Temperature and Humidity Transmitter
for Humidity Test Chambers
Precision Monitoring Solution for Environmental Test Equipment and Constant temperature and humidity chamber
Why Temperature and Humidity Transmitters Are Essential for Humidity Test Chambers
Ensuring Precision and Stability in Every Climate Simulation
In humidity test chambers, maintaining stable and accurate environmental conditions is critical for reliable testing outcomes. Temperature and humidity transmitters play a central role by providing precise, real-time monitoring and feedback control. Here’s why they are indispensable:
Ensure Accurate Environmental Control
Continuously measure and transmit real-time temperature and humidity data to maintain tight control over test conditions.Improve Test Reliability and Reproducibility
Help ensure that every test is conducted under consistent conditions, reducing variability and increasing data reliability.Enable Automated Feedback Systems
Work with the chamber’s control system to automatically adjust heating, cooling, humidification, or dehumidification processes.Support Compliance with Testing Standards
Provide the accuracy and traceability required to meet ISO, ASTM, or industry-specific testing protocols.Protect Sensitive Products and Materials
Prevent exposure to unintended environmental deviations, especially important for electronics, pharmaceuticals, and composites.Facilitate Data Logging and Quality Audits
Allow seamless integration with data acquisition systems for recording, traceability, and documentation.
Technical Requirements for Temperature and Humidity Transmitters in Climate Chambers
✅ 1. Accuracy and Stability (Core Indicators)
| Requirement Item | Description |
| Temperature Accuracy | Typically ±0.1℃ to ±0.2℃; higher precision for pharmaceutical testing |
| Humidity Accuracy | At least ±1.5%RH; high-end tests require ±1.0%RH or even ±0.8%RH |
| Long-Term Stability | One year or longer with minimal drift, reducing recalibration |
| Response Time | Humidity response time ≤10 seconds for fast system feedback |
| Drift Control | Annual drift ≤1.0%RH to ensure test consistency |
✅ 2. High-Humidity Operating Capability
| Requirement Item | Description |
| High-Humidity Endurance | Reliable under 90–95%RH or near-saturation for extended periods |
| Anti-Condensation Design | Coating or heater on sensor surface to prevent condensation |
| Corrosion Resistance | Resistant materials required for pharma, chemical, and defense chambers |
✅ 3. Mechanical Design & Installation
| Requirement Item | Description |
| Compact/Custom Design | Small form factor or OEM dimension options for tight space |
| Installation Method | Supports wall-mount, embedded, threaded, flanged, or snap-in installation |
| Sealing Performance | High-sealing at probe interface to maintain chamber air tightness |
| Replaceable Probe | Quick-plug for easy maintenance or replacement without full teardown |
✅ 4. Output & System Compatibility
| Requirement Item | Description |
| Output Type | Supports 4–20mA, 0–10V, RS485 Modbus RTU and other industrial standards |
| Anti-Interference Design | Shielded signal cables to ensure stable transmission |
| Calibration Support | Multi-point or field calibration supported for long-term precision |
Why HENGKO's Temperature and Humidity Transmitters are Your Best Choice in Climate Chambers
HG808-H Vs HG808-C Pro Feature Comparison
| What We Can Do for You | HG808-H: Solution | HG808-C Pro: Solution |
| 1. Failure in high humidity environments | Designed for 40–95%RH; supports long-term operation in high humidity. Anti-condensation and anti-mold design with high protection rating to avoid moisture ingress. | Also supports stable high humidity operation. Optimized internal structure with strong anti-drift capability. |
| 2. Inadequate humidity accuracy affects control | Provides ±2%RH accuracy, suitable for general high-humidity control requirements. | ±0.8%RH ultra-high accuracy, ideal for pharmaceutical stability testing and precise electronics testing. |
| 3. Difficult probe installation | Supports various probe forms: direct insertion, extended hose, flange mount. OEM customization for embedded use. | Offers compact probe version for tight or sealed chamber installations. |
