- Product information
- Focusens Solution
- Typical Application
- Technical Specifications & Selection Guide
- How Do We Control Quality?
- Are You Facing Any of These Temperature Sensor Problems?
- Why Choose Our Temperature & Humidity Transmitter?
- Frequently Asked Questions
- Purchase history
- Customer Reviews
- Buyers Q & A
Model：FHT20 Series
Key Feature：Dual Parameter Measurement
MOQ(Standard)：500 pcs
MOQ(Customized)：TBD
Fucusens Solution
One Transmitter for Temperature, Humidity and Standard Analog Output
Environmental monitoring systems often need more than just a sensing element. The complete transmitter must match Temperature Range + Humidity Range + Output Signal + Wiring Mode + Housing + Protection + Controller Interface.
Our Capability | What It Solves | Value to Your Business |
Temperature + RH Measurement | Separate sensors increase installation complexity | One integrated transmitter |
2-Wire Current Output | Industrial loop signal required | 4-20mA system compatibility |
3-Wire Current Output | Separate supply and output required | Flexible controller integration |
3-Wire Voltage Output | Controller accepts voltage input | 0-5V / 0-10V / 0-1V options |
Multiple Temperature Ranges | One range cannot cover all projects | Better application matching |
IP65 Housing | Installation environment requires protection | Improved durability |
Membrane Filter | Sensor element needs environmental protection | More reliable sensing |
Optional LCD | Local reading is required | Easier commissioning and inspection |
Typical Applications
Application | Typical Customer | Recommended Solution | Why This Configuration |
HVAC Systems | HVAC equipment and building-control manufacturers | 4-20mA temperature & humidity transmitter | Standard analog output supports HVAC control systems |
Building Automation | BMS and smart-building integrators | 3-wire temperature humidity transmitter | Multiple output options support controller integration |
Environmental Monitoring | Monitoring equipment manufacturers | Temperature & RH transmitter with LCD | Local display and analog output support monitoring |
Warehouses & Storage | Warehouse and storage-system operators | IP65 temperature humidity transmitter | Suitable for environmental condition monitoring |
Industrial Rooms | Industrial equipment and facility operators | 4-20mA RH/T transmitter | Provides centralized environmental feedback |
Greenhouses | Greenhouse and agricultural-control manufacturers | Temperature humidity transmitter | Combined measurement supports climate control |
Technical Specifications & Selection Guide
Parameter | Temperature | Relative Humidity |
Measurement Range | 0...+50°C / 0...+60°C / -20...+80°C | 0...100% RH |
Accuracy at 25°C | ±0.3°C | ±3% RH (20...80% RH) |
Stability | <0.1°C / year | <0.5% RH / year |
Response | <15s | <12s (63%) |
Sensor Protection | Membrane filter | Membrane filter |
Product Structure & Selection Guide
Temperature Range — Choose 0-50°C, 0-60°C or -20-80°C according to the application.
Humidity Range — The supplied specification covers 0-100% RH.
Output Signal — Choose 4-20mA or voltage output according to the controller input.
Wiring Mode — Confirm whether the system requires 2-wire or 3-wire connection.
Power Supply — Confirm according to the selected wiring and output configuration.
Display — Select LCD if local indication is required.
Installation Environment — Confirm humidity, dust and actual installation conditions.
Controller Interface — Confirm PLC, BMS or controller input type before ordering.
3 Common Mistakes When Selecting a Temperature & Humidity Transmitter
1. Choosing the Output Before Checking the Controller
A 4-20mA transmitter cannot directly replace a voltage-output transmitter if the controller input is different. Better: confirm the controller input and transmitter output together.
2. Ignoring the Temperature Range
Different configurations support different temperature ranges. Better: select the transmitter range according to the actual minimum and maximum environmental temperature.
3. Looking Only at Temperature Accuracy
This is a combined temperature and humidity transmitter. Better: evaluate Temperature Accuracy + RH Accuracy + Output + Response + Installation Environment as one complete solution.
