FOXBORO RH916YY

FOXBORO RH916YY

Product Overview
The FOXBORO RH916YY is a humidity sensor designed for industrial and laboratory environments. It measures relative humidity and provides a standard analog output signal for connection to control systems, data loggers, or monitoring instruments. The sensor is built for continuous operation in environments where accurate humidity measurement is required.

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Description

FOXBORO RH916YY

Technical Specifications

  • Manufacturer: FOXBORO
  • Product Type: Humidity sensor
  • Measurement Range: 0 percent RH to 100 percent RH
  • Measurement Accuracy: ±2 percent RH
  • Output Signal: 4 mA to 20 mA
  • Power Supply: 12 V DC to 36 V DC
  • Operating Temperature: -40 °C to 85 °C
  • Protection Rating: IP67
  • Housing Material: Stainless steel
  • Cable Length: 2 m standard, with customization available
  • Mounting Style: Flange mounting

Functional Features

  • Full-range relative humidity measurement from 0 percent RH to 100 percent RH.
  • ±2 percent RH measurement accuracy.
  • Standard 4 mA to 20 mA analog output.
  • Wide operating temperature range from -40 °C to 85 °C.
  • IP67 protection against dust and water ingress.
  • Stainless steel housing for corrosion resistance.
  • Flange mounting for secure installation.
  • Suitable for integration with PLC, DCS, and instrumentation systems.
  • Designed for continuous process and environmental monitoring.

Application Scenarios

  • Pharmaceutical production areas.
  • Food processing and storage environments.
  • Laboratory humidity monitoring.
  • HVAC system verification.
  • Cleanroom environmental control.
  • Weather and environmental measurement stations.
  • Warehouse humidity monitoring.
  • Industrial drying processes.
  • Moisture-sensitive material storage.
  • Process air quality monitoring.

Performance Parameters

  • 0 percent RH to 100 percent RH measurement range.
  • ±2 percent RH accuracy.
  • 4 mA to 20 mA output signal.
  • 12 V DC to 36 V DC supply voltage.
  • -40 °C to 85 °C operating temperature.
  • IP67 ingress protection.
  • Stable output suitable for control and monitoring loops.

Material Composition

  • Stainless steel sensor housing.
  • Humidity sensing element inside the protective assembly.
  • Signal conditioning electronics.
  • Industrial cable with standard 2 m length.
  • Flange mounting hardware.
  • Sealing elements to support IP67 protection.

Structural Features

  • Compact stainless steel body.
  • Flange mounting interface for fixed installation.
  • Protected sensing area for reliable humidity detection.
  • Integrated cable for direct connection to instrumentation.
  • Robust housing suitable for humid or washdown-prone areas.
  • Industrial-grade connector or cable exit design.

Working Principle
The RH916YY senses the moisture content in the surrounding air using its internal humidity sensing element. The sensed humidity is converted into an electrical signal by the onboard conditioning circuit. The sensor then outputs a proportional 4 mA to 20 mA current signal that represents the measured relative humidity. The 4 mA lower limit typically corresponds to 0 percent RH, and the 20 mA upper limit corresponds to 100 percent RH, unless otherwise configured. The receiving instrument reads this current signal and displays or controls the process humidity value.

Installation Requirements

  • Install the sensor in a location that represents the humidity to be measured.
  • Avoid direct exposure to condensation, standing water, or chemical sprays unless the application specifically allows it.
  • Mount the sensor securely using the flange interface.
  • Ensure adequate air circulation around the sensing area.
  • Connect the 4 mA to 20 mA output to a compatible analog input channel.
  • Supply 12 V DC to 36 V DC power with correct polarity.
  • Verify cable routing to prevent mechanical damage.
  • Allow stabilization time after installation before relying on measurements.
  • Perform calibration checks according to plant procedures.

Precautions for Use

  • Do not exceed the 36 V DC supply voltage.
  • Do not expose the sensor to conditions beyond its IP67 rating for extended periods.
  • Avoid contamination of the sensing element by oil, dust, or corrosive chemicals.
  • Verify wiring polarity before powering the sensor.
  • Use shielded cable if the installation environment has high electrical noise.
  • Perform periodic calibration to maintain measurement accuracy.
  • Do not use the sensor for safety instrumented functions unless formally qualified for that purpose.
  • Inspect the housing and cable regularly in harsh environments.

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