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05704-A-0145

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The Honeywell 05704-A-0145 is a microprocessor-controlled Four Channel Control Card designed for 4–20mA inputs, providing integrated control, display, and alarm facilities for up to four gas detectors.
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Technical specifications for 05704-A-0145

  • Manufacturer:
    Honeywell
  • Part Number:
    05704-A-0145
  • Product Family:
    Honeywell Safety Systems
  • Product Type:
    Control Card
  • Power Consumption:
    7.5W (Typical) / 8.3W (Maximum)
  • Measurement Signal Range:
    0 to 25mA (Linear)
  • Loop Powered Output Voltage:
    Isolated 24V ± 5% regulated
  • Max Loop Current:
    25mA maximum (for loop-powered devices)
  • Transmitter Supply Output:
    None
  • Loop Protection:
    Short circuit and open circuit protection (±50V)
  • Configuration:
    Sensor current source
  • Maximum Line Resistance:
    500 ohms (loop resistance including sensor)
  • Isolation Breakdown Voltage:
    > ±50V DC to system 0V
  • Weight:
    0.16 kg
  • Estimated shipping dimensions:
    2.5x17x12.7cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Applications Certifications Compatibility & Interoperability

Features:

  • Four-Channel Control Interface for 4-20mA Gas Detection Loops
  • Integrates Signal Processing, Display, and Alarm Functions for Up to Four Detectors
  • Compatible with 4-20mA Input Gas Detectors and Optional Analogue Output Modules
The HONEYWELL 05704-A-0145 operates as the Four Channel Control Card 4-20mA in a gas detection system, providing comprehensive control, display, and alarm facilities for up to four connected gas detectors. It continuously processes incoming 4-20mA sensor signals, drives the connected sensors with necessary voltages and currents, and displays signal levels one at a time on the front panel liquid crystal display. Seamless alarm indication is standard with the 05704-A-0145, and using optional Analogue Output Modules will allow remote output of channel card readings with either current source or current sink configurations as required. The 05704-A-0145 has made improvements in configurability over previous designs in addition to incorporating fully definable microprocessor-controlled operation for a wide range of connected gas detectors and application requirements.

The 05704-A-0145 provides essential control functions for up to four loops of gas detection, and is a critical component of the safety monitoring path, directly affecting the proper, normal operation of the overall gas detection system. One 05704-A-0145 control card is required per set of four gas detection channels. The 05704-A-0145 occupies a dedicated slot in the rack and features a front panel backlit display along with LEDs for alarm indication and a push-button for alarm reset and Engineering Card selection.

For multi-channel gas detection applications, the system requires the 05704-A-0145 control card installed to manage the connected 4-20mA gas detectors. In addition to standard single card operation, the 05704-A-0145 performs continuous self-validation. The 05704-A-0145 executes self-monitoring using its internal microprocessor and stored EEPROM configuration. Using this method, the control card continually monitors the health of its circuit components, software operation, and sensor condition. If the 05704-A-0145 detects that a pre-defined alarm limit is exceeded, it will automatically raise alarms by lighting up front panel LEDs and operating connected relays, and inform other cards with the alarm status information.

The 05704-A-0145 HONEYWELL  Four Channel Control Card may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
HONEYWELL 05704-A-0145 Four Channel Control Card Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
HONEYWELL 05704-A-0145 Four Channel Control Card Catalytic Specs

