODEL
n°1 Group n°2 Group
n°2 Displacer n°2 Displacer
B
BODY MATERIAL
304 316 PVC
I J P
DISPLACER MATERIAL(*)
PVC MOPLEN
5 6
CONTACT
SPDT DPDT
0 2
2 . 2 . M4
Information subject to changes without prior notice
n°2 Group
n°3 Displacer
C D
MOPLEN PVDF
M PF
PVDF
HG BULB
PF
VD
WATER-PROOF
golden contacts
M6
WATER-PROOF
. WP . R1 . XX
n°3 Group
n°3 Displacer
E
CONTACT TYPE
Current
BASIC
continuos
M3
M2
SEALED PNEUMATIC
with inert gas
M14
CASE
Ex-d
WP EP
FINNING
0 R1 R2
NON STD VERSION
/
1 13
WATER
PROOF
M4
Aluminium
PNA
R3
IST/153-I