Hygrocron - Hygrochron
Temperature & Humidity Logger - very small

Hygrocron Temperature & Humidity Logger - button size

Either 4,000 time/temperature/humidity recordings at low resolution or 2,000 readings at high resolution.

Dimensions:   Diameter: 16.25mm dia, rim: 17.35mm dia,
                         Height: 5.89mm incl rim.

Adds an embedded humidity sensor to the temperature-logging capability of the high-capacity Thermocron/Hygrocron family to create a data logger that records both temperature and humidity.

So, relative humidity can be logged as a function of time.
The tiny opening in the lid of the Hygrochron employs a special filter that allows water vapor to pass through and reach the internal humidity sensor, but repels liquid-phase water.

For applications where both temperature and humidity are important (foods, chemicals, powders, HVAC systems), the Hygrochrons deliver unprecedented performance in an unbelievably compact size.

Attach to almost anything
The 16mm iButtons (about the size of 5 stacked coins) attach unobtrusively to almost any container surface or wall-on bottles, totes, boxes, crates, pallets, air cargo containers, refrigerators, semi trailers, railroad freight cars, etc.
The stainless steel armor withstands dirt, moisture and rough treatment.

Versatile Data Storage: Log and Histogram Formats
Thermocron and Hygrocron can wake up to take time-stamped temperature and/or humidity readings at equal time intervals, then store them in a log format in on-board "datalog" memory.
The standard Thermochrons (temp. only) allow 2048 readings with time intervals of 1 to 255 minutes, while the high-capacity Thermochrons/Hygrochrons allow 8192 readings with time intervals from 1 second to 273 hours. Additionally, the Hygrochron allows for simultaneous temperature and humidity logging and offers selectable resolution settings.

The way in which the devices log data can be setup by the user prior to use. This is called "missioning".
Typically, during missioning the user chooses the time to begin temperature/humidity readings,
sets a sampling rate, sets high and low alarm thresholds,
and determines whether to rollover when the readings fill up the datalog memory or to simply stop logging.
This method of data storage records when a critical thermal/humidity exposure occurs and helps to assign accountability for any resulting loss of product quality.

Standard Thermochrons, the DS1921G, H, and Z also simultaneously store each temperature sample in a histogram.
The histogram memory consists of 63 bins in 2-degree increments for the DS1921G or 64 bins in 0.5-degree increments for the DS1921H or Z. Each bin holds 65,500 temperature readings for up to 10 years. The histogram method of data storage is perfect for applications with a need for long-term monitoring but with less-strict accuracy requirements. The higher capacity Thermochron and Hygrochron lines do not have the histogram function, but they have nearly 4 times the data logging memory.

Thermochron Family of Products
Our standard Thermochron, the DS1921G, logs temperatures over a wide temperature range of -40°C to 85°C. The H and Z Thermochrons are our high-resolution versions. The DS1921H is designed for the human temperature range while the DS1921Z is designed for applications that need high resolution around 0°C.

The high capacity Thermochrons are the DS1922L, DS1922T, and the DS2422. The DS1922L is the standard high capacity Thermochron iButton that logs temperatures over the range of -40°C to 85°C. It has an 8192 byte temperature log with accuracy correctible (by software) to ±0.5°C from -10°C to +65°C. It has selectable 8-bit (0.5°C) or 11-bit (0.0625°C) resolution. The temperature log values are also selectable (between 8-bit or 16-bit ). The DS1922T Thermochron iButton is similar to the DS1922L only with a higher temperature logging range (that can be used in manufacturing processes involving sterilization techniques). The main differences between the two is that its temperature range is 0°C to 125°C, and it's accuracy is software-correctible to ±0.5°C from 20°C to +75°C.

Finally, the DS2422 operates the same way (through a 1-Wire interface), and with the same functionality as the DS1922L. However, it is a packaged ic (24-lead, 300-mil SO) that when connected to an optional analog-to-digital converter (ADC) and a charge pump, application-specific dataloggers can be built (i.e., humidity, pressure, light sensor, material stress, etc).

