LogTag TICT iS0°Tag®

Freeze Temperature Indicator

Freeze Temperature Indicator


  • Factory pre-configured to monitor a range of products including standard vaccines - WHO PQS Pre-qualified model available
  • Clear indication of alarm status at all times.
  • Monitors temperature and records daily statistics for up to 3 years
  • ‘Tick’/’Cross’ display shows temperature exposure below freezing point.
  • Robust and Accurate. Data collected is secure and cannot be manipulated.
  • Fits easily into packages and can be mailed via letter rate.
  • Logged, time stamped recordings before & after alarm event.


While the temperature remains above freezing point, the display shows a  symbol. If the temperature drops below freezing point for 60 minutes or more, the display shows a  symbol, which cannot be reset or deleted.

The iS0°Tag® can be used to monitor the temperature of any freeze-sensitive product such as vaccine, food, or specialty chemicals for up to 3 years. If a freezing event occurs the  symbol is displayed and the indicator is locked. Once locked, the indicator cannot be re-used.

The iS0°Tag® is factory configured with a low temperature limit of -0.5 °C for a duration of 60 minutes. The iS0°Tag® can also be factory configured for a different low temperature limit down to -5.0 °C for monitoring items with lower freezing points. An optional upper Alarm limit is also available.

Product Model TICT iS0°Tag
Temperature Sensor Measurement range -25 °C to +60 °C (-13 °F to +140 °F)
Recorder operating temperature range -25 °C to +60 °C (-13 °F to +140 °F)
Storage Temperature Range 0 °C to +60 °C (32 °F to +140 °F)
Rated Temperature reading accuracy Better than ±0.5 °C for -10 °C to +25 °C. Better than ±1.0 °C for -25 °C to -10 °C Better than ±1.0 °C for +25 °C to +60 °C. Actual performance is typically much better than the rated values. Accuracy figures can be improved by recalibration
Rated Temperature Reading Resolution 0.1 °C for -25 °C to +60 °C. LogTag Analyzer® currently displays to one decimal place of °C or °F. The native resolution is what is stored in the LogTag®
Sensor Reaction Time Typically less than 7 minutes (T90) in moving air (1m/s)
Recording Capacity Minimum & Maximum temperature for each of the 1096 days. Duration of excursion beyond alarm limits for each day. Up to 270 recorded real time temperature values each before and after the alarm has triggered.
Alarms Four factory pre-set alarm events, two over temperature and two under temperature. Each alarm event can be instant reject or accumulative reject. It can also be disabled.
Environmental IP64
Power source CR2032 3V LiMnO2 Battery (Fixed).
Battery Life Minimum storage life of 12 Months before ‘start’. Monitoring period: 1096 days (includes storage time)
Real Time Clock Built-in real time clock. Rated accuracy ±25ppm @ 25°C (equivalent to 2.5 seconds/day). Rated temperature coefficient is -0.034 ±0.006ppm/°C (I.e typically +/- 0.00294 seconds/day/°C)
Size 71.5 mm(W) x 33.0 mm(H) x 8.6 mm(T)
Weight 19 g
Sampling Interval Factory set from 5 to 15 minutes, typically set to 5 minutes
Logging Start Options Push button start. Factory configuration, typically set to 60 minutes
Recording Indication One low and one high alarm, indicated on the display
Case Material Polycarbonate
Logging Modes 1096 day statistics with temperature/time excursions and a mark entry. 540 real time readings

Starting the Indicator Press and hold the START/MARK button. “RUN” will flash. Release button when flashing stops. The Indicator enters factory preset delay or begins taking readings.

Monitoring When “RUN” appears on the display, the indicator is taking a temperature reading at the pre-configured interval (typically every 5 minutes). If an Alarm oc- curs, the  symbol is replaced by an symbol and the cor- responding alarm arrow is also displayed.

Stopping Press and hold the START/ MARK button. First the arrows will flash, then “RUN”. Release button when flashing stops. Indicator also stops when bat- tery is empty or an alarm occurs.

Factory Configurations: LogTag iS0°Tag® can be factory configured to support a range of different monitoring and alarm configurations.

Sampling interval:
5 minutes
Start Delay:
2 hours
Stop button:
Above temperature alarm:
≥ 10 °C instant
Freezer Alarm:
≤ -1 °C consecutive for 1 hour