SPXCDULNTXF HONEYWELL

The Honeywell SPXCDULNTXF is a high-performance fixed gas detector belonging to the Sensepoint XCD (Exceed) family. This specific model is an explosion-proof transmitter designed for the continuous monitoring of Nitrogen Dioxide ($NO_2$) in hazardous environments. It combines a rugged transmitter housing with an electrochemical sensor to provide a comprehensive gas detection solution. The UL designation indicates that the unit is certified to North American safety standards for use in Class I, Division 1 and 2 locations.

Product Parameters

Input Voltage: $16$ to $32$ VDC, with a nominal operating voltage of $24$ VDC.

Detected Gas: Nitrogen Dioxide ($NO_2$).

Measurement Range: Typically configured for $0$ to $50.0$ parts per million (ppm).

Output Signals: A standard $4$ to $20$ mA analog output (configurable as source or sink) and three internal programmable relays for Alarm 1, Alarm 2, and Fault.

Display: Integrated tri-color backlit LCD. The screen turns green during normal operation, yellow during a fault condition, and red during an alarm event.

Housing Material: Epoxy-painted aluminum alloy (LM25) or optional 316 stainless steel.

Connection Threads: Dual $3/4$ inch NPT cable entries for flexible wiring.

Ingress Protection: Rated IP66 and NEMA 4X, making it suitable for harsh outdoor and wash-down environments.

Certifications: UL and cUL approved for hazardous locations.

Product Advantages

One of the primary advantages of the SPXCDULNTXF is its "one-man" non-intrusive operation. By using a magnetic wand, users can calibrate the device and navigate the configuration menus through the glass window without ever opening the enclosure, which is critical for maintaining safety in explosive atmospheres. The tri-color display provides immediate visual diagnostic information, allowing personnel to identify the safety status of an area from a distance. Furthermore, the plug-and-play sensor design allows for quick and easy sensor replacement at the end of its life cycle, minimizing downtime and reducing the total cost of ownership. The inclusion of internal relays also allows the unit to act as a standalone controller that can directly trigger sirens or ventilation fans.

Important Considerations

When installing the SPXCDULNTXF, it is vital to consider the physical properties of the target gas. Because Nitrogen Dioxide is heavier than air, the detector should be mounted at a low height, usually close to the floor where the gas is likely to pool. Proper positioning ensures the fastest possible response time. Regular maintenance is required, including periodic calibration with a certified gas cylinder to ensure the electrochemical cell remains accurate. Operators should avoid exposing the sensor to high concentrations of cross-sensitive gases that might lead to false readings or sensor poisoning. Additionally, ensure that the cable entries are properly sealed with approved conduits or glands to maintain the IP66 and explosion-proof integrity of the housing.