Precision test for the Sensirion SHT35 humidity sensor

condensed window
Weather monitoring: measuring wind at a festival site
Choose the right flow meter for your next water project
How to measure Dew Point and Wet Bulb temperature
Precision test for the Sensirion SHT35 humidity sensor
Installing a weather station on caravans, holiday homes or recreational vehicles
The effect of wind on measuring particulate matter
Connecting a Watermark sensor to the cloud
Watermark vs SMT100: volumetric water content or soil water tension?
Smart geotechnical data gathering and interpretation
6 tips for making the most of your cold room
Temperature registration for HACCP
Quickly tackle the 7 principles of HACCP
6 lists to quickly get started with HACCP
Monitoring soil moisture contents for crop farming
Green Wall Monitoring: Why your vertical garden needs smart garden sensors
How is Reporter powered?
Storm & scaffolding: leveraging weather stations for enhanced construction site safety
Level measurement in a container or well
The ease of Reporter: Sumaq's a fan!
Protecting fruit tree blossoms from freezing
Adverse weather warning for your construction site
Real-time Frost Monitoring & Alert System
Pseudomonas syringae prevention in fruit trees
Cold storage of cut flowers with temperature monitoring
IoT sensor module with GPS tracker
What is the ideal temperature for a cold room?
Uses of the Crodeon API
A Weather Station with API
4 Things to look for in a temperature sensor with API
A weather station with water level sensor for a marina or harbour
How VITO makes Flanders waterproof
Why we manufacture in Belgium
Haringvliet bridge renovation: a weather station for construction sites
What is the ideal server room temperature?
Easy environmental monitoring for a server room
Steen Vastgoed and Reporter, a rock-steady duo!
FKT and Reporter: match made in cold room
A weather station with multiple sensors
A power failure detector for your construction site
Combined pressure and temperature measurement
Using a weather station on your construction site
Roof climate research
Sustainable irrigation with a water usage monitoring device
Green roof monitoring
Industrial odour monitoring with a weather station
How groundwater level affects cracks and tears in buildings
4G and solar-powered IoT device: Revolutionizing remote monitoring with Reporter
Housing requirements for a poultry farm: the complete guide
Monitoring heat treatment in cargo containers
How to prevent and detect a barn fire in a pig pen

We recently tested and documented the precision of the SHT35 T/RH sensor from Sensirion. In this article we explain the results of our tests.

The SHT35 is the high-end version of the SHT3x series that Sensirion calls the new industry standard in humidity sensing. In our case we’re talking about the SHT35-DIS-F version of the SHT35, which includes an on-chip PTFE foil membrane that allows for sensor use under harsh environmental conditions.

What does the datasheet say?

The datasheet of the SHT35 lists the accuracy of all versions of the sensor. Please note that the accuracy is not the same thing as the precision of a sensor. More about this later.

The SHT35-DIS-F offers the highest accuracy of all: 1,5% humidity @0-80% RH) and 0,1°C temperature (@20-60 °C), which is quite impressive. Let’s see if this is the case if we compare multiple of these sensors in real life.

sensirion sht35 specs

Results of our tests

We tested the precision of 6 of these sensors over a period of 12 hours. The goal was to compare the values with the average of all measurements and see if the deviation was within the accuracy limits.

A few words about the form factor of the sensors. We used these RH sensors from Crodeon, which are enclosed in a radiation shield suited for outdoor use. All sensors were connected to our Reporter, a wireless gateway with gsm connection to the cloud.

€499

After 12 hours we downloaded the data from the Crodeon Dashboard to Excel. This is where the interesting part started. The following graph shows the temperature readings of our 6 sensors on an interval of 5 minutes. Reporter can handle more intense intervals up to 30 seconds but for this test we thought 5 minutes was sufficient.

sht35 temperature precision

As you can see in the data, almost all of the readings fall within the accuracy limits of -0,1°C and + 0,1°C as claimed in the datasheet.

Now it’s time to investigate the humidity readings. The SHT35 is one of the most accurate humidity sensors on the market. It’s really hard to find this kind of sensors with an accuracy of +/-1,5%RH or better. The following graph did not disappoint us.

sht35 humidity precision

Precision versus accuracy

The attentive readers will surely point out that we haven’t really investigated the accuracy of our sensor. That’s right. As explained by Wikipedia, in a set of measurements, accuracy is closeness of the measurements to a specific value, while precision is the closeness of the measurements to each other.

A next quality control would be to test these humidity sensors in a calibrated environment to see how they compare to real world values, which must be measured by a primary of secondary calibrated standard. This is something we will blog about in the near future.

Conclusion

As you can see, we were very satisfied with the performance of the SHT35 digital TRH sensor. The precision is outstanding and we have high hopes for the accuracy as well. We will continue to use this sensor in our research projects for Smart Agriculture, Smart Construction, industry, Smart Indoor Climate, and Smart Food.

Measuring relative humidity can be especially useful when it comes to cut flower preservation, farming mealworms, cold storage of onions or potatoes, monitoring paper archives, monitoring dew point and wet bulb temperatures, or in construction projects to monitor dew point for glue applicationRH in curing concrete, or preventing concrete decay in existing structures.

Back to blog

Any questions?

Call us at +32474097705 Or use the contact form

1 of 4
  • Demo laptop

    Live online demo

    Sign up for a free account on the Crodeon Dashboard a watch a real live working demo.

    Watch the demo 
  • person

    Talk to sales

    Schedule an appointment with Jonathan, our Sales Manager, for more information about this solution.

    Schedule a call 
  • phone email

    Contact us

    For partnerships, distribution, or any other question, don't hesistate to contact us!

    Contact us