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TM612 and TM612A 

Pocket RTD 

Thermometer 

User Manual 

WD1020 Rev F 
04/08/15 

 

TM612

- 2 -

Acknowledgements 

Thank you for choosing this Wahl Instruments high accuracy measuring instrument. Wahl has been providing 
high quality, high accuracy measuring instruments for over 50 years. 

Because of this, we are able to continue our policy of continuous innovation, which has served our customers 
so well for the last 50 years. Wahl Instruments encourages your comments and would willingly accept any 
suggestions from you to help us to perfect our know-how and improve our future products. 

LIMITED GUARANTEE  
LIMITED LIABILITY 

Manufacturer warrants the TM612 and TM612A RTD Digital Thermometer to be free from defects in material or 
workmanship  under  normal  use  and  service  for  a  period  of  12  months  from  date  of  purchase.    The 
Manufacturer  agrees  to  repair  or  replace  any  product,  which  upon  examination  is  revealed  to  have  been 
defective  due  to  faulty  workmanship  or  material  if  returned  to  our  factory,  transportation  charges  prepaid, 
within the above stated warranty period.  This warranty is in lieu of all other warranties, expressed or implied 
and of all obligations or liabilities on its part for damages including but not limited to consequential damages, 
following  the  use  or  misuse of  instruments  sold  by  the  Manufacturer.   No  agent  is  authorized  to  assume  for 
Manufacturer any liability except as set forth above.   

Summary of Contents for TM612

Page 1: ...LIABILITY Manufacturer warrants the TM612 and TM612A RTD Digital Thermometer to be free from defects in material or workmanship under normal use and service for a period of 12 months from date of purchase The Manufacturer agrees to repair or replace any product which upon examination is revealed to have been defective due to faulty workmanship or material if returned to our factory transportation ...

Page 2: ...Instruments Inc 234 Old Weaverville Road Asheville NC 28804 USA Phone 800 421 2853 828 658 3131 Fax 828 658 0728 e mail rma palmerwahl com website www palmerwahl com TM612 4 Contents A General 5 A 1 Introduction 5 A 2 Parts 5 A 3 Safety 5 A 3 1 Compliance with safety standards 5 A 3 2 Environmental conditions 6 A 3 3 Worn devices 6 A 3 4 Device destruction procedure 6 A 3 5 Instructions 6 A 3 6 Ma...

Page 3: ...mishandling which could damage or compromise the safety of use of the device TM612 6 A 3 2 Environmental conditions In accordance with publication CEI 359 operating category I Range of application of standards from 0 to 2 200 m Reference temperature range 23 C 5 C relative humidity 45 to 75 Nominal operating range 10 C to 50 C relative humidity 20 to 80 non condensing Operating range limit 15 C to...

Page 4: ...es of 1 5V each To install the batteries into the compartment unscrew the screw on the back of the unit Once the batteries are in place screw the cover back on Observe the polarity an incorrect battery positioning could damage the device The correct polarity is indicated inside the compartment The figure below illustrates how to open the battery compartment as well as the correct positioning of ea...

Page 5: ...in circular connector These connector assemblies are used for measurements HOLD key F1 function key CLEAR key Navigation key ON OFF key Confirmation key VAL F2 function key Measurement Current terminal positive 4 wire voltage measurement terminal Measurement Current terminal negative 3 wire voltage measurement terminal TM612 10 ...

Page 6: ...e the gauge and certain related functions The 5th field indicates the value of the measurement These values are expressed in ohms C F or The 6th field indicates in measurement mode the minimum average and maximum values of the measurement Lastly the 7th field indicates the function of keys F1 and F2 1st field indicating the operating mode 2nd field indicating the Date time and battery charge 3rd f...

