joe defrancesco, gina koskela, peter sturman oregon state university
DESCRIPTION
Freezer Alarm &Backup Systems Preventing Sample Losses * * * * * * * * * * * * * * * * * * * * * * * *. Joe DeFrancesco, Gina Koskela, Peter Sturman Oregon State University North Willamette Research and Extension Center Aurora, Oregon. Freezer Alarm &Backup Systems. - PowerPoint PPT PresentationTRANSCRIPT
Freezer Alarm &Backup Freezer Alarm &Backup SystemsSystems
Preventing Sample LossesPreventing Sample Losses
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Joe DeFrancesco, Gina Koskela, Peter
Sturman
Oregon State UniversityOregon State UniversityNorth Willamette Research and North Willamette Research and
Extension CenterExtension CenterAurora, OregonAurora, Oregon
Different modes of freezer and alarm Different modes of freezer and alarm failurefailure Freezer malfunction experiences at NWRECFreezer malfunction experiences at NWREC
Description of backup natural gas Description of backup natural gas generatorgenerator
Description of alarm system and phone Description of alarm system and phone dialerdialer
Helpful hints to prevent loss of frozen Helpful hints to prevent loss of frozen samplessamples
Freezer Alarm &Backup Freezer Alarm &Backup SystemsSystems
Modes of Freezer and Alarm Modes of Freezer and Alarm FailureFailure
Interruption of electrical power to facilityInterruption of electrical power to facility Area-wide power outage; local power outage (power pole on Area-wide power outage; local power outage (power pole on
road)road) Freezers, Alarm and Dialer system, need to have separate Freezers, Alarm and Dialer system, need to have separate
power sourcepower source Failure of individual freezersFailure of individual freezers
Compressor failure (fan cover impediment; old age)Compressor failure (fan cover impediment; old age) Freezer plug accidently pulledFreezer plug accidently pulled
Alarm failure due to circuit breaker failure Alarm failure due to circuit breaker failure High ambient temperature → overload of circuit breaker to High ambient temperature → overload of circuit breaker to
freezersfreezers Have battery back-up on alarms and dialer just incase back-Have battery back-up on alarms and dialer just incase back-
up generator fails after a main power outageup generator fails after a main power outage Alarm batteries = 6 hr usage; 24 hr stand-byAlarm batteries = 6 hr usage; 24 hr stand-by UPS (dialer) battery = 2 hr usage; 24-30 hr stand-byUPS (dialer) battery = 2 hr usage; 24-30 hr stand-by
100 amp Normal service panel
TRTFreezer
UTCFreezer
Alarm Alarm
Prior to Alarm and Backup Prior to Alarm and Backup SystemSystem
100 amp Normal service panel
100 amp Automatic transfer switch
7 kw Natural Gas Generator
TRTFreezer
UTCFreezer
Alarm(w/ battery backup)
Alarmw/ battery backup
UPS(battery backup
for dialer)
Freezer Alarm and Backup Freezer Alarm and Backup SystemSystem
Dialer
Interruption of Electrical Power to Interruption of Electrical Power to FacilityFacility
Interruption of electrical power is sensed by a Interruption of electrical power is sensed by a Guardian 100 amp Automatic Transfer Switch Guardian 100 amp Automatic Transfer Switch (ATS)(ATS)
ATS simultaneously disconnects normal power ATS simultaneously disconnects normal power supply to freezers and alarms supply to freezers and alarms
Once ATS disconnects electrical power, it Once ATS disconnects electrical power, it activates a 7 kw natural gas generator and activates a 7 kw natural gas generator and connects power to the freezers and alarmsconnects power to the freezers and alarms
Generator is programmed to turn on once a week Generator is programmed to turn on once a week to test systemto test system
100 amp Normal service panel
100 amp Automatic transfer switch
7 kw Natural Gas Generator
TRTFreezer
UTCFreezer
Alarm(w/ battery backup)
Alarmw/ battery backup
UPS(battery backup
for dialer)
Freezer Alarm and Backup Freezer Alarm and Backup SystemSystem
Dialer
ATS
Main Power Source
Power from Generator
Power to Alarms and Horn
UPS Battery
Phone Dialer
Power to Freezers (2 separate circuits)
Phone Line
Power to Phone Dialer
Main Power
Alarms, Horn, and Dialer
TRT Freezer
UTC Freezer
Important: Separate circuits1. UTC Freezer2. TRT Freezer3. Alarms, Horn, Dialer
Individual Freezer Individual Freezer FailureFailure
Each freezer is equipped with temperature Each freezer is equipped with temperature sensing alarmsensing alarm
When alarm set point When alarm set point (25°F)(25°F) is exceeded for is exceeded for one hour, alarm system is activatedone hour, alarm system is activated Audible alarm (horn at freezer site)Audible alarm (horn at freezer site)
Contact information posted on freezer doorsContact information posted on freezer doors Automatic phone dialer calls each of the pre-Automatic phone dialer calls each of the pre-
programmed numbers on the emergency contact programmed numbers on the emergency contact list with a recorded messagelist with a recorded message
Programmed to delay for answering, then to repeat Programmed to delay for answering, then to repeat message 3x each number, then 3 repsmessage 3x each number, then 3 reps
System tested at beginning of season when System tested at beginning of season when freezers are empty (about every other month)freezers are empty (about every other month)
Install individual circuit breakers to alarms; Install individual circuit breakers to alarms; include battery backupinclude battery backup
Freezer Alarm SchematicFreezer Alarm Schematic
Automatic transfer switch
UPS
Auto phone dialer
Freezer alarm Freezer alarm
Alarm horn
Temperature sensor for freezer to sound alarm
Dial on each freezer indicates status of operation (connected to temp gauge in freezer); high temp may be due to defrost ~ Working (refrigeration) ~ Defrost
Helpful Hints to Prevent Helpful Hints to Prevent Sample LossSample Loss
Secure the freezer area Secure the freezer area Locks on freezer doorsLocks on freezer doors Indoors, with cool ambient air, is best to Indoors, with cool ambient air, is best to
prevent failureprevent failure Frozen jugs of water to keep freezers coolFrozen jugs of water to keep freezers cool Backup temp recorders in freezers to Backup temp recorders in freezers to
verify sample integrityverify sample integrity Install alarm and backup systems; test Install alarm and backup systems; test
regularlyregularly