Ambient Weather WS-1171B User manual

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Ambient Weather WS-1171B Advanced Weather Station
User Manual
Table of Contents
1Introduction.....................................................................................................................................2
2Product Features..............................................................................................................................3
3Getting Started ................................................................................................................................4
2.1 Parts List .......................................................................................................................................4
2.2 Recommend Tools.........................................................................................................................4
2.3 Thermo-Hygrometer Sensor Set Up..............................................................................................4
2.4 Display Console Set Up................................................................................................................5
2.4.1 Radio Controlled Clock (RCC)..............................................................................................6
2.4.2 Display Console Layout.....................................................................................................6
2.4.3 Sensor Operation Verification............................................................................................7
4Remote Sensor Installation .............................................................................................................7
3.1 Sensor Placement ...................................................................................................................7
3.2 Wireless Reception Considerations........................................................................................8
5Console Operation...........................................................................................................................8
4.1 Quick Display Mode ..............................................................................................................8
4.1.1 Quick Display Mode Quick Reference Guide........................................................................8
4.1.2 Quick Display Mode Operation .........................................................................................8
4.2 Set (Program) Mode...............................................................................................................9
4.2.1 Set Mode Quick Reference Guide......................................................................................9
4.2.2 Set Mode Operation ...........................................................................................................9
4.2.3 Setting Barometric Pressure.................................................................................................12
4.2.4 Setting Calibrated Humidity.............................................................................................12
4.2.5 Setting Calibrated Temperature........................................................................................12
4.3 Alarm Mode .........................................................................................................................13
4.3.1 Alarm Display......................................................................................................................13
4.3.2 Alarm Programming.........................................................................................................13
4.3.3 Cancelling the Alarm........................................................................................................14
4.3.4 Outdoor Alarm –Temperature vs. Dew Point..................................................................14
4.4 Min/Max Mode...........................................................................................................................15
4.5 Other Console Features ........................................................................................................15
4.5.1 Weather Forecasting.........................................................................................................15
4.5.2 Weather Forecast Initialization.........................................................................................15
4.5.3 Weather Icons...................................................................................................................16
4.5.4 Weather tendency indicator..............................................................................................16
4.5.5 Storm threshold indicator.................................................................................................17
4.5.6 Pressure threshold setting.................................................................................................17
4.5.7 Pressure Graph .................................................................................................................17
4.5.8 Restoring Lost Outdoor Temperature and Humidity Sensor ............................................17
5Glossary of Terms .........................................................................................................................17
6Specifications................................................................................................................................18
6.1 Wireless Specifications ...............................................................................................................18
6.2 Measurement Specifications .......................................................................................................18

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6.3 Power Consumption....................................................................................................................18
7Troubleshooting Guide..................................................................................................................18
8Accessories ...................................................................................................................................20
9Product Revisions .........................................................................................................................20
10 Liability Disclaimer..................................................................................................................21
11 FCC Statement..........................................................................................................................21
12 Warranty Information...............................................................................................................22
1Introduction
Thank you for your purchase of the Ambient Weather WS-1171B Advanced Weather Station with
Temperature, Humidity, Barometer and Advanced Forecasting. The following user guide provides step
by step instructions for installation, operation and troubleshooting. To download the latest manual and
additional troubleshooting tips, please visit:
http://ambientweather.wikispaces.com/ws1171b

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2Product Features
Figure 1
No
Description
No
Description
1
Radio Controlled Clock with Perpetual
Calendar
4
Forecast Icons
2
Indoor Humidity and Temperature
5
Barometric Pressure
3
Outdoor Humidity and Temperature
6
Barograph

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Figure 2
3Getting Started
Note: The power up sequence must be performed in the order shown in this section (remote
transmitter first, Display Console second) to avoid the console synchronization time out.
The WS-1171B weather station consists of a display console (receiver), and a thermo-hygrometer
(remote transmitter).
2.1 Parts List
QTY
Item
1
Display Console
Frame Dimensions (LxWxH): 7.25 x 4 x 1.25 in
LCD Dimensions (LxW): 4.25 x 2.50”
1
Thermo-hygrometer transmitter (WH2B) with mounting bracket
Dimensions (LxWxH): 3.5” x 2.5” x 0.9”
2.2 Recommend Tools
Philips precision screwdriver
Drill for mounting bracket
2.3 Thermo-Hygrometer Sensor Set Up
Note: To avoid permanent damage, please take note of the battery polarity before inserting the
batteries.
Remove the battery door on the back of the sensor with a Philips screwdriver (there is only one screw,
at the bottom of the unit). Insert two AAA batteries as shown in Figure 3.
We recommend lithium batteries for cold weather climates, but alkaline batteries are sufficient for

