The Thermochrons are designed to maximize energy efficiency. This focus has enabled Thermochrons to provide an impressive battery life performance. For example, a DS1921G logging temperature data every 10 minutes in the operating temperature range between -40°C to 40°C (-40°F to 104°F) will surpass 7 years in battery life. The battery performance is dependent on a number of factors including:
- Logging rate – faster logging rates consume more power.
- Logger type – DS1921 models typically perform better from a battery life perspective.
- Temperature range of operation – batteries perform best at room temperature moving to either extreme reduces performance. The biggest reduction being at the higher operating ranges.
- Selected resolution (DS1922 & DS1923 only) – low resolution is more favorable to battery performance.
The logging frequency supported by the Thermochrons varies by logger model. The DS1921 models can log temperature data every 1 to 255 minutes. The DS1922 & DS1923-F5# can record data every 1 sec to 273 hours.
The Thermochrons are designed to monitor a number of different temperature ranges. Thermochrons operating ranges can be grouped into three types:
- High Temperature – Thermochrons are capable of monitoring temperatures greater than 85°C. They are typically used for monitoring food production, autoclaves and similar applications. The two high temperature ranges available are below:
- General purpose – These units cover a wide range of monitoring needs from freezers up temperature well above those observed in Death Valley. These are commonly used in cold chain applications and a host of bioscience studies.
- Specialized units – These units have a smaller temperature range but offer a better resolution than the DS1921G while at a similar price point.
Older software CDs for 1-Wire Viewer and Thermodata Viewer did not always include a 64 bit installation. You can download a newer 64 bit version of the software packages at:
Support for the iButton Viewer software was discontinued a number of years ago. Existing installations of iButton Viewer are limited to the DS1921 Thermochron models. Not to worry though, OneWireViewer supports all Thermochron models and is available free of charge. It can be downloaded at:
Can the Thermochrons be submerged in water?
The Thermochron’s steel enclosures are designed to withstand harsh environments, making these extremely reliable in a wide range of applications. While the Thermochons are considered to be “water resistant” due to their IP56 (Ingress Protection) rating, they cannot be classified as waterproof, and should not be submerged unless accompanied by a DS9107 waterproof capsule.
An IP rating refers to the Ingress Protection on any piece of equipment against external objects such as; water, steam, liquid, dust, etc. The format for IP ratings shows “IP” (Ingress Protection) followed by two digits. The first digit indicates the protection against solids, and the second indicates the protection against liquids. See chart below for specifications on protection levels and limitations derived from IEC standard 60529.
|Protected against solid foreign objects of 50 mm and greater
|Protected against vertically falling water drops
|Protected against solid foreign objects of 12.5 mm and greater
|Protected against vertically falling drops of water when enclosure tilted up to 15°
|Protected against solid foreign objects of 2.5 mm and greater
|Water sprayed at an angle up to 60° on either side of the vertical shall have no harmful effects
|Protected against solid foreign objects of 1.0 mm and greater
|Protected against splashing from any directions
|Dust protected where limited ingress will not interfere with operation
|Protected against water jets from all any direction
|Protected against powerful water jets
|Protected against the effects of temporary immersion
|Protected against the effects of continued immersion under the manufactured specified conditions
The DS1923 cannot be used to measure soil moisture. When a DS1923 is buried the %RH will read 100+%. Also, it would likely be damaged due to water ingress over time.
The DS9107 waterproof capsule is designed as a protective enclosure that prevents the ingress of water and moisture. The DS1923 is a temperature and humidity logger, and while it can record temperature inside a DS9107 waterproof capsule, it cannot record accurate humidity readings for the ambient air (outside of the DS9107+).
There are several software and hardware options for the missioning and downloading aspects of the Thermochrons. The most common solution is exhibited by the SK-IB-R – iButton Connectivity Kit, which includes all the necessary components to connect the Thermochrons to your Windows computer via USB, mission the Thermochrons, and download the temperature and/or humidity data. To learn about all the missioning and downloading options, please look at the Starter Kits section of our website.