DET-TRONICS PIR9400 POINT WATCH IR HYDRO GAS DETECTOR 006300-006 PIR9400A2P2AW

Description

The Det-Tronics PointWatch IR (PIR9400) is an advanced, explosion-proof infrared (IR) gas detector designed to monitor combustible hydrocarbon gases. The PIR9400A2P2AW specific model is engineered for reliability in extreme industrial environments, such as offshore platforms, refineries, and chemical processing plants. It utilizes infrared absorption technology to detect methane and other hydrocarbons with high precision, virtually eliminating the “poisoning” risks associated with traditional catalytic bead sensors.

 

Technical Specifications

• 🛠️ Part Number: 006300-006 (Model: PIR9400A2P2AW)
• ⚙️ Technology: Infrared (IR) absorption (dual-beam technology)
• ⛽ Target Gases: Hydrocarbons (factory-calibrated for methane, with cross-sensitivity options available)
• 🛡️ Enclosure: Explosion-proof, stainless steel (SS) housing for corrosion resistance
• 🔌 Output: 4–20 mA signal with HART protocol, plus relay outputs (Alarm/Fault)
• 🌡️ Operating Temp: Typically -40°C to +75°C
• 🏅 Approvals: FM, ATEX, IECEx, and CSA certified for Class I, Division 1/2 hazardous locations.

 

Key Features

• Dual-Beam Optics: The detector uses a reference beam and a measure beam to compensate for optics fouling (dirt, dust, or snow on the lens), ensuring long-term stability.
• Non-Poisoning: Unlike catalytic sensors, the PIR9400 is not affected by silicone or high-concentration gas exposure.
• Self-Diagnostic: Continuous internal health monitoring detects optical obscuration, electronic faults, or power supply fluctuations.
• Easy Calibration: Magnetic calibration tool allows for non-intrusive adjustments without opening the explosion-proof housing.

Application Areas

• Upstream Oil & Gas: Offshore platforms and pipeline compressor stations.
• Downstream Processing: Refineries, chemical plants, and fuel storage facilities.
• Power Generation: Gas turbine enclosures and hydrogen-cooled generator areas.
• LNG Facilities: Liquefied natural gas regasification and storage terminals.

 

Product Usage Instructions

1. Mounting: Mount the detector with the sensor pointing downwards to prevent water/dust accumulation on the optical path. Use the stainless steel mounting plate provided to ensure rigidity against vibration.
2. Wiring: Use shielded, twisted-pair cable for the 4–20 mA loop. The shield must be grounded at the control cabinet end only to prevent ground loops.
3. Calibration: Use the magnetic calibration tool provided by Det-Tronics. Place the magnet over the calibration target on the housing to trigger the local menu via the status LEDs.
4. Maintenance: Regularly inspect the protective lens/window. If environmental conditions are particularly dusty, use the optional weather shield (a “rain/sun shade”) to keep the optics clean.

 

Frequently Asked Questions (Q&A)

Q: How often does the PIR9400 need recalibration? A: Due to the stable nature of IR technology, it requires far less frequent calibration than catalytic sensors. Periodic checks (every 6–12 months) are usually sufficient for standard industrial applications. Q: Can it detect hydrogen? A: No. Infrared technology does not detect hydrogen gas because hydrogen molecules do not absorb infrared radiation. You would need a different sensing technology (like electrochemical or catalytic bead) for hydrogen leak detection. Q: What does the “A2P2AW” suffix represent? A: This code defines the specific hardware configuration, including the housing material (A for Aluminum or S for Stainless), the mounting thread (e.g., 3/4″ NPT), and the hazardous area certification group.

 

Troubleshooting Tips

• Fault LED Flashing: Often indicates that the optics are obscured. Clean the lens with a soft cloth and non-abrasive cleaner.
• Drifting Readings: Check for excessive vibration at the mounting site or extreme temperature gradients that might be affecting the IR source stability.
• HART Communication Issues: If your PLC cannot communicate, check the loop resistance; HART communication requires a minimum of 250 ohms in the loop to function correctly.

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