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most climates. We do not recommend rechargeable batteries. They have lower voltages, do not operate
well at wide temperature ranges, and do not last as long, resulting in poorer reception.
Replace the battery door and set screw. Note that the temperature and humidity will be displayed on
the LCD display. Looking at the back of the unit from left to right, the polarity is (-) (+) for the top
battery and (+) (-) for the bottom battery.
Figure 3
2.4 Display Console Set Up
Note: To avoid permanent damage, please take note of the battery polarity before inserting the
batteries.
Place the remote thermo-hygrometer about 5 to 10’ away from the display console (if the sensor is too
close, it may not be received by the display console).
Remove the battery door on the back of the display. Insert three AA (alkaline or lithium, avoid
rechargeable) batteries in the back of the display console. Looking at the back of the unit (left to right),
the polarity is (+) (-) for the top battery, (-) (+) for the middle battery and (+) (-) for the bottom battery.
The display will beep once and all of the LCD segments will light up for a few seconds to verify all
segments are operating properly.
Replace the battery door, and fold out the desk stand and place the console in the upright position.
The console will instantly display indoor temperature, humidity, barometer, tendency, date and time.
The remote search icon will turn on and should remain on for several minutes:
The outdoor temperature and humidity will update on the display within a few minutes.
Do not touch any buttons until the remote sensor reports in, otherwise the remote sensor search
mode will be terminated and the search icon will turn off. When the remote sensor data has been
received, the console will automatically switch to the normal mode, and all further settings can be
performed.
If the remote does not update, please reference the troubleshooting guide in Section 7.

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2.4.1 Radio Controlled Clock (RCC)
If your console is equipped with the Radio Controlled Clock (RCC), the icon WWVB will appear
above the time. WWVB is the NIST time signal radio station near Fort Collins, Colorado.
The RCC is received by the wireless transmitter, and passed to the console. After the remote sensor is
powered up, the sensor will transmit weather data for 30 seconds, and then the sensor will begin radio
controlled clock (RCC) reception. The sensor search icon will remain on:
During the RCC time reception period (maximum 10 minutes), no weather data will be transmitted to
avoid interference.
If the signal reception is not successful (normally during the day due to solar interference), the sensor
search will be cancelled, the outdoor temperature and humidity will update as normal, and the RCC
search will automatically resume every two hours until the signal is successfully captured. The regular
RF link will resume once RCC reception routine is finished. In some locations, RCC reception may
take a couple of days to receive the signal. The temperature and humidity data will continue to
transmit during this period.
Once the radio controlled time is RCC reception icon will turn on (reference Figure 4).
2.4.2 Display Console Layout
Note: The following illustration shows the full segments of the LCD for description purposes
only and will not appear like this during normal operation.
Figure 2

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1. DST (daylight savings time)
2. WWVB Radio Controlled Time
3. Time
4. Radio Controlled Clock reception
icon
5. Alarm ON indicator
6. Day of week/ time zone
7. Date
8. Indoor humidity display
9. Indoor temperature and humidity low
alarm and high alarm
10. Indoor temperature display
11. Temperature display units
12. Indoor temperature and humidity
alarm on indicator
13. Remote sensor transmit signal
indicator
14. MIN/MAX information
15. Dew point temperature display
16. Outdoor humidity display
17. Outdoor temperature and humidity
low alarm and high alarm
18. Temperature display units
19. Outdoor temperature display
20. General outdoor alarm icon
21. Weather forecast icon
22. Weather tendency indicator
23. Pressure with 24 hour history graph
24. Pressure high alarm
25. Pressure low alarm
26. Absolute or relative air pressure
selection
27. Barometer air pressure
28. Pressure display unit (inHg or hPa)
29. Pressure alarm ON indicator
NOTE: The snooze key is on the top of
the display console
2.4.3 Sensor Operation Verification
Verify the indoor and outdoor humidity match closely with the console and sensor array in the same
location (about 10’ apart). The sensors should be within 10% (the accuracy is ± 5%). Allow about 30
minutes for both sensors to stabilize.
Verify the indoor and outdoor temperature match closely with the console and sensor array in the same
location (about 10’ apart). The sensors should be within 4°F (the accuracy is ± 2°F). Allow about 30
minutes for both sensors to stabilize.
4Remote Sensor Installation
3.1 Sensor Placement
It is recommended you mount the remote sensor outside on a north facing wall, in a shaded area, at a
height at or above the receiver. If a north facing wall is not possible, choose a shaded area, under an
eve.
Direct sunlight and radiant heat sources will result in inaccurate temperature readings. Although the
sensor is weatherproof, it is best to mount in a well-protected area, such as an eve.
Use 3 screws (included) to affix the mounting bracket to the wall with a precision screwdriver.
Connect the remote sensor to the wall bracket. It is recommended to drill pilot holes first.

