General Tools and Instruments IRT659K User Manual

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2. High Temperature Alarm (HAL). HAL can be set to any integral

temperature value from -58° to 1202°F (-50° to 650°C)—the operating
range of the IRT659K. The default (factory preset value) is 1210°F
(650°C)—the highest temperature that the unit can measure.

3. Low Temperature Alarm (LAL). LAL can also be set to any integral

temperature value from -58° to 1202°F (-50° to 650°C). The default
(factory preset value) is -58°F (-50°C)—the lowest temperature that the
unit can measure.

The presetting of the high and low temperature alarms to the high and low
limits of the instrument’s measurement range is a convenience. If you never
change the value of HAL or LAL (because you choose not to use temperature
alarms) from its default value, you will never be bothered by an alarm
inadvertently sounding because you forgot to reset an alarm threshold. Neither
alarm can be disarmed.

To change the unit’s emissivity value and either alarm threshold, press
and hold the MODE/SET button with the instrument powered on and
operating in any mode.

Whatever the operating mode, pressing and holding the MODE/SET button will
cause the emissivity icon

ε to begin flashing. You can now adjust the emissivity

value (shown in the dedicated readout at the middle right of the LCD (Fig. 2,
Callout I) up or down in 0.01 steps by pressing either the

LOG button

(Fig. 1, Callout G) or the °F/°C

button (Callout H). To move up or down

quickly, press and hold the corresponding button.

Once the emissivity icon

ε begins flashing, pressing the MODE/SET button

again changes the adjustment target to LAL. With LAL flashing, you can adjust
its value up or down to any temperature within the unit’s measurement range
by pressing either the

LOG button or the °F/°C

button. To move up or

down quickly, press and hold the corresponding button.

Pressing the MODE/SET button with LAL flashing changes the adjustment
target to HAL. With HAL flashing, you can adjust its value up or down to any
temperature within the unit’s measurement range by pressing either the

LOG button or the °F/°C

button. To move up or down quickly, press

and hold the corresponding button.