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1. Press the button on the front of the logger for one second to record an event Both a button up and down event will be recorded This is useful if you want to mark the datafile at a particular point For example if the logger is located in an incubator you might press the button each time the door is opened The logger stores 64K of data and can record up to 43 000 samples and events combined Operation A light LED on the side of the logger confirms logger operation Channel 3 external input O Channel 4 ya external input Light va The following table explains when the logger blinks during logger operation The light The logger is logging Blinks once every one to four seconds the shorter the logging interval the faster the light blinks blinks when logging a sample The logger is awaiting a start because it was Blinks once every eight seconds until launch begins launched in Start At Interval Delayed Start or Button Start mode The button on the logger is being pushed for a Blinks once every second while pressing the button and then flashes rapidly once you release the button Button Start launch The light then reverts to a blinking pattern based on the logging interval HOBO U12 Temp RH 2 External Data Logger Protecting the logger The logger can be permanently damaged by corrosion if it gets wet Protect it from condensation If it gets wet remove the battery immediately and dry the circuit board with a hair dryer2. before reinstalling the battery Do not let the board get too hot You should be able to comfortably hold the board in your hand while drying Note Static electricity may cause the logger to stop logging To avoid electrostatic discharge transport the logger in an anti static bag and ground yourself by touching an unpainted metal surface before handling the logger For more information about electrostatic discharge visit our website at http www onsetcomp com Support support html Using external sensors The external input channels have a switched 2 5 V output This signal can be used to power a sensor directly or it can also be used to trigger an external circuit External sensors should draw no more than 4 mA total when powered The switched 2 5 V output turns on about 15 ms before the external channels are measured and stays powered for 48 ms after the external channels are measured as shown in the following diagram The striped bar shows the 16 ms period during which the logger samples the input signals When using multiple voltage and or current inputs the from your current source s and the 0 Volt line of your voltage source s are tied together at the logger If these lines are at different voltage potentials this may cause inaccurate readings or even damage your logger Keep in mind that these lines may also be tied to earth ground through your PC interface cable when connected to your computer Special precautions may be necessary i
3. 032 lithium battery Expected battery life varies based on the temperature and the frequency at which the logger is recording data the logging interval A new battery will typically last one year with logging intervals greater than one minute Deployments in extremely cold or hot temperatures or logging intervals faster than one minute may significantly reduce battery life To replace the battery 1 Disconnect the logger from the computer Unscrew the logger case Lift the circuit board and carefully push the battery out with a small blunt instrument or pull it out with your fingernail 2 3 4 5 Insert a new battery positive side facing up Carefully realign the logger case and re fasten the screws A WARNING Do not cut open incinerate heat above 85 C 185 or recharge the lithium battery The battery may explode if the logger is exposed to extreme heat or conditions that could damage or destroy the battery case Do not dispose of the logger or battery in fire Do not expose the contents of the battery to water Dispose of the battery according to local regulations for lithium batteries 2008 Onset Computer Corporation All rights reserved Part MAN U12 013 Doc 7662 C Onset and HOBO are registered trademarks of Onset Computer Corporation Other products and brand names may be trademarks or registered trademarks of their respective owners