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Figure 4
Note: Make sure the sensor is mounted vertically and not lying down on a flat surface. This will
insure optimum reception.
3.2Wireless Reception Considerations
Wireless signals are impacted by distance, interference (other weather stations, wireless phones,
wireless routers, TVs and computer monitors), and transmission barriers, such as walls. In general,
wireless signals will not penetrate solid metal and earth (down a hill, for example).
The following is a table of reception loss vs. the transmission medium. Each “wall” or obstruction
decreases the transmission range by the factor shown below.
Medium
RFSignal Strength Reduction
Glass (untreated)
5-15%
Plastics
10-15%
Wood
10-40%
Brick
10-40%
Concrete
40-80%
Metal
90-100%
5Console Operation
Note: The console has four keys for easy operation: SET key, ALARM key, MIN/MAX key and
+key. There are four program modes: Quick Display Mode, Set Mode, Alarm Mode and Min/Max
Mode.
Any program mode can be exited at any time by either pressing the SNOOZE/LIGHT key (on the top
of the display console), or waiting for the 10-second time-out to take effect.
4.1 Quick Display Mode
4.1.1 Quick Display Mode Quick Reference Guide
Command
Mode
Settings
[SET]
Enter Quick Set Mode, Outdoor
Temperature vs Dew Point
Press [+] to toggle between outdoor
temperature and dew point.
[SET]
Relative Pressure vs Absolute
Pressure
Press [+] to toggle between relative pressure and
absolute pressure.
4.1.2 Quick Display Mode Operation
While in Normal Mode, press the SET key to enter the Quick Display Mode as follows (once for
outdoor temperature and dew point and twice for absolute pressure and relative pressure):
1. Display Outdoor Temperature and Dew Point. Press the MIN/MAX or +key to toggle
between outdoor temperature and dew point.
2. Absolute Pressure and Relative Pressure. Press the MIN/MAX or +key to toggle between

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absolute pressure and relative pressure.
4.2 Set (Program) Mode
4.2.1 Set Mode Quick Reference Guide
Command
Mode
Settings
[SET] + 3
seconds
Enter Set Mode, Daylight Savings
Time (DST)
Press [+] to toggle OFF and ON
[SET]
Time Zone (TZ)
Press [+] to increase. [MIN/MAX] to decrease
[SET]
12/24 Hour Format
Press [+] to toggle between 12 hour (12h) and
24 hour (24h) format
[SET]
Hour of Day
Press [+] to increase. [MIN/MAX] to decrease
[SET]
Minute of Day
Press [+] to increase. [MIN/MAX] to decrease
[SET]
Year
Press [+] to increase. [MIN/MAX] to decrease
[SET]
Month of Year
Press [+] to increase. [MIN/MAX] to decrease
[SET]
Day of Month
Press [+] to increase. [MIN/MAX] to decrease
[SET]
Temperature Units of Measure
Press [+] to toggle between degF and degC
[SET]
Indoor Temperature Calibration
Press [+] to increase. [MIN/MAX] to decrease
[SET]
Indoor Humidity Calibration
Press [+] to increase. [MIN/MAX] to decrease
[SET]
Outdoor Temperature Calibration
Press [+] to increase. [MIN/MAX] to decrease
[SET]
Outdoor Humidity Calibration
Press [+] to increase. [MIN/MAX] to decrease
[SET]
Barometric Pressure Units of
Measure
Press [+] to toggle between inHg and hPa
[SET]
Relative Pressure Calibration
Press [+] to increase. [MIN/MAX] to decrease
[SET]
Pressure Threshold for Forecast
Press [+] to increase. [MIN/MAX] to decrease
[SET]
Storm Threshold for Forecast
Press [+] to increase. [MIN/MAX] to decrease
[SET]
Exit Set Mode
4.2.2 Set Mode Operation
While in Normal Mode, press and hold the SET key for at least three seconds to enter the Set Mode.
The first setting will begin flashing. You can press the SET key again to skip any step, as defined
below.
Note: In the Set mode, press the +key or MIN/MAX key to change or scroll the value. Hold
the +key or MIN/MAX key for 3 seconds to increase/decrease rapidly.
Note: Press the SNOOZE key (or wait 30 seconds for the programming mode to timeout), and
the Set Mode will return to Normal Mode.
1. Daylight Savings Time (DST). The DST (ON or OFF) setting will begin flashing. Press the
+key to toggle between DST ON and DST OFF.
2. Time Zone Settings. Press the SET key again to adjust the Time Zone (TZ) setting.
Press the +key or MIN/MAX key to adjust the time zone from -12 to 12, based on the
number of hours from Coordinated Universal Time, or Greenwich Mean Time (GMT).
The following table provides times zones throughout the world. Locations in the eastern
hemisphere are positive, and locations in the western hemisphere are negative.

