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UT155-VN

The Yokogawa UT155-VN is a repeater-type safety isolator. It is the preferred choice when the field device in the hazardous area has its own separate power source (4-wire configuration). Its role is to safely pass through and isolate the signal while maintaining the integrity of the intrinsic safety barrier.

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Technical Parameters / Specifications
Category Parameter Specification
General Model UT155-VN
Type Single-channel Intrinsically Safe Isolator (Repeater Type)
Mounting DIN rail mount inside a Yokogawa UTSX Series housing
Input (Field Side - Hazardous Area) Signal 4 to 20 mA DC (from an active, externally powered device)
Input Resistance 50 Ω (typical internal burden)
Maximum Open Voltage (Ui) ~28 V DC (Energy-limited for safety)
Maximum Short Current (Ii) ~93 mA (Energy-limited for safety)
Output (System Side - Safe Area) Signal 4 to 20 mA DC
Load Resistance 0 to 750 Ω
Power Supply 20.4 to 31.2 V DC (Supplied to the UTSX housing)
Performance Accuracy ±0.1% of span
Temperature Drift ±0.015% of span per °C
Response Time < 150 ms
Isolation 1500 V AC between Input-Output-Power
Safety Approvals Intrinsic Safety Certified per ATEX, IECEx, NEPSI, and other international standards. (Specific approval codes must be verified per unit.)
Environment Operating Temperature -20°C to +60°C
Storage Temperature -40°C to +80°C
Humidity 10 to 90% RH (non-condensing)