Wahl TM612, TM612A User Manual

TM612 and TM612A

Pocket RTD

Thermometer

User Manual

WD1020 Rev F
04/08/15

TM612

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Acknowledgements

Thank you for choosing this Wahl Instruments high accuracy measuring instrument. Wahl has been pro viding
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 def ects in material or
workmanship under normal us e 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 re turned to our factory, transportation charges prepaid,
within the above s tated 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 damage s,
following the use or misuse of instruments so ld by the Manufacturer. No ag ent is authorized to assume for
Manufacturer any liability except as set forth above.

TM612

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Unpacking Contents

The T M612 (a ll refere nces t o the T M612 also include the TM612A u nless otherwise indicated) was checked
mechanically and elect rically prior to shipment. The necessary precautions have been tak en to ensure it
reaches the user without being damaged.
Nonetheless, it is wise to make a quick check t o detect any damage tha t may have occurred during transport.
If this is the case, inform the carrier immediately thereof.
The standard accessories are the following:

• This users guide

• 4 AA batteries (1.5V).

• Wrist strap.

• Rubber boot

If s ervice or re-certification of your instrument is needed, please contact us via phone, fax or e-mail, f or a
Return Material Authorization (RMA) number.
If the unit is to be returned, it is preferable to use the original packag ing and return with transportation
charges prepaid.

WARRANTY & CALIBRATION

REGISTRATION at

www.palmerwahl.com/register

Registration is fast and easy. In about a minute you can
have your product automatically registered for Warranty
Protection and our Calibration Rem inder service. Let
Palmer Wahl help you protect your investment, and
maintain product accuracy and compliance with ISO and
other quality standards.
Questions? Call Customer Service
at 1-800-421-2853 or 828-658-3131,
Or email: [e-mail]

Wahl Instruments, Inc.
234 Old Weaverville Road
Asheville, NC 28804 USA

Phone: [phone]

828.658.3131

Fax: [phone]

e-mail:[e-mail]
website:www.palmerwahl.com

T

M612

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Contents

A. General ........ ..... .... .... ..... ..... ..... .......... ......... .... ..... ..... ..... .......... ......... ..... .... .... ..... .... 5

A.1 Introduction ....... ..... ..... .......... ......... ..... .... ..... ..... ..... ......... .... ..... .... ..... ..... ..... ......... 5

A.2 Parts ...... ..... ..... ..... .......... ......... .... ..... ..... ..... ..... ......... ..... .... .... ..... ..... ..... .......... .... 5

A.3 Safety..... ..... ......... .... ..... ..... ..... .......... .......... ......... .... .... ..... ..... ..... .......... .......... .... 5

A.3.1 Co mpliance with safety standards ...... ..... ..... .......... ......... .... ..... .... ..... ..... ..... ......... 5

A.3.2 Env ironmental conditions .... ..... ..... ......... ..... .... ..... ..... ..... ......... .... .... ..... ..... ..... .... 6

A.3.3 Wo rn devices .... ..... ..... ..... ......... ..... .... ..... ..... ..... .......... ......... .... .... ..... ..... ..... .... 6

A.3.4 Devic e destruction procedure .... ..... ..... ..... .......... ......... .... ..... ..... ..... .......... .......... . 6

A.3.5 Instr uctions ...... ..... ..... ......... .... ..... ..... ..... ..... ......... .... ..... .... ..... ..... .......... ..... .... 6

A.3.6 Making measur ements ....... ......... .... ..... ..... ..... ..... ......... .... ..... .... ..... ..... ..... ......... 6

A.3.7 Def ects and abnormal stresses .... .... ..... .... ..... ..... ..... .......... ......... .... ..... ..... ..... ...... 6

A.3.8 Def initions...... ..... ..... .......... ......... .... ..... .... ..... ..... ..... ......... ..... .... ..... ..... ..... ...... 7

A.4 Maintenance ...... ..... .... ..... ..... .......... .......... ......... .... ..... .... ..... ..... ..... .......... ......... .... . 7

B. Using the instrument .... ..... ..... ..... ......... ..... .... ..... ..... ..... .......... ......... .... .... ..... ..... ..... .... 8