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Hours from
GMT
Time Zone
Cities
-12
IDLW: International Date Line West
---
-11
NT: Nome
Nome, AK
-10
AHST: Alaska-Hawaii Standard
CAT: Central Alaska
HST: Hawaii Standard
Honolulu, HI
-9
YST: Yukon Standard
Yukon Territory
-8
PST: Pacific Standard
Los Angeles, CA, USA
-7
MST: Mountain Standard
Denver, CO, USA
-6
CST: Central Standard
Chicago, IL, USA
-5
EST: Eastern Standard
NewYork, NY, USA
-4
AST: Atlantic Standard
Caracas
-3
---
São Paulo, Brazil
-2
AT: Azores
Azores, Cape Verde Islands
-1
WAT: West Africa
---
0
GMT: Greenwich Mean
WET: Western European
London, England
1
CET: Central European
Paris, France
2
EET: Eastern European
Athens, Greece
3
BT: Baghdad
Moscow, Russia
4
---
Abu Dhabi, UAE
5
---
Tashkent
6
---
Astana
7
---
Bangkok
8
CCT: China Coast
Bejing
9
JST: Japan Standard
Tokyo
10
GST: Guam Standard
Sydney
11
---
Magadan
12
IDLE: International Date Line East
NZST: New Zealand Standard
Wellington, New Zealand
3. 12/24 Hour Format. Press the SET key again to adjust the 12/24 hour format setting. Press
the +key to change between 12 hour and 24 hour format.
4. Change Hour. Press the SET key again to set the hour. Press the +key or MIN/MAX key to
adjust the hour up or down.
5. Change Minute. Press the SET key again to set the minute. Press the +key or MIN/MAX
key to adjust the minute.
6. Change Year. Press the SET key again to set the calendar year. Press the +key or
MIN/MAX key to adjust the calendar year.
7. Change Month. Press the SET key again to set the calendar month. Press the +key or
MIN/MAX key to adjust the calendar month.
8. Change Day. Press the SET key again to set the calendar day. Press the +key or MIN/MAX
key to adjust the calendar day.

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9. Temperature Units (Celsius or Fahrenheit). Press the +key again to toggle the temperature
units from Celsius to Fahrenheit.
10. Indoor Temperature Calibration (default is measured indoor temperature). Press the SET
key to adjust the indoor temperature. Press the +key or MIN/MAX key to adjust the
temperature up or down in 0.1 degC (0.18 degF) increments.
To view the uncalibrated value, press the ALARM key while the temperature is flashing.
Reference Section 4.2.5 Setting Calibrated Temperature for more details on this function.
11. Indoor Humidity Calibration (default is measured indoor humidity). Press the SET key to
adjust the indoor humidity. Press the +key or MIN/MAX key to adjust the relative humidity
up or down in 1% increments.
To view the uncalibrated value, press the ALARM key while the humidity is flashing.
Reference 4.2.4 Setting Calibrated Humidity for more details on this function.
12. Outdoor Temperature Calibration (default is measured outdoor temperature). Press the
SET key to adjust the outdoor temperature. Press the +key or MIN/MAX key to adjust the
temperature up or down in 0.1 degC (0.18 degF) increments.
To view the uncalibrated value, press the ALARM key while the temperature is flashing.
Reference Section 4.2.5 Setting Calibrated Temperature for more details on this feature.
13. Outdoor Humidity Calibration (default is measured outdoor humidity). Press the SET key
to adjust the outdoor humidity. Press the +key or MIN/MAX key to adjust the relative
humidity up or down in 1% increments.
To view the uncalibrated value, press the ALARM key while the humidity is flashing.
Reference 4.2.4 Setting Calibrated Humidity for more details on this function.
14. Barometric Pressure Display Units (hPa or inHg). Press the SET key again to toggle the
pressure units between hPa or inHg.
15. Relative Pressure Calibration (default is 29.92 inHg). Press the SET key to adjust the
relative barometric pressure. Press the +key or MIN/MAX key to adjust the relative
barometric pressure up or down. Reference Section 4.5.6 for more details on this function.
16. Pressure Threshold Setting (default level 2). Press the SET key again to adjust the
pressure threshold setting. Press the +key or MIN/MAX key to adjust the pressure
threshold up or down. Reference Section 4.5.4 for more details on this function.
17. Storm Threshold Setting (default level 4). Press the SET key again to adjust the storm
threshold setting. Press the +key or MIN/MAX key to adjust the storm threshold up or
down. Reference Section 4.5.5 for more details on this function.

