I. Basic Attributes

Brand: GE Panametrics (formerly part of GE Baker Hughes - analytical instruments)

Positioning: Intrinsically safe on-site display operation unit, used in conjunction with XMTC thermal conductivity gas transmitter and XMO2 oxygen analyzer, widely applied in hydrogen-cooled generators for power plants, power stations, and explosion-proof Zone 1 scenarios in the petrochemical industry.Interpretation of Model Suffixes

XDP: Explosion-proof Display Package - explosion-proof display package

221: Standard hardware platform

-2: Standard general firmware (compatible with multiple measurement ranges of hydrogen, air, and carbon dioxide; compared to XDP-221-20, it is a dedicated three-range firmware for hydrogen-cooled generators)

Core Hardware Functions

Power Supply Output

Built-in 24VDC isolated power supply, providing power for remote XMTC/XMO2 probe transmitters

Signal Acquisition

Receiving 4–20mA measurement signals from the probe, and the chip performs calculation and conversion to gas concentration values

Human-Machine Interaction

Backlit LCD digital display; 6-key infrared glass touch buttons (the explosion-proof shell does not have a hole, and operations are performed through the shell)

Signal Output

Analog output: 4–20mA / 0–20mA / 0–2V standard industrial signals, uploading to Mark VIe/DCS

5 programmable alarm relays (high and low limits, faults, drift alarms)

Communication Interface

RS232 / RS485 serial ports, supporting computer configuration calibration, data upload and record

Electrical and Explosion-proof Specifications Table

Parameters Indicators

Main power supply 100–240VAC wide-range mains power

Explosion-proof certification ATEX II 1G Ex ia IIC T6; Zone 1 explosion-proof area available

Shell material Aluminum cast explosion-proof housing, wall-mounted installation

Operating temperature -20℃ ~ +60℃

Protection level IP66

Loop isolation Full electrical isolation for input/output/power supply, resistant to strong electromagnetic interference from power plants

Typical Linkages for Power Plant Gas Turbine

Hydrogen-cooled generator scenario

XMTC thermal conductivity hydrogen gas probe → XDP-221-2 display conversion → 4–20mA connected to GE 04240FD11234A remote IO → Mark VIe main controller

Real-time monitoring of generator hydrogen purity, humidity, and leakage concentration

Can be combined with your previous complete set of GE power plant control hardware (151X excitation board, RS-FS-9001 flame probe, 3500 vibration system) to form a full plant monitoring system

IDifferentiation of the Same Model Version

XDP-221-2: General type, suitable for most gas measurement conditions

XDP-221-20: Hydrogen-cooled generator customized version, pre-installed with 3 hydrogen gas range programs

XDP-221-3: Multi-component mixed gas enhanced version