Description

Key Technical Specifications

Parameter	Value
Part Number	769150 / 769150A
Component Type	Optical Filter (NO)
Target Gas	Nitric Oxide (NO)
Compatible Analyzer	EL3020, AO2020 (Uras26 Module)
Filter Specification	LP5220
Application	Infrared gas analysis measurement path
Condition	New Original
Warranty	12 Months
Origin	OEM Manufacturing (Verify label)
Packaging	Anti-static bag + Bubble wrap

Product Introduction

The ABB 769150A is a specialized optical filter designed specifically for the Nitric Oxide (NO) detector channel within ABB’s advanced gas analyzer systems. It acts as a critical spectral isolation component, ensuring that only the precise infrared wavelength required for accurate NO measurement reaches the detector, effectively filtering out background interference from other gases.This component is essential for maintaining the cross-sensitivity specifications of the Uras26 measurement module found in EL3020 and AO2020 analyzers. Without a properly functioning optical filter, baseline drift and measurement inaccuracies are common. This part ensures the system meets its intended performance metrics for environmental monitoring and process control applications.

Installation & Configuration Guide

Replacing an optical filter requires precision. Follow these steps to ensure proper alignment and avoid contamination.Preparation (10 min)

Power down the analyzer completely and disconnect the main power supply.
Allow the Uras26 bench to cool down if it has been running (internal components can get hot).
Gather your tools: appropriate screwdrivers and a clean, lint-free cloth.
Put on an ESD wrist strap. Static discharge can damage sensitive electronic boards nearby.

Removal of Old Filter (5–10 min)

Open the analyzer front door and locate the Uras26 measurement module.
Carefully remove the module cover or access plate protecting the optical bench.
Locate the existing optical filter assembly (usually positioned between the chopper motor and the detector cell).
Pro Tip: Take a clear photo of the current orientation and wiring before disconnecting anything.
Unscrew the retaining clips or screws holding the filter housing. Gently lift the old filter out.

Installation of New Filter (10 min)

Remove the new ABB 769150A from its protective packaging. Handle it by the edges only—oils from your skin can ruin the optical surface.
Place the new filter into the housing, matching the orientation you photographed earlier.
Secure the housing with the screws. Do not overtighten, as this can warp the mounting bracket.
Reinstall the module cover or access plate.

Power-On & Test (10 min)

Restore power to the analyzer.
Allow the system to complete its warm-up cycle (typically 30 minutes to 1 hour for thermal stabilization).
Navigate to the diagnostic menu to check the detector signal strength.
Perform a zero and span calibration using certified calibration gases to verify accuracy.

Troubleshooting Quick Reference

Issue	Probable Cause	Action
No Signal / Zero Reading	Loose connection or misalignment	Check wiring harness to the detector; ensure filter is seated correctly.
High Noise / Unstable Reading	Contaminated optical surface	Inspect the filter glass. Clean gently with approved optics cleaner if needed.
Calibration Failure	Wrong filter installed	Verify the part number matches 769150A (NO filter), not SO2 or CO.
Baseline Drift	Thermal instability	Ensure the analyzer has warmed up fully; check internal cooling fans.
Physical Fitment Issue	Incorrect module version	Confirm your Uras26 module revision matches the spare part generation.

Dimensions, Mounting & Wiring Notes

Dimensions: Compact component designed to fit within the Uras26 optical bench assembly. Exact H×W×D varies by specific housing revision (refer to the physical unit).
Mounting Method: Secured via small machine screws or spring clips directly onto the optical bench frame. Alignment pins are often used to prevent rotational error.
Terminal/Wiring Notes: The optical filter itself is passive and has no wiring. However, ensure that the adjacent detector wiring (often a small multi-pin connector) is not pinched during reassembly.

FAQ

Q: I have an ABB EL3020, will this 769150A filter work for my NO channel?
A: Yes. The 769150A (often listed simply as 769150) is the standard replacement optical filter for the Nitric Oxide (NO) channel in the EL3020 series analyzers utilizing the Uras26 measurement technique.Q: Can I swap this with the SO2 filter (768491) if they look the same?
A: Absolutely not. While they may look physically identical, they are tuned to completely different wavelengths (LP5220 for NO vs. LP6600 for SO2). Using the wrong one will result in total measurement failure for that channel.Q: Does this part come with the gaskets and screws?
A: Usually, the optical filter is supplied as the core component. We recommend reusing the original mounting hardware and gaskets if they are in good condition to ensure a perfect seal against light leaks.Q: How long is the lead time if I need this urgently?
A: We keep this high-demand spare part in stock. For most regions, we can ship within 1-2 business days. Contact us directly for express shipping options to your location.Q: Is there a risk of damaging the detector when changing this?
A: There is a minor risk if handled roughly. The detector cell is sensitive to physical shock and light exposure. Work methodically, keep the optical bench covered when open, and avoid touching the detector window.