Specifications:
Temperature Range: -20°C to 85°C ±0.5°C* (SC)
  *Temperature accuracy denoted here is effective over most of the temperature range of the part.
     For full-range accuracy, please refer to the part's datasheet DS1923 (.pdf)
Temperature Resolution: 0.5°C or 0.0625°C

Humidity Range:       0 to 100% RH
Humidity Resolution:     8-Bit (0.6%RH) or 12-Bit (0.04%RH) RH

Data Log Memory:     8192 bytes

Dimensions:      Diameter: 16.25mm dia, rim: 17.35mm dia,    Height: 5.89mm incl rim.

Life span of the Thermochron: Either 10 years or 1 million temperature measurements (at 50°C or less), whichever comes first.

Common Thermocron & Hygrocron features:
Digital identification and information by momentary contact
Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures ab-solute traceability because no two parts are alike
Multidrop controller for 1-Wire net
Chip-based data carrier compactly stores information
Data can be accessed while affixed to object
Button shape is self-aligning with cup-shaped probes
Durable stainless-steel case engraved with registration number withstands harsh environments
Easily affixed with self-stick adhesive backing, latched by its flange, or locked with a ring pressed onto its rim
Presence detector acknowledges when reader first applies voltage
Meets UL#913 (4th Edit.).
Intrinsically Safe Apparatus: approved under Entity Concept for use in Class I, Division 1, Group A, B, C and D Locations (application pending)

HC1  Hygrocron -30° to 85° Temperature + Humidity Logger, 4000 readings:  $199+GST   (for 10+: $189+GST each)

See further down the page for more information about the Thermocron.

Also required: Reader & Software, see below.

Fobs:
Fobs are small plastic tags used to identify the Thermocron & Hygrocron, and make them easier to handle.

Recommended fob colours:
     For TC1: black,   for TCZ1: blue,    for TCS1: green,    TCX1: yellow

FOB2-BK  Black plastic fob $3

FOB2-BLK Black fob $3
FOB2-GRN Green fob $3
FOB2-BLUE Blue fob $3
FOB2-YEL Yellow fob $3
FOB2-RED Red fob $3

CLRFOB  Clear fob with numbered insert $4
CLRFOB-CUST Clear fob with customised insert.
                              Artwork fee applies. Contact Esis for further details. $4

Software/readers

The Thermocron requires a complete kit including software and reader to run.
TC-Spy hand held unit (see below) only requires the software to retrieve results,
but a reader is still required if the Thermocrons have not been previously programmed.

LKIT   eTemperature Kit:  eTemperature software, reader with USB i/f, and case:   $155+GST

LLIC  eTemperature License  $110+GST

Software can be loaded on unlimited machines.

eTemperature supports the following devices:
        Thermocrons: TC, TCZ, TCH, TCS, TCX,   TC-Spy, Texmate

It provides the ability to:
   Setup units
   Download results
   Graph results with pan and zoom capabilities
   Save results for later recall
   Export results to other programs
   Email results
   Quickly program units with preset options

LKITINST  eTemperature Kit and Installation:   $350+GST

Supply and install of eTemperature kit within the Sydney metropolitan area.

If the installation time is less than one hour then the remaining time can be used for training.
Additional training is available on request.

TC-Spy Hand Held Unit

TC-Spy  is a hand held unit with a two line display used to test, start and read Thermocrons in the field: $250+GST

Display the stored description of the Thermocron
• display the last temperature reading
• display the list of alarm date, time and durations
• stop a running Thermocron
• restart a stopped Thermocron using its last settings

TCSPY2 is a TC-Spy with 2M download memory:  $300+GST

TC-Spy2 has the ability to download the complete contents of the Thermocron into its memory. Up to 600 mission results can be stored in memory. Missions are then downloaded to a computer for viewing with eTemperature.

