StowAway TidbiT User`s Manual
Contents
1. Factors that affect the StowAway TidbiT s accuracy are the thermistor error component imperfections resistor variations and A D nonlinearities and quantization error difference between temperature steps Most StowAways use thermistors with a 0 2 C interchangeability in the range 0 C to 75 C The StowAway TidbiT model TBI32 05 37 uses a thermistor that has 0 1 C interchange ability Onset Computer Corporation s proprietary test procedures effectively eliminate the resistor and A D errors leaving only the thermistor error quantization error and a small residual calibration error The blinking LEDs Waiting for trigger Weak green blink every six seconds Accuracy Resolution F C Temperature F Waiting out delay Weak green blink every four seconds Logging Bright green blink every measurement and weak every two seconds between measurements If the StowAway TidbiT is in multiple sampling mode it will blink at each measurement not each time data is recorded Alarm A logger is out of range if it has recorded a value that is above the high alarm limit or below the low alarm limit The red LED will blink during the duration of the deployment instead of the green LED S D Ideal Logger What is quantization error 5 with an Ideally a logger would record a different temperature for infinite He gt number of each temperature applied to it The StowAway TidbiT T steps can store o2. ange 20 C to 50 C It will record temperatures up to 70 C but exposure to temperatures above 50 C or below 20 C will reduce the battery life For temperatures above the highest value in its range it will read its highest value and for temperatures below the lowest value in its range it will read its lowest value Notice To guarantee specified accuracy the TidbiT and Optic StowAway units should not be used in condensing environments and water temperatures higher than 30 C 86 F for more than eight weeks cumulatively Prolonged exposure will lead to measurement drift and eventual failure If your application temperatures and environment are questionable based on the above statement please contact Onset or your authorized Onset dealer for more information Five year battery life The StowAway Tidbit has a five year battery life in typical use This corresponds to 16 three month deployments in water 35 F to 80 F with 4 minute or longer intervals no multiple sampling and one offload per deployment Alternatively if the logger is used constantly in short duration applications the battery life can be substantially reduced Examples of the battery life in short deployments are 6 000 one hour deployments with no multiple sampling 5 000 two hour deployments with no multiple sampling and 70 four day deployments with multiple sampling Sampling intervals shorter than minute and or extended storage or deployment above 80 F will s
3. ep change is typically 20 minutes The logger is so small that you can fit a dozen of them in a coffee mug Temperature C 14 25 14 30 14 35 14 40 08 03 01 14 23 10 CE The CE Marking identifies this product as complying with all relevant directives in the European Union EU 1996 2011 Onset Computer Corporation All rights reserved Onset HOBO StowAway TidbiT and BoxCar are trademarks of Onset Computer Corporation Onset Computer Corporation 470 MacArthur Blvd Bourne MA 02532 Mailing PO Box 3450 Pocasset MA 02559 3450 Telephone 1 800 LOGGERS 564 4377 508 759 9500 Fax 508 759 9100 Email loggerhelp onsetcomp com StowAway TidbiT User s Manual Thank you for purchasing a StowAway TidbiT temperature logger The minimum optic logging system is comprised of these components the StowAway TidbiT temperature logger Optic Base Station TidbiT Coupler and logger software Launch and recovery Launching your StowAway TidbiT Connect the Optic Base Station to the host computer using the appropriate interface cable CABLE PC 3 5 for a PC and CABLE MAC HOBO for a Macintosh Place the StowAway TidbiT onto the TidbiT Coupler attached to the Optic Base Station Refer to the Optic Base Station User s Manual for proper alignment Refer to the software user s manual for launching procedures Recommended software BoxCar 3 6 or any version of BoxCar Pro Triggered launch and the StowAway TidbiT The S
4. ignificantly reduce battery life The battery is not replaceable 1 2 x 1 6 x 0 63 inches and 0 68 oz The shape of the StowAway TidbiT was chosen to minimize the logger s volume The thermistor has been placed on the PC board in the logger to provide enhanced protection for the sensor and further improve the already high reliability of these loggers The logger weighs 0 68 oz 19 5 g and is negatively buoyant Accuracy of two different temperature ranges Temperature accuracy and resolution Plot B Graph 4029 B Temperature Accuracy Model TBI32 20 C to 50 C The StowAway TidbiT logger s accuracy and resolution specifications are given in plot B and plot C The logger s accuracy specification is its maximum measurement nn error including the effects of thermistor error and quantization error In most cases the logger s actual accuracy is better than the specified value The logger s resolution is the difference between temperature steps Model TBI32 05 37 Range 4 C to 37 C 24 F to 99 F Model TBI32 20 50 Range 20 C to50 C 40 F to 122 F in Accuracy Resolution F Specified range is narrower than nominal range due to ai E precision calibration process The TidbiT will measure temperature in the grey area but Plot C Graph 4024 exposure to temperatures in this range will reduce the Temperature Accuracy TidbiT s battery life Model TBI 5 C to 37 C Individual calibration
