General Tools and Instruments IRT730K - Manual (Page 9)

The High Temperature Alarm is activated when the temperature measured by the IRT is higher
than the HAL setpoint. The Low Temperature Alarm is activated when the temperature
measured by the IRT is lower than the LAL setpoint. In each case, the IRT730K responds by
sounding a second chirp (following the usual first chirp to indicate that a measurement was
made and stored) and flashing an icon on the bottom line of the LCD (Fig. 2, Callouts 13 and
14). The second chirp is the only audible indication that a temperature alarm has been
activated.
To change the unit’s emissivity setting and either alarm threshold, press and hold the MODE
button with the instrument powered on and operating in any mode.
Whatever the operating mode, pressing and holding the MODE button will cause the emissivity
icon
ε (Fig. 2, Callout 2) on the top line of the LCD to begin flashing. You now have 30 seconds
to change the emissivity value before the APO function activates. You can change
ε in 0.01
steps by pressing either the °C/°F button to decrease the value or the / button to
increase the value. To move up or down quickly, press and hold either button.
With
ε flashing, pressing the MODE button briefly saves the currently displayed value (whether
or not you have adjusted it) and changes the adjustment target to HAL. Pressing the MODE
button causes HAL to begin flashing on the bottom left of the LCD. Once HAL begins flashing,
you have 30 seconds to adjust its value up or down to any temperature within the unit’s
measurement range. Press the °C/°F button to decrease the value or the
/ button to
increase it. To move up or down quickly, press and hold the corresponding button.
Pressing the MODE button briefly with HAL flashing saves the currently displayed value and
changes the adjustment target to LAL. Pressing the MODE button causes LAL to begin flashing
on the bottom right of the LCD. Once LAL begins to flash, you have 30 seconds to adjust its
value up or down to any temperature within the unit’s measurement range. As before, press
the °C/°F button to decrease the value or the
/ button to increase it. To move up or down
quickly, press and hold the corresponding button.
Pressing the MODE button with LAL flashing returns the three-step sequence to its starting
point—with
ε flashing on the top line. The figure below shows the sequence in graphic form.
Be aware that, unlike values shown on the
primary and secondary readouts (all of which
have 0.1° resolution), LAL and HAL only have
1° resolution. In other words, do not mistake
the default value of HAL (1472°F) for 147.2°F.
RECALLING STORED READINGS
To recall the measurements made and automatically saved by the IRT730K during operation in
REC mode:
1. Power on the unit by squeezing the measurement trigger.
2. Release the trigger to exit SCAN mode. Doing so automatically stores the current IRT
measurement in memory. For the purpose of illustrating how stored measurements are
numerically tagged, assume that this reading is given the memory tag 83.
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