Module No. 3582

Barometric Pressure and Temperature Measurement

You can use the watch to take barometric pressure and temperature readings for your current location.

img_BARO_TEMP_2022

Important!

Check the information at the link below to find out how to ensure correct readings.

Correcting Measured Barometric Pressure and Temperature Values (Offset)
Barometric Pressure and Temperature Reading Precautions

Measuring Barometric Pressure and Temperature

  1. Enter the Barometer/Temperature Mode.

    2. Navigating Between Modes

    Entering the Barometer/Temperature Mode starts measurement, and displays the barometric pressure and temperature at your current location, and a barometric pressure graph.

    After you enter the Barometer/Temperature Mode, the watch takes readings about every five seconds for three minutes. After that, a measurement is taken about every two minutes.

    3582_56_BARO_TEMP

    To re-trigger measurement, press (B).

    To return to the Timekeeping Mode, press (D).

Note

The watch will automatically return to the Timekeeping Mode if you do not perform any operation in the Barometer/Temperature Mode for about one hour.

Measurement ranges are shown below. [- - -] will appear for the measured value if it is outside the allowable range.
Barometric pressure measurement: 260 hPa to 1,100 hPa (7.65 inHg to 32.45 inHg)
Thermometer measurement: -10.0 °C to 60.0 °C (14.0 °F to 140.0 °F)

Checking Changes in Barometric Pressure Over Time

Your watch shows a graph of barometric pressure readings taken at two-hour intervals. You can view barometric pressure readings for the past 42 hours. The square (mark_square) at the far right of the graph indicates the latest barometric pressure reading.

BARO_5x5_Graph

Predicting Upcoming Weather

A trend like this:

Means this:
dot_up_BARO

Rising barometric pressure, which indicates that upcoming weather probably will be fair.
dot_down_BARO

Falling barometric pressure, which indicates that upcoming weather probably will be bad.

Note

Large changes in barometric pressure and/or temperature can cause past data readings to be plotted outside of the visible area of the graph. Though plots are not visible, the data is still maintained in watch memory.

Checking the Change Between Two Barometric Pressure Readings (Barometric Pressure Differential)

In the Barometer/Temperature Mode, the display shows the current measured value, and a graphic indicator of the differential between the automatically measured current value and the latest value measured at two-hour intervals.

Example: Barometric pressure differential of -3 hPa (approximately -0.09 inHg)

3582_57_Baro_Indicator

Note

The barometric pressure differential graphic indicator will not be displayed if the barometric pressure differential exceeds ±10 hPa, or if the barometric pressure measurement value exceeds the measurement range.

Sudden Barometric Pressure Change Indications

Whenever the watch detects a significant change in air pressure readings (due to sudden ascent or descent, or to the passage of a low-pressure or high-pressure area), it will beep to let you know. An arrow will also flash on the display at this time if the watch is in the Barometer/Temperature Mode, or if it is in the Timekeeping Mode with the barometric pressure graph displayed. The arrow that appears shows the direction of the pressure change. These alerts are called “Barometric Pressure Change Indications”.

This indication:

Means this:
dot_info_down_BARO_new

Sudden drop in pressure
dot_info_up_BARO_new

Sudden rise in pressure
dot_info_up_down_BARO_new

Sustained rise in pressure, shifting to a fall
dot_info_down_up_BARO_new

Sustained fall in pressure, shifting to a rise

Important!

To ensure correct barometric pressure change indication operation, enable it in a location where the altitude is constant (such as a lodge, camp area, or on the ocean).

A change in altitude causes a change in air pressure. Because of this, correct readings are impossible. Do not take readings while ascending or descending a mountain, etc.

  1. Enter the Barometer/Temperature Mode.

    2. Navigating Between Modes

  2. Hold down (B) for at least two seconds.

    3. If Barometric Pressure Change Indications are enabled, [INFO] [Hold] [On] flash on the display, and then [BARO] appears.

    3582_58_fl_BARO_TEMP

  3. To disable Barometric Pressure Change Indication, hold down (B) again for at least two seconds.

    4. [INFO] [Hold] [OFF] flash on the display, and then [BARO] disappears.

Note

If the Barometric Pressure Change Indication is enabled, readings are taken every two minutes even while the watch is not in the Barometer/Temperature Mode.