4. HOBO U12 Temp RH 2 2 External Data Logger Part U12 013 Thank you for purchasing a HOBO data logger With proper care it will give you years of accurate and reliable measurements The HOBO U12 Temperature Relative Humidity 2 External Data Logger is a four channel logger with 12 bit resolution and can record up to 43 000 measurements or events The two external channels accept a variety of sensors including temperature and split core AC current sensors as well as 4 20 mA and voltage input cables sold separately The logger uses a direct USB interface for launching and data readout by a computer An Onset software starter kit is required for logger operation Visit www onsetcomp com for compatible software EEE LE EE eta Shae Inside this package e HOBO U12 Temp RH 2 External Data Logger e Mounting kit with magnet hook and loop tape tie wrap mount tie wrap and two screws Specifications Temperature 20 to 70 C 4 to 158 F Measurement range RH 5 to 95 RH External input channels see sensor manual 0 to 2 5 DC Volts Temperature 0 35 C from 0 to 50 C 0 63 F from 32 to 122 F see Plot A Accuracy RH 2 5 from 10 to 90 RH typical to a maximum of 3 5 See Plot B External input channels see sensor manual 2 mV 2 5 of absolute reading Temperature 0 03 C at 25 C 0 05 F at 77 F see Plot A RH 0 03 RH Temperature 0 1 C year 0 2 F year RH lt 1 per year typical RH
5. f any of your voltage or current source common lines are not tied to earth ground Using the RH sensor In order to take humidity measurements the temperature sensor must be used in conjunction with the RH sensor Conditions outside the recommended range may offset the RH signal Vapors may also affect the RH sensor The diffusion of chemicals into the sensor may cause a shift in both offset and sensitivity High levels of pollutants may cause permanent damage to the sensor Upon returning to normal conditions the RH sensor will slowly return towards calibration state by itself However prolonged exposure to extreme conditions may accelerate aging and eventually lead to a permanent shift To recondition the sensor do the following 1 Remove the battery 2 Warm 24 hours 80 90 C 176 194 F at lt 5 RH 3 Re hydrate 48 hours 20 30 C 70 90 F at 75 95 RH Mounting There are four ways to mount the logger using the materials in the mounting kit included with the logger e Use the hook and loop tape to affix the logger to a surface e Attach the magnet then place the logger on a magnetic surface Use the tie wrap and tie wrap mount to tie the logger to an object Fasten the logger to a surface with the two Phillips head screws The back of the logger has two inserts for the screws 32 mm 11 4 inches apart TO 32 mm 1 inch HOBO U12 Temp RH 2 External Data Logger Battery The logger requires one 3 Volt CR 2
6. hysteresis 1 minute per month at 25 C 77 F see Plot C bie ak Temperature 6 minutes typical to 90 Response time in airflow of m s 2 2 mph RH 1 miniite typical 6 90 cians ene Logging 20 to 70 C 4 to 158 F P S temp Launch readout 0 to 50 C 32 to 122 F per USB specification 58 x 74 x 22 mm 2 3 x 2 9 x 0 9 inches The CE Marking identifies this product as complying with all relevant directives in the European Union EU d Absolute Accuracy P Trebate Era ipper E EEA E E E EA or 20 40 60 g0 100 T fal f I fall 40 ei Relative Humidity 20 0 20 40 60 Temperature C Temperature C Plot A Plot B Plot C 2008 Onset Computer Corporation Part MAN U12 013 Doc 7662 C HOBO U12 Temp RH 2 External Data Logger Connecting the logger The U Family logger requires an Onset supplied USB interface cable to connect to the computer If possible avoid connecting at temperatures below 0 C 32 F or above 50 C 122 F 1 Plug the large end of the USB interface cable into a USB port on the computer 2 Plug the small end of the USB interface cable into the bottom of the logger as shown in the following diagram Important Press this button for 3 seconds when logger is es launched with Button Fann m Start or press for 1 second to record an event while logging USB interface TT cable plugged in
7. to logger If the logger has never been connected to the computer before it may take a few seconds for the new hardware to be detected Use the logger software to launch and read out the logger Important If you configure the logger to start with a button start be sure to press and hold down the button on the front of the logger for at least three seconds when you want to begin logging data Be sure to plug any external sensors if applicable into the side of the logger before logging begins Also select the correct sensors and activate the external channels in the logger software when configuring the launch Important If you select an external channel but do not plug the probe in false data will be recorded for that channel You can read out the logger while it continues to log stop it manually with the software or let it record data until the memory is full Refer to the software user s guide for complete details on launching reading out and viewing data from the logger Sample and event logging The logger can record two types of data samples and events Samples are the sensor measurements recorded at each logging interval for example the temperature every minute Events are independent occurrences triggered by a logger activity Examples of events recorded asynchronously during deployment include when the logger is connected to the host when the battery is low the end of a data file once the logger is stopped and button pushes
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