Honeywell HNS50049911‑001 Transmitter LCD Display Module

Product Description

HNS50049911‑001 is a plug‑in local LCD display assembly exclusively for Honeywell SmartLine ST800 series pressure and temperature transmitters. It is installed inside the transmitter housing, provides on‑site local readout for process variable, engineering units, sensor status and diagnostic alarms. It communicates via HART protocol with the transmitter mainboard, adopts compact circular form factor for direct field replacement, widely used for local indication of SmartLine transmitters in process plant.

Product Functions

• Local on‑site display of measured process value: pressure, temperature and differential pressure readings.
• Display engineering unit tags, percentage range, sensor fault codes and diagnostic alarm information.
• HART bus communication interface to exchange data with ST800 transmitter main circuit board.
• Plug‑and‑play modular structure, support quick replacement without re‑calibration of transmitter.
• Backlight LCD for clear reading under both dim light and bright field environment.
• Supports local menu navigation for simple parameter view without handheld communicator.
• Low‑power consumption design, powered directly from transmitter loop without extra power supply.

Application Scenarios

• Petrochemical and refinery site for ST800 pressure/temperature transmitter local indication.
• Oil & gas processing unit field instrument installation and on‑site inspection work.
• Chemical plant, power plant auxiliary loop measurement points with on‑site reading requirement.
• Pulp‑paper, water‑wastewater treatment using Honeywell SmartLine transmitter instruments.

• Spare‑part replacement and field repair for existing ST800 transmitter fleet.

  
  

Common Problems & Troubleshooting

• LCD screen blank, no display: Check display module seating and connector contact inside transmitter housing; verify 4‑20mA loop current meets minimum operating requirement.
• Screen flicker or intermittent display loss: Inspect internal connector for corrosion, dirt or loose contact caused by vibration; re‑seat display assembly.
• Transmitter works normally but display shows garbled characters: Confirm display firmware compatibility with ST800 transmitter electronics; replace faulty display module.
• Display cannot update measured value: Check HART internal communication contact; confirm transmitter mainboard works correctly, fault may come from transmitter electronics rather than display.
• Backlight not working: Verify loop current value; backlight function will be disabled under insufficient loop power condition.
• Condensation damage inside display: Check transmitter housing seal integrity; prevent moisture ingress in high‑humidity field environment.