Kele T91U-3 Platinum RTD Temperature Transmitter (1000 Ohm, 4–20 mA)

The Kele T91U-3 is a high-accuracy, rangeable temperature transmitter designed for HVAC, industrial, and building automation applications. It utilizes a 1000 ohm platinum RTD (α = 0.00375) to deliver precise and stable temperature measurements. This model provides a loop-powered 4–20 mA output, ensuring reliable signal transmission over long distances with minimal interference.

Built for flexibility, the T91U series allows adjustable zero and span settings, making it adaptable to a wide range of temperature monitoring requirements. An optional LCD display (XTD) is available for local temperature indication, housed in a NEMA 4 / IP65 enclosure for added environmental protection.

Key Features

• High-accuracy platinum RTD transmitter
• 1000Ω platinum RTD sensor, TCR 0.00375 Ω/Ω/°C
• Loop-powered 4–20 mA output, two-wire design
• Wide, adjustable temperature ranges
• Optional 3½-digit LCD display (XTD option)
• Compact, lightweight, and rugged design
• Suitable for HVAC and industrial temperature monitoring

Specifications

• Brand: Kele
• Model / Part Number: T91U-3
• SKU: T91U-3
• Sensor Type: 1000Ω Platinum RTD
• Supply Voltage: 10.5–45 VDC
• Accuracy: ±0.1°C or ±0.2% of span (whichever is greater)
• Signal Output: 4–20 mA @ 675Ω (375Ω with display)
• Zero Range (T91U): -30° to 210°F (-34° to 98.9°C)
• Minimum Span: 40°F (22°C)
• Usable Temperature Range: -30° to 250°F (-34.4° to 121.1°C)
• Operating Temperature: 0° to 140°F (-18° to 60°C)
• Operating Humidity: 0–95% non-condensing
• Weight: 0.16 lb (0.07 kg) without options

Compliance

• CE Approved: EN50081-1, EN50082-1
• Optional Industrial RF/EM Hardened CE compliance (EN50081-2, EN50082-2)

The Kele T91U-3 is an excellent choice when accuracy, reliability, and configurability are critical for temperature measurement and control systems.