ThermoProbe TL2 User Manual

TL2 Instructions for Use

The TL2 is an affordable high precision digital thermometer. It has been designed for use in both laboratory and industrial
applications. Features of the TL2 are as follows:

• Configurable RTD and SPRT combinations

• Available 2 channel temperature measurement

• 0.001 degree resolution

• Implements ITS-90 or Callendar-Van Dusen calibration coefficients

• Displays temperature in Celsius, Fahrenheit, Kelvin or Ohms

• Backlit, Large LCD character display (Backlight AC powered unit only)

• USB Type ‘A’ PC interface

• USB Type ‘B’ flash memory interface

• User programmable relay output interface

• Detachable AC power cord

• IP50 enclosure rating

• Available as a portable model with battery power (with limited features)

Cautions

The TL2 and associated temperature probes are sensitive devices and should be handled with care. Care should be taken not to
submit the temperature probes to mechanical shock, over-heating or exposure to fluids at the probe to cable interface. Overheating
the probes beyond their calibrated temperature range, damage and/or contamination may cause sensor drift and instability.

Authorized Service

Service and Calibration should only be performed by ThermoProbe, Inc. or an authorized distributor.
Contact ThermoProbe for questions about setting up this software or using the TL2.

USER INTERFACE FRONT

Up Button

Select Button

Power Button

Channel Indicators

Down Button

Power Button (AC Unit) – Use the power button to save your settings (temperature units, display decimals, zero adjustments, etc.),
and to place the TL2 in ‘Standby’ mode. If you remove AC the power without putting the TL2 in Standby mode, the user settings
will revert to the previous settings.

Power Button (Battery Unit) – Used to power the unit On or Off. (Settings are saved when the unit is powered off.)

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Select Button - Activates the user settings menu and selects menu items.
Up and Down Buttons - Selects the display for channel 1 and channel 2, navigates the menu (display next/previous menu item).

Also, adjusts the zero correction when in the Zero Adjust Mode.

Channel Indication – Marker indicates which channel is currently being displayed. (For active display and menu functions)

USER INTERFACE REAR

Channel 1 Channel 2

Channel 1 &2 – Female sockets for probe connections.

USB1 - type ‘A’ socket for connecting flash USB devices (AC powered units only)

USB2 – type ‘B’ socket for PC interface cable (AC powered units only)

Relay Header – User configurable normally open or normally closed relay control (AC powered units only)

Power Switch – Used to turn AC powered units On and Off

USB1 USB2 AC power socket

Fuse

On/Off Switch

Relay header

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Interface Menu: (AC Powered Unit)

rELAY

Corr -

Displays Zero Correction

F (Fahrenheit)

AbS (Kelvin)

o (Ohms)

tHoU

(Thousandths)

donE -

Select to Exit Menu

donE - Select to Exit Menu

10 sec

30 sec

60 sec

1 hr

PoLL

donE -

Select to Exit Menu

donE -

Select to Exit Menu

HASHoFF

–

Dis

ables Checksum

donE -

Select to Exit Menu

SELECT

rECord – Data logging setup & control

FLASH

StArt/StoP

PC

rAtE

1 sec

UnItS

dEC

L-A-H – Displays Low, Average & High readings

HASH on – Enables Checksum

C (Celsius)

Hds(Hundredths)

EnAbLe/dISAbLE

SEt

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Interface Menu: (Battery Unit)

L-A-H

Corr -

F

AbS

o

tHoU

donE -

SELECT

UnItS

C (Celsius)

(Fahrenheit)

(Kelvin)

(Ohms)

dEC

Hds(Hundredths)

(Thousandths)

– Displays Low, Average

Displays Zero Correction

Select to Exit Menu

NOTES:

• All displayed values and changes are for the current selected channel only.

• To save settings, the Power Button must be pressed. This will set the unit to ‘Standby’.

• The low, average and high readings are cumulative from the time the TL2 is powered on. They are not

saved when the TL2 is shut down or put in standby and will re-start when the unit is turned on. The
low, average, and high readings will be displayed once the TL2's readings have stabilized (about 22
seconds.)

