Data Hold Function
1. Press “HOLD” button until “HLD” appears in display.
• The current reading is now held and will not change until the
HOLD function is cancelled (Fig 3)
2. Press “HOLD” button again to cancel.
• Hold function can be used for humidity, dew-point, dry bulb/T1,
Ext. Temp./T2, wet bulb and temp. differential
Dew Point Function
1. Press button until “DP” appears in the display. Select dew
point, T1 or delta T value in any mode while internal temperature
is active (Fig 4).
Wet Bulb Function
1. Press button until “Wb” appears in the display (Fig 4).
NOTE: WB is always visible without external pro b e .
External Temperature Function
1. Plug the external probe into the meter.
2. Press button until “T2” appears in the display (Fig 5).
Unit will now display external probe temperature.
NOTE: If the external probe isn't plugged into the meter, “T2” will not
appear on display or any delta temperature.
Operating Instructions
WARNING!
Be sure to open the sensor protection cap before taking measurements.
Auto Power Off (Sleep Function)
Unit will turn itself off after ten (10) minutes of non-use (factory
programmed). The auto power off delay offers 2, 5, 10, 20, 40, and
60 minute options. To change auto power off:
1. Press + HOLD buttons.
2. When “ ” appears in the LCD, release “HOL D” button.
Unit is now in non-sleep mode.
Mode Options
1. Turn the protective cap to the open position (Fig 1).
2. Press button to turn the unit on.
3. Press “˚C/˚F” button for 1 second to convert readings to desired
unit. Temperature relative humidity and wet bulb measurement
will be displayed simultaneously (Fig 2).
DTH31-MAN P. 2
(Fig 2)
(Fig 1)
(Fig 3)
(Fig 4)
(Fig 5)
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