©2003 DELMHORST INSTRUMENT CO.
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INTRODUCTION:
The model HT-3000 is a portable, battery-powered meter for the measurement of
ambient temperature, relative humidity, and through calculation, dewpoint and
absolute humidity (grains per pound). The display can be read in either degrees
Fahrenheit (
°
F) or degrees Celsius (
°
C).
OPERATION:
1. Install the battery in the compartment located on the underside of the instrument
case handle.
2. Press and hold the ON/OFF button until the display activates. The meter is now
ON. The current software version will flash on the screen and then the meter
automatically enters its default mode: measured Temperature (
°
F) and Relative
Humidity (%) will appear on the display. T and RH readings are updated at a five
second interval.
3. Tap the ROTATE button to alternate between the display of T and RH and the
calculated values of Dewpoint and Absolute Humidity. A full set of all four values
is always in the meter memory after power up. This allows immediate access to
any measured or calculated value, even if the data of interest is not currently
displayed.
4. Press the SCALE (F/C) button at any time to switch Temperature and Dewpoint
readings between Fahrenheit and Celsius.
5. Press the HOLD button to freeze the displayed readings. The letter H appears at
the right of the first display line. The meter stops collecting additional readings,
but the SCALE and ROTATE functions are still available. Press the HOLD button
again to return the meter to normal operation.
6. Press and hold the ON/OFF button to turn the meter OFF. The meter must be in
normal operating mode and not in HOLD mode to turn it off.
AUTO-OFF:
The meter automatically switches OFF after 10 minutes without any button activity
and as long as the meter is not in HOLD mode. If the backlight is active, the auto-off
time is 35 seconds. (see below)
BACKLIGHT:
The meter is equipped with a display backlight, allowing use under poor lighting
conditions. Continued use of the backlight presents an extra drain on the battery and
significantly reduces expected battery life.
