Honeywell XNX-UTAV-RNIF1 | Universal Gas Transmitter with MPD Sensor | In Stock

Description

Key Technical Specifications

• Sensor Type: MPD (Multi-Purpose Detector) Infrared Sensor
• Target Gas: Flammable Hydrocarbons (e.g., Propane, Methane)
• Measurement Range: 0 – 100% LEL (Lower Explosive Limit)
• Output Signal: 4-20mA with HART® protocol (Standard)
• Relay Outputs: 3 x Fault/Alarm Relays
• Enclosure Material: Painted LM25 Marine-grade Aluminum (Stainless Steel 316 optional)
• Display: Large backlit LCD with text, digits, and status icons
• Operation: Non-contact magnetic switches (no need to open the cover)
• Conduit Entries: 4 x 3/4 inch NPT entries
• Certifications: ATEX, IECEx, UL, CSA, SIL2 approved
• Operating Temperature: -40°C to +65°C (-40°F to +150°F) (depending on sensor)

Product Introduction

Trying to detect flammable gas leaks in a freezing outdoor refinery or a dusty chemical plant with cheap catalytic sensors is a losing battle. The Honeywell XNX-UTAV-RNIF1 is built specifically to solve this headache. It is a universal gas transmitter that uses an MPD infrared sensor, which means it does not need oxygen to work and will not get poisoned by silicones or sulfides like traditional catalytic bead sensors do.This transmitter is the backbone of safety for detecting hydrocarbons like propane and methane. What makes the XNX-UTAV-RNIF1 a favorite among instrument techs is its modularity and the standard 4-20mA with HART output. You can configure alarms, check diagnostics, and calibrate the sensor without ever unscrewing the explosion-proof housing, thanks to the non-contact magnetic switches. It is SIL2 approved and built to take a beating in Zone 1 hazardous areas.

Quality SOP & Tech Pitfalls (The Reality Check)

The Lab Report (SOP):
Every Honeywell XNX transmitter goes through a rigorous check before it ships. We start with a visual inspection of the heavy-duty aluminum housing and the glass viewport for any cracks. We then power it up on a 24V DC test bench to verify the backlit LCD boots up correctly and cycles through its self-test. We simulate a 4-20mA loop to ensure the HART communication is responsive, and finally, we seal it in anti-static packaging.The Engineer’s Warning (Pitfalls):
Here is a classic mistake: assuming all XNX transmitters are the same. The “RNIF1” suffix is critical—it tells you this unit has an MPD Infrared sensor, 3 relays, and specific conduit entries. If you swap this with a standard catalytic XNX, the calibration and gas response will be completely wrong. Also, infrared sensors are sensitive to heavy rain or snow blocking the optical path. I have seen false alarms trigger just because someone mounted the detector facing straight up into a downpour. Always install it with the sensor head angled slightly downward.

Installation & Configuration Guide

1. Pre-Installation

• ⚠️ SAFETY FIRST: Ensure the area is safe and permits are issued for working in a hazardous location. Verify power is off before wiring.
• Check the nameplate to confirm the model (XNX-UTAV-RNIF1) matches your engineering drawings and the gas you are trying to detect.

2. Mounting

• Use the robust mounting bracket. The unit is heavy (aluminum/steel), so ensure the stand or wall mount can support it.
• CRITICAL STEP: Point the sensor head slightly downward (about 45 degrees) to prevent water, snow, or dust from accumulating on the infrared optical windows.

3. Wiring

• Open the wiring compartment (not the sensor compartment). Connect your 24V DC power and the 4-20mA loop to the designated terminals.
• If using the relays, wire them according to your logic (Normally Open/Closed) for your PLC or fire panel.

4. Power-On & Testing

• Restore power. The LCD will light up and show the Honeywell logo, followed by the live gas reading (should be 0% LEL in clean air).
• Use a magnet to navigate the menu and verify the relay states. Do not open the cover in a live hazardous area.

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Can I use this to detect toxic gases like H2S or CO?
No. The XNX-UTAV-RNIF1 is specifically configured with an MPD Infrared sensor for flammable hydrocarbons (like propane/methane). For toxic gases, you would need an XNX transmitter fitted with an electrochemical sensor module.Do I need to open the cover to calibrate it?
No, and you shouldn’t. The XNX features non-contact magnetic switches. You just wave a magnet over the icons on the glass to navigate the menu. This keeps the explosion-proof integrity intact and saves you time.What does the “MPD” sensor actually mean?
MPD stands for Multi-Purpose Detector. It is an infrared technology that detects hydrocarbons by measuring light absorption. The huge advantage is that it won’t get “poisoned” by contaminants that kill standard catalytic sensors, and it works perfectly fine in low-oxygen environments.My display is showing a fault code. What do I do?
The backlit LCD is very descriptive. It will usually give you a text warning or a specific fault icon. Common issues are a dirty optical window (needs cleaning) or a loop wiring issue. Check the manual for the specific fault code, but usually, a quick clean of the sensor head fixes 90% of IR sensor faults.Is this unit suitable for offshore or marine environments?
Yes. The standard housing is marine-grade painted aluminum (LM25), and you can even get it in Stainless Steel 316. It is designed to withstand salt spray, high humidity, and extreme temperature shifts.