One Transmitter for Temperature, Humidity and Standard Analog Output
Environmental monitoring systems often need more than just a sensing element. The complete transmitter must match Temperature Range + Humidity Range + Output Signal + Wiring Mode + Housing + Protection + Controller Interface.
Our Capability | What It Solves | Value to Your Business |
Temperature + RH Measurement | Separate sensors increase installation complexity | One integrated transmitter |
2-Wire Current Output | Industrial loop signal required | 4-20mA system compatibility |
3-Wire Current Output | Separate supply and output required | Flexible controller integration |
3-Wire Voltage Output | Controller accepts voltage input | 0-5V / 0-10V / 0-1V options |
Multiple Temperature Ranges | One range cannot cover all projects | Better application matching |
IP65 Housing | Installation environment requires protection | Improved durability |
Membrane Filter | Sensor element needs environmental protection | More reliable sensing |
Optional LCD | Local reading is required | Easier commissioning and inspection |
Application | Typical Customer | Recommended Solution | Why This Configuration |
HVAC Systems | HVAC equipment and building-control manufacturers | 4-20mA temperature & humidity transmitter | Standard analog output supports HVAC control systems |
Building Automation | BMS and smart-building integrators | 3-wire temperature humidity transmitter | Multiple output options support controller integration |
Environmental Monitoring | Monitoring equipment manufacturers | Temperature & RH transmitter with LCD | Local display and analog output support monitoring |
Warehouses & Storage | Warehouse and storage-system operators | IP65 temperature humidity transmitter | Suitable for environmental condition monitoring |
Industrial Rooms | Industrial equipment and facility operators | 4-20mA RH/T transmitter | Provides centralized environmental feedback |
Greenhouses | Greenhouse and agricultural-control manufacturers | Temperature humidity transmitter | Combined measurement supports climate control |
Technical Data
Parameter | Temperature | Relative Humidity |
Measurement Range | 0...+50°C / 0...+60°C / -20...+80°C | 0...100% RH |
Accuracy at 25°C | ±0.3°C | ±3% RH (20...80% RH) |
Stability | <0.1°C / year | <0.5% RH / year |
Response | <15s | <12s (63%) |
Sensor Protection | Membrane filter | Membrane filter |
Sensor Construction & Selection Guide
Temperature Range — Choose 0-50°C, 0-60°C or -20-80°C according to the application.
Humidity Range — The supplied specification covers 0-100% RH.
Output Signal — Choose 4-20mA or voltage output according to the controller input.
Wiring Mode — Confirm whether the system requires 2-wire or 3-wire connection.
Power Supply — Confirm according to the selected wiring and output configuration.
Display — Select LCD if local indication is required.
Installation Environment — Confirm humidity, dust and actual installation conditions.
Controller Interface — Confirm PLC, BMS or controller input type before ordering.
3 Common Mistakes When Selecting a Temperature & Humidity Transmitter
1. Choosing the Output Before Checking the Controller
A 4-20mA transmitter cannot directly replace a voltage-output transmitter if the controller input is different. Better: confirm the controller input and transmitter output together.
2. Ignoring the Temperature Range
Different configurations support different temperature ranges. Better: select the transmitter range according to the actual minimum and maximum environmental temperature.
3. Looking Only at Temperature Accuracy
This is a combined temperature and humidity transmitter. Better: evaluate Temperature Accuracy + RH Accuracy + Output + Response + Installation Environment as one complete solution.
RTD Performance Depends on Both the Sensing Element and the Complete Probe
A reliable RTD temperature probe requires: Stable RTD Element + Correct Probe Structure + Electrical Insulation + Cable Connection + Mechanical Consistency.
Incoming Material Inspection
Sensing Components — Checked according to confirmed temperature and RH specifications.
Housing — Polycarbonate enclosure inspected before assembly.
Sensor Protection — Membrane filter checked before production.
Electrical Components — Output-related components verified according to selected configuration.
Display — LCD components checked for display versions.
Process Control
Sensor Assembly — Sensing position and probe assembly controlled.
Wiring — Terminal and internal wiring verified.
