Technical Specifications
Category Parameter Specification
General Model UT155-AN
Type Intrinsically Safe Isolator (Repeater Type)
Mounting DIN rail mount in Yokogawa UTSX Series housing
Input (Field Side - Hazardous Area) Signal 4-20 mA DC (from active device, e.g., 4-wire transmitter)
Input Impedance Approx. 50 Ω
Intrinsic Safety Parameters Ui ≈ 28 V DC, Ii ≈ 93 mA (compliant with ATEX/IECEx)
Output (System Side - Safe Area) Signal 4-20 mA DC
Load Resistance 0-750 Ω
Accuracy ±0.1% of span
Power Supply Voltage 20.4-31.2 V DC (supplied to UTSX housing)
Consumption Approx. 1.2 W (at 24 V DC)
Isolation Between Input/Output/Power 1500 V AC
Performance Accuracy ±0.1% of span
Temperature Drift ±0.015% of span per °C
Response Time < 150 ms
Environment Operating Temperature -20°C to +60°C
Humidity 10-90% RH (non-condensing)
Key Features
Repeater Function: Accepts signals from externally powered field devices (4-wire transmitters).

Intrinsic Safety: Complies with ATEX/IECEx standards for hazardous areas (Zone 0/1).

Signal Isolation: 1500 V AC isolation between input, output, and power supply.

High Accuracy: ±0.1% span accuracy ensures precise signal transmission.

Compact Design: DIN rail mounting for high-density installation.

Applications
Interfacing 4-wire transmitters or other active devices in hazardous areas with control systems.

Process industries (oil/gas, chemicals, pharmaceuticals) requiring signal isolation and safety.

Monitoring systems where field devices have independent power sources.