Delmhorst Instrument HT-3000 - Manual (Page 6)

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3. To turn the display lighter, press and hold the ROTATE but-
ton within 2 seconds. Release the button when the desired
contrast is achieved.
4. Once the desired contrast is achieved, release the ON/OFF
button within 2 seconds.
OPERATION SUMMARY
On/Off Hold Rotate Scale On/Off On/Off On/Off
(Hold) (Tap) + _ + _
Scale Rotate
Turns meter
ON and
OFF if held
for longer
than 2 sec-
onds Places
meter in
HOLD
mode: cur-
rent data
is held, all
data is
available
for display Alternates
between
T/RH and
D/AH data
set dis-
played on
screen Alternates
between F
and C
scales for
Temperature
and Dew
Point
readings Contrast
adjustment–
turns dis-
play
lighter. Alternates
the state
of the
backlight Contrast
adjustment–
turns dis-
play darker.
CALIBRATION &
MAINTENANCE
Continuous exposure to dirt and dust may shorten the life of the
RH sensor and also cause the meter to go out of calibration more
quickly. Avoid exposure to liquids and other contaminants.
Suggested factory calibration interval is once a year. Field calibra-
tion is not available for the HT-3000.
TECHNICAL SPECIFICATIONS
Temperature: -20°C to 70°C, -4°F to 158°F
Relative Humidity: 0-100%RH
Dewpoint: -40°C to 70°C, -40°F to 158°F
Absolute Humidity: 1 GPP to 2000 GPP, .1 GPK to 285 GPK.
HT-3000.qxp:FX-2000 owners manual 4/21/09 3:46 PM Page 7