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Thermochron Temperature Loggers

Thermochron coin-sized loggers

Thermocron, Hygrocron

Thermochrons measure temperature (and sometimes humidity) and record the readings in memory.

You place the Thermochron where you want to measure temperatures – a refrigerator, a greenhouse, a shipping container, a bain marie, etc. The Thermochron will record temperatures to its internal memory. You can download the readings to see a record of conditions experienced by the logger.

Thermochrons are tiny – about the size of two $2 coins. They are made from stainless steel and they are very resistant to weather. Their small size and toughness makes them ideal for a wide range of temperature logging situations.

Thermochrons have a built-in battery that can last up to ten years.

Thermochron – button size data loggers

Very low cost temperature (Thermochron), or temperature, & humidity (Hygrochron) loggers

Thermochrons are incredibly small, robust temperature loggers.

Features include:

  • Long battery life (up to 10 years depending on usage pattern)
  • Stainless steel housing making them incredibly tough
  • Support temperatures from -40° to 140° (model specific)

Their small size and sturdy construction make them ideal for wet and rough conditions.
Their low price make them ideal for tracking everything from individual fridges to individual shipments.

Attach to almost anything
The 17mm 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.

For adverse environments, they can be housed in the iButton Capsule (see below).

The basic Thermocron (TC) measures temperature in 0.5°C increments, while the super models (TCS, TCX, TCU, HC) support increments of 0.063°C.

Accuracy (TC model): ±1°C from -30°C to +70°C, ±1.3C beyond this range
Resolution (TC model): 0.5°C

  • Built-in real-time clock (RTC) and timer has accuracy of ±2 minutes per month from 0°C to 45°C
  • Automatically wakes up and measures temperature at user-programmable intervals from 1 to 255 minutes
  • Delay Start Up to 45 days

Thermochron Specifications

Note that the temperature ranges shown are as specified by the manufacturer, however if you need to measure temperatures below -30 degrees C we would recommend a different logger, please contact us for details.

There are several iButtons from which to choose.
The TC, TCH, and TCZ are standard Thermochrons.
The TCS, TCX, and TCU are high-capacity Thermochrons with more logging memory, increased accuracy, and increased resolution.

The standard Thermochron (TC, TCH, TCZ) allows 2048 readings with time intervals of 1 to 255 minutes.
The high-capacity Thermochrons/Hygrochrons allow 8192 readings with time intervals from 1 second to 273 hours.

  • Logs thousands of consecutive temperature measurements in protected nonvolatile (NV) random access memory
  • Records a long-term Temperature Histogram with 2.0°C resolution (63 bins)
  • Programmable temperature-high, and temperature-low alarm trip points
  • Records up to 24 time stamps and durations when temperature leaves the range specified by the trip points
  • Data can be accessed while affixed to an object
  • Durable stainless-steel case engraved with registration number withstands harsh environments
  • Easily affixed with self-stick adhesive backing, latched by its flange, or locked into a Fob (see below)

Additionally, the Hygrochron (see below) allows simultaneous temperature and humidity logging and offers selectable resolution settings.

The Thermochron and Hygrochron iButton data loggers are ideal for a diverse range of applications. Because of their stainless steel casing, these devices are especially useful in harsh environments. Care must be taken, however, not to subject the units to environmental forces that exceed their specified level of protection. Thermochron and Hygrochron iButtons are certified to IP56 (dust and strong water jets), but should not be submerged.

For a submerged application a waterproof enclosure such as the iButton Capsule must be used.

Thermochron dimension diagram (opens in a new tab)

To get started, you need:

  • One USB Reader which includes a software licence code (see below), and
  • Thermochron / Hygrochron loggers (choose from generic, super, high temperature, humidity, etc)
  • Optionally: Fobs to assist in the handling of the Thermocrons (see below).

TC Generic logger, to 85°C (DS1921G)


Budget-priced logger suitable for most logging applications. The Thermochron® iButton® device (DS1921G) is a rugged, self-sufficient system that measures temperature and records the result in a protected memory section.

