Omega Engineering LV850 Manuale utente
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User’s Guide
LV850
Level Sensor
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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that
apply. OMEGA is constantly pursuing certification of its products to the European New Approach
Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.
LV850 LEVEL SENSOR
i
Please follow these installation, connection and adjustment instructions
carefully. Failure to comply with these instructions or misuse of this
equipment will void your warranty.
Equipment installation, connection and adjustment by qualified
personnel only!
LV850 LEVEL SENSOR
NOTES:
ii
LV850 LEVEL SENSOR
1 Description
Level Sensor LV850 is suitable for liquids with low relative dielectric constant
εr(e.g. oil). Units come with Minimum and Maximum selector switch.
It operates on the principle of electrical capacitance changes arising when an
electrode surrounded by air is immersed in the medium.
• LED status display
• Selection of minimum and maximum function by changeover switch.
Minimum switching
Normally the sensor is immersed and the green LED indicates. As the level
drops below the sensor the green LED extinguishes.
Maximum switching
Normally the sensor is not immersed and the green LED indicates. As the
level rises above the sensor the green LED extinguishes.
• In the event of a short-circuit in the load circuit, the green LED will
extinguish and the red LED will flash.
1
LV850 LEVEL SENSOR
2 Technical Data
Temperature range -20°C to +130 °C
(-4°F to +266°F)
short-time to +150°C
(+302°F)
Ambient temperature -20°C to +85°C
(-4°F to +185°F)
Pressure resistance max. 25 bar (367.5 PSI)
Response delay approx. 0.1 s
Degree of protection IP 65
Input voltage DC 9 ... 36 V
Option:
- metal coupling for pipe extension (see fig. 2) if the sensor is to be used as an
immersion sensor
mark to demonstrate compliance with applicable directive
2
LV850 LEVEL SENSOR
3 Level Sensor Installation
The Level Sensor may be installed in any attitude.
1. Ensure sufficient clearance space (see Fig. 1) in the container wall.
• Ensure a type 3/4" NPT or G3/4A thread in the container wall has been
provided.
2. Screw the Level Sensor into the threaded aperture using a recognized
sealing material.
3. When tightening the level sensor please use the flats provided (SW32).
Do not overtighten.
CAUTION
NOTE
3
LV850 LEVEL SENSOR
4 Connection
Check that the supply voltage corresponds with the voltage
rating shown on the system.
1. Loosen the gland (PG7)(see Fig. 1).
2. Unscrew the cover of the housing (C).
3. Feed the supply cable through the gland (PG7) and the cover (C), or
through the metal coupling supplied as option (see Fig. 2).
4. Connect the cable to the terminal block (TB) (see Fig. 3).
5. Set selector switch (S) to minimum or maximum:
1. - minimum
2. - maximum
6. Connect the supply voltage. LED (red) indicates.
CAUTION
4
LV850 LEVEL SENSOR
7. Increase the level until the Level Sensor is immersed in the medium.
8. Minimum Sensor:
• Turn the potentiometer screw (E) to (-) until the LED (green) extinguishes.
Then slowly turn to (+) until the LED indicates. Adjust the screw a further
full turn to (+) to compensate for any tolerance.
9. Maximum Sensor:
• Turn the potentiometer screw (E) to (+) until the LED (green) extinguishes.
Then slowly turn to (-) until the LED indicates. Adjust the screw a further
full turn to (-) to compensate for any tolerance.
10. Replace and tighten the cover (C) or the metal coupling (option).
11. Replace and tighten the cable gland nut (PG7).
The Level Sensor is now connected, adjusted and ready for operation.
5 Operating Difficulties
Problem: The Level Sensor fails to operate correctly.
Solution:
- The surface of the sensor probe should be carefully cleaned from inside the
container.
5
LV850 LEVEL SENSOR
NOTES:
6
Indice
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