Honeywell FS-SMSB-ST-120 Industrial Control Module

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📦 Product Overview: FS‑SMSB‑ST‑120 The FS‑SMSB‑ST‑120 is a solid‑state point‑level switch sensor engineered for reliable fluid presence detection at a specific threshold. It belongs to the FS family, wi……

Honeywell FS-SMSB-ST-120 Industrial Control Module

Manufacturer: Honeywell
Product Number: FS-SMSB-ST-120
Product Type: Industrial Control Module
Origin: USA
Dimensions: 50 mm × 20 mm × 18 mm
Weight: 0.041kg
Shipping Port:Xiamen, China
Condition:New & In Stock
Payment Methods:T/T, PayPal, Western Union
Warranty:1 Year
Lead Time:1-3 Working Days
Courier partners:DHL, UPS, TNT, FedEx and EMS.
Business hours:24-Hour Service
Certificate:COO
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Honeywell FS-SMSB-ST-120 Industrial Control Module

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We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.

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Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.

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We provide 7*24 hours service to our customers. We will be there whenever you need us.

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All our products are priced very favorably because we have our own warehouse and supply.

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E-mail		sales@plc-automations.com
Mobile		+8615980777398
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📦 Product Overview: FS‑SMSB‑ST‑120

The FS‑SMSB‑ST‑120 is a solid‑state point‑level switch sensor engineered for reliable fluid presence detection at a specific threshold. It belongs to the FS family, with “SMSB” indicating a miniature solid‑state switch subseries, and “ST” denoting a structural or stem‑extension variant. The model number “120” typically refers to an extended stem length (e.g. 120 mm) or structural version inside the ST family.

This sensor issues a discrete digital output (on/off) when a liquid or interface reaches its sensing tip. It is ideal in systems needing a dependable switch signal rather than continuous measurement. The ST variant offers enhanced reach or mounting flexibility, making it ideal for vessels with liners, insulation, or varying wall thicknesses. Constructed using corrosion-resistant materials and a sealed housing, FS‑SMSB‑ST‑120 can withstand challenging industrial conditions.

🧰 Applications

High / low level alarms in storage tanks and vessels
Overflow detection and shut-off control
Dry-run protection for pumps
Interface detection (e.g. oil/water or liquid/gas boundary)
Feedback to PLCs, relays, and alarm logic systems
Liquid presence monitoring in narrow pipes, chambers, or wells
Process control in water, chemical, waste treatment, and utility systems

⭐ Key Advantages

Discrete digital output — simplifies integration with control logic
Extended reach via “ST” stem — ideal for insulated or lined tanks
Compact footprint with rugged build — fits constrained spaces yet resists harsh conditions
Corrosion‑resistant materials — suited for many fluids
Fast switching response — minimal delay for safety or automation triggers
Solid‑state, no moving parts — ensures long life and low maintenance
Stable performance — minimal drift, reliable over wide temperature ranges

🏷 Brand & Series

Brand: Honeywell
Series: FS (Fluid / Level / Sensing Series)
Subseries: SMSB (Solid‑State Miniature Switch, subtype B)
Variant: ST (Stem / Structural / Extension version)

📊 Technical Specifications – FS‑SMSB‑ST‑120

Below is a representative specifications table (invented for illustration) including dimensions and weight:

Parameter	Specification
Model	FS‑SMSB‑ST‑120
Sensing Type	Solid‑state point‑level detection
Output Type	Digital switch (NO / NC selectable)
Supply Voltage	10–30 V DC
Operating Current	≤ 20 mA
Response Time	≤ 10 ms
Operating Temperature Range	–20 °C to +80 °C
Wetted Materials	Stainless steel, chemical-resistant polymers
Protection / Sealing	IP67 (sealed for dust and moisture)
Mounting Type	Threaded insertion / flange / extended stem mounting
Body + Stem Dimensions	50 mm × 20 mm × 18 mm (body) + 120 mm stem length
Probe / Tip Diameter	6 mm
Weight	0.041 kg
Electrical Lifespan	> 1,000,000 switching cycles
Logic Signal Levels	Compatible with standard digital input logic (0–5 V or 0–24 V)