-40° to 85°C, Res 0.5°C, 2000 readings storage: $60+GST (4/14)
Substantial quantity discounts are available for Thermochron loggers – please enquire

Thermochron TC – Basic Logger - 1921G-DE
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Thermochron TC – Basic Logger - 1921G-DE

Budget-priced logger suitable for most logging applications

The Thermochron® iButton® device (DS1921G) is a rugged, self-sufficient system that measures temperature and records the result in a protected memory section. The recording is done at a user-defined rate, both as a direct storage of temperature values as well as in the form of a histogram. Up to 2048 temperature values taken at equidistant intervals ranging from 1 to 255min can be stored.

Key Features

  • Temperature accuracy of ±1°C from -30°C to +70°C
  • Resolution: 0.5°C (8-bit)
  • User-programmable logging intervals from 1 minute to 255 minutes
  • Memory for up to 2048 readings
  • Factory-lasered with a guaranteed unique 64-bit registration number that allows for absolute traceability
  • Individually calibrated in an NIST-traceable chamber (complies to Standard EN12830)
  • Water-resistant enclosure (IP56) or waterproof if placed inside Thermochron Capsule
  • CE, FCC, and UL913 certifications

-40° to 85°C, Res 0.5°C, 2000 readings storage: $60+GST (4/14)
Substantial quantity discounts are available for Thermochron loggers – please enquire.

Thermochron TC1 (DS1921G) Data Sheet (pdf, opens in a new tab)

Also required with Thermochron: eTemperature Kit (PC Software and USB Reader) see below under Accessories

TCZ Fridge logger, -5°C to 25°C (DS1921Z)


The Thermochron® iButton® devices (DS1921H/Z) are rugged, self-sufficient systems that measure temperature and record the result in a protected memory section.

-5°C to 26°C, Res 0.125°C, 2000 readings storage: $45+GST (8/14)
Substantial quantity discounts are available for Thermochron loggers – please enquire.

DS1921Z
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DS1921Z

The Thermochron® iButton® devices (DS1921H/Z) are rugged, self-sufficient systems that measure temperature and record the result in a protected memory section. The recording is done at a user-defined rate, both as a direct storage of temperature values as well as in the form of a histogram. Up to 2048 temperature values taken at equidistant intervals ranging from 1 to 255 minutes can be stored.

Key Features

  • Digital thermometer measures temperature 1/8°C increments with ±1°C accuracy
  • Built-in real-time clock (RTC) and timer has accuracy of ±2 minutes per month from 0°C to 45°C
  • Water resistant or waterproof if placed inside DS9107 iButton capsule (Exceeds Water Resistant 3 ATM requirements)
  • Automatically wakes up and measures temperature at user-programmable intervals from 1 to 255 minutes
  • Logs consecutive temperature measurements in 2KB of datalog memory
  • Records a long-term temperature histogram with 1/2°C resolution
  • Programmable temperature-high and temperature-low alarm trip points
  • Records up to 24 time stamps and durations when temperature leaves the range specified by the trip points
  • 512 bytes of general-purpose battery-backed SRAM
  • Communicates to host with a single digital signal at 15.4kbits or 125kbits per second using 1-Wire protocol
  • Fixed range: H: +15°C to +46°C; Z: -5°C to +26°C

-5°C to 26°C, Res 0.125°C, 2000 readings storage: $45+GST (8/14)
Substantial quantity discounts are available for Thermochron loggers – please enquire.

Thermochron TCZ Fridge logger (DS1921Z) Data Sheet (pdf, opens in a new tab)

Also required with Thermochron: eTemperature Kit (PC Software and USB Reader) see below under Accessories

TCS Super model, to 85°C (DS1922L)


The iButton® temperature loggers (DS1922L/T) are rugged, self-sufficient systems that measure temperature and record the result in a protected memory section.