The barometric pressure change indication becomes disabled automatically 24 hours after it is enabled.

Time signal reception is disabled while Barometric Pressure Change Indication is turned on. Power saving is also disabled.

Power Saving Function

You will not be able to turn on Barometric Pressure Change Indication while the charge level of the watch’s battery is low.

Low battery power will also cause Barometric Pressure Change Indication to turn off.

Correcting Measured Barometric Pressure and Temperature Values (Offset)

The watch’s built-in pressure sensor and temperature sensor are adjusted at the factory and normally do not require correction. However, you can correct the displayed value if you notice major errors in readings.

Important!

The watch will not be able to produce correct barometric pressure readings if you make a mistake during the correction procedure. Check to ensure that the values you use for calibration produces correct pressure and temperature readings.

Before adjusting the temperature sensor, remove the watch from your wrist and leave it in the area where you plan to measure temperature for about 20 or 30 minutes to allow the case temperature to become the same as the air temperature.

  1. Enter the Barometer/Temperature Mode.

    2. Navigating Between Modes

  2. Hold down (E) for at least two seconds. Release the button when [TEMP] appears on the display.

    3. This causes the temperature reading to flash on the display.

    3582_59_BARO_TEMP

  3. Press (D) to select the temperature correction or barometric pressure correction screen.

    4. 3582_60_fl_BARO_TEMP

  4. Use (A) and (C) to change the value.

    5. Temperature Setting Unit: 0.1 °C (or 0.2 °F)

    Barometric Pressure Setting Unit: 1 hPa (or 0.05 inHg)

    Holding down (A) or (C) scrolls through settings at high speed.

    To return the barometric pressure setting to its initial factory default, press (A) and (C) at the same time.

  5. Press (E) to complete the setting operation.

Note

While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation.

Specifying the Barometric Pressure Unit

You can specify either hectopascals (hPa) or inches of mercury (inHg) as the display unit for barometric pressure values.

Important!

When Tokyo (TYO) is the Home City, the barometric pressure unit is fixed as hectopascals (hPa) and cannot be changed.

  1. Enter the Timekeeping Mode.

    2. Navigating Between Modes

  2. Hold down (E) for at least two seconds. Release the button when the name of the currently selected Home City appears on the display.

    3. Example: When your Home City is London

    3582_fl_SET_LON_comon

  3. Press (D) 12 times.

    4. This displays [UNIT].

    3582_UNIT_SET_comon

  4. Use (B) to select a barometric pressure unit.

    5. [hPa]: Hectopascals

    [inHg]: Inches of mercury

    3582_61_62_BARO

  5. Press (E) twice to complete the setting operation.

Note

While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation.

Specifying the Temperature Measurement Unit

You can select either Celsius (°C) or Fahrenheit (°F) as the temperature display unit.

Important!

When Tokyo (TYO) is the Home City, the temperature unit is fixed as Celsius (°C) and cannot be changed.

  1. Enter the Timekeeping Mode.

    2. Navigating Between Modes

  2. Hold down (E) for at least two seconds. Release the button when the name of the currently selected Home City appears on the display.

    3. Example: When your Home City is London

    3582_fl_SET_LON_comon

  3. Press (D) 12 times.

    4. This displays [UNIT].

    3582_UNIT_SET_comon

  4. Use (C) to select a temperature unit.

    5. [°C]: Celsius

    [°F]: Fahrenheit

    3582_63_64_TEMP

  5. Press (E) twice to complete the setting operation.

Note

While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation.

Barometric Pressure and Temperature Reading Precautions

Barometric Pressure Reading Precautions

The barometric pressure graph produced by this watch can be used to obtain an idea of upcoming weather conditions. However, this watch should not be used in place of precision instruments required for official weather prediction and reporting.

Pressure sensor readings can be affected by sudden changes in temperature. Because of this, there may be some error in the readings produced by the watch.

Temperature Reading Precautions

Body temperature, direct sunlight, and humidity all have an effect on temperature readings. To help ensure more accurate temperature readings, remove the watch from your wrist, wipe it dry of any moisture, and place it in a well-ventilated location not exposed to direct sunlight. You should be able to take temperature readings after about 20 to 30 minutes.

Back

Next