(Detailed Parameters/Specifications)
Category Parameter Specification for Model ALF111-S00
General Manufacturer Yokogawa Electric Corporation
Model ALF111-S00
Type Zener Safety Barrier (Non-isolating)
Approval ATEX, IECEx, NEPSI (Standard for intrinsic safety)
Isolation None (Passive, non-isolating)
Mounting DIN Rail Mount (35mm standard)
Input (Field Side - Hazardous Area) Device Type Thermocouple (T/C)
Intrinsic Safety (IS) Parameters Ui = 8V, Ii = 55mA, Pi = 0.1W, Ci = 5μF, Li = 10mH
(Defines the maximum energy allowed into hazardous area)
Internal Resistance Approx. 15 Ω (This is a critical parameter for signal accuracy)
Output (System Side - Safe Area) Signal Type Pass-through of thermocouple mV signal
Compatible Instruments DCS/PLC/Recorder T/C input card (must have high input impedance)
Power Supply Requirement None (Passive Device). Requires a certified IS power supply for the loop if used with a transmitter.
For direct T/C connection, no power is needed.
Performance System Accuracy Impact The barrier's internal resistance can cause a measurement error if the input impedance of the receiving device is not sufficiently high.
Operating Temperature -20 to +70°C