Det-Tronics PIR9400A3A1AW – Infrared Hydrocarbon Gas Detector | PointWatch PIR9400 Platform
Engineering Background: The PointWatch PIR9400 series is Det-Tronics’ field-proven infrared (IR) point gas detector, engineered for continuous hydrocarbon gas monitoring in safety-critical industrial environments. Leveraging non-dispersive infrared (NDIR) sensing technology, the PIR9400A3A1AW delivers stable, cross-sensitivity-free detection without the drift and poisoning vulnerabilities inherent to catalytic bead sensors.
Product Positioning: Designed for upstream oil & gas, petrochemical, LNG, and offshore platform applications, this detector integrates seamlessly into Det-Tronics’ Eagle Quantum Premier (EQP) Safety System and third-party fire & gas control panels via standard 4–20 mA analog output. It is the preferred choice for procurement engineers specifying IEC 60079-compliant gas detection in Zone 1/Zone 2 and Class I Div 1/Div 2 classified areas.
Complete Technical Specifications
- Part Number: PIR9400A3A1AW
- Detection Technology: Non-Dispersive Infrared (NDIR)
- Target Gas: Hydrocarbon gases (methane, propane, butane, and similar)
- Measurement Range: 0–100% LEL
- Output Signal: 4–20 mA (linear, 0–100% LEL); HART optional
- Alarm Setpoints: Configurable Low / High / High-High
- Response Time (T90): ≤ 15 seconds (methane, at rated flow)
- Operating Temperature: –55°C to +75°C (–67°F to +167°F)
- Humidity: 0–99% RH, non-condensing
- Enclosure Rating: IP66 / NEMA 4X
- Hazardous Area Certification: ATEX / IECEx Zone 1 & Zone 2; FM Class I Div 1 & Div 2, Groups B, C, D
- Housing Material: Copper-free aluminum alloy
- Weight: Approx. 2.6 kg (5.7 lb)
- Power Supply: 18–32 VDC
- Power Consumption: ≤ 4 W (steady state)
- Cable Entry: 3/4″ NPT conduit entry
- Mounting: 2″ pipe mount or wall bracket (included)
- Warm-Up Time: ≤ 60 seconds to operational status
- Self-Diagnostics: Continuous optical path monitoring; fault relay output on failure
- Country of Origin: United States
Proven Application Environments
- Offshore oil & gas platforms (topside and subsea utility modules)
- Onshore gas compression and metering stations
- LNG liquefaction and regasification terminals
- Petrochemical and refinery process units
- Pipeline pump stations and pig launchers/receivers
- Chemical storage and loading/unloading facilities
- Power generation plants using hydrocarbon fuels
- Confined spaces requiring continuous gas monitoring per OSHA 1910.146
Engineering Advantages
- Poison-Resistant NDIR Sensing: Immune to silicone, sulfur, and halogen compounds that degrade catalytic bead sensors — dramatically reduces false alarms and maintenance costs.
- Wide Temperature Range: –55°C to +75°C operational envelope covers arctic and desert deployment without heater accessories.
- Continuous Self-Diagnostics: Optical path integrity monitoring detects window fouling, source degradation, and detector failure — providing SIL-capable fault transparency.
- EQP System Integration: Native compatibility with Det-Tronics Eagle Quantum Premier controller for loop-powered, addressable safety system architectures.
- Dual Certification: ATEX/IECEx + FM/CSA dual-certified for global project deployment without re-engineering.
- Low Maintenance: No consumable sensor elements; calibration interval typically 12 months with certified calibration gas.
System Architecture & Signal Flow
The PIR9400A3A1AW operates as a two-wire (power + signal) 4–20 mA transmitter. The IR source emits broadband infrared radiation across the optical measurement cell. Hydrocarbon gas molecules absorb energy at specific IR wavelengths (3.3 µm band); the detector compares active and reference channel signals to compute gas concentration. The linearized 4–20 mA output (4 mA = 0% LEL, 20 mA = 100% LEL) is transmitted to the control panel or EQP safety controller. A dedicated fault current (typically 21 mA) signals instrument failure to the panel, enabling SIL 2 loop integrity verification.
Sourcing & Quality Verification
- All units sourced directly from authorized Det-Tronics distribution channels or verified surplus with full traceability documentation.
- Each unit inspected for physical integrity, label authenticity, and certification plate compliance prior to shipment.
- Original factory calibration certificates and EU Declaration of Conformity (DoC) available upon request.
- Serialized units — provide serial number for factory warranty status verification via Det-Tronics Customer Service.
- Konmask.com maintains ISO-aligned incoming inspection records for all safety-critical instrumentation.
Procurement Process
- Step 1: Confirm part number PIR9400A3A1AW matches your project BOM and area classification requirements.
- Step 2: Submit RFQ via support@konmask.com or place order directly through this listing.
- Step 3: Receive order confirmation with lead time, serial number allocation, and shipping documentation within 1 business day.
- Step 4: Shipment with commercial invoice, packing list, and available certification documents (ATEX DoC, FM certificate copy).
- Step 5: Post-delivery technical support available for installation, commissioning, and calibration queries.
Technical FAQ
Q: Is the PIR9400A3A1AW compatible with third-party control panels (non-EQP)?
A: Yes. The standard 4–20 mA output is universally compatible with any panel accepting a linear 4–20 mA gas detector input. HART communication requires a HART-capable panel or handheld communicator.
Q: What calibration gas is required?
A: Methane (CH₄) in nitrogen at 50% LEL concentration is the standard calibration gas. Propane or other target hydrocarbons may be used with appropriate conversion factors per the Det-Tronics calibration manual.
Q: Can this unit be used in hydrogen service?
A: No. NDIR technology does not detect hydrogen (H₂) as it has no IR absorption at the 3.3 µm band. A catalytic bead or electrochemical sensor is required for hydrogen applications.
Q: What is the warranty period?
A: New units carry Det-Tronics’ standard 2-year limited warranty. Surplus/refurbished units are covered by Konmask.com’s 90-day functional warranty. Contact us for details.
Q: Is SIL 2 certification available for this model?
A: The PIR9400 series supports SIL 2 capable loop design when installed per the Det-Tronics Safety Manual. Consult the product SIL data sheet (available on request) for PFDavg and architectural constraints.
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