Page 7: ...emory B 1 6 Main characteristics B 1 6 1 Resistance temperature measurement The following gauges are available Gauge 400 Ohm for PT100 3600 Ohm for PT1000 Resolution display 10 mΩ or 0 01 C or 0 01 F 100 mΩ or 0 01 C or 0 01 F Scope of range 0 Ω to 400 Ω 220 C to 850 c 220 00 C to 850 00 C 0 Ω to 3600 Ω 220 C to 760 C 220 00 C to 760 00 C Scaling yes yes B 1 6 2 Electrical characteristics not to b...

Page 8: ... function allows definition of up to 11 correction values i e 10 segments in order to approach as much as possible the non linear response curve and to make the scale corrections according to each defined segment The pictogram is displayed on the screen in the active window when the scaling function is enabled The Define list of points menu makes it possible to program up to 10 lines of 2 values X...

Page 9: ...ation NULLING OFF will return the unit to its original display value When the relative measurement function is enabled the symbol is displayed on the measurement screen Scaling pictogram Pictogram of the TARE mode TM612 18 The NULLING Define menu makes it possible to program the value of the Tare positive or negative This value is obtained from the measurements Value Displayed Value measured Value...

Page 10: ...possible Confirm using the VAL key to return to the measurement screen To ensure the measurements are made using the calibration coefficients defined earlier go to the Configuration Function menu In the Probe field select sensor1 SONDE1 SENSOR1 below Note the Calibrated sensors are at the top of the list and their name is preceded by an Confirm the latter using the VAL key The chosen calibrated se...

Page 11: ...nfirm by pressing the VAL key TM612 22 RUN Launches the storage of data following the parameters set in the parameters function The pictogram is displayed on the measurement screen STOP Stops the storage in progress PARAMETERS Allows you to define The size of the acquisition max 10 000 values The sampling period from 0 5 S to 30 Min The type of trigger None low level high level If you have selecte...

Page 12: ...nd press the F1 key 1 For the second marker press the F2 key and using the navigation keys and move the cursor to the value to be marked value 2 and press the F1 key 2 TM612 24 In this particular example the graph will display values included between positions 9 and 20 Press the F2 key twice to reach the GRAPH function then press F1 to confirm At this level you can display the whole curve or a zoo...

Page 13: ...cters already entered Using the F2 key you can delete the characters entered Once you have entered the file name confirm by pressing the VAL key Open a burst Allows you to choose a specific burst from the list and open it to display the values At this level you can obtain information on the acquisition burst such as the number of measurements the date of acquisition the sensor used etc New free bu...

Page 14: ...hree types of resolution are available high 01 medium 1 and low 1 Select this resolution using the navigation keys and Confirm by pressing the VAL key E 3 3 Backlight duration setting In the same menu CONFIGURATION SETUP PREFERENCE you can control the duration of the backlight manual 10s or 1min Press the ON OFF key briefly to turn on the backlight for the selected duration 10s or 1min Press it ag...

Page 15: ...specified in chapter F said user may Either proceed with the appropriate adjustment according to the following procedure which requires equipment which features at least the same performance levels as the one used for the previous check Or return the device to the following address for checking and adjustment If service or re certification of your instrument is needed please contact us via phone f...

Page 16: ...alibration TM612 32 F SOFTWARE UPDATE The software is updated by the UPG32 program available from Palmer Wahl To find out which version of firmware is installed in your unit use the Configuration About menu The quickest way to find out if an update is available is to contact Customer Service at Palmer Wahl To update the firmware proceed as follows 1 If necessary install on the PC the USB driver fo...

Page 17: ...c wiring diagram detection 2 wires 3 wires or 4 wires In the 2 wire assembly the measurement includes the line resistances In the 3 wire assembly add the line resistances imbalance Measurement current 0 65mA G 1 2 Temperature by resistive sensors Sensor Scope of measurement Resolution Precision 1year Pt 50 α 3851 220 C 850 C 0 01 C 0 012 R 0 06 C Pt 100 α 3851 220 C 850 C 0 01 C 0 012 R 0 05 C Pt ...

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