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YOKOGAWA STLD-301*E/MTS/PA
Product Overview:
The STLD-301*E/MTS/PA is a 2-wire, loop-powered smart temperature transmitter from Yokogawa’s STLD300 series. It supports thermocouple (TC) and resistance temperature detector (RTD) sensors with Multi-Sensor Technology (MTS) allowing field reconfiguration between sensor types. The suffix breakdown: *E = HART 7 communication, MTS = Multi-Sensor Technology, PA = Intrinsically Safe (Ex ia IIC T4 Ga).
Detailed content
Technical Specifications:
| Parameter | Value |
|---|---|
| Input Type | Pt100 (JIS), Pt1000 (JIS), Cu50, JPt100, Type K, J, T, E, R, S, B, N thermocouples |
| Output | 4-20 mA DC (2-wire) + HART 7 |
| Accuracy | ±0.1% of span (RTD), ±0.2°C (TC) |
| Process Alarm (PA) | 2 alarm points (HH/LL), SPDT relay contact |
| Power Supply | 12-45 V DC (2-wire loop powered) |
| Ambient Temperature | -40°C to +85°C |
| Process Temperature | -200°C to +850°C (depends on sensor type) |
| Process Pressure | Up to 32 MPa (with appropriate process connection) |
| Protection Rating | IP65 / IP67 (NEMA 4X) |
| Ex Rating | Ex ia IIC T6 Ga / Ex d IIC T6 Gb |
| Communication | HART 7, FOUNDATION Fieldbus H1 (optional) |
| Response Time | ≤ 0.5 seconds (τ63%) |
| SIL Rating | SIL 2 (per IEC 61508) |
Material Composition:
- Housing: Aluminum alloy (die-cast) with epoxy coating
- Process Connection: SUS316L stainless steel
- Terminal Block: Glass-filled PBT
- Gasket: Viton (standard), EPDM (optional)
Advantages:
- High accuracy of ±0.1% for RTD inputs
- Built-in process alarm eliminates need for separate alarm unit
- HART communication enables remote configuration and diagnostics
- SIL 2 certified for safety-critical applications
- Wide input type flexibility from a single transmitter
Applicable Industries:
Refining, chemical processing, power plants, HVAC, food processing, pharmaceutical, pulp and paper, steel manufacturing
Installation Requirements:
- Mount the transmitter with the process connection pointing downward for liquid services
- Use a thermowell for high-pressure or high-velocity applications
- Ensure thermowell immersion depth is sufficient (minimum 5× thermowell diameter)
- For TC inputs, use correct extension wire type (K-type for Type K, etc.)
- Shield all input wiring and ground at one end only
Usage Notes:
- Perform sensor calibration at the transmitter using HART communicator
- Set alarm deadband to prevent relay oscillation at the setpoint
- Verify loop power supply voltage exceeds minimum operating voltage (12 V DC) plus voltage drop across loop resistance
- For Pt100 3-wire connections, ensure all three leads are the same length and material
