Operating and Maintenance Instructions : FCU 2110-5 / FCU 2210-5
Edition 1.10
HYDAC Filtertechnik GmbH
Page 13 of 52
5.4 Principle of Operation
Pressure
inlet
Outlet
1
2
3
4
5
6
7
8
9
11
10
Display
Keypad
Printer
Evaluation
module
13
RS232
interface
12
14
15
Suction inlet
18
17
16
Relays
A continuous oil current flows through an optical sensor (1), the sensor consisting of an infrared
semiconductor LED (2) and a receiver diode (3) opposite of it. The contaminant particles contained in
the oil current dampen the light beam in a pulse-like manner, this being classified and counted as
measurement signals according particle diameter by an evaluation module (4).
The measurement of the flow rate required to determine the purity rating is performed by an integrated
flow rate meter (5), whose signals are also routed to the electronic evaluation module (4).