Flowserve ORGS 11-2 - Manual (Page 8)

8
Explanatory Notes
Scope of Supply
Function
ORGS 11-2
1 Oil detector & alarm ORGS 11-2, PN 6
2 Sealing plugs for cable entry
1 Installation manual
Description
The oil detector & alarm ORGS 11-2 works according to the conductivity
measurement principle. The ORGS 11-2 has a switching controller integrated in its
terminal box which controls all functions. External switchgear is therefore not required.
A control and alarm system installed downstream of the equipment protects the
installation to be cooled and prevents ingress of oil.
The equipment features two channels and the contact relays are of the normally
closed type and will automatically signal alarm condition in the event of a malfunction.
A water sample, taken downstream of the location at the highest point where ingress
of oil might occur, is fed from below into a measuring pot (see fig. 13 and 14,
page 17).
In the measuring pot the water-immiscible oil droplets precipitate and ascend, thereby
forming an oil film which forces the water level to drop accordingly.
The lowering of the water level is detected by the electrode rods since the oil, which is
non-conductive, interrupts the current flow between the two long and two short
electrode rods. Two volt-free relay contacts in the terminal box assess the information
and, if required, trigger an alarm and operate the associated switchgear.
The amount of oil necessary to raise an alarm depends on the design of the
measuring pot and the length of the electrode rods. The measuring pot is matched to
the electrode such that an alarm is given when the oil content limit of approx. 50 ml is
reached. The system can detect practically all insoluble, water-immiscible, non-
emulsified matter with a lower density than water and a conductivity below the preset
response sensitivity.
Design
ORGS 11-2:
Equipment module with three isolating valves and deaerator ready for connection,
Fig. 2
ORGS 11-1 :
Measuring electrode as replacement for equipment module ORGS 11-2
Note
■ Rust preventing oils that are for instance emulsified in the cooling water
will not raise an alarm.