-40°C to 85°C, 8000/4000 readings, Resolution: 0.5°C/0.0625°C: $90+GST
Substantial quantity discounts are available for Thermochron loggers – please enquire.

Thermochron TCS – Super Logger - 1922L-DE
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Thermochron TCS – Super Logger - 1922L-DE

The iButton® temperature loggers (DS1922L/T) are rugged, self-sufficient systems that measure temperature and record the result in a protected memory section. The recording is done at a user-defined rate. A total of 8192 8-bit readings or 4096 16-bit readings taken at equidistant intervals ranging from 1s to 273hrs can be stored.

Key Features

  • Temperature accuracy of ±0.5°C from -10°C to +65°C (with software correction)
  • Choice of resolution: 8-bit (0.5°C) or 11-bit (0.0625°C)
  • 512 Bytes of memory – enough for ~4,000 11-bit reading or ~8,000 8-bit readings
  • Factory-lasered with a guaranteed unique 64-bit registration number that allows for absolute traceability
  • Individually calibrated in an NIST-traceable chamber (complies to Standard EN12830)
  • Water-resistant enclosure (IP56) or waterproof if placed inside Thermochron Capsule
  • CE, FCC, and UL913 certifications

-40°C to 85°C, 8000/4000 readings, Resolution: 0.5°C/0.0625°C: $90+GST
Substantial quantity discounts are available for Thermochron loggers – please enquire.

Thermochron TCS – Super Logger (DS1922L) Data Sheet (pdf, opens in a new tab)

Also required with Thermochron: eTemperature Kit (PC Software and USB Reader) see below under Accessories

TCX Extreme model, to 125°C (DS1922T)


The iButton® temperature loggers (DS1922L/T) is configured and communicates with a host computing device through the serial 1-Wire® protocol, which requires only a single data lead and a ground return.

-40°C to 85°C, 8000/4000 readings, Resolution: 0.5°C/0.0625°C: $90+GST
Substantial quantity discounts are available for Thermochron loggers – please enquire.

Thermochron TCX – Extreme Logger 1922T-DE
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Thermochron TCX – Extreme Logger 1922T-DE

The iButton® temperature loggers (DS1922L/T) are rugged, self-sufficient systems that measure temperature and record the result in a protected memory section. The DS1922L/T is configured and communicates with a host computing device through the serial 1-Wire® protocol, which requires only a single data lead and a ground return. Every DS1922L/T is factory-lasered with a guaranteed unique 64-bit registration number that allows for absolute traceability. The durable stainless-steel package is highly resistant to environmental hazards such as dirt, moisture, and shock. Accessories permit the DS1922L/T to be mounted on almost any object, including containers, pallets, and bags.

Key Features

  • Temperature accuracy of ±0.5°C from -10°C to +65°C (with software correction)
  • Choice of resolution: 8-bit (0.5°C) or 11-bit (0.0625°C)
  • 512 Bytes of memory – enough for ~4,000 11-bit reading or ~8,000 8-bit readings
  • Factory-lasered with a guaranteed unique 64-bit registration number that allows for absolute traceability
  • Individually calibrated in an NIST-traceable chamber (complies to Standard EN12830)
  • Water-resistant enclosure (IP56) or waterproof if placed inside Thermochron Capsule
  • CE, FCC, and UL913 certifications

-40°C to 85°C, 8000/4000 readings, Resolution: 0.5°C/0.0625°C: $90+GST
Substantial quantity discounts are available for Thermochron loggers – please enquire.

Thermochron TCX – Extreme Logger (DS1922T) Data Sheet (pdf, opens in a new tab)

Also required with Thermochron: eTemperature Kit (PC Software and USB Reader) see below under Accessories

TCU Ultra model, to 140°C (DS1922E)


Extreme monitoring without a probe. Great for monitoring sterilizations, the Thermochron DS1922E can record up to 284°F (140°C).