General

  • Manufacturer HONEYWELL
  • Model 05704-A-0145
  • Condition New Original ready stock
  • Product Family 05704-A-0144,05704-A-0121,05704-A-0131
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Petrochemical & Oil/Gas: Monitoring for hazardous leaks in storage tank farms, refineries, and along pipelines.
  • Manufacturing & Workshops: Detecting toxic or flammable gas buildup (e.g., carbon monoxide, methane, or chlorine) in factory environments.
  • Environmental & Municipal: Monitoring sewage treatment plants and landfills for explosive or harmful gases.
  • Indoor Air Quality: Used in industrial HVAC and large-scale facilities to ensure breathable air standards.
  • EMC Compliance: Tested for electromagnetic compatibility to ensure stable operation near other industrial equipment.
  • Hazardous Area Certifications: When used in a complete system, it supports installations requiring ATEX, IECEx, UL, and CSA certifications for explosive atmospheres.
  • Quality Standards: Manufactured under ISO quality management protocols.
  • Sensor Compatibility: Works with any standard industrial gas detector that provides a 4-20mA current loop output, including flame, smoke, and heat detectors.
  • Rack System Interoperability: Fits into standard 19-inch (up to 64 channels) or half 19-inch (up to 32 channels) sub-racks. It can be "freely mixed" in the same rack as the 05704-A-0144 (catalytic version) or fire control cards.
  • Interface Modules: Connects to Quad Relay Interface Cards for field wiring and relay outputs. Optional analogue output modules can be added for isolated 0–20mA or 4–20mA remote monitoring.
  • DCS/PLC Integration: Supports digital communication via an optional Modbus RS-485 serial module, allowing it to be monitored and configured by external SCADA, DCS, or PLC systems.
  • Maintenance: Requires a System 57 Engineering Card for initial setup, calibration, and performance diagnostics.
Description
The HONEYWELL 05704-A-0145 Four Channel Control Card 4-20mA is specifically designed for industrial gas detection systems that utilize 4-20mA input gas detectors. The 05704-A-0145 provides comprehensive control, display, and alarm facilities for up to four connected gas detectors operating on the industry-standard 4-20mA signal format. The front panel of the 05704-A-0145 features a backlit display that clearly indicates gas readings, channel status, and channel numbers, while dedicated LEDs provide immediate visual alarm indication. A push-button on the 05704-A-0145 enables operators to reset alarms and select the card for use with the Engineering Card during system configuration and maintenance.

The 05704-A-0145 is microprocessor-controlled and offers fully definable operation to accommodate a wide range of connected 4-20mA gas detectors and diverse application requirements. All software configuration settings for the 05704-A-0145 are securely stored in an EEPROM, ensuring that operational parameters are retained even during power interruptions. This makes the 05704-A-0145 particularly suitable for critical safety applications where configuration consistency is essential.

The HONEYWELL 05704-A-0145 carries out essential control functions for up to four loops of gas detection. The 05704-A-0145 provides the necessary voltages and currents to drive the connected 4-20mA sensors, processes the incoming sensor signals, and displays signal levels one at a time on the front panel liquid crystal display. The 05704-A-0145 compares each channel signal level with pre-defined alarm limits, and when these limits are exceeded, the 05704-A-0145 raises alarms by lighting up front panel LEDs and operating connected relays. Additionally, the 05704-A-0145 informs other system cards with alarm status information and continuously performs self-validation of its circuit components, software operation, and sensor condition.

Optional Analogue Output Modules can be plugged into the 05704-A-0145 to provide remote output of channel card readings, with one module required per channel. Different module types are available for the 05704-A-0145 to permit either current source or current sink configurations as required by the specific installation. This HONEYWELL 05704-A-0145 Four Channel Control Card 4-20mA is specifically designed for environments where 4-20mA gas detectors are deployed, making it ideal for industrial facilities, chemical plants, oil and gas installations, and manufacturing operations where standardized analog signal transmission is preferred for reliable long-distance communication between gas detectors and the control system.
Alternative Names
05704-A-0144 05704-A-0121 05704-A-0131
Technical notes
The 05704-A-0145 features a front-panel backlit LCD for gas readings and LED alarms, with configuration data securely stored in an EEPROM. The module, which supports optional Analogue Output Modules for remote readings, ensures system integrity through self-validation of its circuits, software, and sensor health.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What functions does the 05704-A-0145 perform in a gas detection system?
The module supplies the required voltage and current to connected sensors, processes incoming 4–20mA signals, and displays readings on the LCD. It continuously compares signal levels against predefined alarm thresholds and triggers alarms via LEDs and relays when limits are exceeded.
How does the 05704-A-0145 handle alarms and system monitoring?
When gas concentrations exceed set limits, the module activates visual alarms and relay outputs. It also communicates alarm status to other system components and performs continuous self-diagnostics, monitoring its circuitry, software, and sensor conditions to ensure system integrity.
What makes the 05704-A-0145 suitable for critical safety applications?
Its combination of programmable control, reliable signal processing, alarm management, EEPROM-based configuration storage, and continuous self-checking ensures high system reliability, making it well-suited for environments where safety and consistency are essential.

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