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TC RELAUNCH - Thermochron Relauncher / Alarm Verifier (Discontinued)
TC Relaunch

TC RELAUNCH - Thermochron Relauncher / Alarm Verifier (Discontinued)



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The recommended replacement is the TDHC 400b Handheld Thermochron Downloader.
  • Re-Launch Missions, Verify Missions, Verify Alarms, Stop Missions. 
  • Launch parameters are taken from the Thermochron to be re-launched. 
  • Tests the temperature alarm registers of a DS1921. 
  • Green LED indicates “no alarms during mission”. 
  • Red LED indicates “alarms during mission”. 
  • Green + Red indicates "launch successful". 
  • Touch LED Indicates “mission in progress” status. 
  • Eliminates need for PC at the shipping/receiving dock. 
  • Battery lasts for 200,000 plus launch/verifications or 5 years. 
  • Very small (1.6” X 2.3” X .75”) ABS Enclosure. 
  • ESD Protection more than 27kV on iButton port.

The TC Relaunch is a rugged, handheld device that provides a low cost means of verifying the alarm status, stopping a mission in progress, and re-launching missions on the Dallas Semiconductor DS1921 family of Thermochron iButtons.

The TC Relaunch provides four primary functions:

Mission Verification - The TC Relaunch tests the state of the MIP (mission in progress) flag to determine if the DS1921 has a mission in progress. If the Thermochron has an active mission running, then the touch LED is flashed once, otherwise it will be flashed 10 times to indicate that the touched DS1921 does not have a mission in progress. In either case, the TC Relaunch then automatically proceeds to perform alarm verification.

Alarm Verification -The TC Relaunch looks at the stored alarm events and indicates if any have occurred during the current mission. If no alarm events have occurred the Green LED is turned on for 3 seconds. If alarm events have occurred the Red LED is turned on for 3 seconds.

Mission Stop -The TC Relaunch can be used to stop a mission in progress. This allows the DS1921 to stop taking temperature readings and maintain the log data already acquired. When a DS1921 is touched by the TC Relaunch, the touch LED in the upper left corner flashes once to indicate a successful touch. If the touch is held past the three second alarm indication period and for an additional 3 seconds the touch LED will flash 10 times to indicate that it has successfully stopped the mission in progress.

Mission Restart -The TC Relaunch can be used to restart a mission. First, stop any mission that may be in progress (see above), then re-touch the stopped DS1921. The touch LED will flash 10 times to indicate that there is no mission in progress. Continue to hold the TC Relaunch on the DS1921 for three seconds. The DS1921 will then be launched using the same parameters as those set when the Thermochron was previously missioned. This allows missions to be easily restarted without fear of the Thermochron's mission parameters being accidentally altered. While all previously logged data will be overwritten, the following parameters will be retained: Real-Time Clock Registers, Real-Time Clock Alarm, Low Temperature Threshold, High Temperature Threshold, Sample Rate, Roll Over, TLS, THS, and TAS. The successful re-launch will be indicated by both Red and Green LEDs being turned on for 2 seconds. Subsequent touches will indicate a mission in progress.
iButton and thermochron are registered trademarks of Dallas Semiconductor Corporation. TMEX is a trademark of Dallas Semiconductor Corporation.
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