B.1.1 The keyboard ......... ......... .... ..... ..... ..... .......... .......... ......... .... .... ..... ..... ..... ..... .... 8

B.1.2 The measuring and simulation terminals ........ ..... ..... ..... ..... ......... .... ..... .... ..... ..... .... 9

B.1.3 The USB connector ....... ......... ..... .... ..... ..... ..... .......... ......... .... .... ..... ..... ..... ....... 12

B.1.4 The screen .... .... .... ..... ..... ..... .......... .......... ......... .... ..... ..... ..... .......... .......... .... 12

B.1.5 Get ting started (after power-up) ..... ..... ..... ..... .......... ......... .... ..... ..... ..... ......... ..... 13

B.1.6 Main c haracteristics ..... .... ..... ..... ..... .......... ......... .... .... ..... ..... ..... .......... .......... .. 13

C. Mode Programming ..... .... ..... ..... ..... .......... .......... ......... .... .... ..... ..... ..... .......... .......... .. 14

C.1.1 Resistance or temp erature measurement using resistive sensors ........ ......... ..... .... .... .. 14

D. Related Functions....... ..... ......... ..... .... .... ..... ..... ..... .......... ......... .... ..... ..... ..... ..... ......... 16

D.1 Scaling....... ..... ..... ......... .... .... ..... ..... ..... ..... ......... ..... .... ..... ..... .......... .......... ......... 16

D.2 Differential measurements .... ..... ......... ..... .... ..... ..... ..... .......... ......... .... .... ..... ..... ..... .. 17

D.3 Calibrated sensors ........ .... ..... ..... .......... .......... ......... .... ..... .... ..... ..... .......... ..... ....... 18

D.4 Storage of acquisitions in progress. ..... .... .... ..... ..... ..... ..... ......... .... ..... ..... ..... .......... .... 20

E. Parameter settings ....... ..... .......... ......... ..... .... ..... ..... ..... ......... ..... .... .... ..... ..... ..... ..... .. 27

E.1 Contrast adjustment ..... ..... ..... ......... ..... .... .... ..... ..... ..... .......... ......... .... ..... ..... ..... .... 27

E.2 Date and time setting ..... ..... ..... .......... .......... ......... .... ..... ..... ..... ......... ..... .... ..... .... .. 27

E.3 “Preferences” setting. ..... ..... ..... ......... .... ..... ..... ..... ..... ......... .... ..... .... ..... ..... ..... ....... 28

E.3.1 Filtering setting. ..... ..... ..... ..... ......... .... ..... ..... ..... ..... ......... .... ..... .... ..... ..... ..... .. 28

E.3.2 Display resolution setting. ... ..... ......... ..... .... ..... ..... ..... ......... ..... .... .... ..... ..... ..... .. 28

E.3.3 Lighting duration setting. ........ .... ..... ..... ..... ..... ......... .... .... ..... ..... ..... .......... ....... 28

E.3.4 “Key beeping” setting. ....... .... ..... ..... ..... .......... ......... .... ..... .... ..... ..... .......... ....... 28

E.3.5 Language setting ....... ..... ......... .... ..... .... ..... ..... ..... .......... ......... .... ..... ..... ..... .... 28

E.3.6 Temperature unit setting .... ..... ......... .... ..... ..... ..... ..... ......... ..... .... .... ..... ..... ..... .. 29

E.4 “Maintenance” menu .. .... ..... ..... ..... ......... ..... .... ..... ..... ..... .......... ......... .... .... ..... ..... .. 29

E.4.1 Adjustment from the Maintenance menu ......... .... ..... ..... ..... ..... ......... .... ..... .... ..... .. 29

E.5 “About the instrument” menu ... ..... .......... .......... ......... .... .... ..... ..... ..... .......... .......... .. 31

F. Software Update ......... .... ..... ..... ..... .......... ......... .... ..... .... ..... ..... .......... .......... ......... ... 32

G. Technical specifications....... ..... ..... ......... ..... .... ..... ..... .......... ......... .... ..... .... ..... ..... ..... .. 33

G.1 Measurement Function ....... ......... .... ..... .... ..... ..... ..... .......... ......... .... ..... ..... ..... ......... 33

G.1.1 Resistance .... .... .... ..... ..... ..... ......... ..... .... ..... ..... ..... ......... .... ..... .... ..... ..... ..... .. 33

G.1.2 Temperature by resistive sensors. ... ..... ......... ..... .... ..... ..... ..... ......... ..... .... .... ..... .. 33

TM612

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A. GENERAL

A.1 Introduction

The TM612 is a portable RTD thermometer (compliant with EC standards). It is especially designed for
calibration and maintenance. It is us ed to measure resistance values or temperatures bot h on site and in the
laboratory.

