421509 Datasheet, PDF (5/12 Pages) Extech Instruments Corporation. – Dual Input, 3-Display Thermometer/Datalogger

HOLD Mode (Main Display only)
Press the HOLD button to enter the Data Hold mode, the "HOLD" annunciator will display.
When HOLD is selected, the thermometer freezes the reading on the main display only.
Press the HOLD button again to return to the normal measurement mode.
MIN/MAX with Time Record Mode (Main Display only)
Note: Auto Power OFF and several keys (Power, C/F, REL, SET, HI/LO, TYPE, and T1,
T2, T1-T2) are defeated in this mode
Press MIN MAX to enter the MIN/MAX recording mode; the meter will begin keeping track
of the highest (MAX), lowest (MIN), MAX-MIN, and Average (AVG) readings. There are
four displays (listed below) for this mode. Use the MIN MAX key to scroll through all four.
1. When the “REC” icon is on the display (top), the meter is displaying measurements
normally while it is recording.
2. With the “REC MAX” icon on the display, the meter continues taking measurements
but the main display shows only the highest (MAX) reading recorded. The Elapsed
Time (in hours, minutes, and seconds) is shown in the lower right LCD field. The
Timer shows when the MAX reading was taken.
3. With the “REC MIN” icon on the display, the main display shows only the lowest
reading recorded. The Time of the MIN reading is shown in the lower right LCD field.
4. With the “REC MAX-MIN” icon on the display, the main display shows the difference
between Max and Min.
5. With the “REC AVG” icon on the display, the main display shows only the average of
all the readings recorded. Note that the averaging limit is 22 hours. After 22 hours, the
last average reading display is held on the LCD.
The meter emits a tone when a new minimum or maximum value is recorded. Use the
HOLD button to pause recording (all values are then held). Press HOLD again to resume
recording. To exit the MIN MAX mode press and hold the MIN MAX button for more than 2
seconds until the “REC” icon switches off.
T1/T2 Button (Main Display)
Press this button to select which thermocouple input configuration is represented on the
main display; ‘T1’ will display for thermocouple input 1 or ‘T2’ for thermocouple 2. When
the meter is turned on, it is set to the display that was in use when the meter was last
powered off.
T1/T2 (Second Display)
Press this button to select which input is shown on the secondary display (lower left
display); T1 for thermocouple 1 or T2 for thermocouple 2. When the meter is turned on, it is
set to the display that was in use when the meter was last powered off.
T1-T2/Time (Third Display)
Press this button to select system time, date, or the differential between the two
thermocouples (T1-T2) for the third display (lower right display). When the meter is turned
on, it is set to the display that was in use when the meter was last powered off.
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421509 Version 2.0 10/07