The GST DC-9102(IS) Intrinsically Safe Conventional Photoelectric Smoke Detector (Product No. 10105034) is engineered for deployment within hazardous industrial environments classified as Zone 1 and Zone 2 under explosion-proof standard Ex ib IIC T6 Gb (Certificate CE16.2158). Integrating this conventional point-type optical smoke detector into industrial fire alarm infrastructures requires adherence to its mounting base specifications, intrinsically safe barrier electrical parameters, addressable interface modules, and field cabling transmission limits.
Detector Base and Physical Mounting Compatibility
The DC-9102(IS) smoke detector mounts onto the dedicated GST DB-01(IS) Detector Base (Product No. 30205765). The DB-01(IS) base provides an installation hole pitch ranging from 45 mm to 75 mm, allowing direct fitment to standard backboxes and industrial junction enclosures. Complete mechanical and electrical connection is managed through a designated four-terminal block:
- Terminal 1: Detection zone positive input (IN)
- Terminal 2: Detection zone positive output (OUT)
- Terminal 3: Detection zone negative common (shared IN and OUT)
- Terminal 4: Physical fix and mechanical retention only (no electrical function)
Intrinsically Safe Zener Barrier Electrical Entity Parameters
When protecting hazardous areas in petroleum plants, chemical processing facilities, or marine vessels, the non-addressable DC-9102(IS) must be isolated from the safe area using an approved intrinsically safe Zener barrier. Field installation circuits must match the certified intrinsic safety entity ratings:
- Maximum Output Voltage (Uo): 28 V
- Maximum Output Current (Io): 93 mA
- Maximum External Capacitance (Co): 0.083 µF
- Maximum External Inductance (Lo): 4 mH
- Maximum Output Power (Po): 651 mW
The detector operates with a nominal line supply of 24 VDC (acceptable operating voltage range of 16 VDC to 28 VDC). In standard supervisory mode, quiescent standby current is ≤60 µA, increasing to an alarm current draw of ≤30 mA when smoke thresholds are breached. Loop reset requires an instantaneous power interruption of at least 5 seconds with line voltage brought down to a maximum of 2.5 VDC.
Addressable System Loop Integration
As a non-addressable conventional device, the detector does not occupy an individual soft address directly on an analog loop. For integration into intelligent GST addressable fire systems, the detector is fully compatible with the GST I-9332 Flame Proof Zone Monitor Interface. The I-9332 acts as the supervisory link, converting conventional zone alarm, open-circuit, and short-circuit fault conditions from hazardous locations into addressable loop data reported back to the central fire alarm control panel.
Field Cabling and Distributed Line Parameter Limits
System designers and field technicians must maintain compliance with line inductance and capacitance limits to preserve intrinsic safety across hazardous field cabling runs. Recommendations and thresholds include:
- Conductor Specification: 1.0 mm² or larger cross-section fire-rated cable
- Conduit Standard: Laid through metallic conduit or flame-retardant conduit according to local electrical codes
- Maximum Distributed Capacitance: Must not exceed 0.083 µF across field wiring
- Maximum Distributed Inductance: Must not exceed 4.1 mH across field wiring