| 4. Signal compatibility issues | Supports analog (4–20mA / 0–5V / 0–10V) + Modbus RTU / RS485; compatible with PLC, environmental monitoring, and industrial control systems. | Same support with dual output, adaptable to different systems. |
| 5. Complex maintenance, long cycle | Industrial-grade housing: dust-proof, corrosion-resistant, long maintenance-free period. Probe can be calibrated or replaced. | Minimal accuracy drift, supports multi-point calibration, reduces maintenance cost. |
| 6. Cost control and delivery issues | Uses domestic components. 40–60% cost savings compared to Rotronic/Vaisala. Fast OEM delivery. | Also cost-effective and suitable as a high-precision domestic alternative. |
HG808 Series - Application Matching
| Application Positioning | Product | Recommended Use Scenarios |
| High-Humidity Specialized Model (Cost-Effective) | HG808-H | High-humidity fermentation chambers, food steam cabinets, constant temperature and humidity chambers, environmental aging chambers |
| High-Precision Humidity Control (Imported Alternative) | HG808-CPro | Pharmaceutical stability test chambers, electronic temperature & humidity reliability test chambers, high-precision inspection chambers |
Duct Humidity Temperature Sensor
HENGKO offers a wide range of temperature and humidity sensors for every need, from stainless steel temperature and humidity sensor probes to dew point transmitters. Our sensors are accurate, reliable, and durable, making them ideal for a wide range of applications
4.1 Dew Point RS485 - Integrated Duct Probe Series
HENGKO offers a wide range of temperature and humidity sensors for every need, from stainless steel temperature and humidity sensor probes to dew point transmitters. Our sensors are accurate, reliable, and durable, making them ideal for a wide range of applications
✅ HG808-H
- High-Wet / High Humidity Condition 98% RH Humidity Transmitter
Engineered for constant operation in high-humidity environments, clean rooms, and swimming pools. - Continuous high humidity environment >85%RH, accurate and long-life operation
What Process of Constant temperature and humidity chamber need to Monitor Temperature and Humidity ?
Monitoring temperature and humidity is essential at multiple stages of the operation of a constant temperature and humidity chamber (climate chamber) to ensure accurate simulation of environmental conditions and compliance with testing standards. The key processes that require real-time temperature and humidity monitoring include:
1. Environmental Conditioning / Pre-Stabilization
Purpose: To bring the chamber environment to the target temperature and humidity setpoint before introducing test samples.
Monitoring Role: Sensors verify that the chamber has reached the desired stable condition (e.g., 25°C ±0.2°C / 60%RH ±2%RH) before testing begins.
2. Sample Testing / Soak Period
Purpose: To expose materials, products, or components to precise and stable environmental conditions over a defined duration.
Monitoring Role: Continuous feedback from temperature and humidity transmitters allows the control system to make fine adjustments. This ensures uniformity and prevents deviations that could invalidate test results.
3. Data Logging and Validation
Purpose: To record environmental data for quality assurance, regulatory compliance (e.g., FDA, ICH, ISO), and traceability.
Monitoring Role: Transmitters provide high-resolution, time-stamped data to the chamber’s data logger or external system to verify environmental conditions throughout the test duration.
4. Closed-Loop Control Operation
Purpose: To automatically regulate heating, cooling, humidification, and dehumidification systems.
Monitoring Role: Real-time data from the sensors is used by the PID control algorithm to maintain tight environmental tolerances, responding to internal or external fluctuations.
5. Alarm & Fault Detection
Purpose: To detect deviations or failures (e.g., heater/humidifier malfunctions or door leaks).
Monitoring Role: The transmitter triggers alarms when temperature or humidity values fall outside of acceptable limits, helping prevent damage to test samples and ensuring system reliability.
6. Calibration and Maintenance Feedback
Purpose: To maintain sensor performance over time and ensure test validity.
