Operating Principle; Functioning; Outputs; Technical Features - ABB Comem OLI Instruction Manual

L I Q U I D L E V E L I N D I C AT O R - INSTRUCTION MANUAL
10
—

3. Operating principle

3.1
The level gauge with magnetic joint is composed of
a sturdy, watertight body made of aluminum alloy
powder coated to protect against corrosion.
The movement of the float rod and the pointer takes
place thanks to magnetic coupling and reaches a
120° angle. In this way, for every variation of the oil
inside the conservator tank the movement of the
float cause the rotation of the magnet joint with
consequent variation of the indication on the dial of
the gauge.
3.2.
STANDARD
(Comem OLI-
ComemL140)
OPTIONS (Comem eOLI)
Table 1
3.3
Material
Dial
Standard color
Ambient temperature
Oil temperature
Degree of protection
Standard cable gland
Wires
Electronic board features, only for eOLI
Power supply (terminals 1-2)
Power consumption
Analogical output (terminals 6-7)
Distance for analogical output
Digital output (terminals 3-4)
Distance for digital output
Ventilation Valve
Electronic board features, only for Viewer
Power supply (terminals 1-2)
Analogical input (terminals 3-4)
Distance for analogical input
Ventilation Valve
** For critical environmental conditions please contact ABB
Table 2
3.3.1
Breaking and making capacity
Voltage
24V DC to 220V DC
230 VCA
Table 3

Functioning

Outputs

MICRO-SWITCHES
ANALOG OUTPUT
COMMUNICATION PORT RS-485

Technical features

All the external parts are resistant transformer oils, salt fog and UV rays.
Tempered glass / Polycarbonate
RAL 7032**
-40°C up to +80°C
-40°C up to +120°C
IP66 according to EN60529 (Comem L340 available only IP65)
1 x M25x1.5 Comem OLI – Comem OLI22 – Comem L140 – Comem eViewer
3 x M25x1.5 Comem eOLI – Comem eOLI22
Max 2.5mm
24 Vdc ±10% polarized
1,5 W
4-20 mA (dielectric strength between electronic card and analogical output: 2kV)
Maximum resistance: 450 Ω
Accuracy : 2.5 % of full scale
Max 30 m / 98 ft (for different demands contact ABB)
Serial RS485 Modbus RTU (for more information contact ABB)
Max 30 m / 98ft (for different demands contact ABB)
n.1 to prevent the formation of condensation
24 Vdc ±10% polarized
4-20 mA
Max 30 m / 98 ft (for different demands contact ABB)
n.1 to prevent the formation of condensation

Microswitches

Uninterrupted current (making capacity)
2A
2 A
The pointer indicate the level that the oil should
reach at the temperatures printed on the dial.
The electronic version of the oil level gauge provide
an analogical and a digital signal proportional to the
oil level inside the conservator. These signals can be
remote to: PLC, PC, integrated monitoring system,
Remote Indicator.
An electronic level indicator equipped with 4-20 mA
output signal can be coupled with the electronic
Viewer. This device replicate the value of oil level
(0-100%) at man-height.
STANDARD CONFIGURATION
1, 2 or 4 change over contact (Fig.16)
4-20 mA (terminals 6-7) (Fig.17)
Maximum resistance: 450 Ohm
Modbus communication (terminals 3-4) (Fig.17)
2 – advised 4x1mm 2 o 6x1mm 2 shielded twisted pair cable
Interrupted current (breaking capacity)
100mA L/R < 40
2 A cosφ > 0.5