Tenma 72-7712 User manual

P/N:
Digital
Thermometers
72-7715
72-7712

Model 72-7712/72-7715
OPERATING MANUAL

Table of Contents
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Title Page
Safety Information
Getting Started
Components
Display Elements
Buttons
Using the Thermometer
Changing Setup Options
Entering and Exiting Setup
Changing the Logging Interval
Changing the Thermocouple Type
Changing the Offset (T1)
Changing the Offset (T2)
Sleep Mode
Changing the Line Frequency
Setting the Time
Setting the Low Limit Alarm (Lo)
Setting the High Limit Alarm (Hi)
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Title Page
Measuring Temperatures
Connecting a Thermocouple
Displaying Temperatures
Holding the Displayed Temperatures
Turning on and off of display backlight
Viewing the MIN, MAX, and AVG Readings
Using the Offset to Adjust Probe Errors
Over Limit Alarm
Over Limit Signal Output
Debug
Using Memory
Starting and Stopping Logging
Viewing Logged Readings
Clearing Memory
Communicating with a PC
Enabling or Disabling Over Limit Signal Output
Enabling or Disabling Normal Temperature Compensation (NTC)
Enabling or Disabling Debug
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Maintenance
Replacing the Battery
Cleaning the Case
Specifications
Environmental
General
Electrical
Title Page
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Safety Information
The Model 72-7712 and 72-7715 Thermometers ( the thermometer) are
microprocessor-based, digital thermometers designed to use external J-, K-, T-, E-,
R-, S- and N- type thermocouples (temperature probes) as temperature sensors.
72-7712: T1 and T2, suitable for K-, J-, T- and E- type thermocouples
72-7715: T1 and T2, suitable for K-, J-, T-, E-, R-, S- and N- type thermocouples.
Equipped with over limit alarm, over limit signal output and user self-debug features.
Use the thermometer only as specified in this manual. Otherwise, the protection
provided by the meter may be impaired.
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Refer to safety information in Table 1 and the international symbols in Table 2.
Table 1. Safety Information
Before using the thermometer inspect the case. Do not use the thermometer if it
appears damaged. Look for cracks or missing plastic. Pay particular attention to the
insulation around the connectors.
Disconnect the thermocouple(s) from the thermometer before opening the case.
Replace the batteries as soon as the battery indicator ( ) appears. The possibility
of false readings can lead to personal injury.
Do not use the thermometer if it operates abnormally. Protection may be impaired.
When in doubt, have the thermometer serviced.
Do not operate the thermometer around explosive gas, vapor, or dust.
Do not apply more than the rated voltage, as marked on the thermometer (30V|),
between the thermocouple(s), or between any thermocouple and earth ground.
When potential differences are anticipated between the thermocouples, use electrically
insulated thermocouples.
When servicing the thermometer, use only specified replacement parts.
Do not use the thermometer with any part of the case or cover removed.
Warning
A warning identified conditions and actions that pose hazards to the user. To avoid
electrical shock or personal injury, follow these guidelines:
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Caution
A caution identifies conditions and actions that may damage the meter or the
equipment under test.
Use the proper thermocouples, function, and the range of your thermometer.
When carrying two thermocouples measurement, make sure there are no
potential differences between two thermocouples.
Do not attempt to recharge the battery.
Match the + and ñ polarities of the battery with the battery case.
Table 2. International Symbols
Refer to the manual for information about this feature
Complies with European Union directives
Battery
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Getting Started
Everything in this Users Manual applies to all Models of 72-7712 and 72-7715 unless
otherwise indicated.
To become familiar with the thermometer, study the following:
Figure 1 and Table 3 describe the components
Figure 2 and Table 4 describe the display.
Figure 3-a and 3-b and Table 5 describes the functions of the buttons.
Then read the following sections.
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Figure 1. Components
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Table 3. Components
