Manual NTech Seawatch UV Master (page 4 of 7) (English)

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! To prevent user getting UV over-exposure, this

Watch includes two UV Index Alarms. They are

the Upper UV Index Alarm and Lower UV Index

Alarm.

! These UV Index Alarms can be set separately by

the user. Check the coming '5.7 Setting the Upper

and Lower UV Index Alarms' Section for more

detail on how to set the UV Index Alarms.

! When one UV Index Alarm has been set, the

corresponding bar segment will be flashing on

UV Index Alarm Sound

! In all of the modes: Whenever the Current UV

Index is equal to or larger than the Upper or

Lower UV Index Alarm, the Watch starts beeping

for about 10 seconds.

UV Index Alarm Indicator

! In all of the UV Index displaying modes: When the

Current UV Index equal to or larger than the

Lower UV Index Alarm, the 'Rays' of the UV Index

Alarm Indicator starts flashing on the display.

! In all of the UV Index displaying mode: When the

Current UV Index equal to or larger than the

Upper UV Index Alarm, the whole UV Index Alarm

Indicator starts flashing on the display.

the

display.

- UV Index Alarm

the whole UV Index

Alarm Indicator flash

the UV Index Alarm

Indicator appear steadily

Current

UV Index

UV Index Mode

The UV Index Alarm -

UV Index

Time

'beep'

for 10

seconds

'beep'

for 10

seconds

UV Index

Alarm Icon

the 'Ray' of the UV Index

Alarm Indicator flash

the Upper

UV Index

'HI' Alarm

the Lower

UV Index

'LO' Alarm

Current UV Index

bar segments

Lower UV Index Alarm

represents by the

flashing bar segment

Upper UV

Index Alarm

represents by

the flashing

bar segment

5.6 UV Index Mode

(Current UV Index Display)

Alarm Sound and UV Alarm Indicator

should not need

The Watch

for ,

difference between the place of use and cali-

bration of the Watch. For normal usage, you

! DO NOT attempt to calibrate the UV index unless

you have the following items to determine the

Calibration Factor (CAL):

DO NOT use the UV Index broadcasted by the

local weather station as the correct UV index, it

may NOT the correct one at your place when you

calibrating your Watch, this is because:

minute mean UV Index to public. It is different

from the instantaneous UV radiation that your

Watch is now sensing.

UV Index at your location may not be

identical to the one at weather station if the two

cloud conditions are not alike.

Check the coming '5.9 To Determine the

Calibration Factor (CAL)' Sections for more detail

on how to determine CAL.

Location A

(with an Higher

UV Index)

Location B

(with a Lower

UV Index)

the Sun

UV Index Broadcasted

by Weather Station

UV Index Exhibited

by the Watch

15-minute mean

UV Index

May

NOT

equal to

Instantaneous

UV Index

5.8 UV Index Mode - Precautions to UV Index Calibration

to calibrate the Watch again.

's UV sensor has been calibrated

in the factory. The most possible cause

deviation is the Ozone thickness

1) Standard UV generator or

2) Correct immediate local UV Index

1) Weather stations usually broadcast the 15-

2) Cloud condition affects UV Index. Hence, the

The Cloud Effect on UV Index

The Time Frame Effect on UV Index

Ultraviolet

Radiation

'LO

'CAL'

'HI'

holdhold

scroll

faster

scroll

faster

hold

UV Index Mode

Setting Sequence

calibrate the UV Index, press and hold the [mode]

button for about 2 seconds to select the setting

display.

! When the 'LO' indicator appear: Press the

[start/stop] or [lap/reset] button to select the

Lower UV Index Alarm setting among 0 to 25

(select ' -- ' to turn OFF the alarm) by scrolling of

1 (hold down the button to scroll the setting faster).

! When the 'HI' indicator appear: Press the

[start/stop] or [lap/reset] button to select the

Upper UV Index Alarm setting among 0 to 25

(select ' -- ' to turn OFF the alarm) by scrolling of

1 (hold down the button to scroll the setting faster).

Note: To control the UV exposure by a two-level

alarm, set a smaller value (for example: 6) for the

Lower UV Index Alarm, and set a larger value (for

example: 10) for the Upper Index Alarm.

! When the above settings finished, either press

and hold the [mode] button for about 2 seconds

to exit the setting sequence or press the [mode]

button once to calibrate the UV Index.

! To calibrate the UV Index, check the coming '5.8

Precautions to UV Index Calibration', '5.9 To

Determine the Calibration Factor (CAL)' and '5.10

Calibrating the UV Index' Sections for more detail

on the UV Index Calibration.

UV Index Mode

5.7 UV Index Mode - Setting the Upper and Lower UV Index Alarms

scroll the

setting by

increment of 1

' Lower

UV Index

Alarm

Calibration

Upper

UV Index

Alarm

[mode] [mode]

[mode]

the setting

[start/stop]

[lap/reset]

[start/stop]

[lap/reset]

To set the Upper, Lower UV Index Alarm and

(Current UV Index Display)

scroll the

setting by

decrement of 1

! Determine the CAL by using the following rules:

1)Correct UV Index: The UV index produced

by a standard UV generator or other similar

means.

2)Exhibited UV Index: The UV Index exhibited by

the Watch when it is exposed to the previous

standard UV generator.

3)ADJ: The percentage change of UV Index.

Hence ADJ = ((Correct UV Index - Exhibited

UV index) / Exhibited UV index) X 100%

4)Calibration Factor (CAL): The value that to be

selected for the calibration. CAL= 25 + ADJ.

Example 1: To adjust the UV Index from 4.8

(Exhibited UV index) to 4.0 (Correct UV Index).

! ADJ = ((4.0 - 4.8) / 4.8) X 100 = -17;

! CAL= 25 + ADJ;

! Hence, CAL=25 -17 = 8.

Example 2: To adjust the UV Index from 7.8

(Exhibited UV index) to 8.0 (Correct UV Index).

! ADJ = ((8.0 - 7.8) / 7.8) X 100 = 3;

! CAL= 25 + ADJ;

! Hence, CAL=25 +3 = 28.

To resume the Watch to its original setting

for sensing UV radiation, select the default

value (25) as the CAL during the calibration.

Exhibited

UV Index

Standard UV Generator

(Correct UV Index)

the Watch

UV Sensor

5.9 UV Index Mode - To Determine the Calibration Factor (CAL)

How Exhibited UV Index

is obtained for determent of CAL

Ultraviolet

Radiation

14 16

Low UVIndex Al arm

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NTech Seawatch UV Master Manual

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