+15°C to 140°C, 8000/4000 readings, Res 0.5°C/0.0625°C: $199+GST
Substantial quantity discounts are available for Thermochron loggers – please enquire.

Thermochron TCU – Ultra Extreme Logger 1922E-DE
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Thermochron TCU – Ultra Extreme Logger 1922E-DE

Extreme monitoring without a probe. Great for monitoring sterilizations, the Thermochron DS1922E can record up to 284°F (140°C).

This unit is most commonly used to ensure that sterilizers are functioning efficiently, but there are also uses in mining, food preparation, scientific research and industrial processes.

Key Features

  • Temperature accuracy of ±0.5°C from -10°C to +65°C (with software correction)
  • Choice of resolution: 8-bit (0.5°C) or 11-bit (0.0625°C)
  • 512 Bytes of memory – enough for ~4,000 11-bit reading or ~8,000 8-bit readings
  • Factory-lasered with a guaranteed unique 64-bit registration number that allows for absolute traceability
  • Individually calibrated in an NIST-traceable chamber (complies to Standard EN12830)
  • Water-resistant enclosure (IP56) or waterproof if placed inside Thermochron Capsule
  • CE, FCC, and UL913 certifications

+15°C to 140°C, 8000/4000 readings, Res 0.5°C/0.0625°C: $199+GST
Substantial quantity discounts are available for Thermochron loggers – please enquire.

Note: Accuracy between +110°C to +140°C is ±1.5°C. For the remaining range it is ±7°C.

Data sheet on DS1922E (pdf, opens in a new tab)

Also required with Thermochron: eTemperature Kit (PC Software and USB Reader) see below under Accessories

Also available: Fobs (holder for the logger) see below Fobs for Thermocrons

FAQ on Thermocron Loggers

Hygrochron (aka Hygrocron) Humidity and Temperature logger

HC Humidity & Temperature model (DS1923L)


The iButton® temperature/humidity logger (DS1923) is a rugged, self-sufficient system that measures temperature and/or humidity and records the result in a protected memory section.

0 to 100%RH, -20°C to 85°C, Res 0.5°C / 0.0625°C, 4000 / 2000 readings: $165+GST
Substantial quantity discounts are available for Hygrochron loggers – please enquire.

Thermochron TC – Basic Logger - 1921G-DE
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Thermochron TC – Basic Logger - 1921G-DE

The iButton® temperature/humidity logger (DS1923) is a rugged, self-sufficient system that measures temperature and/or humidity and records the result in a protected memory section. A mission to collect data can be programmed to begin immediately, or after a user-defined delay or after a temperature alarm. Access to the memory and control functions can be password-protected.

Key Features

  • Digital Hygrometer measures humidity with 8-Bit (0.6%RH) or 12-Bit (0.04%RH) resolution
  • Temperature accuracy of ±0.5°C from -10°C to +65°C (with software correction)
  • Choice of resolution: 8-bit (0.5°C) or 11-bit (0.0625°C)
  • 512 Bytes of memory – enough for ~4,000 11-bit reading or ~8,000 8-bit readings
  • Factory-lasered with a guaranteed unique 64-bit registration number that allows for absolute traceability
  • Individually calibrated in an NIST-traceable chamber (complies to Standard EN12830)
  • CE, FCC, and UL913 certifications

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.

0 to 100%RH, -20°C to 85°C, Res 0.5°C / 0.0625°C, 4000 / 2000 readings: $165+GST
Substantial quantity discounts are available for Hygrochron loggers – please enquire.

Common features of Thermochrons & Hygrochrons (jumps to higher up this page)

Data sheet on Hygrochron (pdf, opens in a new tab)

Dimensioned diagram of Hygrochron (opens in a new tab)

Also required with Hygrochron: eTemperature Kit (PC Software and USB Reader) see below under Accessories

Also available: Fobs (holder for the logger) see below Fobs for Thermocrons

FAQ on Thermochron Loggers

Accessories

eTemperature Software and USB Reader KitSoftware & Readers

The Thermocron & Hygrochron require the USB Reader, which includes a licence code for the eTemperature software when purchased from ESIS.