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USB Flash Drive Logging (AC powered unit only):

1. Insert a flash drive into the USB1 type ‘A’ socket on the back of the TL2.

2. From the record menu, select ‘FLASH’ and ‘StArt’.

3. The TL2 display will flash ‘ACCESS’ until the flash drive recording has started. (A ‘no DSC’ message will appear if the

flash drive is not detected).

4. The up/down arrow indicator will blink on the LCD display to indicate that logging is in process.

5. To stop the data logging, select ‘FL StoP’ from the menu. Wait for the ‘FL DonE’ message to display before removing the

flash drive from the TL2. (If the drive is removed before the logging has been stopped, the data will be lost.)

Once the flash drive data logging has been completed, the data can be opened on a standard PC.

Note: Each time the TL2 records to the flash drive it will create a new file numbered sequentially higher than the previous file. (ex:

0001.csv, 0002.csv, etc.)

1. Remove the flash drive from the TL2.

2. Insert the flash drive into a USB port on the PC.

3. Browse to the folder containing the flash drive contents.

4. The TL2 data will be contained in a .csv file that can be opened with either Microsoft Excel or a text editor such as Notepad.

5. The column format is as follows: Date, Time, Channel 1 reading, Channel 1 units, Channel 2 reading and Channel 2 units.

Polling Mode (AC powered unit only):

You can set the TL2 to send data on command. This is useful for people who write data collection software that will request data
only when it is needed. To place the TL2 in polling mode, select “POLL” as the sample rate to be used under the recording section of
the TL2 menu. (See Interface Menu Diagram) When the PC sends a question mark character (?) to the TL2, the TL2 will respond
with the temperature. When the TL2 is set to flash record mode, the polling feature will not work.

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Temperature controlled Relay (AC powered unit only):

The TL2 comes equipped with a switchable relay. This relay will toggle whenever the temperature crosses the set point threshold set
through the user menu. The provided screw-terminal header can be wired in two configurations:

• Terminals 1-2 are normally closed (NC) and will turn OFF (open) when the relay is set.

• Terminals 1-3 are normally open (NO) and will turn ON (close) when the relay is set.

Figure 1: Relay screw-terminal header

The relay function can be implemented from the user menu. For the relay function to be active, the user must select ‘EnAbLE’ from
the relay menu. Also from the relay menu, the temperature set point can be configured. (‘rELAY’ -> ‘SEt’) Use the Up & Down
buttons to select the desired setpoint. Ensure this setpoint is correct before selecting the ‘EnAbLE’ function. The relay set point will
remain the same regardless of the unit selection (C, F or K).

Once the relay has been toggled, it will remain in that state until the user disables it using the Select button. If desired, the user will
then need to re-enable the relay from the user menu.

Zero Correction

Over time, a sensor may experience a shift in temperature at different ranges of the instrument. Zero correction allows the user to
make an adjustment to the current channel temperature display that effectively corrects for this shift. This offset or ‘zero correction’
is applied to the entire effective range of the instrument. Each channel has its own zero correction.

NOTE: A zero correction made at a particular point may not correct the temperature at another point. It is recommended that the
instrument be fully calibrated annually to maintain acceptable temperature tolerances for the range of the instrument.

To view the zero correction for the current channel, select the “Corr” option from the menu.

To set a zero correction:

1. Use the function and arrow buttons to navigate to the “Corr” item in the menu. Press and hold the power button. While holding the
power button, press the function button until the "Adj" menu item appears. Release both buttons.

2. Press and release the function button again. The double arrows will flash indicating that you are in zero correction mode. Use the
up and down arrows to adjust the display temperature as desired. The adjustment will only apply to the channel on the display.

3. When you've adjusted the display, press and release the function button. Use the arrow buttons and the function button to save or
cancel the zero correction and exit zero correction mode.

4. To view the zero correction, use the function button and arrow buttons to navigate to the Corr menu item as before. This time,
press and release the function button. The display will show the zero correction for the selected channel and then return to
temperature display mode.

5. To save the zero correction, the Power Button must be pressed. This will set the unit to ‘Standby’.

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