The Rotork YT-3100 series is presented by Rotork as a reliable and precise smart positioner for linear and quarter-turn rotary actuators, with single-acting and double-acting configurations available. It is designed to be practical in the field: compact construction, a clear menu navigated by four push buttons, NE107-rated visual diagnostics for simplified troubleshooting, and optional 4–20 mA analogue feedback to complete the control package.
Your requested model, YT-3100RSZ2111S, is a rotary configuration aimed at applications that require intrinsically safe (CCC) selection, with installation-friendly connection standards and a wide ambient temperature rating.
1) What the model code “YT-3100RSZ2111S” indicates
Rotork’s YT-3100 code table defines the structure: Model → Motion type → Acting type → Explosion protection → Lever type → Conduit & air connection → Gauge block → Options → Operating temperature.
Based on that published structure, the intended meaning of the key segments in your code is:
| Segment |
Value |
Catalog meaning |
Practical implication |
| Series |
YT-3100 |
Aluminium housing with polycarbonate cover |
Compact industrial enclosure |
| Motion type |
R |
Rotary |
Quarter-turn actuator applications |
| Acting type |
S |
Single |
Common for spring-return fail-safe actuators |
| Explosion protection |
Z |
Intrinsically safe (CCC) |
CCC intrinsically safe configuration route |
About the “2” after Z (important procurement note): the same Rotork code table lists rotary lever type = “5 = NAMUR”. In many rotary YT-3100 codes, you’ll see “…R…5…” to explicitly specify NAMUR mounting. Your string shows “…Z2…”, which does not match the rotary lever digit shown in the table. That can happen if (a) the code was copied with one digit missing, or (b) some sellers compress/omit the lever digit and start directly with the connection digit. The safest move is simple: confirm the exact order code on the device nameplate before finalizing brackets/mounting kits. The platform specifications and the Z (CCC IS) meaning still stand.
2) Core platform specifications (YT-3100 series)
The YT-3100 datasheet publishes the following key electrical, pneumatic, and performance figures.
| Parameter |
Published specification |
| Input signal |
4–20 mA DC |
| Supply pressure |
0.14 to 0.7 MPa (1.4 to 7 bar / 20 to 102 psi) |
| Stroke capability (platform) |
Rotary: 55 to 110°; Linear: 10 to 150 mm |
| Maximum loop load |
500 Ω at 20 mA DC |
| Ingress protection |
IP66 |
| Performance |
Linearity ±0.5% F.S.; Hysteresis ±0.5% F.S.; Sensitivity ±0.2% F.S.; Repeatability ±0.3% F.S. |
| Pneumatic consumption / capacity |
< 2 LPM @ 0.14 MPa; Flow capacity 70 LPM @ 0.14 MPa |
| Output characteristics |
Linear, EQ%, quick open, user set |
| Operating temperature (S) |
−30 to +85 °C (−22 to +185 °F) |
| Weight |
1.7 kg (3.7 lb) |
These numbers matter because they describe the practical boundary of control quality. Hysteresis and repeatability are what determine whether the valve will “creep smoothly” or “jump and stick.” Flow capacity and supply range define how much pneumatic authority the positioner can deliver to overcome torque spikes and disturbances.
3) “Smart” functions that change day-to-day commissioning
Rotork highlights several design features of the YT-3100 that focus on usability and troubleshooting speed: compact design, gauge manifold concept, push-button menu navigation, NE107-rated visual self-diagnostics, and optional analogue output (4–20 mA feedback).
| Smart feature |
What it helps you achieve |
| Push-button menu (four keys) |
Faster setup and tuning without external handheld tools |
| Visual self-diagnostics (NE107) |
Clearer fault isolation and more standardized maintenance workflow |
| Analogue output / feedback option |
Remote position monitoring and deviation trending in the DCS/PLC |
| Compact mechanical layout |
Easier mounting on tight actuator assemblies and skids |
A practical point: position feedback is often the difference between “the valve seems weird” and “we can prove what’s wrong.” Comparing command vs. feedback over time makes friction growth, linkage looseness, or air problems visible before they become downtime.
4) CCC intrinsically safe (“Z”) selection and what it implies
In the YT-3100 code table, Z is defined as “intrinsically safe CCC.” Intrinsic safety is a system-level strategy, not just a label on the device. It typically involves barriers/isolators, wiring rules, and documentation aligned to site classification requirements. Choosing the Z variant helps ensure your valve station design starts on the correct compliance track rather than requiring late-stage rework.
The datasheet also references hazardous-area marking context (Ex ia IIC T5/T6) and ambient temperature limits tied to temperature classes, which are part of how intrinsically safe products are commonly documented.
| Hazardous-area engineering topic |
Why it matters |
How Z configuration helps |
| Consistent hazardous-area strategy |
Avoids mixing protection concepts across valve stations |
Order code explicitly reflects CCC IS intent |
| Loop design discipline |
IS compliance depends on barriers + wiring + device |
Encourages proper barrier/isolator selection and documentation flow |
| Spares standardization |
Reduces “special case” maintenance |
Same device family used across similar classified locations |
5) Typical applications for a rotary, single-acting, CCC IS smart positioner
Rotary positioners are commonly selected for quarter-turn valves where stable modulating control is required, and single-acting is often chosen to guarantee a defined fail position.
| Application area |
Typical valve duties |
| Process skids in classified zones |
Modulating control on ball/butterfly valves with predictable fail action |
| Utilities and fuel gas systems |
Pressure/flow regulation with strong safety emphasis |
| Chemical processing (solvents, hydrocarbons) |
Quarter-turn control where hazardous-area requirements are common |
| Water and wastewater in mixed environments |
Robust rotary control with simplified maintenance workflows |
Rotork positions the YT-3100 family broadly across actuator types and process industries, with emphasis on finding an optimized solution and offering local hazardous-area approvals.
6) Installation and commissioning checklist (rotary-focused)
A smart positioner can correct for many realities, but it cannot defeat bad air, poor mounting, or mismatched travel.
| Checkpoint |
What to verify |
Why it matters |
| Mounting standard |
Confirm whether this unit is NAMUR rotary mounting (the table lists rotary lever type “5”) |
Prevents bracket mismatch and calibration trouble |
| Actuator action |
Confirm spring-return direction and fail position |
Ensures correct safety behavior |
| Pneumatic quality |
Clean, dry air within 0.14–0.7 MPa |
Stabilizes response, reduces drift, improves repeatability |
| Electrical loop |
Total loop resistance ≤ 500 Ω at 20 mA |
Maintains command accuracy and stable operation |
| Feedback integration |
Wire and scale 4–20 mA feedback where used |
Enables monitoring, trending, and faster troubleshooting |
Conclusion
Rotork YT-3100RSZ2111S is a YT-3100 series rotary smart positioner intended for single-acting quarter-turn actuator applications with a CCC intrinsically safe (Z) configuration path. The YT-3100 platform is defined by a 4–20 mA input, wide supply pressure range, IP66 protection, published control performance metrics, selectable response characteristics, and commissioning-oriented features such as push-button menu navigation and NE107-rated diagnostics.
One procurement-critical detail is the mid-string digit after “Z”: Rotork’s published table shows rotary lever type = 5 (NAMUR), so it’s worth verifying the exact nameplate order code and intended mounting kit before installation.
