Honeywell POS287413 Liquid Level Sensor - Equivalent & Substitute Parts

Part Overview

The Honeywell POS287413 is a bracket-mounted liquid level sensor with PNP output configuration, designed for industrial level detection applications. This sensor features stainless steel housing and prism construction, operating across a temperature range of -25°C to 140°C with a voltage rating of 12 to 28V DC.

The POS287413 is classified as an obsolete product. Identifying equivalent substitute parts is necessary to maintain system continuity, ensure procurement availability, and support ongoing maintenance and replacement requirements for existing installations.

Substiute Parts

POS287413

Honeywell Sensing and Productivity SolutionsIn Stock: 799POS287413 Datasheet

Current PartRFQ

SQ4-A21-P

Panasonic Industrial Automation SalesIn Stock: 1036SQ4-A21-P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the POS287413 is determined by the following critical parameters:

Core Functional Parameters:

• Output Configuration: PNP (required match)
• Sensor Type: Liquid level detection (required match)
• Mounting Type: Bracket Mount (required match)

Electrical Compatibility Parameters:

• Voltage Rating: Must support the operating voltage range of the original circuit
• Current Rating: Must accommodate the load requirements of the connected circuit
• Output Type: PNP configuration ensures compatible signal logic

Environmental & Material Parameters:

• Operating Temperature Range: Must encompass or exceed the application's thermal requirements
• Housing Material: Determines chemical resistance and durability in specific media

Regulatory Parameters:

• RoHS Compliance: Ensures regulatory alignment for new component procurement

The substitute part SQ4-A21-P from Panasonic Industrial Automation Sales shares the core functional parameters (PNP output, liquid level detection, bracket mount configuration) and maintains regulatory compliance. However, differences in operating temperature range, voltage rating, and housing material must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution Consideration:

The SQ4-A21-P qualifies as a functional substitute for the POS287413 based on matching output configuration (PNP), sensor type (liquid level), and mounting method (bracket mount). Both components maintain RoHS compliance, with the SQ4-A21-P offering the advantage of active product status and current manufacturing availability.

Critical Evaluation Points:

1. Voltage Rating Limitation: The SQ4-A21-P voltage rating (12 to 24V DC) does not encompass the full range of the POS287413 (12 to 28V DC). Applications operating at 25V or higher require verification that the SQ4-A21-P is suitable, or alternative substitutes must be identified.

2. Operating Temperature Range: The SQ4-A21-P operating range (-10°C to 55°C) is significantly narrower than the POS287413 (-25°C to 140°C). Applications requiring operation below -10°C or above 55°C cannot use this substitute.

3. Housing Material Difference: The POS287413 uses stainless steel construction, while the SQ4-A21-P uses polypropylene. This material difference affects chemical compatibility and durability in corrosive or high-temperature environments. Application-specific media compatibility must be confirmed.

4. Current Rating: The SQ4-A21-P current rating is not specified in available data. Circuit load requirements must be verified against manufacturer specifications before implementation.

Substitution Feasibility:

The SQ4-A21-P is suitable as a substitute only when all of the following conditions are met:

• Operating voltage does not exceed 24V DC
• Operating temperature remains within -10°C to 55°C
• Polypropylene housing is chemically compatible with the application medium
• Current requirements are confirmed within SQ4-A21-P specifications

Frequently Asked Questions (FAQ)

Q1: Why is the POS287413 listed as obsolete?

A: The POS287413 has reached end-of-life status in Honeywell's product portfolio. Obsolete designation indicates that the manufacturer no longer produces this component. Existing inventory may be available through authorized distributors, but long-term procurement cannot be guaranteed. Identifying active substitute parts ensures system sustainability.

Q2: Can the SQ4-A21-P directly replace the POS287413 in all applications?

A: No. While both sensors share the same output configuration (PNP) and mounting type (bracket mount), critical differences exist in voltage rating, operating temperature range, and housing material. Substitution is only valid when the application requirements fall within the SQ4-A21-P specifications for all parameters.

Q3: What is the significance of the voltage rating difference?

A: The POS287413 supports 12 to 28V DC operation, while the SQ4-A21-P supports 12 to 24V DC. If your circuit operates at 25V, 26V, 27V, or 28V, the SQ4-A21-P will not function correctly. Verify your system voltage before selecting this substitute.

Q4: How does the operating temperature range affect substitution?

A: The POS287413 operates from -25°C to 140°C, while the SQ4-A21-P operates from -10°C to 55°C. If your application requires operation outside the SQ4-A21-P range, this substitute is not suitable. Confirm your application's minimum and maximum operating temperatures.

Q5: Why is housing material important for substitution?

A: Housing material determines chemical resistance and durability. The POS287413 stainless steel construction resists corrosion in harsh chemical environments and maintains integrity at high temperatures. The SQ4-A21-P polypropylene construction is suitable for less aggressive environments. Verify that polypropylene is compatible with the liquid or vapor your sensor contacts.

Q6: What does PNP output configuration mean?

A: PNP (Positive-Negative-Positive) is a transistor output configuration where the output signal is active high (pulled to positive voltage) when the sensor detects the target condition. Both the POS287413 and SQ4-A21-P use PNP output, ensuring compatible signal logic with PNP-input controllers.

Q7: What is bracket mount configuration?

A: Bracket mount refers to the physical installation method where the sensor is secured to equipment using a mounting bracket. Both the POS287413 and SQ4-A21-P use this mounting type, indicating compatible installation procedures.

Q8: How should I verify current rating compatibility?

A: Determine the maximum current your circuit will draw from the sensor output. Consult your controller or PLC documentation for the input current specification. Confirm that the SQ4-A21-P current rating (to be obtained from Panasonic specifications) meets or exceeds this requirement.

Q9: What does RoHS compliance mean?

A: RoHS (Restriction of Hazardous Substances) compliance indicates that the component does not contain restricted materials such as lead, mercury, or cadmium. Both the POS287413 and SQ4-A21-P are RoHS compliant, meeting environmental and regulatory standards for industrial equipment.

Q10: Are there other substitute options for the POS287413?

A: The provided substitute list includes only the SQ4-A21-P. Additional equivalent parts may exist from other manufacturers. Consult with authorized distributors or component suppliers for comprehensive substitute options that match your specific application requirements.