1. Description:
The Honeywell 2104B2111 is specifically the Receiver Unit for the Honeywell Searchline Excel Infrared (IR) Open Path Flammable Gas Detector, designed for Short Range applications (5 to 40 meters / 15 to 130 feet). It is a crucial component of a system that provides continuous, non-contact detection of combustible hydrocarbon gases (such as methane, ethane, propane, ethylene, etc.) over a wide area. The Searchline Excel system operates by having a transmitter (e.g., 2104B2071) emit an infrared beam, and the receiver (2104B2111) detects this beam. When flammable gas is present in the path, it absorbs specific IR wavelengths, and the receiver measures this absorption to determine the gas concentration over the entire path. The 2104B2111 is built with a robust 316 stainless steel housing and is engineered for high immunity to environmental interferences like fog, rain, and direct sunlight. This particular model is an “ATEX Source” variant, meaning it provides the 4-20mA output as a current source.
2. Application Scenarios:
Consider a critical gas pipeline manifold in a remote desert environment. This area is expansive and exposed to extreme weather conditions, including intense sunlight, dust storms, and occasional heavy rain. A large gas leak could quickly disperse over a wide area, making point detectors insufficient for early warning. The Honeywell 2104B2111 Searchline Excel Short Range Receiver (paired with its compatible transmitter) would be deployed at multiple points along the manifold. These open path systems establish invisible detection zones. If a gas cloud emerges from a leak and enters a beam path, the receiver immediately detects the absorption, indicating the presence and concentration of flammable gas across that entire segment. This rapid, wide-area detection provides early warning, identifies the approximate location and size of the hazard, and initiates safety protocols. This directly addresses the pain points of monitoring vast, environmentally challenging areas where traditional point detectors would struggle with coverage, reliability, and maintenance, ensuring robust safety in critical infrastructure.
3. Parameter:
Main Parameters Value/Description Product Model: Honeywell 2104B2111 Manufacturer: Honeywell Analytics (part of Honeywell) Product Category: Open Path Infrared Flammable Gas Detector – Receiver Unit Associated Product: Honeywell Searchline Excel Open Path Gas Detector System Function: Detects infrared beam from the transmitter and measures gas absorption Gas Types Detected: Hydrocarbons (Methane, Ethane, Propane, Butane, Pentane, Ethylene, Propylene, Butadiene, Ethanol, Methanol) Detection Range: 0 to 5 LEL.m (Lower Explosive Limit per meter) Path Length (Short Range): 5 to 40 meters (15 to 130 feet) Light Source (from transmitter): Xenon flash lamp Output Signal: 4-20mA analog output (current source) and/or Modbus RS485 (via termination unit) Supply Voltage: 18V to 32V DC, 8W maximum consumption Response Speed (T90): Less than 3 seconds (under normal operating conditions) Operating Temperature: -40°C to +65°C (-40°F to 150°F) Operating Humidity: 0 to 99% RH (non-condensing) Housing Material: 316 Stainless Steel Ingress Protection: IP66 and IP67 Approvals: ATEX, IECEx, UL, FM/CSA, SAA, GOSST (for hazardous areas and performance) Immunity: 100% immune to sunlight and other radiation sources (flare stacks, arc welding, lightning) Features: Contamination resistant optics, integral functional gas test facility, advanced diagnostics (window clarity, alignment accuracy).
4. Technical Principles and Innovative Values:
The Honeywell 2104B2111 Searchline Excel Short Range Receiver embodies sophisticated technical principles and offers significant innovative value:
- Innovation Point 1: Dual-Beam Infrared Absorption Spectroscopy with Advanced Processing: The receiver is designed to precisely detect two specific infrared wavelengths emitted by the transmitter: a measurement wavelength absorbed by the target gas and a reference wavelength that is not. The innovative value lies in its high-speed digital signal processing, which accurately compares the received signals from both wavelengths. This allows the system to compensate for environmental interferences (like fog, rain, or dust) and ensure highly specific and quantitative detection of gas concentrations over the entire path.
- Innovation Point 2: Unrivaled Solar Immunity and Robustness: The 2104B2111, in conjunction with the Xenon flash lamp transmitter, is uniquely designed to be 100% immune to direct sunlight and other strong IR sources (like flare stacks). The receiver’s detectors are specifically tuned to the pulsed and shaped infrared output of the transmitter, effectively rejecting extraneous signals. This robust immunity is a critical innovation, ensuring uninterrupted and reliable gas detection in outdoor and challenging industrial environments where other IR detectors might fail.
- Innovation Point 3: Wide Area Coverage with Quantitative Measurement and Advanced Diagnostics: The Searchline Excel system, with the 2104B2111 receiver, provides continuous, wide-area volumetric detection (0-5 LEL.m). This gives a quantitative measure of the gas cloud size, which is invaluable for understanding the hazard. Furthermore, the receiver incorporates advanced diagnostics, including continuous monitoring of window clarity and alignment accuracy, to provide maximum uptime and ensure the system is always operating optimally without unrevealed failure modes.