This makes it ideal for applications where the Thermocron must remain in place and can not be easily connected to a computer.

TC-Spy also has the ability to:

• display the stored description of the Thermocron
• display the last temperature reading
• display the list of alarm date, time and durations
• stop a running Thermocron
• restart a stopped Thermocron using its last settings

TCSPY4  is a TC-Spy with 4M download memory   $400+GST

TC-Spy4 has the ability to download the complete contents of the Thermocron into its 4M memory. Up to 1,200 mission results can be stored in memory. Missions are then downloaded to a computer for viewing with eTemperature.

This makes it ideal for applications where the Thermocron must remain in place and can not be easily connected to a computer.

TC-Spy also has the ability to:

• display the stored description of the Thermocron
• display the last temperature reading
• display the list of alarm date, time and durations
• stop a running Thermocron
• restart a stopped Thermocron using its last settings

More on the Hygrocron ...

    FAQ on Thermocron Loggers

Missioning the Thermochron
Missioning the Thermochron or Hygrochron iButton is done with a PC or handheld. The iButton connects to a Blue Dot receptor (a low cost reader interface) which in turn is connected to a 1-Wire Adapter attached to a computer. This site provides free evaluation software to set start time, sampling rate, and alarm thresholds.

The low cost reader interface includes:

     DS1402D-DR8 - Blue Dot Receptor
     DS9097U-S09 - 1-Wire to RS-232 Adapter
     or
     DS9490R - 1-Wire to USB Adapter

How to Download Free Evaluation Software
Two different evaluation software programs are available to be downloaded. They can be downloaded here.
Both programs depend upon the 1-Wire Drivers installation package.
Version 3.21 of the 1-Wire Drivers (also known as the TMEX Runtime Environment—RTE) includes the iButton Viewer.
It supports the DS1921G, H, and Z. Version 4.00 of the 1-Wire drivers includes a link to download and install the OneWireViewer.
It is a Java program that contains support for both Thermochrons and Hygrochrons.
The software, of course, depends upon the correct hardware being installed on a PC.
To do this, plug the 1-Wire adapter into the PC, connect the Blue Dot Receptor to the adapter, and plug in a Thermochron or Hygrochron in the Blue Dot.
Then, run one of the above-mentioned programs to locate and click on the iButton's serial number.
This starts the program/mission wizard. It is a guide that provides the steps to set up a temperature/humidity logging mission.
Briefly, the steps include:

Set the clock.
Set the time alarm.
Set the sample rate.
Set the temperature/humidity alarm.
Set the mission start delay.
Check when mission will end; select data rollover or not.
Finish.
Programmers: The following kits contain example applications to mission and download Thermocrons/Hygrocrons.

1-Wire SDK for Windows (Visual Basic) - contains Thermochron support. The 1-Wire Drivers package contains .NET support for Hygrochrons.
1-Wire API for Java (Java) - contains OneWireViewer source code.
1-Wire Public Domain Kit (C) - contains "humalog" program with source code for Hygrochrons and high-capacity Thermochrons. It also comes with the "thermodl" program with source code supporting standard Thermochrons.
Starter Kit Available
If you want to get up and running quickly, the DS1921K Thermochron iButton Starter Kit contains all of the hardware necessary to configure a Thermochron iButton and review the resulting data. The data can also be saved or imported into other applications.

The DS1921K Starter Kit includes:

DS1921L-F51 Thermochron iButton
DS9093F iButton Keyring Fob Attachment
DS9490R 1-Wire to USB Adapter
DS1402D-DR8 Blue Dot Receptor with RJ-11 Connector
Instruction Sheet

Thermochron/Hygrochron Solutions
We have several partners that have developed hardware and software solutions around our Thermochron products.
Software products that run on both the PC and PDA give you the ability to mission, upload, and manage the data from thousands of Thermochrons.
Hardware products range from small devices to mission Thermochrons and read their alarm status to data collection devices for HACCP applications. .