User's Manual
Heat Stress WBGT Meter
Model HT30
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact information. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied.
Introduction
Congratulations on your purchase of Heat Stress WBGT (Wet Bulb Globe Temperature) Meter. This meter measures and displays Heat Stress Index (WBGT), which is how hot it feels when humidity is combined with temperature, air movement, and direct or radiant sunlight. Black Globe Temperature (TG) monitors the effects of direct solar radiation on an exposed surface. It also measures air temperature (TA) and Relative Humidity (RH). Additional features include: selectable units of °F/°C, Auto power off with override, and a built-in RS-232 interface with optional 407752 Windows® software. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.
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HT30 V3.0 08/07 |
Meter Description
1. Black Globe temperature sensor
2. RH and Temperature sensors with protective cover
3. LCD display
4. 
/SET
5. NEXT
6. MODE/S
7. RS-232 interface
8. Battery compartment (on rear)
DISPLAY |
|
Symbol |
Function |
WBGT |
Wet Bulb Globe Temperature |
TG |
Black Globe Temperature |
TA |
Air Temperature |
RH% |
Relative Humidity |
OUT |
Indoor (no sun) |
IN |
Outdoor (in full sun) |
C/F |
Celsius/Fahrenheit |
|
Low Battery indicator |
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HT30 V3.0 08/07 |
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/Sbutton 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/Sand 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/Sfor 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/Sbutton 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.
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HT30 V3.0 08/07 |
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