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TM612 and TM612A
WD1020 Rev F
04/08/15
Pocket RTD
Thermometer
User Manual
TM612
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.
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.
- 2 -
The
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Summary of Contents for Wahl TM612
- Page 1 LIMITED LIABILITY Thermometer 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. 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.
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Page 2: Table Of Contents
TM612 Unpacking Contents The TM612 (all references to the TM612 also include the TM612A unless otherwise indicated) was checked mechanically and electrically prior to shipment. The necessary precautions have been taken to ensure it reaches the user without being damaged. -
Page 3: General
Storage and transport temperature range limit: - 30°C to + 60°C (without the batteries). The TM612 is a portable RTD thermometer (compliant with EC standards). It is especially designed for calibration and maintenance. It is used to measure resistance values or temperatures both on site and in the laboratory. -
Page 4: Maintenance
This notion of categories determines the maximum voltage which can be applied to the measuring inputs (it is also referred to as the over voltage category). For the TM612, the ceiling over voltage is (DC or AC) Power-up POL 2°:... -
Page 5: The Measuring And Simulation Terminals
ON/OFF key HOLD Navigation B.1.2 The measuring and simulation terminals The TM612 is fitted with 4 safety banana jacks (4 mm in diameter) and a 4-pin circular connector. These connector assemblies are used for measurements. Measurement: 3-wire Current terminal voltage/measurement... -
Page 6: The Usb Connector
(mini B connector) B.1.4 The screen The TM612 is fitted with a graphic LCD display with back-lighting. The display resolution is 160 x 160 pixels. In normal operating conditions, the display is divided up into seven horizontal fields: • The 1 field indicates the operating mode. -
Page 7: Getting Started (After Power-Up)
TM612 TM612 The table below provides a definition of each pictogram displayed on the screen: ROGRAMMING Symbol Description Scaling On hold C.1.1 Resistance or temperature measurement using resistive sensors Filtering %FS function (Full Scale) • The function type selection (Resistive sensor type) is made using the F1 key (Configuration Error Condition menu). -
Page 8: Related Functions
TM612 TM612 ELATED UNCTIONS Scaling The scale correction function performs conversion operations between the electrical values measured and the physical values converted. This linearization operation makes it possible to partially correct the errors induced by non-linear sensor/converter systems. The Scaling 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. -
Page 9: Calibrated Sensors
TM612 TM612 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 of the Tare Once the parameters have been set, the scaling is automatically enabled. To disable it, enter the Configuration/Scaling ON menu, select OFF and confirm by pressing the VAL key. -
Page 10: Storage Of Acquisitions In Progress
Repeat this operation for all the calibration points (maximum of 4). Name of calibrated sensor used Storage of acquisitions in progress. The TM612 is designed to store 10,000 values in one or more acquisition bursts. • Using the F2 key, enter the Mode menu. • Select the Memory function. - Page 11 TM612 TM612 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), •...
- Page 12 TM612 TM612 In this particular example, the graph will display values included between positions 9 and 20. At this level, it is possible to - display the trend curve entirely: press the F1 key (GRAPH). • Press the F2 key twice, to reach the GRAPH function, then press F1 to confirm.
- Page 13 TM612 TM612 At this level, you can find out some statistics on the measurements made (Minimum, Maximum, Average and Allows you to start a new acquisition burst. If a burst is under way, you will be requested to save it.
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Page 14: Parameter Settings
TM612 TM612 “Preferences” setting. ARAMETER SETTINGS Contrast adjustment E.3.1 Filtering setting. In the event of noisy measurements, you can filter the latter to make the value displayed on the screen more stable. In the CONFIGURATION/SETUP menu, you can adjust the display contrast. -
Page 15: Charges Prepaid
E.3.6 Temperature unit setting The TM612 may be adjusted using an instrument with a precision of more than 50 ppm. To adjust the device, go to the Configuration/Maintenance menu, enter the password 9456 and then press In the CONFIGURATION/SETUP/PREFERENCES menu, you can choose the temperature unit that will be the VAL key. -
Page 16: About The Instrument" Menu
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: If necessary, install on the PC the USB driver for communication with Wahl instruments. -
Page 17: Technical Specifications
TM612 ECHNICAL SPECIFICATIONS The precision expressions mentioned herein apply from + 18°C to + 28°C, unless otherwise specified, and are expressed in ± (n % R + C) where R = Reading and C = Constant expressed in practical units, for a confidence interval of 95%.