Standex Electronics
has developed a series of fluid level sensors
that eliminates issues caused by a second
conductive path that can exist between the
two sensor probes or along the walls of the
fluid container. This can dramatically affect
the sensitivity of the device, at some point
causing the system to fail. This Standex sensor
introduces a bias ring charged with an opposing
electrical polarity, which cuts these secondary
conductive paths and eliminates sensitivity
change issues due to material buildup.
Applicable in dirty fluids with substantial particulate matter
Capable of substantial miniaturization
Available in two wire and three wire versions depending on the application.
Suitable for most conductive fluids.
May be operated in a "pulsing mode" reducing power consumption,
reducing electrolysis and in some applications eliminating a third wire.
May be operated in an AC mode eliminating electrolysis.
Options:
Mounting
Screw,
Seal Grommet or Custom arrangements available
Operation Modes
DC,
Pulsed DC, & AC, with internal electronics
Passive Operation
Using
separate host electronics
Indication Delay
Up
to 1 second (on) and 0.2 second (off)
Supervision
Can
be equipped with parallel resistor for
circuit supervision
Specifications:
Max. Fluid Pressure
100PSI
Operating Temperature
-40
to +125 Degrees C
Min. Fluid Sensitivity
100Kohms-cm
Power Requirements
10
to 24VDC; 20ma. Typ. current draw
Reverse Polarity Protection
Diode
protected to 1 amp maximum reverse current
Short Circuit Protected
Short
Circuit protected for output shorted to +24 volts
Output
Open
Collector pull to ground, 30VDC max. 100 ma max cont.
Current through Fluid
Max.
at ring = 10mA AC at 1kHz, at tip 100
microA. AC at 1kHz
