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To confirm the temperature calibration, press the SET button (do not hold), and the humidity

will begin flashing.

2. Humidity Calibration. To increase the humidity to match your calibration source, press the

+ button. To increase rapidly, press and hold the + button. To decrease the humidity, press

the ALARM button. To decrease rapidly, press and hold the ALARM button.

To confirm the humidity calibration and return to normal mode, press the SET button (do not

hold).

Temperature Calibration Discussion: Temperature errors can occur when a sensor is placed too

close to a heat source (such as a building structure, the ground or trees).

To calibrate temperature, we recommend a mercury or red spirit (fluid) thermometer. Bi-metal (dial)

and other digital thermometers are not a good source and have their own margin of error. Using a local

weather station in your area is also a poor source due to changes in location, timing (airport weather

stations are only updated once per hour) and possible calibration errors (many official weather stations

are not properly installed and calibrated).

Place the sensor in a shaded, controlled environment next to the fluid thermometer, and allow the

sensor to stabilize for 24 hours. Compare this temperature to the fluid thermometer and adjust the

console to match the fluid thermometer.

Humidity Calibration Discussion: Humidity is a difficult parameter to measure electronically

and drifts over time due to contamination. In addition, location has an adverse affect on humidity

readings (installation over dirt vs. lawn for example).

Official stations recalibrate or replace humidity sensors on a yearly basis. Due to manufacturing

tolerances, the humidity is accurate to ± 5%. To improve this accuracy, the indoor and outdoor

humidity can be calibrated using an accurate source, such as a sling psychrometer or one step

humidpak calibration kits (reference Section 7).

3 Heat Index Safety Discussion

The following section is courtesy of the United States National Weather Service Office of Climate,

Water and Weather Services.

The Heat Index, sometimes referred to as the apparent temperature is given in degrees Fahrenheit. The

Heat Index is a measure of how hot it really feels when relative humidity is factored with the actual air

temperature.

To find the Heat Index temperature, look at the Heat Index chart below. As an example, if the air

temperature is 96°F and the relative humidity is 65%, the heat index (how hot it feels) is 121°F.

IMPORTANT: Since heat index values were devised for shady, light wind conditions, exposure to

full sunshine can increase heat index values by up to 15°F. Also, strong winds, particularly with very

hot, dry air, can be extremely hazardous.

The Heat Index Chart shaded zone above 105°F shows a level that may cause increasingly severe heat

disorders with continued exposure or physical activity.

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