USBRDR   USB Reader for Thermochron/Hygrochron, with licence code for downloadable eTemperature software: $155+GST

The software can be loaded on unlimited machines.
Update from web: free.
Optional update CD: UPD-CD eTemperature CD: $25

eTemperature is an Australian owned and developed software package.

For pricing of more than 5 units, please contact us.

eTemperature Software Download (opens in a new tab)

eTemp SoftwareeTemperature Software 

eTemperature is an easy to use software package designed in Australia, for Thermochrons / Hygrochrons. Local technical support means you’ll never be stuck for long.

Supports the following devices:

Thermocrons: TC, TCZ, TCH, TCS, TCX
Hygrochron: HC

It provides the ability to:

  • Set up the data loggers
  • 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

Recent new features include:

  • Automatic emailing of results
  • Online loggers with automatic downloading, saving and emailing
  • Automatic unlock code detection when online
  • PDF results
  • Support for humidity loggers

Version 7.14 New features include:

  • Support for 64-bit windows (see new drivers below)
  • Daily Min/Max report
  • Option for exceptions in min/max report
  • Calculation of IceDays
  • Advanced data analysis capabilities

NOTE: You must install either the 32-bit or 64-bit drivers as well as eTemperature.

Licences
Licences give unlock codes and the installation guide.
Unlock codes are reader specific.

Customer must return a broken Reader before a replacement will be provided. An unlock code will then be provided.

Fobs for Thermocrons

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

Standard Fobs for Thermocrons

Fobs

These sturdy plastic fobs can be used to identify your Thermochrons and make them easier to handle. They can be used to easily hang the Thermochron from a hook or attach it to an object.

Fob colours available:
black, blue, green, yellow

FOB2: $3+GST (please specify colour)

These prices apply when ordered with logger.

Clear Fob for Thermocron

Clear Fob

These fobs assist in the handling and identification of your Thermochrons. They have an insert with a unique number printed on one side. For orders over 30, we can print a logo on the reverse side.

CLRFOB
Clear fob with numbered insert: $4+GST

CLRFOB-CUST
Clear fob with customised insert: $4+GST

Artwork fee applies.
Contact Esis for further details.

FOBART
Artwork for customised insert: $80+GST

Card Fob for Thermocron

Card Fob

Card Fob: A FOB the size of a credit card.

The Thermocron can be inserted into one section and an identifying card inserted.

Available in
Black, Red, Yellow, Green, Blue or Clear.

CARDFOB: $5+GST

These prices apply when ordered with logger.

NATA certificate

N-CERT-T: 3 point NATA certificate, Temperature only – $120+GST
N-CERT-TH: 3 point NATA certificate, Temperature and humidity – $350
N-CERT-HF: Handling fee (per order) – $15

iButton Capsule mechanical enclosure – moisture, solvents and pressure

iButton Capsule mechanical enclosureThe iButton® Capsule is a mechanical enclosure to protect Thermochron loggers from moisture, solvents and pressure.

The device consists of a base with the cavity for a Thermochron, a screw-in plug with O-ring to seal the enclosure, and a top with two stainless-steel screws to mount the iButton Capsule to a cable, e.g., to measure temperature at different levels within a liquid.

The cable is inserted into the notch of the plug where it is held in place by the matching protrusion of the top piece.

Data sheet on iButton Capsule (pdf, opens in a new tab)

Diameter: 25.4mm
Total height: 28mm (base: 16.5mm + plug: 6.35mm + top: 5.1mm )
Weight Empty: 18.4 grams

Note that the logger cannot be connected to a PC whilst in the capsule – it must be removed from the capsule for setup and downloading data.

Applications:
Autoclave Sterilization, Seawater temperature profiling, Monitoring of beverage production, Scientific research

TCCAP: A screw capped capsule to make the Thermocron totally waterproof. It will protect the Thermocron from moisture, solvent and pressure. Can be used with the TC; TCZ; TCS; TCX and TCU.

