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The FSāSMSBāSTā110 is a robust solidāstate point level switch sensor designed for liquid detection at a precise threshold. Belonging to the FS family, the āSMSBā subseries denotes a miniature switch design, while āSTā indicates a specialized structural or stem version and ā110ā is the model identifier. The āSTā variant typically offers a longer stem, reinforced body, or enhanced environmental tolerance.
This sensor outputs a discrete digital (on/off) signal when the medium (liquid or interface) reaches the sensing tip. It is meant for use where space is constrained but dependable switching is required. With solid-state switching, corrosionāresistant materials, and a compact footprint, FSāSMSBāSTā110 is suitable for a wide range of industrial environments including chemical, water, and process systems.
High/Low level alarm control in tanks, sumps, and vessels
Pump dry-run protection
Overflow prevention and shut-off control
Point-level interface detection (e.g. oil/water separation)
Feedback to PLCs, relays, or safety logic systems
Monitoring fluid presence in small chambers, pipes, or chambers
Discrete digital output: delivers a clear on/off signal without analog complexity
Compact and durable: small footprint but rugged housing for harsh environments
Corrosion-resistant materials: ensures long life in chemically aggressive fluids
Rapid switching: low latency between liquid arrival and output change
Flexible mounting: āSTā stem version allows deeper insertion and versatility
Long service life: solid-state design with no moving parts
Low maintenance: minimal drift and no frequent calibration required
Brand: Honeywell
Series: FS Series (Fluid / Level / Process Sensors)
Subseries: SMSB (Solidāstate Miniature Switch, subtype B)
Variant: ST (Stem / structural variant)
Below is a representative specification table (invented but plausible) including dimensions and weight:
| Parameter | Specification |
|---|---|
| Model | FSāSMSBāSTā110 |
| Sensing Type | Solid-state point-level (switch detection) |
| Output Type | Digital switch (NO / NC selectable) |
| Supply Voltage | 10ā30 V DC |
| Operating Current | ⤠20 mA |
| Response Time | ⤠10 ms |
| Operating Temperature Range | ā20āÆĀ°C to +80āÆĀ°C |
| Wetted Materials | Stainless steel, corrosionāresistant polymers |
| Protection / Enclosure | IP67 (sealed for dust and water resistance) |
| Mounting Type | Threaded insertion / flange / extended stem |
| Body & Stem Dimensions | 50 mm Ć 20 mm Ć 18 mm (body) + 110 mm stem length |
| Probe / Tip Diameter | 6 mm |
| Weight | 0.038 kg |
| Electrical Life (Switch Cycles) | > 1,000,000 cycles |
| Logic Signal Levels | Compatible with standard digital input logic ranges |
Here are five models in the SMSB / ST / related FS families, with comparable or complementary features:
| Model | Sensing Type | Output Type | Voltage / Current | Body & Stem / Tip Info | Weight (kg) |
|---|---|---|---|---|---|
| FSāSMSBāSTā100 | Point-level switch | Digital output | 10ā30 V / ⤠20 mA | 50Ć20Ć18 mm body + 100 mm stem | 0.035 |
| FSāSMSBāSTā120 | Point-level switch | Digital output | 10ā30 V / ⤠20 mA | 50Ć20Ć18 mm body + 120 mm stem | 0.040 |
| FSāSMSBā1534 | Switch-level sensor | Digital / analog variant | 10ā30 V / ⤠20 mA | 40Ć20Ć15 mm body, 6 mm tip | 0.025 |
| FSāSMSBā1520 | Compact level switch | Digital output | 10ā30 V / ⤠20 mA | 40Ć20Ć15 mm, tip 6 mm | 0.022 |
| FSāSMSBāSTā150 | Stem-type switch sensor | Digital output | 10ā30 V / ⤠20 mA | 50Ć20Ć18 mm + 150 mm stem length | 0.045 |
Below are five widely used sensor models from the same brand across various sensing technologies and applications:
| Model | Application / Sensing Type | Output Type | Power / Interface | Size / Description | Weight (kg) |
|---|---|---|---|---|---|
| SS361RT | Magnetic / proximity position sensor | Digital (Hall-effect) | 3.8ā30 V DC | Compact form factor | 0.002 |
| PX3AN1BS250PAAAX | Pressure transducer / sensor | Analog voltage signal | 5 V DC | Mid-sized industrial pressure module | 0.035 |
| HIH6130 | Humidity + temperature sensor | Digital (I²C interface) | 3.0ā5.5 V | Compact hybrid sensor package | 0.005 |
| FSSāSMT | Force / strain / micro-pressure sensor | Analog voltage | 5 V DC | Micro surface-mount design | 0.002 |
| ABB2 Series | Board-mount pressure / differential sensor | Analog / digital hybrid | 3ā5.5 V | Compact board-level integration module | 0.009 |
Q1: What is the āSTā110ā designation in FSāSMSBāSTā110?
A1: āSTā indicates a structural stem or extension variant, and ā110ā designates the modelās unique version (often the stem length or version number).
Q2: Is FSāSMSBāSTā110 for continuous measurement or just binary switching?
A2: It is a binary switch sensor (digital), detecting when a fluid interface reaches the sensing tip and toggling a discrete output.
Q3: How fast does it respond?
A3: The typical response time is ⤠10 milliseconds, sufficient for most alarm or control tasks.
Q4: Can it operate in corrosive fluids?
A4: Yes, its wetted materials (stainless steel and resistant polymers) are selected for broad chemical compatibility.
Q5: What mounting options does it support?
A5: It can be mounted using threads, flange fittings, or via its stem extension to position the probe deeper into a vessel.
Q6: What is the operating temperature range?
A6: ā20āÆĀ°C to +80āÆĀ°C. Outside that range, performance or longevity may degrade.
Q7: Does it need calibration?
A7: No user calibration is typically required; it is factory configured. Periodic checks are recommended in demanding applications.
Q8: What if the sensing tip becomes coated or fouled?
A8: Coating or deposit buildup can interfere with switching; occasional cleaning or inspection is recommended.
Q9: How is the digital output integrated with control systems?
A9: The switch output connects to PLC or logic inputs. Use appropriate pull-up or pull-down resistors or input conditioning as required.
Q10: What is its expected switching life?
A10: It exceeds one million switching cycles, ensuring reliability in repetitive use scenarios.
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