2. Pressing the
°C/°F
button changes the instrument’s default temperature unit from
°C to °F. To return to using °C units, press the
°C/°F
button again.
Another two functions are available whenever the IRT850K is operating in
any
mode:
1. To toggle the LCD backlight on and off, press the
Lock
button while squeezing and
holding the measurement trigger.
2. To shut off the twin lasers and LED flashlight, press the
°C/°F
button while squeezing
and holding the trigger. To turn on the lasers and flashlight, press the
°C/°F
button
again. Turning off the lasers and flashlight extends battery life.
OTHER DISPLAY INDICATIONS
Battery messages. Fig. 4 shows three of several other possible icons and alerts that could appear
on the IRT850K’s display. They are the
and
icons (the symbols for the “Lasers and
flashlight on” and “Backlight on” states discussed in the last section) and the
icon.
Whenever the
icon is on-screen, the IRT850K’s batteries are still sufficiently charged to
enable accurate measurements. By contrast, the
icon indicates that the batteries have
discharged enough to warrant replacing them immediately, although they still have enough
charge to support accurate measurements. Once the
icon appears, however, the
thermometer’s batteries have been fully discharged, making accurate measurements impossible.
To replace the batteries, follow the Setup Instructions on p. 5.
Alarm messages
. The following four types of alarm messages could appear on the IRT850K’s
display.
“Hi” or “Low” is displayed when the measured temperature is higher than
the HAL setpoint or lower than the LAL setpoint.
“Er2” is displayed when the thermometer is exposed to rapid changes in
ambient temperature. When this message appears, try giving the
thermometer some time (30 minutes or more) to adjust to the new working
temperature after it has stabilized.“Er3” appears when the ambient
temperature falls below 32°F (0°C) or rises above 122°F (50°C).
If this error message (or an “Error 5~9” message) appears, the IRT850K
must be reset. To do so, wait up to 1 minute for the APO function to engage
and then remove the batteries. Then wait at least one minute more, reinsert
the batteries, and attempt to make a measurement in Scan mode. If the error
message remains, contact General’s Customer Service department for help.
“Hi” or “Lo” is the message displayed if the target’s temperature is outside
the IRT850K’s measurement range of -76° to 2732°F (-60° to 1500°C).
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