5. ly sealed This means that the logger can be used in wet or dirty locations or even completely submerged The logger can be launched and readout directly to a host computer using the TidbiT Coupler the Optic Base Station and the appropriate interface cable Data can also be readout in the field with the Optic Shuttle Onset s unique field data transporter For data retrieval be sure to clean your logger of dirt and dust To clean your TidbiT use only a non abrasive mild soap and warm water with a non scratching sponge or cloth Any scratches or abrasions on the TidbiT s surface may impair communication For tougher cleaning jobs use a plastic polish such as Novus plastic polish 3050 J MAN TBI32 Hardware details Graph 1093 Time accur acy Timebase dependence At room temperature the logger s idea of time can vary from the actual time by as much as one hour per year 100 ppm a i iti re effect shown in Plot A i There is an additional temperature effect show ot 5 J g E A 7 Depth rated to 1000 feet u pa MAL Just for fun we tested the StowAway TidbiT at really high 8 pressures Although they worked at 5000 psi 10 000 ft water 2 sop depth equivalent we are not prepared to test all of them to ae 40 20 0 20 40 60 80 this depth We allowed a conservative factor of 10 rating Temperature C them to 1000 ft Plot A Operating temperature range 20 C to 50 C The StowAway TidbiT will operate properly in the temperature r
6. nly 255 different temperature values in its s monger temperature range If you exposed the logger to a slowly S boesbt iane rising temperature the logger would record a constant k of steps Actual Temperature
7. towAway TidbiT has an optional triggered launch Launch your logger choosing the triggered launch option The magnetically operated reed switch is activated when the TidbiT Coupler is reconnected to the logger and then removed The Optic Base Station and TidbiT Coupler are not necessary to trigger the launch Any strong magnet placed near the face of the logger will trigger the launch The StowAway Tidbit s green LED light will flash brightly four times to indicate successful triggered launch Seeing if the alarm has been tripped The StowAway TidbiT has two LEDs The green LED blinks during use if it has not seen out of range conditions see the software user s manual for how to set the alarm Note that the alarm can be set up to 70 C on the 20 C to 50 C TidbiT but we recommend staying within the 50 C range of the logger If it has recorded out of range conditions the red LED will blink When the StowAway TidbiT is full neither LED will blink Data recovery After the StowAway TidbiT has been launched remove the logger from the TidbiT Coupler and deploy the logger At the end of the deployment reconnect the logger to the TidbiT Coupler attached to the Optic Base Station for readout The StowAway TidbiT communicates at 1200 baud The cleverly optimized software reads out 8K of data in 1 5 minutes and 32K in 6 minutes Sealed logger designed for field operation The StowAway TidbiT uses optical communication because it is complete
8. value and then jump to a higher value recording that value for a while The difference between the steps is twice the quantization error since a perfectly calibrated logger will never be more than half a step away from the actual value Differences between loggers The calibration process adjusts the measured values of individual loggers with the same temperature range This means that two loggers will not necessarily have the same step values so that two loggers exposed to the same temperatures may report different values Each one will be correct within its accuracy The coffee mug logger test The freezing point of water is 0 C 32 F with only a tiny dependence on pressure and the salt levels found in normal tap water You can use this information to test the accuracy of your StowAway TidbiT logger Put crushed ice and water in an insulated container and completely submerge the logger in the ice water Place the container in a refrigerator to minimize temperature gradients Leave it in for fifteen minutes while logging to be sure the TidbiT reaches equilibrium Offload the data and blow up the end of your plot to check the logger s accuracy The actual temperature will be above 0 C though less than 0 1 C if you do everything right Five minute response time in water Plot D Response Time Plot D shows that the temperature reached 90 of the step change in about five minutes In air moving Im sec response time to reach 90 of the st
Download Pdf Manuals
Related Search