Output Configuration — Current or voltage mode checked according to order.
Housing Sealing — Enclosure assembly inspected.
Final Configuration — Range, output and display checked before final inspection.
Finished Product Inspection
Test Item | Verification |
Temperature Measurement | According to confirmed range and specification |
Relative Humidity Measurement | According to RH specification |
Analog Output | 4-20mA / voltage output verification |
Wiring Mode | 2-wire / 3-wire functional check |
Response | Functional check |
Display | LCD function check when selected |
Housing / Protection | Assembly and sealing inspection |
Appearance | Finished product inspection |
If You Are an Equipment Manufacturer / OEM
Common Problem | What It Means for Your Business |
Controller input does not match the transmitter output | Additional signal conversion may be required |
Separate temperature and humidity sensors increase installation work | More devices, wiring and installation points are needed |
Standard temperature range does not fit the project | Measurement performance may not match actual environmental conditions |
No local display is available | Commissioning and maintenance become less convenient |
Housing protection is insufficient | Humidity and dust can affect long-term operation |
Wiring mode does not match the control system | Installation and commissioning time increases |
If You Are a Distributor / Importer
Common Problem | What It Means for Your Business |
Customers require different analog outputs | One fixed-output product cannot cover all projects |
Different projects use different temperature ranges | More configuration flexibility is required |
Some customers require LCD and others do not | A single fixed version limits project coverage |
BMS and PLC interfaces differ between customers | Technical matching is required before quotation |
Customers need a complete transmitter rather than a sensing element | Housing, output and wiring become part of the purchasing decision |
Sample Support
Standard Samples — Available according to current configuration and stock.
Output Selection — 4-20mA / 0-10V / 0-5V / 0-1V.
Temperature Range Selection — According to application requirements.
LCD Option — Available according to configuration.
Application Support — Support for HVAC, BMS and environmental monitoring selection.
Sample Validation Before Mass Production
We recommend checking: Temperature → Humidity → Output Signal → Wiring Mode → Controller Input → Installation. Testing the transmitter with the actual PLC, BMS or controller is recommended before project mass production.
Quality Assurance
Temperature Performance — According to confirmed specification.
Humidity Performance — According to confirmed RH specification.
Output Signal — Verified according to selected configuration.
Housing — Polycarbonate enclosure according to product design.
Protection Grade — IP65 according to supplied product information.
Configured Product — Configuration confirmed before production.
Finished Product — Functional inspection before shipment.
MOQ & Lead Time
Standard Product MOQ — Contact us for current MOQ.
Configured Product MOQ — Depends on output, temperature range and display requirements.
Standard Lead Time — Contact us for current production schedule.
Configured Lead Time — Depends on selected transmitter configuration.
Sample Lead Time — Confirmed after specification review.
Cooperation Process — Application Review → Temperature / RH Requirements → Output Confirmation → Wiring Mode → Display Option → Sample Testing → Pilot Order → Mass Production
Q1. What does this transmitter measure?
It measures both temperature and relative humidity.
Q2. What is the humidity range?
According to the supplied specification: 0-100% RH.
Q3. What is the temperature accuracy?
The supplied specification states ±0.3°C at 25°C.
Q4. What is the humidity accuracy?
±3% RH from 20% to 80% RH according to the supplied product information.
Q5. What output signals are available?
Available configurations include 4-20mA / 0-10V / 0-5V / 0-1V.
Q6. Is 2-wire 4-20mA available?
Yes. The ordering information includes a 2-wire current mode 4-20mA option.
Q7. Is 3-wire output available?
Yes. Both current and voltage output configurations are shown for 3-wire operation.
Q8. What temperature ranges are available?
0-50°C / 0-60°C / -20-80°C.
Q9. Is an LCD available?
Yes. An optional LCD configuration is shown in the ordering information.
Q10. What is the housing material?
Polycarbonate.
Q11. What is the protection grade?
IP65.
Q12. What information is needed for a quotation?
Please provide Application + Temperature Range + Humidity Requirement + Output Signal + Wiring Mode + Display Requirement + Quantity.
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