Honeywell HA72 Digital Gas Controllers

Honeywell HA72 Digital Gas Controllers

Product Overview

HA72 is a high-performance multi-channel gas detection controller launched by Honeywell, supporting 16, 32, 48, or 64 channel configurations. Its core functions are real-time monitoring, alarm control, and data management, suitable for safe monitoring of toxic gases, flammable gases, and oxygen content in industrial environments. Its design emphasizes high scalability, flexible communication, and intelligent operation. It can receive data through analog signals, Modbus protocol, or wireless methods, and supports remote monitoring and configuration.

Core functions and features

1. System configuration and input/output

Channels and inputs: Supports up to 64 channels, compatible with analog signals (4-20mA, mV), Modbus RTU/TCP, wireless data transmission, and can directly connect to catalytic bead sensors, RTD temperature sensors, and other devices.

Output and Control:

Standard configuration includes 5 SPDT relays (3 programmable alarm relays, 1 fault relay, and 1 horn relay), supporting 3 levels of independent alarms (high, medium, and low thresholds can be set for each channel).

Optional discrete relay board (16 channels/board), programmable relay board (16 channels/board), and 4-20mA analog output board are available for driving external devices such as sound and light alarms and valves.

Power Supply and Power Consumption: Supports 24VDC power supply (10-30VDC), optional 600W or 150W AC/DC power supply (110-240VAC input), total power consumption varies with configuration (such as adding 6.5W per discrete relay board).

2. Display and operation

Interface design: 320 × 240 pixel color graphic LCD, providing 5 data views (main data screen, 24-hour trend chart, bar chart, combination view, area screen), supporting visual display of engineering units and alarm thresholds.

Operation mode: Non invasive magnetic keyboard (suitable for hazardous areas), supports password authorization mode (locking key configurations), built-in calibration mode (zero/range calibration).

Alarm indication: Each channel is displayed in green yellow red three color status (normal/fault/alarm), and the sound alarm is achieved through the built-in piezoelectric buzzer or external speaker, supporting remote reset and mute functions.

3. Communication and Data Management

Communication interface: Comes standard with 2 RS-485 ports (configurable as master/slave mode), optional with 2 isolated RS-485 ports, supports Modbus TCP/IP (Ethernet port), and can be networked with multiple machines (up to 128 HA72).

Data recording: Supports SD card storage configuration, event logs, and historical data (recording channel Min/Max/Avg values every 10 minutes), optional printer interface (real-time printing of alarm events with timestamps).

Remote monitoring: Built in web server, accessed through Ethernet, supports remote viewing of status, configuration parameters, and downloading logs.

4. Environmental adaptability and certification

Protection level: Multiple enclosure options are available, including NEMA 4X (fiberglass, dustproof and waterproof), NEMA 7 (aluminum alloy, explosion-proof, suitable for Class I, Div. 1/2 hazardous areas).

Working environment: temperature -25 ° C to+60 ° C, humidity 0-90% (non condensing), altitude up to 2000 meters.

Certification standards: Compliant with ISO 9001 quality management system and compatible with multiple international safety standards (such as UL, CSA).

Modular expansion and installation

Optional modules:

Analog input board (16 channels, supporting 4-20mA/mV signals), discrete relay board (16 channels, 5A contact capacity).

Bridge sensor interface board, RTD/4-20mA hybrid input board, 4-20mA output board.

Clock/printer interface board, 600W/150W power module.

Installation method: Supports panel installation, 19 inch rack installation, or wall mounted installation, with preset cable entry to simplify wiring.

Applicable scenarios

Typical applications: Chemical parks, oil and gas facilities, large factories, and other scenarios that require multi-point gas monitoring can be linked with Honeywell XNX, XCD and other series detectors to form a complete system.