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4.2.3 Setting Barometric Pressure
Note: This is a continuation of the previous section. To enter this mode, you must start at the
beginning of this section.
The display console displays two different pressures: absolute (measured) and relative (corrected to
sea-level).
To compare pressure conditions from one location to another, meteorologists correct pressure to
sea-level conditions. Because the air pressure decreases as you rise in altitude, the sea-level corrected
pressure (the pressure your location would be at if located at sea-level) is generally higher than your
measured pressure.
Thus, your absolute pressure may read 28.62 inHg (969 mb) at an altitude of 1000 feet (305 m), but
the relative pressure is 30.00 inHg (1016 mb).
The standard sea-level pressure is 29.92 in Hg (1013 mb). This is the average sea-level pressure
around the world. Relative pressure measurements greater than 29.92 inHg (1013 mb) are
considered high pressure and relative pressure measurements less than 29.92 inHg are considered low
pressure.
To determine the relative pressure for your location, locate an official reporting station near you (the
internet is the best source for real time barometer conditions, such as Weather.com or
Wunderground.com), and set your weather station to match the official reporting station.
To change the relative pressure in the SET mode, press the +key or MIN/MAX key to increase or
decrease the relative pressure setting to match the official reporting station.
4.2.4 Setting Calibrated Humidity
Note: This is a continuation of the previous section. To enter this mode, you must start at the
beginning of this section.
The display console allows you to calibrate both the indoor and outdoor humidity. Humidity is a
difficult parameter to measure accurately and drifts over time. The calibration feature allows you to
zero out this error. To calibrate humidity, you will need an accurate source, such as a sling
psychrometer or Humidipaks One Step Calibration kit, available from Ambient Weather, which uses a
salt bath.
To calibrate indoor humidity, in the Set Mode with indoor humidity flashing, press the +key or
MIN/MAX key to increase or decrease the humidity setting (in increments of 1%) to match the
calibrated or known humidity source. To return the indoor humidity to the measured value, press and
hold the SET key for 3 seconds and the humidity will return to the uncalibrated value.
Note: The remote (outdoor) thermo-hygrometer will always display the measured humidity level
and not the calibrated humidity level. Only the console will show the calibrated value.
Note: The dew point calculation is based on the calibrated humidity level.
4.2.5 Setting Calibrated Temperature
Temperature is measured by a resistive thermal device (RTD) and is subject to electronic variation.

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Temperature errors can also occur when a sensor is placed too close to a heat source (such as a
building structure, the ground or trees).
To calibrate the indoor or outdoor 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.
To calibrate indoor or outdoor temperature, in the Set Mode with indoor or outdoor temperature
flashing, press the +key or MIN/MAX key to increase or decrease the temperature setting (in
increments of 0.1 degC or 0.18 degF) to match the calibrated or known temperature source.
Note: The remote (outdoor) thermo-hygrometer will always display the measured temperature
level and not the calibrated temperature level. Only the console will show the calibrated value.
Note: The dew point calculation is based on the calibrated temperature level.
4.3 Alarm Mode
4.3.1 Alarm Display
While in Normal Mode, press the ALARM key to enter the High Alarm Mode. Press the ALARM
key again to enter the Low Alarm Mode. Press the ALARM key again to return to normal mode (or
wait 30 seconds for the programming mode to timeout).
Note: After entering the ALARM mode, the console will display the high and low alarm
settings. If the value reads --.-- (dashes), the alarm is not active.
4.3.2 Alarm Programming
While in Alarm Mode, press the SET key to set the alarms. The following are high and low alarms:
HighAlarm Limits:
Time alarm (hour/minute)
Indoor humidity high alarm
Indoor temperature high alarm
Outdoor humidity high alarm
Outdoor temperature / dew point high alarm
Pressure high alarm
LowAlarm Limits:
In the LowAlarm Mode press the SET key to select the following alarm modes:
Time alarm (hour/minute)
Indoor humidity low alarm
Indoor temperature low alarm

