The HONEYWELL LG1093AC01 is a high-performance, loop-powered, field-mountable LCD process indicator, a versatile and robust component within Honeywell’s extensive instrumentation portfolio. This device is designed to provide a clear, local digital display of process variables in demanding industrial environments where a remote control room display is insufficient or where local operator visibility is critical. It directly connects into a standard 4-20 mA two-wire current loop, drawing its minimal operating power from the loop current itself, and displays the corresponding engineering units (e.g., PSI, °C, GPM, %) with high accuracy. The HONEYWELL LG1093AC01 serves as a cost-effective and reliable solution for on-the-spot monitoring of pressure, temperature, level, flow, or any other variable transmitted by a 2-wire transmitter. Its compact, rugged housing is engineered for direct field mounting near the measurement point, on pipe racks, or on equipment skids, providing instant process visibility to operators, technicians, and maintenance personnel.
The value of the HONEYWELL LG1093AC01 lies in its simplicity, durability, and elimination of separate wiring. By being loop-powered, it requires no external power supply, significantly simplifying installation and reducing costs—only two wires are needed for both signal and power. The large, high-contrast LCD is easily readable in a wide range of lighting conditions, from bright sunlight to low-light areas. With a high ingress protection rating, it withstands harsh conditions including rain, dust, and corrosive atmospheres. For facilities using Honeywell’s Experion PKS or other distributed control systems, this indicator provides a trusted, consistent local readout that complements the central control room display, enhancing situational awareness, aiding in field verification during operations, and serving as a crucial backup during system checks or control system maintenance.
Technical Specifications
Parameter Name
Parameter Value
Product Model
HONEYWELL LG1093AC01
Manufacturer
Honeywell Process Solutions
Product Type
Loop-Powered LCD Process Indicator
Display
High-contrast, 4+ digit LCD with annunciator symbols
Input Signal
4 to 20 mA DC, two-wire, loop-powered
Power Supply
Loop-powered (operates on signal current, requires min. 3.8 mA)
Accuracy
Typically ±0.1% of reading ±1 digit (at 25°C/77°F)
Update Rate
Approx. 2 updates per second
Scaleability
User-configurable via magnetic wand (included) or communicator; linear scaling for any engineering unit
Burnout Protection
Upscale or downscale indication on sensor burnout (configurable)
Operating Voltage Drop
Low voltage drop (typically < 3.5V at 20 mA) to ensure sufficient loop voltage for transmitter
Housing Material
Polycarbonate or fiberglass-reinforced polyester
Window Material
Impact-resistant lens
Protection Rating
NEMA 4X / IP65 (dust-tight and protected against water jets)
Ambient Temperature
-40°F to 185°F (-40°C to 85°C) for display; -58°F to 185°F (-50°C to 85°C) for electronics
Process Connection
Integral mounting bracket; electrical connection via conduit or cable gland (not included)
Key Features and Advantages
The defining feature of the HONEYWELL LG1093AC01 is its true loop-powered operation and exceptional ease of installation. By eliminating the need for a separate power source, it drastically reduces installation complexity and cost. It can be added to any existing 4-20 mA loop without requiring additional wiring runs or power supplies, making it an ideal retrofit or upgrade for enhancing field visibility. Its ultra-low voltage drop is crucial, as it ensures that the indicator does not «steal» too much voltage from the loop, leaving ample headroom for the transmitter to operate correctly, especially over long cable runs.
LG1093AC01
Outstanding readability and robust field construction set it apart. The high-contrast LCD with large digits is easily legible from a distance and in direct sunlight, a common challenge in outdoor installations. The NEMA 4X / IP65 rated enclosure is completely sealed against dust and water ingress from hose-directed water, making it suitable for installation in washdown areas, outdoors, or in corrosive industrial environments. This durability ensures a long service life with minimal maintenance. Simple, tool-free configuration is achieved using the included magnetic wand. By holding the wand near the designated spot on the housing, the user can access the configuration menu to set the display range (4 mA and 20 mA corresponding values), decimal point location, and engineering units, all without opening the enclosure—preserving its integrity and hazardous area ratings.
Versatility and reliability make it a universal field asset. It is compatible with any 4-20 mA signal source, regardless of manufacturer. Its burnout indication feature provides an immediate visual alert (e.g., display of «—-» or a configurable value) if the field transmitter fails or the signal wires break. The HONEYWELL LG1093AC01 provides a cost-effective, reliable, and maintenance-free solution for putting critical process information directly where it’s needed—in the field—thereby improving operational efficiency, safety, and troubleshooting speed.
Application Areas
The HONEYWELL LG1093AC01 finds universal application across all process industries wherever a local, reliable display of a 4-20 mA signal is required. In oil & gas production, it is commonly mounted on wellhead manifolds, pipeline skids, and separator vessels to display pressure, temperature, and level locally for field operators.
Within chemical and petrochemical plants, it is installed on reactor feed lines, distillation column bases, storage tank farms, and utility headers (steam, cooling water) to provide instant readouts for operators making rounds or performing adjustments. Its ruggedness makes it suitable for harsh chemical environments. In water and wastewater treatment facilities, the indicator is used on pump discharge headers, filter pressure gauges, and chemical dosing lines, providing clear visibility for maintenance crews and operators.
For power generation plants, it serves as a local indicator for auxiliary system pressures and temperatures on turbines, boilers, and condensers. In HVAC systems for large buildings or industrial facilities, it can display chilled water supply temperature or differential pressure across filters. Essentially, the HONEYWELL LG1093AC01 is the ideal choice for any location where mounting a traditional gauge is insufficient (needing digital precision) and running separate power for a display is impractical or costly. It brings the control room data directly to the point of action.
Related Products
HONEYWELL LG Series other models (e.g., LG1193): Similar loop-powered indicators, possibly with different display sizes (e.g., 6-digit), display colors (e.g., red), or specific features like dual displays.
HONEYWEWELL STT3000 / STT3500 Smart Temperature Transmitters: A Honeywell transmitter whose 4-20 mA output could be displayed by the LG1093AC01.
HONEYWELL PT / PU Pressure Transmitters: Another source of 4-20 mA signals suitable for display on this indicator.
Line-powered LCD Indicators (e.g., Honeywell UDC series controllers with display): Devices that require separate AC/DC power but offer control functionality in addition to display.
Analog Panel Meters (moving coil): Traditional, non-digital alternatives for local indication.
HART Communicator (e.g., Honeywell HHC): A handheld device used to configure smart transmitters in the loop, which may also be used for advanced configuration of some loop-powered indicators.
Explosion-proof Enclosures (if needed for Div. 1 / Zone 1 areas): An external enclosure to house the LG1093AC01 if installed in a more hazardous area than its NEMA 4X rating covers.
Mounting Brackets and Hardware: Various brackets for pipe, wall, or panel mounting.
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