The TM612 features a large number of related functions which extend its range of application:

• Storage of acquisitions and display in the form of tables or trend curves.

• Use of calibrated sensors with their coefficients of correction

A range of improvements facilitates its operation:

• Rapid access to all functions.

• Intuitive user interface.

• 160x160 graphic display

• Connection via 4 mm safety plugs or a miniature flat plug.

• Power supply via 4 AA batteries or rechargeable batteries with rapid internal charger (Option).

The device is housed in an ABS case with a rubber boot.

A.2 Parts

General characteristics:

• Portable device powered by 4 AA batteries (pack of Ni-MH storage batteries, 1.7 Ah optional).

• Hand strap for carrying and use on-site

• Graphic liquid crystal display: 160 x 160 pixels.

• Choice of language used for messages and programming of functions, gauges and parameters via

6-key keyboard + 1 navigator.

• Backlit dis play accessible via a keyboard key, with the possibility o f automatic black-ou t aft er a

specific programmable period of inactivity.

• Appearance: ABS case (with rubber boot).

• Dimensions: 6.18 x 3.35 x 1.77 inches (157 x 85 x 45 mm) (without rubber boot).

• Weight: 10.8 oz. (306 g) without rubber boot.

• IP54 rating in compliance with standard EN 60529

Accessories:

Part No. Name

12436-01 Rechargeable battery pack with charger

12436-04 4 pin RTD connector (

mating plug)

for TM612 and TM630

(and TC622)

12436-05 Carrying Case, hard plastic

12436-06 Rubber boot (replace

ment)

12436-07 Cable, USB 2.0A to Mini USB Type B, 5 pin, 6 ft. length

12436-32 4 pin RTD connector (

mating plug) for TM612A and TM630A

(and TC622A)

A.3 Safety

A.3.1 Compliance with safety standards

The device complies with the applicable standards in force on the subject of electrical safety (EN 61010) as
well as on the electromagnetic compatibility of the electrical measuring instruments (EMC: EN61326).

These instructions for use contain information and warnings which must be observed by the user to protect
the latter against the dangers of electricity, to ensure the safe operation of the device and to protect it against
any mishandling which could damage or compromise the safety of use of the device.

TM612

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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 +55°C, relative humidity: 10 % to 80 % (70 % at 55°C).
Storage and transport temperature range limit: - 30°C to + 60°C (without the batteries).

A.3.3 Worn devices

Worn electrical d evices can pollute the env ironment. We recommend you refrain from disposing of this device
in an ordinary waste bin, but rather that you use the recycling circuits available locally.

A.3.4 Device destruction procedure

Opening the d evice: unscrew the sc rew on the b attery compartment, followed by the 5 screws securing the 2
shells.
Separate the 2 shells. Separate the PCB from the upper shell.

With regard to the batteries, you will find them in the battery compartment (see commissioning chapter).

In t he case of the pack of batteries, there are 2 co ntaminants: NI-MH (Nickel-Metal Hyd ride) batteries and a
PCB. Separate these 2 items.

A.3.5 Instructions

The device was designed to operate safely if the instructions provided in the accompanying documents are
followed. Any other use may jeopardize the safety of the operator. Any use other than those specified in the
instructions is therefore dangerous and forbidden.

A.3.6 Making measurements

The measuring leads and wires must be in good condition and must be replaced if their insulation appears
faulty (insulating material cut, burned, etc).

Never exceed the protection value limits indicated in the specifications.

Before changing function, disconnect the measuring wires from the external circuit. When voltage
measurements are being made, even weak ones, keep in mind that the circuits may contain a dangerous
voltage for the operator when referenced to ground.

Do not make any measurements when the device is linked up to another device using the USB link or when
the batteries are being charged.

