 Model Number |
Acoustic Wave type / Hanla-Auxitor |
■ General
Acoustic wave type LIDEC-L91/92 local sensor is specially designed and patented
for the marine applications. The series LIDEC L91/92 offers a reliable solution
for high level and high-high level (overfill)alarm detection of chemical, FO,
DO tank, etc.
The principle of this fully static system is based on the propagation of an acoustic
wave inside a metallic probe. A piezo-electric sensing element produces the wave
along the probe.
Without liquid, waves propagate without attenuation inside the metal of probe.
Subject waves are detected by a receptor which converts them into an electrical
signal, re-injected on the emitter, the gain being adjusted in order to obtain
a permanent oscillation on the loop.
As the liquid reaches the end of probe, a portion of the waves is absorbed, the
oscillation stops and the alarm is activated.
■ System Configuration
For the total system, safety barrier, alarm unit (as a converter current to on-off
signal) and annunciator are connected with local sensor LIDEC-L91/92.
■ Features
- Desinged for solution of safe construction which the probe does not work
as electrode for sparks between coming up liquid surface and highly voltage
charged by electro-statics during cargo loading.
- Fully static system with no moving parts.
- No special calibration depending on the liquid.
- Vibration, shock and electric interferences resistant.
- Pressure and temperature resistance.
- Desinged for all kind of liquid.
- Including fail safe system.
- Manual test device : Prior to loading or and time, the level alarm can easily
be tested by using a testing tool with permanent magnet.
■ Application:
These systems are used for the level alarm in cargo tanks of all kind of oil/chemical
carriers.
■ Standard Model and Application
- LIDEC - L91 : High level or overfill alarm.
- LIDEC - L92 : High level and overfill alarm.
■ System Selection for Order Conformation
■ Technical Specification
Alarm sensor
- Model
High alarm : LIDEC-L91
High and overfill alarm : LIDEC-L92
- Conn. size : JIS 5K 100A(standard)
- Conduit conn. size : JIS 5K 32A(standard)
- Material
Housing - SCS13
Flange - SUS304 or SUS316
Sensor probe - SUS316L
- Power supply : 18 to 28VDC
- Output : 4...20mA current loop with
6mA No alarm
18mA Alarm
- Operating Temp. : AMB -25°C to 70°C, Liquid -40°C to 150°C
- Protection : IP56 over
- Safety : EEx ia II C T6
Level Alarm Panel
- Mounting type : Wall mounting or console mouning
- Power supply : AC 110/220(main), DC 24V(back up)
- Consist of :
- Alarm annunciator/10ch
- Alarm unit for lidec sensor
- Safety barrier
- Power lamp
- Ac and DC power fail alarm
- Alarm buzzer
- External alarm : Horn & Light
Specification
- 10 channel annunciator
- Power supply : DC24V
- Indication LED's : 10 x Red(alarm), 1 x yellow(earth fail), 1 x Green(power)
- Function : Accept horn, Accept flash, Test function
- Input time delay : 0........99 seconds
■ Cargo Tank Level Alarm Panel
The cargo tank level alarm panel will be designed and arranged for level alarm
based on the number of tanks and tank lovation etc. The cargo tank level alarm
panel gives audible and visible alarm and also external alarm will be provided.
The individual external alarm will be provided in accordance with owner requirement
as optional items.
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