Monitoring Role: Monitoring trends in sensor drift or inconsistency helps schedule timely recalibration and reduce unplanned downtime.
5-Factors You Should Care When Choose Humidity Transmitter for Your Constant temperature and humidity chamber ?
Here are 5 factors you should consider when buy a humidity transmitter for your Climate Chambers:
1. High Accuracy & Stability
Look for ±1.0%RH or better and ≤1%RH/year drift to ensure reliable test data.
2. High-Humidity Resistance
Must operate long-term in 90–95%RH. Anti-condensation coating and corrosion-resistant housing are essential.
3. Fast Response Time
Response ≤10s helps maintain tight control via closed-loop feedback systems.
4. Signal Compatibility
Supports 4–20mA, 0–10V, or RS485 Modbus to fit your control and monitoring systems.
5. Easy Installation & Maintenance
Compact probes, replaceable elements, and field calibration save time and reduce downtime.
FAQ
What is the role of a temperature and humidity transmitter in a humidity test chamber?
A temperature and humidity transmitter is a critical component in humidity test chambers, responsible for accurately monitoring and transmitting real-time environmental data. It helps maintain the desired climate conditions by feeding precise temperature and humidity readings to the chamber’s control system. This ensures consistency, repeatability, and compliance with testing standards, especially in industries like pharmaceuticals, electronics, and materials testing.
How accurate should a humidity transmitter be for stability and reliability testing?
For high-reliability applications such as pharmaceutical stability testing or electronic component reliability, humidity transmitters should offer an accuracy of ±1.0%RH or better, with premium models achieving ±0.8%RH. Temperature accuracy should typically be within ±0.1°C to ±0.2°C. The sensor must also demonstrate low drift over time (≤1.0%RH/year) and fast response times (≤10 seconds) to meet strict control requirements.
What are the common failure risks of humidity transmitters in high-humidity environments?
Common failure risks include:
Condensation buildup on the sensor element, causing reading errors or corrosion.
Microbial growth due to prolonged exposure to high moisture.
Signal drift or loss of calibration over time.
Ingress of water vapor damaging internal electronics.
To mitigate these risks, industrial-grade transmitters are designed with anti-condensation coatings, sealed housings, sensor heaters, and corrosion-resistant materials (e.g., 316L stainless steel or PBT enclosures).
Can I use standard HVAC humidity transmitters in a climate chamber?
No, standard HVAC humidity transmitters are typically not suitable for the rigorous and high-humidity operating conditions of climate or test chambers. They often lack the necessary:
Measurement accuracy
Environmental sealing
Condensation protection
Long-term stability
Industrial or laboratory-grade transmitters are specifically designed to operate in 90–95%RH, with strong resistance to drift, corrosion, and electrical interference, making them essential for reliable test chamber operation.
What output signals are best for integrating with test chamber control systems?
The most commonly used output signals include:
Analog outputs: 4–20mA or 0–10V, suitable for direct connection with PLCs or analog controllers.
Digital outputs: RS485 with Modbus RTU protocol, allowing for long-distance, multi-point data collection and integration with modern data logging systems.
A dual-output model (e.g., analog + Modbus) is often preferred for flexible integration and redundancy.
How often should a temperature and humidity transmitter be calibrated in a humidity test chamber?
Calibration frequency depends on the application, sensor stability, and regulatory requirements. In general:
High-precision applications (e.g., pharmaceutical stability chambers): calibrate every 6–12 months.
General industrial use: annual calibration may suffice if the sensor is stable.
Choose transmitters with low drift specifications, multi-point calibration support, and field calibration options to minimize downtime and ensure traceability.
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HENGKO is a global leader in industrial sensor solutions, with a reputation for unique design and excellent performance. Our temperature and humidity transmitter and sensor are used in a wide range of industries, including food and beverage, pharmaceutical, manufacturing, and environmental monitoring.
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