❓ 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.