Fluid Level Sensors

Standex Electronics custom and standard reed switch based fluid level sensors are available in a variety of configurations for a multitude of applications. Standex LS100, 200 and 300 series conductivity based fluid level sensors are a comprehensive line of fluid level sensors that can be applied in most any application where conductivity based sensors are appropriate. From the 'bare bones' LS100 series sensors, which must be driven from external electronics to the' turn key' LS300 series sensors that have a switched output, Standex sensors are engineered as needed to meet customer requirements.

Reed switch based fluid level sensors are used in a large variety of liquid level applications
LS200 and 300 series sensors are equipped with a Standex patented “bias ring”, designed to eliminate the issues of sensitivity changes that can occur due to a buildup of conductive material around the sensor which can cause substantial shifts in sensor sensitivity. The Standex “bias ring” is charged with an opposing electrical polarity and eliminates secondary conductive paths, which can cause “false full” indications.
Typical LS applications include monitoring of soap levels in clothes washers and sensing food syrup levels in dispensing equipment
LS sensors may be used for basement flood water or the backup of fixed or mobile septic systems due to the ability of this technology to operate in conductive fluids with high particulate matter and large amounts of residue
Reed switch or LS sensors may be used for automotive applications for monitoring windshield washer fluid and coolant levels.
Standex sensors can be mounted with a seal grommet, spin welded or hot plate bonded onto plastic containers, or screw threaded to the container
Standex conductivity sensors may be operated by a DC Voltage, DC Current or user electronics.

Sensors Catalog

Data Sheet

Download load the entire Standex Electronics catalog of fluid level and proximity sensors

R12431 Series

For blow or injection molded bottles
Side mount design uses separate seal grommet
Form A (normally open) and Form B (normally closed) operation
Switch rated 0.5A/100V/10VA max
Internal snubber resistor
Connector meets requirements of Packard part number12162289
Contact Standex Electronics for more information on this or to discuss your specific requirement

R12449 Series

For blow or injection molded bottles
Side mount design uses separate seal grommet
Form A (normally open) and Form B (normally closed) operation
Switch rated 0.5A/100V/10VA max
Internal snubber resistor
Mates with Toyota connector P/N 90980-11068
Contact Standex Electronics for more information on this or to discuss your specific requirement

R12456 Series

For blow or injection molded bottles
Side mount design uses separate seal grommet
Form A (normally open) and Form B (normally closed) operation
Switch rated 0.5A/100V/10VA max
Internal snubber resistor
Mates with Yazaki 7283-6434-40
Contact Standex Electronics for more information on this or to discuss your specific requirement

R12347 Series

For blow or injection molded bottles
Bottom mount design
Form A (normally open) and Form B (normally closed) operation
Switch rated 0.5A/100V/10VA max
Internal snubber resistor
Mates with Ford E57B14A464AA
Contact Standex Electronics for more information on this or to discuss your specific requirement

R12349 Series

For blow or injection molded bottles
Side mount design
Form A (normally open) and Form B (normally closed) operation
Switch rated 0.5A/100V/10VA max
Internal snubber resistor
Mates with Ford E57B14A464AA
Contact Standex Electronics for more information on this or to discuss your specific requirement

R12072 Series

For blow or injection molded bottles
Top mount/ snap in design
Form A (normally open) operation
Switch rated 1.5A/200V/50VA max
Adjustable sensing point up to 18 inches from top of bottle
Standard termination-0.25 inch open spade
Contact Standex Electronics for more information on this or to discuss your specific requirement

R12372 Series

For blow or injection molded bottles
Indication delay feature
Bottom mount design uses separate seal grommet
Form A (normally open) and Form B (normally closed) operation
Switch rated 1.5A/200V/50VA max
Contact Standex Electronics for more information on this or to discuss your specific requirement

R12421 Series

For blow or injection molded bottles
Indication delay feature
Bottom mount design uses separate seal grommet
Form A (normally open) and Form B (normally closed) operation
Switch rated 1.5A/200V/50VA max
Contact Standex Electronics for more information on this or to discuss your specific requirement

R12406 Series

For blow or injection molded bottles
Indication delay feature
Bottom mount design with power harness
Form A (normally open) and Form B (normally
closed) operation
Switch rated 1.5A/200V/50VA max
Contact Standex Electronics for more information on this or to discuss your specific requirement

LS100 Series

Passive device with no internal electronics
Driven from external electronics
Suitable for most conductive fluids with minimal particulate matter
May be operated from user’s electronics in a “pulsing” mode to reduce electrolysis
May be operated with a bipolar pulsing current from user electronics, eliminating electrolysis
Contact Standex Electronics for more information on this or to discuss your specific requirement

LS200 Series

False Full Protection and current level shift to indicate fluid level
Available as a two-wire device
Capable of substantial miniaturization
Equipped with Standex patented “bias ring” concept
Suitable for most conductive fluids
Suitable in fluids with substantial particulate matter
Operated by a DC current pulse supplied from user’s electronics; current draw indicates fluid level
Optional LED available for local fluid level indication
Contact Standex Electronics for more information on this or to discuss your specific requirement

LS300 Series

Sensitivity Shift / False Full Protection
Full electronics and substantial probe miniaturization
Equipped with Standex patented “bias ring” concept
Available as a three-wire device
Suitable for most conductive fluids
Suitable in fluids with substantial particulate matter
Internal electronics used to eliminate electrolysis
Input is 9V to 30 V DC
Provided with a switched output; 30 volt open collector sync, TTL or CMOS
Optional LED available for local fluid level indication
Contact Standex Electronics for more information on this or to discuss your specific requirement

R12468 Series

External sensor for injection molded bottles
Form A or Form B operation with separate float
Bottom mount with o-ring seal
Switch rated 1.5A /200V/50VA max
Mates with Packard P/N 12052641
Contact Standex Electronics for more information on this or to discuss your specific requirement

B12469 Series

Float / magnet assembly operates with R12468 sensor assembly
Float locates in the bottle assembly
Foamed Polypropylene Plastic
Specific gravity per application
Contact Standex Electronics for more information on this or to discuss your specific requirement

R12481 Series

External sensor for injection molded bottles
Form A or Form B operation with separate float
Bottom mount with o-ring seal
Switch rated 0.5A/100V/10VA max
Mates with Packard P/N 12052641
Contact Standex Electronics for more information on this or to discuss your specific requirement

B12482 Series

Float / magnet assembly operates with R12481 sensor assembly
Float locates in bottle assembly
Foamed Polypropylene Plastic
Specific gravity per application
Contact Standex Electronics for more information on this or to discuss your specific requirement

R11774 Series

External sensor for injection molded bottles
Form A (normally open) operation with
separate float
Switch rated 0.5A/100V/10VA max
Snap lock mounting
Integral connector
Contact Standex Electronics for more information on this or to discuss your specific requirement

R12180 Series

External sensor for injection molded bottles
Form A (normally open) operation with
separate float
Switch rated 0.5A/100V/10VA max
Snap lock mounting
Integral connector
Contact Standex Electronics for more information on this or to discuss your specific requirement

B12450 Series Float

Float / magnet assembly operates with
R11774 and R12180 series sensors
Float locates in bottle assembly
Foamed PP
Operates with fluid SG at 0.79 min
Contact Standex Electronics for more information on this or to discuss your specific requirement

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