A tuning fork type liquid level switch is a new type of level switch. Tuning fork by crystal excitation vibration, when the tuning fork is material submerged when the vibration frequency changes, the frequency change detected by the electronic circuit out and a switch quantity output.
Working principle according to the material of the tuning fork vibration have no resistance tuning fork switch demo force, detect material level is reached or exceeded a certain height and issued the on-off signal, this principle don't need substantial mechanical movement, small driving power, does not need to be calibrated, rapid and low-cost start-up. Mechanical structure is simple, no mechanical moving parts, no maintenance, no wear, long service life, sensitive and reliable.
Tuning fork sensor to the natural frequency of vibration, when the tuning fork touches the liquid or other material, the inherent vibration frequency decreased, the energy consumption in the friction between particles, the forcing amplitude decays rapidly to stop vibration, the variation in the frequency of activation level switch, generates on-off signal.
Tuning fork type liquid level switch is also called "electrical float" where the use of floating ball liquid level switch and due to structure, turbulence, agitation, air bubble, vibration reasons which cannot use floating ball liquid level switch situations can be using "tuning fork type liquid level switch. Because the fork liquid level switch with no moving parts, so no maintenance and adjustment, is a substitute for float level switch upgrade. A tuning fork type liquid level switch is widely used in the industries of petrochemical, light industry, food, water treatment, etc., on level of / lower limit alarm and control.
Two, product features
The electric parameters and the density of the tested liquid have no effect on the measurement. Scaling, stirring, turbulence, bubble, vibration, medium viscosity, high temperature, high pressure and other adverse conditions for detection is also no effect.
Do not need to adjust the school:
Due to the tuning fork limit switch detection not to be affected by the measured dielectric parameters and density effects, so regardless of the measurement which liquid without field adjustment.
Freedom from maintenance:
Due to the tuning fork limit switch position detection by electronic circuit completed, no moving parts, so the installation and operation using do not need maintenance.
Three, typical applications
Tap water, mineral water
Pulp, glue, dye
Waste water, mud, acid and alkali solution
Liquid that can produce gas.
Beer, beer fermenting agent, beverage
Diesel and other dangerous places
Good solid powder material
Four, the main technical indicators
Power supply: 24VDC (standard);
Output mode: SPDT relay (SPDT)
Ambient temperature: -20 70
Medium temperature: -40 150
Working pressure: less than 2MPa
Medium density: minimum 0.6g/cm3
Delay: 1 ~ 50s (optional)
Power consumption: 0.5W
High and low alarm: the site can be set to HLFS (high alarm mode) or LLFS (low alarm
Electrical interface: 1/2 G"
Process connection: NPT thread installation (standard, optional BSPT); flange mounting (optional)
Enclosure protection: IP65
Anti explosion: II CT4 Exd
Five, installation method
Tuning fork limit switch usually uses side mounted (on the side of the silo wall installation) installed with the position of the side wall of the body of material position height of upper and lower position detection; when the inconvenience of the bin body side openings can be the top loading (on top of the warehouse installation) installation, the location should be choose the operation without material can be avoided when the material material impact position; also can be installed with the pipe to prevent the pump.