# White-Background AFR Stack Gauge with Bosch Wide-Band Lambda Sensor

> The ST3404 AFR/Lambda Stack air-fuel analyzer with white background displays the air-fuel ratio or lambda value in real time. It comes with a Bosch LSU 4.9 sensor and features 0–5 V and serial outlets, as well as a programmable alarm.

- URL: https://www.gt2i.com/en/afr-sensors-lambda-sensors/78499-white-background-afr-stack-gauge-with-bosch-wide-band-lambda-sensor-3661768603505.html
- Reference: ST-3404
- Price: €488.30
- Regular price: €514.00
- Brand: STACK
- Availability: out of stock

## Description

AFR / Wideband Lambda Stack Air-Fuel Analyzer ST3404 with white background and Bosch LSU 4.9 lambda sensor
The AFR / Wideband Lambda Stack ST3404 air-fuel analyzer displays the air-fuel ratio (AFR) or Lambda value in real time, selectable by the user. Developed for racing and engine tuning applications, it combines a red digital display with a multicolored LED radial indicator on a white background, providing quick and accurate readings.
The system features adjustable calibration to optimize the display based on the type of fuel used. It also includes a memory for the maximum lean mixture value, a programmable alarm, a light sensor for automatic adjustment of display brightness, as well as 0-5 V analog and series outlets for connection to an engine control module (ECU), a data logger, or any other compatible system. A Pro-Control outlet also allows for the automatic control of other equipment based on the measured lambda value.
The gauge comes with a complete wiring harness for the electrics and a Bosch LSU 4.9 sensor.
Technical Specifications
Brand: Stack
Part Number: ST3404
Type: AFR/Wideband Lambda Air-Fuel Analyzer
Diameter: 52 mm
Background Color: White
Display:
 
AFR or Lambda value (user-selectable)
Red digital display
Multicolored radial LED indicator
Brightness automatically adjusted by light sensor
Features:
 
User calibration based on fuel type
Memory for maximum lean mixture value
Programmable alarm
0–5 V analog outlet
Serial data outlet
Pro-Control outlet
ECU and data logger compatible
Compatible fuels:
 
Unleaded gasoline
Methanol
Ethanol
LPG (Propane)
CNG (Compressed Natural Gas)
Compatible with nitrous oxide (in accordance with applicable regulations)
Included sensor: Bosch LSU 4.9
Specifications of the Bosch LSU 4.9 sensor
 
Length: 84 mm
Weight (excluding cable): 120 g
Mounting wrench: 22 mm
Tightening torque: 40 to 60 Nm
Gas operating temperature: up to 930 °C
Maximum gas temperature: less than 1,030 °C
Maximum vibration resistance: 100 g
Not compatible with:
 
Leaded gasoline
2-stroke engines
Includes:
 
Stack ST3404 Air-Fuel Analyzer
Electric wiring harness
Bosch LSU 4.9 sensor
Key Features
 
Selectable AFR or Lambda display
High-visibility white background
High-visibility digital display and multicolored LED
Calibration based on the fuel used
Memory for maximum lean mixture value
Programmable alarm
0-5 V analog and serial outlets
ECU and data logger compatible
Bosch LSU 4.9 sensor included

## Features

- Product type: Air-fuel analyzer
- Diameter in mm: 52
- Background Color: White
- First word type: Analyzer