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Outdoor humidity low alarm
Outdoor temperature / dew point low alarm
Pressure low alarm
In the alarm mode, Press the +key or MIN/MAX key to change or scroll the alarm value.
Hold the +key or MIN/MAX key for 3 seconds to change the number rapidly. Press the ALARM key
to select the alarm on or off (if alarm is enabled, the speaker icon on the LCD will be turned on
indicating the alarm function has been enabled).
Press the SET key to confirm the setting and continue pressing the SET key to toggle through each
alarm mode until it returns to the normal display mode.
Press the SNOOZE key or wait 30 seconds for the programming mode to timeout, and the alarm
mode will return to the normal mode.
4.3.3 Cancelling the Alarm
When an alarm condition has been activated, the specific alarm will sound and flash for 120 seconds.
Press any key to cancel the alarm.
When an alarm condition is activated again within 10 minutes, the alarm will not sound but will
continue to flash until the weather condition is stable. This feature is useful to avoid repeated
triggering for the same alarm value.
The alarm will reset automatically once the value has fallen below the set value, or if a new value is
entered.
4.3.4 Outdoor Alarm –Temperature vs. Dew Point
When the outdoor weather alarm has been triggered, it will flash on the LCD display and the general
outdoor alarm icon and high/low alarm icon will flash. For example, in the outdoor temperature
display mode, when dew point high alarm is triggered the DEW POINT icon will flash along with
general outdoor alarm icon and high alarm icon, indicating that the current alarm source is from dew
point.
Figure 4

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4.4 Min/Max Mode
Note: The min and max settings cannot be reset at the same time. They must be reset on an
individual basis.
While in Normal Mode, press the MIN/MAX key to enter the maximum mode, and the MAX icon
and maximum records will be displayed and begin flashing.
Press MIN/MAX key again to enter the minimum mode, and the MIN icon and minimum records will
be displayed and begin flashing.
Press MIN/MAX key again to return the Normal Mode.
In the maximum (or minimum) reading Mode, press the +key to display the specific maximum (or
minimum) value you wish to reset. This value will begin flashing with the time and date time stamp at
which the maximum (or minimum) value occurred. Select the +key again to proceed to the next
parameter, in the following order:
1. Indoor humidity maximum (or minimum)
2. Indoor temperature maximum (or minimum)
3. Outdoor humidity maximum (or minimum)
4. Outdoor temperature maximum (or minimum)
5. Pressure maximum (or minimum)
Press the SET key for two seconds to reset the specific value (that is flashing) and associated date and
time to the current reading.
Press the SNOOZE key or wait 30 seconds for the programming mode to timeout, and the Min/Max
mode will return to Normal Mode.
4.5 Other Console Features
The following section describes additional console features.
4.5.1 Weather Forecasting
Note: The weather forecast or pressure tendency is based on the rate of change of barometric
pressure. In general, when the pressure increases, the weather improves (sunny to partly cloudy) and
when the pressure decreases, the weather degrades (cloudy to rain).
It may take several days to begin forecasting the weather. In the meantime, there may be no trend
arrows and the both icons display partly cloudy.
The weather forecast is an estimation or generalization of weather changes in the next 24 to 48 hours,
and varies from location to location. The tendency is simply a tool for projecting weather conditions
and is never to be relied upon as an accurate method to predict the weather.
4.5.2 Weather Forecast Initialization
When the console is powered up, the forecast prediction is in the “learning mode”. Two partly cloudy

