Product Description

The Honeywell STT25H is a microprocessor-based smart temperature transmitter designed for precise temperature measurement in industrial applications. It accepts a wide variety of sensor inputs, including thermocouples, RTDs, and direct millivolt or ohm signals. The transmitter provides a 2-wire 4–20 mA analog output and supports the HART® communication protocol, enabling digital communication for configuration and diagnostics. With features like lead wire compensation, cold junction compensation for thermocouples, and open circuit sensor analysis, the STT25H ensures accurate and reliable performance. Its compact design allows for various mounting options, including direct sensor head, wall, pipe, and DIN rail mounting, making it versatile for different installation requirements.

Technical Specifications

• Model: STT25H
• Type: Smart Temperature Transmitter
• Sensor Inputs: Thermocouples, RTDs (Pt100, Pt200), mV, Ohms
• Output Signal: 2-wire 4–20 mA analog
• Communication Protocol: HART®
• Power Supply: 11–35 VDC
• Accuracy: ±0.1% of span
• Sensor Lead Wire Compensation: Yes
• Cold Junction Compensation: Yes (for thermocouples)
• Open Circuit Sensor Analysis: Yes
• Mounting Options: Direct sensor head, wall, pipe, DIN rail
• Enclosure Materials: Plastic, Aluminum, 316 Stainless Steel, Cast Iron
• Ingress Protection: IP65/IP67
• Operating Temperature Range: -40°C to +85°C
• Weight: Approximately 0.5 kg