I. Basic Material Information
Model: IR-148
Brand: Honeywell (formerly Zellweger Analytics)
Product Type: Non-dispersive Infrared (NDIR) multi-point gas online monitoring and analysis instrument
Sampling Specifications: Optional 1-point, 4-point, 8-point multi-channel round-robin sampling detection
Communication Method: RS485 bus, supports networking of multiple devices to connect to DCS/SIS system
Companion Accessories: Special IR-148 remote relay expansion module, used for multi-level on-site hard-point output of alarms
Core Detection Principle
Adopt NDIR infrared spectroscopic absorption detection technology, precisely and quantitatively detecting gases through specific infrared wavelength bands:
Refrigerants (R134a, R22, HCFC, HFC), methane, propane, hydrocarbon solvents, refrigerant leakage gases;
Not affected by water vapor, dust, or ordinary temperature and humidity, compared to catalytic combustion sensors, there is no risk of poisoning and failure, and has a longer lifespan.
Key Technical Parameters
Measurement Range (Common Refrigerants)
R134a: 0~100ppm
R22: 0~360ppm
Methane: 0~100% LEL
The range can be customized and calibrated through the host panel
Three-level Alarm Thresholds (factory default)
Warning Caution: 9ppm
Warning Warning: 29ppm
Emergency Alarm: 700ppm
Relay Output Specifications
3-channel C-type (SPDT) passive relays with contact capacity: 240VAC/8A resistive load;
Equipped with a built-in fault self-energizing relay, triggering alarms when power is lost or equipment fails, in line with safety failure design.
Power Supply and Environment
Power Supply: 85~264VAC wide voltage AC power supply
Operating Temperature: 0℃~+50℃
Protection Grade: IP30, cabinet wall-mounted installation
Sampling Method: Vacuum pump negative pressure pipeline sampling, the longest sampling pipeline can reach 30 meters, multi-channel sequential round-robin detection.
Core Functions
Multi-point Round-Robin Leak Monitoring
One host can cyclically collect up to 8 on-site sampling pipelines, centralized monitoring of gas leaks in refrigeration rooms, substations, and refrigerant workshops.
Multi-level Safety Alarm Interlock
Three-level gas concentration alarms + equipment failure alarms, relay hard-point contacts can directly link to exhaust fans, sound and light alarms, ESD safety shutdown circuits.
Remote Expansion Alarm
Through RS485 connection to the remote relay cabinet, alarm contacts can be scatteredly arranged in the duty room, on-site local control cabinets.
Data Upload and Self-Diagnosis
Can upload real-time gas concentration, channel status, fault codes to DCS system via Modbus protocol; has self-check functions for gas path blockage, pump failure, sensor failure.
Range Calibration, Alarm Self-Synchronization
Support single-point/multi-point standard gas calibration, alarms can be set to self-synchronized mode, and need to be manually reset to be released.
Typical Application Scenarios
Online Monitoring of Refrigerant (Freon) Leakage in Power Plants, Data Centers, Large Refrigeration Rooms
Carbon Hydrocarbon Solvents, Flammable Gas Leakage Detection in Petrochemical Plants, Pharmaceutical Workshops
SF6 Companion Refrigerant Environmental Safety Monitoring in Cold Storage Warehouses, Central Air Conditioning Rooms, Substations
Toxic and Harmful Gas Patrol Monitoring Alarm System in Industrial Buildings’ Enclosed Spaces
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