HOBO Single Channel Thermocouple Data Logger (UX100-014M) Manual
Connecting the Thermocouple Sensor
The logger can accept any 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
Setting up Alarms
You can set an alarm to trip on the logger when a sensor
reading rises above or falls below a specified value. 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.
Select the High Alarm checkbox if you want an alarm to trip
when the temperature rises above the high alarm value.
Type the reading next to the High Alarm checkbox or drag
the red upper slider in the Configure Alarms window.
3.
Select the Low Alarm checkbox if you want an alarm to trip
when the temperature falls below the low alarm value.
Type the reading next to the Low Alarm checkbox or drag
the blue lower slider.
4.
Set the duration before an alarm is tripped.
5.
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.
For example, the high alarm is set to 300°F and the duration
is set to 30 minutes. If Cumulative is selected, then an alarm
will trip once a sensor reading has been at or above 300°F
for a total of 30 minutes since the logger was configured;
specifically, this could be 15 minutes above 300°F in the
morning and then 15 minutes above 300°F again in the
afternoon. If Consecutive is selected, then an alarm will trip
only if all sensor readings are 300°F or above for a
continuous 30-minute period.
6.
Choose how long the logger should maintain the sensor
alarm once it has tripped. Select “Host has relaunched
logger” if you want the alarm to remain visible on the LCD
until the next time you relaunch the logger. Select “Sensor
reading within limits” if you want the alarm to clear once
the sensor reading returns to the normal range between
the high and low alarm limits. Select “Cleared with button
press” if you want the alarm to remain on until you press
the Alarm/Stats button on the logger.
7.
Click OK to save alarm settings.
Notes:
•
Once the logger is launched, alarms will trip as
determined by these settings. Logger alarms will display
on the LCD screen. Note that the alarm limits are only
checked when the logger’s LCD screen refreshes every 15
seconds.
•
The actual values for the high and low alarm limits are set
to the closest values supported by the logger based on
the thermocouple type. In addition, alarms can trip or
clear when the sensor reading is within the resolution
specification for each thermocouple type. This means the
value that triggers the alarm may differ slightly than the
value entered.
•
When you read out the logger, high and low alarm levels
will be displayed on the plot along with “Chan 1 Alarm
Tripped” and “Chan 1 Alarm Cleared” events showing
when the temperature alarm tripped and cleared. The
“Chan 1 Alarm Cleared” event contains the value that
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