STAHL 9170/21-11-11s Explosion-proof Isolation Repeater

STAHL 9170/21-11-11s Explosion-proof Isolation Relay | Part Number: 201272
I. Basic Information
Brand: R.STAHL
Material Code Art.No: 201272
Series: ISpac Intrinsically Safe Isolation Safety Barrier / Signal Isolation Relay

 Model Segmentation Explanation (9165/26-11-11s)
9165: Product Series, 4–20mA + HART Intrinsically Safe Isolation Relay
26: Dual-channel version (2 independent 4-20mA channels)
11: Input Type 0/4–20mA HART, supports line fault detection LFD
11: Output Type 0/4–20mA Ex i Intrinsically Safe Output
s: Screw terminal wiring; same series k is spring quick-insert terminal (part number 201273)

 Core Hardware Parameters
Channel Specifications
2 channels fully isolated 4–20mA HART bidirectional transmission, electrical isolation between channels, input/output/power supply three parties
Input side: Intrinsically Safe Ex i, connected to explosion-proof area field transmitters (pressure, flow, level)
Output side: Safe area 4–20mA, directly connected to ABB BIO01/PIO01 / Analog DCS card
Compatible with HART protocol, can online debug explosion-proof area instrument parameters Power supply
Auxiliary power supply: DC24V, DC power supply inside the cabinet
Diagnostic function
Built-in LFD line fault detection: Automatic identification of open circuits and short circuits, can trigger the fault relay contacts and upload DCS alarms
Mechanical dimensions
DIN rail installation, width 17.6mm (single module narrow type), IP20 terminal protection, UL94 V0 flame retardant enclosure, net weight 190g
Explosion-proof certification
ATEX, IECEx, NEPSI, CCS shipyard certification; applicable for isolation of explosion-proof Zone 0/1 field instruments, standard for petrochemical, power plants, and offshore platforms

Isolation and Safety Advantages
Triple isolation: Field explosion-proof circuit ↔ Module power supply ↔ DCS control room circuit, blocking ground loop interference
Safety energy limitation: Limiting the voltage and current sent to the hazardous area, meeting Ex ia safety explosion-proof specifications
No truncation of HART digital signals, does not affect the online calibration of flowmeters and pressure transmitters by the operator
Short-circuit self-lock protection, single-channel failure does not affect the other signal