Description
Stahl 947022-16-11
Technical Specifications Intrinsic safety explosion-proof certification; galvanic isolation; 4-20mA analog output signal; energy limiting protection circuit; support for intrinsically safe valve positioners; DIN rail mounting.
Functional Features Receives analog control signals from the control system I/O modules. Outputs limited-energy 4-20mA control signals to field intrinsically safe actuators and valve positioners. Blocks dangerous energy from entering the hazardous explosive atmosphere. Isolates ground potential difference between control cabinet and field hazardous circuits.
Application Scenarios Chemical process valve control, oil and gas pipeline regulating valve drive and other analog control applications in gas and dust hazardous explosion zones.
Performance Parameters High analog signal linearity; low signal drift under temperature change; reliable energy limiting protection; stable isolation performance.
Material Composition Housing uses flame-retardant explosion-proof thermoplastic; internal isolation and protection components meet intrinsic safety standards; printed circuit board is FR-4 flame-retardant material; terminal parts are nickel-plated anti-corrosion alloy.
Structural Characteristics DIN rail mount thin rectangular housing; separated terminal regions for control room input and hazardous field output; function marking printed on the housing surface; integrated DIN rail buckle on the back.
Working Principle Analog control signals from the control room enter the safe side of the barrier. The isolation circuit transfers the analog signal value to the field side while the energy limiting circuit continuously caps the maximum voltage and current delivered to the hazardous zone. The output signal drives intrinsically safe field actuators.
Installation Requirements Install the barrier inside non-hazardous control cabinets. Keep field hazardous wiring separated from safe side wiring. Perform grounding in accordance with intrinsic safety installation specifications. Confirm compatibility with field intrinsically safe valve positioners.
Precautions for Use Operate only within the explosion-proof certificate parameter range. Do not bypass internal energy limiting circuits. Do not connect non-intrinsically safe equipment to field side terminals.
