GE Panametrics XDP-221-1 (Explosion-Proof Gas Analyzer Display/Transmitter)
The XDP-221-1 is an explosion-proof gas analyzer display/control unit from GE (now Baker Hughes) Panametrics, designed for use in Zone 1 hazardous areas. It works with 4–20mA transmitters such as the XMO2 (oxygen) and XMTC (thermal conductivity) to measure binary gases including O₂, H₂, and CO₂.
Basic Information
Model: XDP-221-1 (XDP-221-2 is a higher-end version of the same series, featuring dedicated curves for hydrogen-cooled generators)
Brand: GE Panametrics (currently part of Baker Hughes)
Type: Explosion-proof display/transmitter (Ex d IIC T6, Class I Div 1)
Installation: Wall-mounted with explosion-proof housing and infrared “through-glass” keyboard
Core Applications: Hazardous area gas analysis (hydrogen production, air separation, hydrogen-cooled generators, chemical/petrochemical industries)
Key Features
Power & Signal: Supplies 24VDC to transmitters; receives and processes 4–20mA input signals
Display & Operation: High-resolution backlit LCD; 6-button infrared keypad; 5 programmable alarm relays
Output & Communication: Analog outputs of 4–20mA / 0–20mA / 0–2V; RS-232/RS-485 (Modbus)
Auto Calibration: Supports automatic verification/calibration, enabling long-term maintenance-free operation
Technical Specifications (Key Parameters)
Power Supply: 100–240VAC, 47–63Hz, 40W
Explosion Protection: Ex d IIC T6; Class I Div 1, Groups B/C/D
Measurement Ranges:
O₂: 0–100% or ppm level
H₂: 0–100% (in air/CO₂ background)
Accuracy: ±2% FS; Zero/span stability: ±0.5% FS/week
Response Time: ≤20s (90% step response)
Ambient Temperature: −20°C to +65°C (suitable for hazardous areas)
Dimensions (mm): 210 × 163.5 × 124; explosion-proof housing, IP66/4X
Differences Between XDP-221-1 and XDP-221-2
XDP-221-1: Standard model for general gas analysis (O₂/H₂/CO₂), basic alarm and communication functions
XDP-221-2: Specialized version for hydrogen-cooled generators, equipped with built-in three-curve software (air → CO₂ → H₂ purging process), optimized for power plant hydrogen-cooled units
Typical Applications
Hydrogen-Cooled Generators: Monitoring H₂/CO₂/air displacement to prevent explosions
Hydrogen Production/Air Separation: High-purity H₂/O₂ concentration monitoring
Chemical/Petrochemical Industries: Analysis of binary gases in hazardous areas (e.g., H₂/N₂, CO₂/air)
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