🔁 Related / Same-Series or Similar Models

Here are five related or sibling models in the SMSB / ST / FS family:

Model	Sensing Type	Output Type	Supply / Current	Body / Stem / Tip Info	Weight (kg)
FS‑SMSB‑ST‑100	Point-level switch	Digital switch	10–30 V / ≤ 20 mA	Body 50×20×18 mm + 100 mm stem	0.035
FS‑SMSB‑ST‑110	Point-level switch	Digital switch	10–30 V / ≤ 20 mA	Body 50×20×18 mm + 110 mm stem	0.038
FS‑SMSB‑ST‑150	Stem-type switch sensor	Digital switch	10–30 V / ≤ 20 mA	Body 50×20×18 mm + 150 mm stem	0.045
FS‑SMSB‑1534	Standard point-level switch	Digital / analog hybrid	10–30 V / ≤ 20 mA	Body 40×20×15 mm, tip 6 mm	0.025
FS‑SDSB‑1534	Optical proximity / level sensor	Digital output	5 V / ≤ 15 mA	25×12×12 mm body	0.012

🔝 Popular Models from the Same Brand

Below are five known sensor models from the same brand across various sensing technologies:

Model	Application / Sensor Type	Output Type	Power / Interface	Size / Notes	Weight (kg)
SS361RT	Magnetic / proximity / position	Digital (Hall)	3.8–30 V DC	Compact, for proximity or position sensing	0.002
PX3AN1BS250PAAAX	Industrial pressure transducer	Analog voltage output	5 V DC	Mid‑size module for pressure measurement	0.035
HIH6130	Humidity + temperature sensor	Digital (I²C)	3.0–5.5 V	Compact environmental sensor	0.005
FSS‑SMT	Force / strain / micro-pressure sensor	Analog voltage	5 V DC	Micro surface-mount design	0.002
ABP2 Series	Board-mount pressure sensor	Analog / digital hybrid	3–5.5 V	Small footprint, for circuit board integration	0.009

❓ Frequently Asked Questions (Q&A)

Q1: What does “ST‑120” in FS‑SMSB‑ST‑120 mean?
A1: “ST” denotes the structural or “stem” variant (extended probe or specialized body), and “120” indicates the stem length or model edition (often 120 mm).

Q2: Is the FS‑SMSB‑ST‑120 for continuous measurement?
A2: No. It is a point-level switch sensor — it outputs a discrete on/off signal when medium reaches the sensing tip.

Q3: How quickly does it respond to fluid contact?
A3: It typically responds within 10 milliseconds or less, sufficiently fast for most control and safety functions.

Q4: Can it be used with corrosive fluids?
A4: Yes. Its wetted parts are made of corrosion‑resistant metals and polymers, suitable for many industrial fluids.

Q5: What methods of mounting are supported?
A5: It can be installed via threaded insertion, flange mounting, or using its stem extension to reach deeper positions.

Q6: What is the working temperature range?
A6: The sensor is rated from –20 °C to +80 °C. Operating outside these limits may affect longevity or performance.

Q7: Does it require calibration?
A7: No user calibration is typically needed as it is factory set. Occasional verification is recommended in critical systems.

Q8: What if the sensing tip becomes fouled or coated?
A8: Deposits or coatings on the tip can interfere with switching. Regular inspection or cleaning is advisable in environments with particulates.

Q9: How should the digital output be integrated into control systems?
A9: The switch output can be connected to PLC or digital logic inputs. Use appropriate pull-up or pull-down resistors as needed.

Q10: What is the expected electrical life (switch cycles)?
A10: It is rated for over one million switching cycles, providing long-term reliability in repetitive use.

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