Cape-11A
Standard RF Admittance Level Switch can measure capacitance as well as
impedance between probe and vessel. It is suitable for dust and coal ashes level
measurement. The probe is not susceptible to material buildup. It is flexible
for various applications. Cape-11A is with modular design, easy for
installation and maintenance. External LED light is ideal for long distance
observation.
In Cape-11 RF
Admittance Level Switch series products, a probe is designed to detect the
change of capacitance and impedance between probe and vessel wall to fulfill
material level measurement and control. In its electronic unit, reactance between measurement electrode and the
wall of an empty vessel constitute a balanced bridge circuit which
outputs a stable oscillation signal. As medium level rises, measured medium
covers measurement electrode, reactance between electrode and the wall of
vessel changes. It causes imbalance of bridge circuit and stops the oscillation
as a result. A post-circuit is designed to detect the change of output signal
from bridge circuit and generate an alarm signal. In addition, oscillation signal at radio frequency is not only applied to the
measurement electrode but also applied to a shield pole through a 1: 1
voltage-follower, so measurement electrode and shield pole have the same
electric potential, phase, and frequency, but these two electrodes are
insulated from each other. Even if there is medium buildup on probe, because
there is no electric potential difference between measurement electrode and
shield pole, and the reactance change on shield pole has no effect on the
detection of post-circuit. Therefore, only reactance change on measurement
electrode induced by the filled medium between measurement electrode and the
wall of vessel will be detected by post-circuit. It eliminates the effect of
medium buildup on level measurement.
● Excellent flexibility, widely used for the level measurement of fly ash, solid granules and adhesive materials.
● With an external dual color LED indicator and housing with electronics can be rotated during installation to make the orientation of LED indicator convenient for long distance observation.
● Modular design for high reliability, easy installation and maintenance.
● Passed third party reliability tests and received certifications from the third party, guaranteed extreme high reliability.
● Inexpensive with super quality, high cost-effective ratio.
-
|
Medium
|
Medium Type
|
Solid granules and adhesive materials
|
|
Dielectric constant
|
≥1.6
|
|
Probe data
|
Probe length
|
250～2000mm
|
|
Shield length
|
90mm/240mm/300mm /590mm , can also be customized
|
|
Diameter
|
φ8mm/φ10mm
|
|
Materials
|
External housing
|
Aluminum alloy
|
|
Inner housing
|
Plastic
|
|
Probe metallic parts
|
SUS304, 316L
|
|
Probe insulation parts
|
PTFE
|
|
Power supply
|
AC
|
85～264V AC
|
|
DC
|
18～30V DC
|
|
Power consumption
|
≤3W
|
|
Switch delay
|
When immersed
|
1s
|
|
When laid bare
|
1s
|
|
Signal output
|
Relay
|
DPDT, 8A/250V AC/30V DC
|
|
Relay Delay
|
0～30s continuous adjustable
|
|
Operating conditions
|
Process temperature
|
-40～250℃
|
|
Ambient temperature
|
-40～70℃
|
|
Storage and transport temperature
|
-40～80℃
|
|
Approvals
|
Protection rating
|
IP66
|
● Electrostatic
precipitator bag, ash hopper and conveying pump in ash transport system at
power plant.
● Coal
ash bunker in coal ash collecting device at power plant.
● Soot
bin and silo in flue gas desulfurization apparatus at power plant.
● Limestone
silo in a sintering desulfurization apparatus.
For more information, please Contact：sales@jiweimeter.com
Previous：Reed-11 Remote Transmitter
Next：Cape-11P Guard RF Admittance Level Switch
