Honeywell XNX-UTAV-RNIF1 | Universal Gas Transmitter – MPD Infrared Sensor

Description

Key Technical Specifications

Product Introduction

The Honeywell XNX-UTAV-RNIF1 is a universal gas transmitter module designed to interface with Honeywell’s MPD infrared sensors. It acts as the “brain” for fixed gas detection systems, translating optical sensor data into industry-standard 4–20 mA and HART signals. This specific configuration is optimized for detecting hydrocarbon gases—such as propane and methane—in harsh environments where traditional catalytic sensors might fail due to poisoning or lack of oxygen.Its primary advantage lies in the NDIR (Non-Dispersive Infrared) technology, which offers superior stability compared to catalytic bead sensors. Field performance data shows that NDIR sensors do not degrade over time like catalytic ones, significantly reducing calibration frequency. The unit features a non-contact magnetic wand interface, allowing technicians to configure alarms or perform maintenance without opening the explosion-proof housing—a critical safety feature in Zone 1 hazardous areas.

Installation & Configuration Guide

Phase 1: Preparation (10 min)

1. Safety First: Ensure the area is safe and free of gas before starting. Verify power is off.
2. Mounting Check: The unit requires 3/4-inch NPT conduit entries. Ensure your mounting surface can support the aluminum enclosure weight.
3. Tools: Have a non-magnetic screwdriver and the Honeywell magnet tool ready.

Phase 2: Wiring & Mounting (15 min)

1. Conduit Entry: Connect your wiring through the NPT entries. Standard wiring is 4-wire (Power +/-, Signal +/-).
2. Grounding: Connect the earth ground terminal firmly; this is vital for EMC immunity.
3. Secure Enclosure: Tighten the housing bolts. Do not overtighten the glass window.

Phase 3: Power-On & Test (10 min)

1. Apply Power: Turn on the 24V DC supply. The LCD should backlight and display the gas reading (likely 0% LEL in fresh air).
2. Magnet Test: Use the magnet to toggle the display modes. Verify you can access the menu.
3. Signal Check: Measure the current loop; it should read approx. 4 mA at 0% LEL.

Troubleshooting Quick Reference

Dimensions, Mounting & Wiring Notes

• Dimensions: Approx. 200mm x 180mm x 100mm (varies by entry type).
• Mounting: Wall mount or 2-inch pipe mount options available.
• Wiring: Terminal blocks accept up to 14 AWG wire.
• Note: Keep signal wires shielded and separated from high-voltage AC lines to prevent noise interference on the 4-20mA loop.

FAQ

Q: What does the “RNIF1” suffix mean in the part number?
A: This suffix defines the specific configuration. Generally, it indicates the region (Rest of World), the enclosure material (Aluminum), and the number of conduit entries (usually 4 x 3/4″ NPT). Always verify the exact datasheet for your specific revision.Q: Can I use this detector for Carbon Monoxide (CO)?
A: No. The “MPD Infrared” sensor in this unit is tuned specifically for hydrocarbons (combustible gases). For toxic gases like CO, you would need an XNX unit configured with an electrochemical sensor (e.g., Toxic module).Q: My unit reads 5% LEL even when there is no gas. Is it broken?
A: It likely just needs a zero calibration. Infrared sensors can drift slightly with temperature changes. Go to a known fresh air location and perform a “Zero” calibration using the magnet switch. If the reading persists, the optics might be contaminated.Q: Is this compatible with Modbus?
A: The base XNX platform supports Modbus, but the “UTAV” model typically ships standard with 4-20mA and HART. You need to check the specific order code or label on the side of the unit to see if the Modbus daughterboard was installed.Q: How often do I need to calibrate this?
A: Unlike catalytic sensors which need testing every 3-6 months, NDIR sensors are very stable. Typically, a bump test once a year is sufficient, though local regulations may require more frequent checks.