POST 00453E : FREEZE WATCH ACTIVATION PROBLEM
Follow-up on Post 00430E
19 May 2002
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Dr. Birhan Altay, Chief, Control of Biological Products & Logistics
Management at the Ministry of Health in Ankara, Turkey
is reporting some problems of undue
activation of "FreezeWatch" indicators.
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During the Q-tag field study (see TechNet21 posting POST00430E - A NEW TIME
TEMPERATURE INDICATOR -- Q-tag of 24 February 2002) we have observed
unexpected activation of freeze indicators (FreezeWatch) that could not be
explained. I would like to hear whether anyone has any explanation to this.
Also, it would be good to find out if there had been similar problems
observed in other countries.
"FreezeWatch" (both 9800 and 9805 models) are used in our Q-tag field study
at all levels of transportation along with other temperature monitoring
devices. In two cases at different locations, a total of 4 "FreezeWatch"
from the same lot (type 9805) were activated at 4ºC in the refrigerators.
Refrigerator temperature is confirmed with electronic temperature logger
readings. Another incident occurred in another location, but this time at
room temperature (20ºC). Six "FreezeWatch" (type 9805) that were sent for
the study were found activated the next day while stored on the shelf. The
room is conditioned at 20ºC and this is confirmed again with electronic
temperature logger readings. Freeze indicators in the room were not exposed
to any physical force that could have been the only logical explanation for
them being cracked.
Thanks and regards,
Dr. Birhan Altay
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Moderator's note :
"FreezeWatch" model (record number 9805) is also known as 0ºC model (PIS
code E6/45) which bursts and releases blue liquid, staining the white
backing card if the indicator is exposed to temperatures below 0ºC for more
than an hour. The previous model (record number 9800 and PIS code E6/14)
with red liquid bursts at -4.5ºC.
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