A.3.7 Defects and abnormal stresses

If you believe the device’s protection may have been compromis ed, switch off the device and prevent it fro m
being switched back on unexpectedly.
The protection may be impaired in the following cases, for example:

 The device is visibly worn.
 The device is no longer able to make precise measurements.
 The device was stored in unfavorable conditions.
 The device has undergone severe stresses during transport.

TM612

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A.3.8 Definitions

A.3.8.1 Definition of the category and degree of pollution

CAT II 60V:
This notion of categories determines t he maximum voltage which can be applied to the measuring inpu ts (it is
also referred to as the over voltage category). For the TM612, the ceiling over voltage is (DC or AC)

POL 2°:
The notion of pollution determines the clearanc e between circuits. Degree 2 authorizes temporary con ductivity
caused by condensation.

A.3.8.2 Table of symbols used

Symbol Name Attention: see the accompanying documents

Earth

Compliant with the European Union directives

60V CAT II Pol 2

Category II, Pollution 2.
Maximum common mode voltage compared with the ground=60V

A.4 Maintenance

The device must always be repositioned in accordance with the instructions provided herein. Any incomplete or
incorrect assembly could compromise the safety of the operator.

The authority responsible must regularly ensure that all safety-related items are not worn and ensure all the
preventive maintenance operations required are performed.

Before opening the device for any maintenance operations, you must make sure that all the wires are
disconnected from the appliance.

All adjustments, maintenance and repair work on the open device must be avoided as much as possible and,
when these are indispensable, they must be performed by qualified staff, who are well aware of the risks
involved.

T

M612

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B. USING THE INSTRUMENT

In order to use the device in a safe manner, all operators must read the paragraph on safety carefully, along
with the paragraph below.

B.1 Power-up

The device is delivered with 4 AA batteries 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 each battery.

To turn the unit ON, press the ON/OFF key until the first “Checking EEPROM” screen comes up. (This may
require pressing and holding the key for up to 5 seconds.)
To turn the unit OFF, press the ON/OFF key until the “Instrument in power off mode” screen comes up. Please
note: instruments, whose serial number ends in “B”, will not retain the time and date when powered off. If
time and date need to be retained, the unit can be put in standby mode.
To enter standby mode, press both the HOLD and ON/OFF buttons until the screen displays “Instrument in
standby mode”.
To return to normal operating mode from standby mode, press the ON/OFF key until the original screen comes
up. Please allow a minimum of 10 seconds between going into standby mode and returning from it.

B

.1.1 The keyboard

The keyboard features:

• 2 function keys (F1 and F2) for the selection of the various menus displayed on the screen.

• The navigator, consisting of 4 arrows (up (↑↑↑↑), down (↓↓↓↓), right (→→→→), left (←←←←).

• A clear key (CLEAR).

• A device on/off and backlighting on/off key (ON/OFF).

Press briefly to start the device. During operation, press briefly to turn the backlight on or off.
Press it longer for 2 seconds to turn off the device.

• A validation key (VAL).

• A HOLD key allows you to suspend a process temporarily (when pressed briefly). If you press it

longer, this key makes it possible to switch from measuring mode to emission mode and vice­versa.

Battery

compartment screw

TM612

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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.

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

T

M612

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TM612

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TM612A Connector

TM612

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B.1.3 The USB connector

The T M612 is fitted with a USB connector ( mini B) intended f or uploading new s oftware versions and device
adjustment.

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 1st field indicates the operating mode.

• The 2nd field indicates the date, time and battery charge.

• The 3rd field is reserved for icons indicating the operating mode (related functions: Scaling,

filtering, etc).

• The 4th field indicates the operating mode, the gauge and certain related

functions.

• The 5th field indicates the value of the measurement. T hese 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

field

indicating the
configuration by

pi

ctograms

4th field indicating the
measurement, the
gauge and the main
related functions.

5th field
indicating the
value of the
measurement
of the
transmission
setpoint (in
mV, °C, °F or
%)

6th field
indicating the
min, avg and
max.
measurement
values.

7th

field indicating

the functions of the
F1 and F2 keys.

USB port
(mini B connector)

US B port
(mini B connector)

TM612A
Connector

TM612
Connector

TM612
Connector