Bosch GTC 12V-450 Professional handleiding

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22 | English

normalities in the functionality, you should have the

measuring tool checked by an authorised Bosch after-

sales service agent.

Starting Operation

Switching On For the First Time

You need to adjust a few basic settings when you switch on

the measuring tool for the first time or after resetting it to

factory settings. Select the required values by pressing the

top, bottom, left or right of the multi-function button(17).

Press the centre of the multi-function button(17) to confirm

your selection. Once you have confirmed the selection, the

next setting will show on the display. The total number and

the number of remaining settings is displayed in the status-

bar at the top.

The following basic settings are available:

– <Language>

– <Date format>

– <Date>

– <Time format>

– <Time>

Switching On and Off

To take a measurement, fold the protective cap(1) up-

wards. Make sure that the infrared sensor is not closed

off or covered while working.

To switch on the measuring tool, press the on/off

button(18). A start sequence will appear on the

display(19). The measuring tool begins to take measure-

ments as soon as the start sequence has finished and does

so continuously until it is switched off.

Note: In the first few minutes, the measuring tool may self-

calibrate several times, as the sensor temperature and ambi-

ent temperature have not yet been brought into line. Per-

forming sensor calibration again enables precise measure-

ment.

During this time, the temperature indicator may show ~. If

the ambient temperature fluctuates significantly, this effect

is increased. If possible, you should therefore turn on the

measuring tool a few minutes before starting to measure, so

that the tool can stabilise thermally.

To switch off the measuring tool, press the on/off

button(18) for longer than 1s. The measuring tool saves all

settings and then switches itself off. Close the protective

cap(1) to transport the measuring tool safely.

In the main menu, you can choose whether and after how

long the measuring tool automatically switches off (see

"Main Menu", page24).

If the battery pack or the measuring tool is not within the op-

erating temperature range specified in the technical data,

the measuring tool will switch off automatically after a brief

warning (see "Errors – Causes and Corrective Measures",

page26). Allow the measuring tool to reach the correct

temperature and then switch it back on.

Navigating in the Various Menus

Navigate in the various menus of the measuring tool:

– Open the menu bar: Press the centre or left of the multi-

function button(17) to confirm your selection.

The menu bars at the right and left appear on the display,

the main menu is highlighted.

– Browse in the left menu bar/navigate the main menu:

Press the top, bottom, left or right of the multi-function

button(17).

– Switch to the left or right menu bar: Press the left or right

of the multi-function button(17).

– Confirm selection/switch to the submenu: Press the

centre of the multi-function button(17).

– To switch from a submenu back to a higher-level menu:

Press the back button(18).

Measurement Preparations

Setting the emissivity for surface temperature

measurements

The emissivity of an object depends on the material and the

structure of its surface. This specifies how much infrared

thermal radiation the object emits compared with an ideal

radiant warmer (black body, emissivity ε=1) and accord-

ingly has a value between 0 and 1.

To determine the surface temperature, the tool performs a

contactless measurement of the natural infrared thermal ra-

diation emitted by the object at which the tool is aimed. To

ensure correct measurement, the emissivity setting on the

measuring tool must be checked before every measure-

ment and adapted to the measuring object if necessary.

The preset emissivities in the measuring tool are reference

values.

You can select one of the preset emissivities or enter an ex-

act numerical value. Set the required emissivity via the

<Measurement parameters>→ <Emissivity> menu (see

"Main Menu", page24).

u Temperature measurements will only be correct if the

emissivity setting and the emissivity of the object

match.

The lower the emissivity, the greater the effect of the reflec-

ted temperature on the measuring result. Always adjust the

reflected temperature when changing the emissivity. Set the

reflected temperature via the <Measurement

parameters>→ <Reflected temperature> menu (see

"Main Menu", page24).

Temperature differences allegedly shown by the measuring

tool may be caused by different temperatures and/or differ-

ent emissivity levels. If the emissivity levels are very differ-

ent, the depicted temperature differences may differ consid-

erably from the actual temperature differences.

If there are multiple objects made of different materials or

that have different structures in the measuring range, the

displayed temperature values are only accurate for the ob-

jects that match the emissivity setting. For all other objects

(with different emissivity levels), the displayed colour differ-

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