Display
Buttons
Thermocuple T1 input
Thermocouple T2 input (72-7715 only)
USB Port
SIGN Port - Over Limit Signal Output (72-7715 only)
NTC
Battery Door
9V battery (6F22 )
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Table 4. Display Elements
Setup is in progress when the icon blinks
Display readings of maximum, minimum and average
Data Transferring is in progress
Logged readings are displayed when the icon blinks
Low battery. Replace the battery
The thermocouple type
The temperature units
Secondary Display 1
Under Calibration mode when the icon blinks. The displayed reading is fixed.
Secondary Display 2
The thermocouple measurement includes an offset. See ìChanging Setup
Optionsî
Readings are being logged when the icon blinks
Primary Display
The displayed readings do not change
The symbol of display backlight
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Figure 3 72-7712 and 72-7715 button set
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Table 5. Buttons
Press to turn the thermometer on or off
Press to turn the display backlight on and off.
Press to freeze or unfreeze the displayed readings
Press to switch between Celsius (∫C), Fahrenheit(∫F), and Kelvin (K)
Press to step through the maximum, minimum, and average readings.
Press and hold to turn off this display.
Press to step through K-, J-, T-, E- (R-, S-, N-) type thermocouple.
Press to toggle showing the T1, T2 and T1-T2 (differential temperature
measurement) in the primary or secondary display 1
Press to enter USB mode and the USB icon blinks. Press again to exit
USB mode.
Press to start or stop logging.
(See ìUsing Memory - Starting and Stopping Loggingî.)
Press to show logged readings
Press again to stop.
MAX MIN
HOLD
∫C ∫F
SEND
STORE
RECALL
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Press to start or exit Setup.
Press to scroll the Setup option you want to change
(See ìChanging Setup Optionsî)
After entering the Setup mode, press to increase the displayed setting.
(See ìChanging Setup Optionsî)
After entering the Setup mode, press to decrease the displayed setting.
(See ìChanging Setup Optionsî)
Confirm button.
(See ìChanging Setup Optionsî)
Table 5. Buttons
ENTER
SETUP
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Using the Thermometer
1) Plug the thermocouple(s) into the input connector(s).
2) Press the power button to turn on the thermometer.
3) Set the type of thermocouple(s) to be same of the type plug into the input
connector(s).
If no thermocouple is plugged into the selected input or the thermocouple is ìopenî
and the over-range positive deviation is too big, the display shows "_ _ _ _".
Changing Setup Options
Use Setup to change the following settings:
Logging interval Thermocouple type Offset (T1) Offset (T2) (72-7712 and
72-7715 only) Sleep Mode Line Frequency Time (S-T) Low Limit Alarm
(Lo) ( 72-7715 only) High Limit Alarm (Hi) ( 72-7715 only) Over Limit Signal
Output (SI) ON/OFF (72-7715 only) Normal Temperature Compensation (NTC)
ON/OFF DEBUG ON/OFF (72-7715 only) Save setting and return to normal
measurement mode.
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When the thermometer is in Setup mode, the display shows and blinks SETUP.
Press SETUP to start or exit Setup.
Press SETUP to scroll the Setup option you want to change after
The logging interval determines how often the thermocouple stores logged readings
in memory. You choose the length of the logging interval. See ìUsing Memoryî.
Press SETUP until the display shows INTERVAL.
The thermometer stores logged readings at the end of each logging interval. You can
select a logging interval by pressing or . Holding down or causes the number
to change more quickly. The maximum interval is 59:59 and the minimum interval
is 00:00. When the logging interval is 00.00, you need to store the readings manually
as the auto store feature will be disabled.
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1. Press SETUP until the display shows TYPE.
2. Press or to select the thermocouple type you want including K-, J-, E- type
(72-7715 have extra R-, S- and N- type).
1. Press SETUP until the display shows OFFSET and T1
2. Press or until the display shows the correct reading. The offset readings
range
1. Press SETUP until the display shows OFFSET and T2
2. Press or until the display shows the correct reading. The offset readings
range
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