AC Current Data Loggers U12-006 4-Channel External0 pages

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HOBO

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U12 4-External Channel Data Logger (Part # U12-006) Inside this package: Thank you for purchasing a HOBO data logger. With proper care, it will give you years of accurate and reliable measurements. The HOBO U12 4-External Channel data logger has a 12-bit resolution and can record up to 43,000 measurements or events. The four 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. HOBO U12 4-External Channel Data Logger Mounting kit with magnet, hook and loop tape, tie-wrap mount, tie wrap, and two screws.

Doc # 8161-C, MAN-U12-006 Onset Computer Corporation >

nnSpecifications

Measurement range External input channels (see sensor manual): 0 to 2.5 DC Volts Accuracy (logger only) α 2 mV 2.5% of absolute reading ѱ 2 mV 1% of reading for logger-powered sensors Resolution 0.6 mV Time accuracy ѱ 1 minute per month at 25C (77аF), see Plot A Operating range -20 to 70C (-4а to 158F) Operating temperature Logging: -20а to 70C (-4а to 158F) Launch/readout: 0а to 50C (32а to 122F), per USB specification >

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Onset has a range of external temperature sensors, AC current sensors, and cables for incorporating other sensors that are compatible with the U12 4-External Channel Data Logger. Measurement specifications for using Onset temperature and AC current sensors with this logger are provided in the sensor manuals. For compatible sensors, refer to the HOBO catalog, contact Onset Computer Corporation, or contact an Onset Authorized Dealer.

Humidity range 0 to 95% RH, non-condensing Battery life 1 year typical use (see ГBattery details on next page) Memory 64K bytes (43,000 12-bit measurements) Weight 46 g (1.6 oz) Dimensions 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). >

nnConnecting the logger nn

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 (32F) or above 50аC (122F). 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. Plot A

Important: Press this button for >

nn4-20mA input cable

3 seconds when logger is launched with Button Start or press for >

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This cable (part number CABLE-4-20mA) measures current from 0 to 20.1 mA. Do not expose to current above 20 mA or to negative current. Do not cut off the end of the gray cable where it connects to the blue and yellow wires, as it contains the precision resistor required for current measurement.

USB interface cable plugged into logger 1 second to record an event while logging >

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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.

nnVoltage input cable nn

The loggerВs external inputs can accept the voltage input cable (Onset part number CABLE-2.5-STEREO), which allows a voltage to be recorded. The input line must not be exposed to signals below 0 V or above 2.5 V. 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.

Voltage Input Cable Connections >

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Be sure to plug the external sensors 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.

Wire Connection Red Switched 2.5 V output White Voltage input Black Ground >

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Important: If you select an external channel, but do not plug the probe in, false data will be recorded for that channel.

nnSwitched 2.5 V output nn

The external input channels have a switched 2.5 V output. This signal can be used to power a sensor directly, or it can 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 1 ms before the external channels are measured and stays powered for 1 ms after the external channels are measured, as shown in the diagram. The striped area 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 V 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 if any of your voltage or current source common lines are not tied to earth ground. Input isolators may be needed in industrial environments to prevent errors caused by ground loops. 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 users guide for complete details on launching, reading out, and viewing data from the logger.

nnProtecting the logger nn

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 dryer 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.

ҩ 2004, 2005 Onset Computer Corporation Part #: MAN-U12-006, Doc #: 8161-C >

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