OFFICINE OROBICHE S.r.l.
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ISTRUCTION MANUAL
Flow Switches PLJ & PLJ EN Series
24010 Ponteranica (Bergamo) ITALY - Via Serena, 10 - Tel. +39 035 4530211 - Fax +39 035 570546 - www.officineorobiche.it-e-mail:[email protected]
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NOV. 2020
Informazioni soggette a variazioni senza preavviso
IST/198-I
1. DESCRIPTION
Flow switches PLJ & PLJ EN are devices meant to control the flow of liquids.
Flow switch PLJ is available with 1” NPT-M or 1” GAS-M connection.
Flow switch PLJ EN is available with 1” GAS-M connection and it’s in compliance with the EN 12259-5:2003
Standard entitled «Fixed firefighting systems Part 5 - Water flow detectors».
2. TECHNICAL SPECIFICATIONS
PLJ Series
PLJ EN Series
Metal parts material
Stainless steel
Stainless steel compliant to EN-12259-5
Maximum working pressure 25 bar
25 bar
Room temperature limits
-20 °C / 85 °C
-20 °C / 85 °C
Liquid temperature limits
-30 °C / 120 °C
-30 °C / 120 °C
Protection rating
IP65
IP65
Set of vanes material
Stainless steel
Stainless steel compliant to EN-12259-5
Housing material
ABS
Painted aluminium
Pressacavi
M14
M20
Contact
Micro-switch SPDT 15 (8A)
24/250 VAC
Micro-switch SPDT 15A 125/250 VAC - 5A
24 VDC
3. ELECTRICAL CONNECTIONS
The COM-NC contact closes, at the calibration value, when the flow increases.
The COM-NO contact opens, at the calibration value, when the flow decreases.
4. INSTALLATION
Flow switches PLJ & PLJ EN can be mounted in any position.
The arrow must be oriented in the direction of the flow.
In the event of installation with vertical pipes, the instrument needs recalibrating to
compensate for the weight of the vanes.
Fit the instrument along a straight run of the piping, in the absence of filters, valves, etc.
and along at least five times its diameter, both upstream and downstream.
It’s possible to adjust the calibration of the instrument tightening or unscrewing the screw
shown in the picture.
