Delmhorst Instrument HT-3000 - Manual (Page 4)

INTRODUCTION
The model HT-3000 is a portable, battery-powered
meter for the measurement of ambient tempera-
ture, 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 acti-
vates. 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 immedi-
ate 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, Dewpoint, and Absolute Humidity readings
between Fahrenheit and Celsius. Absolute Humidity is dis-
played in GPK (grams per kilogram), when the HT-3000
is set in Celsius mode, and in GPP (grains per pound)
when set in Fahrenheit mode.
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.
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HT-3000.qxp:FX-2000 owners manual 4/21/09 3:46 PM Page 5