Product Introduce
AFTL tuning fork vibration level switch is caused to vibrate by the resonance
of the piezoelectric crystal. When effected by the material damping, the amplitude
suddenly reduces, then the frequency and phase change significantly. These
changes will be detected by the internal electronic circuit, and be transformed into
a switching signal output. The product can monitor, control and alarm the high and
low bit of tanks. Also it is suitable fora variety of liquid, powder, granular solid. It is
practical, simple, reliable, adaptable and maintenance-free. The tuning fork
and output have working condition and diode indicator, which can be adjusted as
habit. Also it has two power supply input modes(220V AC and 24V DC) and many
power supply output modes(DC output type, DC voltage output type, relay contact
output type). All types have high and low alarm sets, which can be done sensitivity
setting according to the situation.
Technical Parameters
medium temperature range: -20 ° C to 220 ° C
ambient temperature: -20 ° C to 80 ° C
ambient humidity: ≤ 95% RH
measured medium: liquid, powder or granular solid
measured medium density: solid ≥ 0.1g/cm3, liquid ≥ 0.7g/cm3
measured solid particle size: ≤ 10mm
maximum liquid viscosity: <1000mm2 / s
measured medium repose angle: ≥ 200
pressure range: ≤ 1MPa
shell material: die-casting aluminum alloy
fork material: 1Cr18Ni9Ti
protection: IP65
connection: 1 "NPT thread / flange (two ways)
electrical parameters:
1: power supply : 24 V DC; 220V AC 50Hz
2: output signal: relay output double-pole double-throw (DPDT)
contact capacity: 8A 220V AC 4A 24V DC
3: power consumption: ≤ 2W
tuning fork vibration frequency: 300 ± 50Hz
ambient vibration level: V.L.4 acceleration is not more than 1g
switch signal operating time: 1-60s
Electrical Connection
red light: power indicator. green light: fork status indicator.
1, 2 terminals: 220V AC
3: ground
4: DC 24V +
5: DC 24V -
6, 7, 8, 9, 10, 11 terminals are relay output contacts.
Debugging When limit alarm is L, the fork vibration is indicated by green light
out. The terminal blocks 6, 7, 9 and 10 are normally closed, but 7, 8, 10, and 11
are open. Adjusting delay knobs can make alarm release delay 1 to 60s.
When limit alarm is H, the fork vibration is indicated by green light lit. The
terminal blocks 6, 7, 9 and 10 are normally closed, but 7, 8, 10, and 11 are open.
When the object touches the fork, the fork stops vibrating, then green light lits and
relay contact turns over. The terminal blocks 6, 7, 9 and 10 disconnect, but 7, 8,
10, and 11 close. Adjusting delay knobs can make alarm release delay 1 to 60s.
Usually, we dispatch status in L directly to choose relay output terminals to
reach upper and lower alarm.
Sensitivity adjustment: It is adjusted according to the density of medium. The
lower the density, the higher the sensitivity.
It may cause false positive in a strong vibration condition. You can solve it
by turning down the sensitivity.
After choosing the status indicate, please do wiring according to the
instructions and switch on the power. When you gently touch the tuning fork with
hands as material simulation, the status indicators should transform state. When
your hands leave, the indicator light restores. After doing this many times and
ensure normal work, you can start installation.