What is a "Digital Hygrometer" or "Recording Hygrometer"?

The word "hygrometer" or "digital hygrometer" is a generic term referring to any instrument that measures the humidity of air. Sometimes also called a psychrometer. Hygrometers can have many levels of quality, functionality and accuracy, ranging from a child's science experiment to a $20,000 primary standards lab humidity chamber.

Types of hygrometers include psychrometers, sling psychrometers, and hygrothermographs. Other common terms that have a similar meaning include humidity indicator, humidity gauge, humidity meter, humidity recorder, and humidity sensor.

A "recording hygrometer" is an instrument that not only measures humidity, but also records data in a permanent record. They can be mechanical devices, such as chart recorders and hygrothermographs, or electronic and digital hygrometer versions, such as data loggers.

Hygrometers & The Challenge of Humidity Measurement

Humidity is one of the most difficult parameters to measure. It is, however, what we do best at Veriteq. According to the WMO Guide, "The achievable accuracies for humidity listed in the table refer to good quality instruments that are well operated and maintained. In practice, these are not easy to achieve." Too true.

The effect of moisture in the air on products and processes cannot be exaggerated so it's critical to measure relative humidity continuously in many environments. Easier said than done because rate of measurement accuracy in humidity is much lower than measuring other parameters, such as time or temperature.

However, the issue with measuring humidity is not so much in obtaining accuracy, in so much as maintaining accuracy over time. This is because all humidity sensors must be exposed to the air, along with all its contaminents. Even in an environment cleaned of particulates and micro-organisms, the sensor's accuracy is constantly degrading.

How to Measure RH Accurately: Calibrate, Calibrate, Calibrate

At Veriteq, we start with industry-best sensors in a ruggedly constructed data logger that is equipped with on-board memory and a 10-year lithium battery. We calibrate the loggers to more reference points than any other device and all sources of inaccuracy are accounted for.

Our product specification sheets show accuracy not only upon implementation — but one full year after field use. The result is a humidity sensor that is more stable between calibrations and a data logger that records accurately for longer.

When you measure humidity with a Veriteq data logger, you can be certain the RH percentage is a true value that will stay true longer than any other hygrometer. The data will never be lost, thanks to the autonomous recording in each logger and you'll never have to worry about power outages.

Read more on Humidity Calibration for Hygrometers...

From Digital Hygrometers to Data Loggers

The SP-2000 Temperature & Humidity data logger is a completely self-contained digital recording hygrometer that measures and logs readings to its internal memory. A high precision instrument, the SP-2000 leads the industry with an accuracy of +/- 1% relative humidity.

In addition, the 10-year battery life and compact size makes the device more dependable and easier to use than any other type of recording hygrometers such as chart recorders and hygrothermographs.

Read more about the SP-2000. If you have any questions, please email us or complete the form on this page, and a Veriteq representative will contact you.

To learn more about Veriteq's unique solution for humidity measurement, read our technical paper:"The AC Bridge Approach: Greater Accuracy in Measuring Capacitive RH Sensors" found on the "Hygrometers" page of Wikipedia. The article was presented at the Worldwide Symposium on Humidity in 2006.

To learn more about our solutions for humidity measurement, monitoring, alarming and validation for critical applications, contact Veriteq.

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