afriso OM 1 Notice Technique page 59

4 Product description
4.1 Overview
The product consists of a control unit and one or several probes. Depending
on the type ordered, the following probes can be connected:
• OM 5: 1 to 5 photoelectric probes (optional)
• OM 5+1: 1 to 5 photoelectric probes, 1 floating probe (one each in scope
of delivery)
• OM 1: 1 photoelectric probe (permanently connected)
The product monitors for accumulations of liquid at up to five independent
locations. If one or several photoelectric probes are submerged in liquid, the
control unit detects the change in the probe signal and generates visual and
audible alarms. The alarm signal can be transmitted to external equipment
(for example, horn or warning light with rotating reflector) via the output relay.
Photoelectric probe
B
A
Fig. 1: Photoelectric probe
The photoelectric probe detects the different optical and conductive charac-
teristics of air and liquids. The probe of an infrared transmitter and an infrared
receiver located at a specific distance from each other. These two parts form
a light barrier. If there is air between the transmitter and the receiver, most of
the infrared light transmitted by the transmitter is received by the receiver. If
the probe is submerged in liquid, only a small portion of the infrared light
reaches the receiver and an alarm is triggered.
The probe is mounted at the lowest point of the area to be monitored (lying
or suspended). The probe detects accumulations of liquids at a height of
approximately 4 mm. A three-wire cable is used for connection to the control
unit.
Product description
C
A. Transmitter
B. Receiver
C. Three-wire probe cable
OM 5 / OM 5+1 / OM 1
EN
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