TCCAP iButton® Capsule: for small quantities – $80+GST

Dallas iButton part numbers (opens in a new tab)

FAQ on Thermocron Temperature Loggers

WHAT IS THE THERMOCHRON IBUTTON?

The Thermochron is a single-chip digital thermometer, thermostat, clock, calendar and data logging memory housed in the stainless steel iButton. Battery-powered and physically able to endure the most challenging environments, the Thermochron is ideal for data logging missions in the -40°C to 85°C temperature range.

WHERE WOULD I USE A THERMOCHRON IBUTTON?

You can use the Thermochron anywhere you want to monitor temperatures from -40C to 85C. Extremely durable and only 16mm in diameter, the Thermochron is ideally suited for remote and/or mobile thermal tracking in refrigeration units, trucks, crates, and incubators for purposes of chemical, food or other organic material storage, maintenance and transportation. It can stick to bottles, such as thermally sensitive chemicals, or mount on walls. For waterproofing applications, see the DS9107 iButton Capsule.

DS9107 Data Sheet (pdf, opens in a new tab)

WHAT'S THE LIFE SPAN OF THE THERMOCHRON?

The Thermochron lifespan is dependent upon usage conditions, specifically, how often the device samples, what environmental conditions (temperature) to which the iButton is exposed, etc. See the lifetime/lifespan graphs located in the Thermochron datasheets for lifetime expectancies based on usage conditions.

HOW DO YOU KNOW WHEN THE LITHIUM IS LOW OR NEARLY EXHAUSTED?

You can check the register that records the total number of conversions over the lifetime of the Thermochron. This register serves as a “gas gauge” because the primary consumer of lithium power is the conversion circuitry. By the way, the conversion process uses lithium even if the chip’s other “front end” functions are externally powered.

See the lifetime graphs at the end of the DS1921G datasheet.

DS1921G-F5 Datasheet (pdf, opens in a new tab)

WHAT DOES 'WATER-RESISTANT' MEAN FOR THE THERMOCHRON?

Thermochron iButtons have a grommet that creates a seal that is water-resistant but not waterproof (hermetic). They are IP56 rated (see below for link to more information). If you are using the iButton in an environment that exposes the iButton to high moisture content or is simply splashed with fresh or salt water, there should be no problem. Just wipe it off before touching it to the Blue Dot. If you have the need to submerge the iButton then we suggest that you use our DS9107 capsule to keep them dry while logging temperatures.

Some of our partners have other waterproof solutions for our Thermochrons. Click on the link below to see their products.

DS9107 iButton Capsule (pdf, opens in a new tab)

WHAT ARE THE TRUE TEMPERATURE LIMITS OF THERMOCHRONS?

Temperature ranges for all data loggers can be found in the table on this page.

Operating any logger above or below its thermal operating range can damage its internal battery or components.

If the logger records data while in an environment above or below its thermal operating range, the recorded data collected will not go above or below the specified operating range. The logger will continue to operate at temperatures above or below its operating range for an unspecified time before stopping due to lack of battery power. Depending on the length of time that the logger is exposed to temperatures outside of its operating range, the logger may continue operating properly.

Storage or operation above 50C significantly reduces battery life.

See each loggers datasheet for expected life span at different temperatures.

WHERE DO I GET SOFTWARE FOR THE THERMOCHRON?

Esis Pty Ltd

HOW LONG IS THE THERMOCHRON GOOD FOR (BATTERY LIFE)?

There are charts in the data sheets that show battery life. Battery life is effected by temperature and the rate of sampling. The higher the temperature or the quicker the sample rate, the shorter the battery life.

IS IT POSSIBLE TO USE THE THERMOCHRONS TO MEASURE THE INTERNAL TEMPERATURE OF LARGE MAMMALS?

Maxim does not recommend using the Thermochrons inside any living creature.

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