FLP/ Explosion proof Temperature and Humidity Transmitter with Display
A. Product overview
The FLP / Explosion-Proof Temperature & Humidity Transmitter with Display is built for continuous relative humidity (RH) and temperature monitoring in Zone 1 and Zone 2 hazardous areas. It measures 0–100% RH and 0–100°C and provides a standard 4–20 mA output for integration with PLC, DCS/SCADA, and building automation systems. The unit operates on 10–30 VDC and is designed for safe, reliable performance with full isolation between the power supply, measuring circuit, and output stage. Housed in a rugged IP65 flameproof (FLP) enclosure with a clear local display, it is suitable for refineries, chemical plants, gas skids, and solvent or flammable storage areas.
B. Working principle
Sensing: Internal sensing elements continuously measure ambient humidity and temperature in the surrounding air.
Signal processing: The electronics condition, linearize, and scale the sensor signals to provide stable readings across the measurement ranges.
Electrical isolation: The power input, measuring circuitry, and 4–20 mA output are electrically isolated to improve safety, reduce interference, and protect connected control systems in industrial environments.
Output conversion: The measured RH/temperature values are converted into a 4–20 mA signal for monitoring, alarms, and control actions in automation systems.
Local indication: The built-in display shows RH and temperature on-site for quick verification during commissioning and maintenance.
C. Why it is used
Continuous RH and temperature monitoring in hazardous locations where safety compliance is required
Reliable 4–20 mA output for PLC/DCS/SCADA/BMS integration, trending, and alarms
Helps protect equipment, materials, and process quality by monitoring environmental conditions
Full isolation improves system reliability and reduces noise, ground loops, and signal disturbances
IP65 flameproof enclosure supports harsh industrial installation conditions
Local display reduces troubleshooting time and helps with quick field validation
D. Suitable buyers
Refineries and petrochemical plants (instrumentation and maintenance teams)
Chemical manufacturing and solvent handling plants
Oil & gas EPC contractors and hazardous-area system integrators
OEMs making gas skids, compressor skids, and packaged process skids
Storage terminals and tank farms handling fuels/solvents/flammables
Industrial automation integrators (PLC/DCS/SCADA) working in hazardous zones
Facility teams responsible for hazardous utility rooms and flammable storage areas
FAQ
1. What is an FLP (explosion-proof) temperature and humidity transmitter?
It is a temperature and humidity transmitter housed in a flameproof enclosure designed for hazardous areas to safely monitor RH and temperature and send signals to control systems.
2. Is this transmitter suitable for Zone 1 and Zone 2 hazardous areas?
Yes. It is intended for Zone 1 and Zone 2 installations where flammable gases may be present.
3. What output signal does it provide?
It provides a 4–20 mA output signal, commonly used in industrial automation for reliable transmission and controller compatibility.
4. What are the measurement ranges and accuracy?
Humidity: 0–100% RH with ±3% RH accuracy (default).
Temperature: 0–100°C with ±0.5°C accuracy (default).
5. What power supply is required?
It operates on 10–30 V DC, typically powered from 24 V DC control panel supplies.
6. Why is isolation important in hazardous-area transmitters?
Isolation improves safety and reliability by reducing electrical noise, preventing ground loop issues, and protecting connected PLC/DCS inputs.
7. Where is this product commonly used?
It is commonly used in refineries, chemical plants, gas skids, and solvent or flammable storage areas for continuous monitoring and automation integration.
8. What is the benefit of the local display?
The display allows on-site verification of RH and temperature without relying on the control system, helping during commissioning and maintenance.