OFFICINE OROBICHE PL Series, Instruction Manual, Page: 4 / 7

OFFICINE OROBICHE S.p.A.
4/7
24010 Ponteranica (Bergamo) ITALY - via Serena, 10 - Tel. 0039/035/4530211 - Fax 0039/035/570546 - www.officineorobiche.it-e-mail:info@officineorobiche.it
*****************************************************************************************************************************************************************
JULY ’14 Information subject to change without prior notice IST/158-I
7.5 REPLACING THE UNIT AND/OR MICRO-SWITCH
a - use a gauge to measure the position of the switch unit;
b - disconnect the wires from the terminal board (make a note
of the original connections) and remove the switch unit by
loosening the screw (2);
c -replace the micro-switch (1);
d -return the switch unit in the pit (3) in exactly the same
position as before;
e-adjust the tripping position by manually moving the magnet
(4) against the pit (3), tighten grub screw (5) until the
micro-switch trips and allow for one extra turn before
locking the grub screw;
f - check that the micro-switch (1) works efficiently using an
ohmmeter and a few manual tripping checks;
g - reconnect the wires to the terminal board as per point b.
7.6 SETTING THE OPERATION POINT
-The switching unit is factoryt-set to the minimum operation value.
-To set the operation point to the desired flow rate value, take the following steps:
a –place the switching unit on the top of the pit (3) by loosening screw (2);
b –adjust the fluid to the desired flow rate;
c –slowly lower the switching unit until the switching takes place (from pos. “A” to pos. “B”);
If the requested alarm is a high flow-rate one, you can lock the switching unit, if it is a low flow-rate one, slowly lift
the switching unit until the magnet (4) returns to pos. “A” and lock it in this position by means of screw (2).
8. DIMENSIONAL DRAWINGS OF THE BODY
RESET point :+25% from the Set
Dimensional values demanded in the order:
B = Pipe
C = Connections
PL11
PL12
PL13
SET m/s
(Low flow)
MODELLO
MODEL
ØB
MIN.
6" sch.40
PL14
PL15
PL16
PL17
PL18
PL19
PL20
4" sch.40
4" sch.40
4" sch.40
3" sch.40
6" sch.40
4" sch.40
3" sch.40
4" sch.40
6" sch.40
WATER
WATER
AIR
0.7 - 1.4
1.2 - 2.4
4.5 - 8.0
0.1 - 0.6
0.4 - 0.9
0.4 - 1.0
1.1 - 2.7
WATER
WATER
AIR
WATER
4.0 - 7.0
0.3 - 0.7
0.4 - 0.9
WATER
FLUIDO
FLUID
WATER
WATER