User Manual

HOBO 4-Channel Thermocouple Data Logger (UX120-014M) Manual
1-800-LOGGERS 5 www.onsetcomp.com
For example, a logger started logging at 7:00 AM with a
logging interval set to 1 hour. If you press the Start/Stop
button to stop the logger at 8:45 AM and then press the
button again at 10:15 AM, logging will not begin
immediately at 10:15. Instead, logging will begin again at
11:00 AM, which is the next even interval time based on
your 1-hour logging interval. Therefore, depending on the
logging interval, the gap between the time you press the
button to resume logging and the time actual logging begins
could be significant. The faster the logging interval, the less
time will elapse before logging resumes.
• Specific Stop Time. Logging will end at a date and time
you specify. Note that if you also configure the logger for
a Push Button stop and to “Allow button restart,” then
the logger will stop logging at the date you select
regardless of how many times you stop and restart the
logger with the Start/Stop button.
11. Choose whether to keep the LCD on or off. By default, the
LCD will always remain on while logging. If you select the
“Turn LCD off” checkbox, the LCD will not show the current
readings, status, or other information while the logger is
logging. You will, however, be able to temporarily turn the
LCD screen on by pressing the Start/Stop button for 1
second if you select this option.
12. Click the Start button to launch the logger. Disconnect the
logger from the computer and deploy it using the mounting
materials (see Mounting the Logger). After logging begins,
you can read out the logger at any time (see Reading Out
the Logger for details).
Important note when using the HOBO U-Shuttle (U-DT-1) with
a HOBO 4-Channel Thermocouple logger (UX120-014M): If the
HOBO 4-Channel Thermocouple logger is configured to log
multiple channels with several statistics selected or with burst
logging enabled, the HOBO U-Shuttle can report erroneous
battery readings and may result in unexpected behavior. Only
use the shuttle with the HOBO 4-Channel Thermocouple logger
if you plan on minimal logging (such as logging thermocouple
channels only or two channels plus statistics logging). It is highly
recommended that you test your logger configuration with the
shuttle before deploying it to be sure the battery readings are
as expected and the offload works properly.
Connecting Thermocouple Sensors
The logger can accept up to four standard thermocouple sensor
of the appropriate type with standard thermocouple
subminiature connectors.
ANSI Standard Thermocouple Color Coding
Type-J Iron-Constantan Black
Type-K Chromel-Alumel Yellow
Type-S Platinum-Rhodium Green
Type-T Copper-Constantan Blue
Type-E Chromel-Constantan Purple
Type-R Platinum-Rhodium Green
Type-B Platinum-Rhodium Gray
Type-N Nicrosil-Nisil Orange
Refer to http://www.omega.com/techref/colorcodes.html for
additional details on color coding.
If the thermocouple has stripped-wire ends, male subminiature
connectors with screw terminals are available. You must use
the matching type of subminiature connector for the
thermocouple you are using.
Note that the subminiature connectors have one pin (negative
terminal) that is wider than the other (positive terminal). Make
sure the plug is inserted into the jack correctly as shown. Also
be sure to connect the correct thermocouple into the
appropriate channel as defined in HOBOware.
If you disconnect a thermocouple while the logger is logging, an
erroneous reading can appear on the LCD for that channel. In
addition, erroneous readings will be logged and saved in the
data file depending on the logging interval (e.g. if a
thermocouple is disconnected for 5 minutes and the logging
interval is set to 1 minute, then there will be 5 erroneous data
points while it was disconnected). If you reconnect it, the
correct values will display on the LCD again and will be logged
and saved in the data file.
Setting up Alarms
You can set an alarm to trip when a sensor reading rises above
or falls below a specified value on any of the thermocouple
channels. To set an alarm:
1. Click the Alarms button from the Launch Logger window. If
the Alarms button is disabled, make sure the Logging Mode
is not set to Burst. (Alarms can only be configured if the
logger is in Normal or Statistics mode.)
2. In the Configure Alarms window, select a thermocouple
from the list.
3. Select the High Alarm checkbox if you want an alarm to trip
when the temperature rises above the high alarm value for
that thermocouple. Type the reading next to the High Alarm
checkbox or drag the red upper slider in the Configure
Alarms window.
4. Select the Low Alarm checkbox if you want an alarm to trip
when the temperature falls below the low alarm value for
that thermocouple. Type the reading next to the Low Alarm
checkbox or drag the blue lower slider.
5. Set the duration before an alarm is tripped.
6. Select either Cumulative or Consecutive. If you select
Cumulative, then the alarm will trip when the time the
sensor is out of range over the course of the deployment is
equal to the selected duration. If you select Consecutive,
then the alarm will trip when the time the sensor is
continuously out of range is equal to the selected duration.