As a key device in the field of industrial safety monitoring, this control card is widely used in scenarios requiring real-time monitoring of combustible or toxic gas concentrations—such as petrochemicals, metallurgy, energy, and warehousing—thanks to its high compatibility, stable signal processing capability, and flexible configuration features. It provides reliable technical support for industrial environmental safety.Its design complies with international industrial safety standards. It can not only accurately interface with various gas sensors that output 4-20mA signals but also enable convenient calibration, maintenance, and system configuration through the supporting Engineering Card, helping enterprises build an efficient and stable gas safety monitoring system.

I. Core Functions and Technical Features

1. Accurate Signal Processing and Data Display

Signal Input and Processing

Specifically designed for 4-20mA standard current signals, it can accurately receive gas concentration signals from 4-20mA loop-powered sensors or transmitters. The built-in microprocessor performs filtering, amplification, and linearization on the signals to ensure data accuracy. It supports real-time monitoring of sensor signals and can display the sensor loop current (unit: mA), intuitively reflecting changes in gas concentration.

Four-Part LCD Display System

• Analog Display: A 25-segment bar graph covering the range of -10% to +110% full-scale deflection (fsd). It presents real-time gas concentration trends in solid or single-line mode and supports a peak hold function to record the maximum/minimum concentration values during the monitoring cycle.
• Digital Display: A 4-digit seven-segment display. Configurable according to the sensor range, it shows gas concentration values (e.g., % LEL, ppm) in integer or one-decimal-place format, with a resolution of 1% fsd.
• Message Display: A 4-digit 14-segment display. It intelligently feeds back sensor status (such as "STEL", "LTEL", "FAULT") and alarm types (such as "A1", "A2", "VOTE"), facilitating quick identification of system operating conditions.
• Icon Display: Distinguishes between "normal operation" and "engineering card selected" statuses through status icons, making the operating status clear at a glance.

2. Multi-Level Alarm Management and Safety Assurance

Support for Multiple Alarm Types

It can be configured with three levels of concentration alarms: A1 (first-level alarm), A2 (second-level alarm), and A3 (third-level alarm). It also supports STEL (Short-Term Exposure Limit, usually a 10/15/30-minute time-weighted average), LTEL (Long-Term Exposure Limit, usually an 8-hour time-weighted average), and Rate (rate-of-rise alarm, predicting gas concentration upward trends) to meet safety threshold requirements of different industrial scenarios.

Alarm Indication and Linkage

Equipped with 3 red alarm LEDs (A1/A2/A3), 1 yellow fault LED (FAULT), and 1 yellow inhibit LED (INHIBIT), the alarm status is intuitively visible. It supports linkage with external relay cards (such as Double SPCO, Triple SPCO, High Integrity Relay Card) — when the concentration exceeds the limit, it triggers relay output to drive external emergency devices like audible-visual alarms and exhaust equipment, forming a complete safety response chain.

Fault and Inhibit Protection

Built-in hardware and software self-detection functions. When the sensor is disconnected, short-circuited, or the signal exceeds the preset range, the FAULT LED lights up and triggers a fault alarm. It supports local or remote inhibit functions (INHIBIT) to temporarily block alarm output during system startup (approximately 30-second warm-up period), calibration, or maintenance, avoiding false triggers.

3. Flexible Configuration and Convenient Operation

Reset/Select One-Button Dual Function

• Alarm Reset: A short press resets triggered latched alarms, inactive alarms, and fault prompts. It also clears peak records and updates alarm confirmation.
• Channel Selection: A long press (approximately 1.5 seconds) selects the control card, enabling operations such as calibration and parameter adjustment when used with an engineering card. A long press (5 seconds) resets the channel's maximum/minimum concentration values, STEL/LTEL timing, and time-delay relay status.

Compatibility Expansion

Supports external connection of the 05701-A-0285 analog output module (optional), which can provide 0-20mA or 4-20mA isolated current loop output. It is used to connect external devices such as chart recorders and PLCs (Programmable Logic Controllers) to achieve secondary data storage or remote monitoring.

Engineering Card Linkage Configuration

Through the Honeywell Engineering Card (Part Number: 05701-A-0361), operations such as zero calibration (ZERO), span calibration (SPAN), alarm threshold adjustment, and system clock setting can be performed on the control card. It also supports connection to a computer via an RS232 interface, using engineering software for complex parameter configuration (such as alarm types, relay action modes).

二、Hardware Specifications and Environmental Adaptability

1. Hardware Parameters

2. Environmental Adaptability

• Operating Temperature: -5℃ to +55℃ (0℃ to +55℃ for ATEX-certified systems), meeting the requirements of most industrial indoor environments.
• Storage Temperature: -25℃ to +55℃, facilitating transportation and inventory management.
• Humidity: 0-90% RH (non-condensing), adaptable to high-humidity industrial scenarios (such as chemical workshops and storage warehouses).
• EMC (Electromagnetic Compatibility): Complies with EN 50270:2006 standard and EMC Directive 2004/108/EC. It has anti-electromagnetic interference capability and can work stably in complex electromagnetic environments such as motors and high-voltage equipment.
• Protection Design: Supports shielded grounding of sensor cables, reducing the impact of RFI (Radio Frequency Interference) on signals and ensuring the stability of data acquisition.

Application Scenarios and Selection Recommendations

1. Application Scenarios

• Combustible Gas Monitoring: Used for monitoring the concentration of methane, propane, etc. in petrochemical workshops. It works with combustible gas sensors with 4-20mA output to realize real-time monitoring and graded alarm of LEL (Lower Explosive Limit) concentration.
• Toxic Gas Monitoring: Applied to monitor carbon monoxide and hydrogen sulfide in metallurgical plants, or chlorine and ammonia in chemical plants. It connects to toxic gas transmitters to trigger STEL/LTEL (Short-Term Exposure Limit/Long-Term Exposure Limit) alarms in a timely manner and protect personnel health.
• High-Integrity Systems: Suitable for key area monitoring in nuclear power plants and large-scale storage tank areas. It can improve system reliability through independent power supply and high-integrity relay card configuration, meeting strict safety requirements.

2. Selection Considerations

• Sensor Signal Matching: Only applicable to sensors with 4-20mA input. If using catalytic combustion sensors (such as the model compatible with Honeywell 05701-A-0302 control card), the corresponding catalytic input control card must be selected, and mixing is not allowed.
• System Scalability: For multi-channel centralized management, 16-channel or 8-channel racks can be selected according to the number of monitoring points. A single rack can hold a maximum of 16 pieces of 05701-A-0301 control cards (1 engineering card slot needs to be reserved).
• Environmental Adaptability: Only for indoor use and cannot be exposed to rain, moisture or corrosive environments. If used in high-temperature and high-humidity scenarios, ensure the installation environment meets the requirements of -5℃ to +55℃ and 0-90% RH (non-condensing).

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