HT30 V3.0 08/07

4

Meter Operation

1.

Press the

/SET button to power the instrument on/off.

2.

Slide down the protective sensor cover before taking measurements.

3.

Press the MODE/

button to select the desired display mode: Wet Bulb Globe

Temperature Heat Index (WBGT), Air Temperature (TA), Black Globe Temperature

(TG), or Relative Humidity (RH). An icon will appear in the display indicating the

current selection.

4.

To select the preferred temperature unit (°F or °C), simultaneously press and release

the MODE/

and NEXT buttons. The F or C icon will appear in the display.

5.

The meter measures WGBT index with (OUT) or without (IN) direct sun exposure.

Hold down the MODE/

for more than 1 second to alternate between settings. The

IN or OUT icon will appear in the display.

Alarm Setting

The HT30 has a user settable heat stress index alarm. The HT30 will emit an audible beep

when the heat stress index (WBGT) reaches the level previously set by the user. The

alarm will continue beep until the measured heat stress index temperature falls below the

alarm level set by the user, or the meter is turned off. The setting range is from 68.0 to

99.0°F (20.0 to 37.2°C).

1.

To enter the alarm setup mode, hold down the

/SET button for more than 2 seconds

when turning the meter on.

2.

The current alarm setting will be displayed with the most significant digit blinking.

3.

Use the MODE/

button to increment the digit.

4.

To set the next digit, momentarily press the NEXT button.

5.

After all of the digits are set, press and hold the NEXT button for 2 seconds to return

to the measuring mode.

NOTE: The OUT icon will appear in the display If the new setting is out of the setting range

of the alarm.