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icons will be displayed, as shown below. When there is a change in barometric pressure over 24 to 72
hours, the forecast icons will exit the learning mode.
4.5.3 Weather Icons
Sunny
Partly Cloudy
Cloudy
Rainy
The four weather icons are Sunny, Partly Cloudy, Cloudy and Rainy. There are also two weather
tendency indicators to show the air pressure tendency between the weather icons.
4.5.4 Weather tendency indicator
The weather tendency arrow is located between the weather icons to show the air pressure tendency
and provide a forecast based on increasing or decreasing air pressure.
The arrow pointing to the right indicates that the air pressure is increasing and the weather is expected
to improve. The arrow pointing the left indicates that the air pressure is decreasing and the weather is
expected to deteriorate.
The weather tendency is based on the pressure change since last six hours. If the weather is changing,
the weather tendency indicator (animated arrows) will flash for three hours, indicating the weather is
expected to change. If the weather conditions become stable and no new weather change conditions
are met, then the arrows will be fixed.
Example 1: Pressure is decreasing, weather is deteriorating in 24-48 hours.
Example 2: Pressure is increasing, weather is improving in 24-48 hours.

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4.5.5 Storm threshold indicator
The storm threshold (the negative rate of pressure change signifying a storm is expected) can be
adjusted by the user from level 3 to level 9 (the default level 4 mbar/hour).
When negative rate of change of pressure is exceeded for 3 hours, the storm warning indicator will be
activated, and the clouds with rain icon and tendency arrows will flash for 3 hours indicating the storm
warning feature has been activated.
4.5.6 Pressure threshold setting
The pressure threshold (the negative or positive rate of change of pressure signifying a change in the
weather) can be adjusted by the user from level 2 to level 4 (default level 2 mbar/hour).
The lower the level pressure threshold setting, the higher sensitivity for weather forecast changes.
Locations that experience frequent changes in air pressure require a higher setting compared to
locations where the air pressure is typically stagnant.
4.5.7 Pressure Graph
The pressure graph displays the barometric pressure for the last 24 hours. Each bar represents three
hours. The vertical scale of the graph is auto-scaled. There is not fixed pressure level for each bar, and
is intended for visualizing trends only.
4.5.8 Restoring Lost Outdoor Temperature and Humidity Sensor
If the signal is lost between the remote sensor (or transmitter) and the display console (or the receiver),
to resynchronize, while in normal mode, press and hold the +key for 10 seconds. The transmitter
search icon will appear:
Please wait several minutes for the search icon to turn off and the remote sensor reports in. Do not
touch any buttons until synchronization is complete.
If the synchronization fails, reset the console by removing one battery from the display console, wait
10 seconds, and reinsert the battery, as specified in Section 2.4 Display Console Set Up.
5Glossary of Terms
Term
Definition
Absolute Barometric
Pressure
Relative barometric pressure, corrected to sea-level. To compare
pressure conditions from one location to another, meteorologists correct
pressure to sea-level conditions. Because the air pressure decreases as

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you rise in altitude, the sea-level corrected pressure (the pressure your
location would be at if located at sea-level) is generally higher than your
measured pressure.
Accuracy
Accuracy is defined as the ability of a measurement to match the actual
value of the quantity being measured.
HectoPascals (hPa)
Pressure units in SI (international system) units of measurement. Same
as millibars (1 hPa = 1 mbar)
Hygrometer
A hygrometer is a device that measures relative humidity. Relative
humidity is a term used to describe the amount or percentage of water
vapor that exists in air.
Inches of Mercury (inHg)
Pressure in Imperial units of measure.
1 inch of mercury = 33.86 millibars
Range
Range is defined as the amount or extent a value can be measured.
Relative Barometric
Pressure
Measured barometric pressure relative to your location or ambient
conditions.
6Specifications
6.1 Wireless Specifications
Line of sight wireless transmission (in open air): 300 feet
Frequency: 433 MHz
Update Rate: 48 seconds
6.2 Measurement Specifications
The following table provides specifications for the measured parameters.
Measurement
Range
Accuracy
Resolution
Indoor Temperature
32 to 140 °F
± 2 °F
0.1 °F
Outdoor Temperature
-40 to 149 °F
± 2 °F
0.1 °F
Indoor Humidity
1 to 99 %
± 5% (only guaranteed
between 20 to 90%)
1 %
Outdoor Humidity
1 to 99%
± 5% (only guaranteed
between 20 to 90%)
1 %
Barometric Pressure
8.85 to 32.50 inHg
± 0.08 inHg (within
range of 27.13 to 32.50
inHg)
0.01 inHg
6.3 Power Consumption
Base station : 3 x AA 1.5VAlkaline batteries
Remote sensor : 2 x AAA 1.5V Alkaline batteries
Battery life: Minimum 12 months for base station
Minimum 24 months for thermometer-hygrometer sensor (use lithium batteries in cold
weather climates)
7Troubleshooting Guide
If your question is not answered here, you can contact us as follows:

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1. Email Support: [e-mail]
2. Technical Support: 480-346-3380 (M-F 8am to 3pm Arizona Time)
Problem
Solution
Wireless remote (thermo-hygrometer) not
reporting in to console.
There are dashes (--) on the display
console.
1. Resync the unit. Press and hold the +key for
10 seconds to resynchronize. The remote sensor
search icon
will turn on. Wait several minutes for the remote
sensor to report in, or the search icon to turn off.
If the synchronization fails, reset the console by
removing one battery from the display console,
wait 10 seconds, and reinsert the battery.
Do not press any buttons while in the search
mode.
2. Check the remote sensor is powered up and
displaying the temperature and humidity on the
LCD display.
3. Install a fresh set of batteries in the remote
thermo-hygrometer. For cold weather
environments, install lithium batteries.
4. The maximum line of sight communication
range is 300’. Move the sensor assembly closer
to the display console.
5. If the sensor assembly is too close (less than
5-10’), move the sensor assembly away from the
display console.
6. Make sure the remote sensors are not
transmitting through solid metal (acts as an RF
shield), or earth barrier (down a hill).
7. Move the display console around electrical noise
generating devices, such as computers, TVs and
other wireless transmitters or receivers.
8. Move the remote sensor to a higher location.
Move the remote sensor to a closer location.
9. Radio Frequency (RF) Sensors cannot transmit
through metal barriers (example, aluminum
siding) or multiple, thick walls.
Temperature sensor reads too high in the
day time.
Make sure the thermo-hygrometer is mounted in a
shaded area on the north facing wall.
Indoor and Outdoor Temperature do not
agree
1. Allow up to one hour for the sensors to stabilize
due to signal filtering. The indoor and outdoor
temperature sensors should agree within 4 °F
(the sensor accuracy is ± 2 °F).
2. Perform a temperature calibration (reference
Section 4.2.5)
Indoor and Outdoor Humidity do not
agree
1. Allow up to one hour for the sensors to stabilize
due to signal filtering. The indoor and outdoor
humidity sensors should agree within 10 % (the

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sensor accuracy is ± 5 %)
2. Perform a humidity calibration (reference
Section 4.2.4)
Console outdoor humidity and remote
humidity do not agree.
The console displays the calibrated humidity. The remote
displays the measured humidity only. Refer to 4.2.4 to
set and reset the humidity calibration.
Relative pressure does not agree with
official reporting station
1. You may be viewing the relative pressure, not
the absolute pressure.
2. Make sure you properly calibrate the barometer
to an official local weather station (reference
Section 4.2.1)
3. The barometer is only accurate to ± 0.08 inHg
within the following relative pressure range:
27.13 to 32.50 inHg, which corresponds to an
altitude of -2,200 to 2,700 feet. At higher
altitudes, expect some non-linearity or error.
The forecast icon is not accurate
The weather station console must run for several days to
trend barometric pressure.
The weather forecast is an estimation or generalization of
weather changes in the next 24 to 48 hours, and varies
from location to location. The tendency is simply a tool
for projecting weather conditions and is never to be
relied upon as an accurate method to predict the weather.
Display console contrast is weak
Replace console batteries with a fresh set of batteries.
Console beeps and resets
Replace console batteries with a fresh set of batteries.
8Accessories
The following software and hardware accessories are available for this weather station at
www.AmbientWeather.com .
Accessory
Description
Energizer AA Lithium Battery (2-pack) -
Batteries for Long Life and Cold Climates
AA lithium batteries for cold weather climates.
Ambient Weather SRS100LX
Temperature and Humidity Solar
Radiation Shield
Solar Radiation Shield improves temperature accuracy
for hot weather climates. Remove the rain guard and
install over thermo-hygrometer.
9Product Revisions
Revision
Description
WS-1170
Initial Release
WS-1171
Added humidity calibration
WS-1171A
Added temperature calibration
Increased programming timeout from 10
seconds to 30 seconds
Changed barograph from scrolling to
non-scrolling.
Added function to reacquire lost remote
signal without powering down and up