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RH200W-en-GB_v1.1 10/17
USER MANUAL for MODEL RH200W
Wireless Hygro-Thermometer
Thank you for selecting the Extech RH200W Wireless Hygro-Thermometer with
Self-Calibration & Auto Night Light. This device is shipped fully tested and
calibrated and, with proper use, will provide years of reliable service.
DESCRIPTIONS
MAIN UNIT
1.
Backlight key
In normal mode, short press for 5 seconds
of backlighting. Pressing other keys will reset the
5-second timer
2.
OUT (CHANNEL) / + key
In calibration mode, short press to increase the
value
In normal mode, short press to switch between
INDOOR, Channel 1~8
In normal mode, long press to enter
auto-cycle (Channel 1~8 and INDOOR
readings will alternately display at 4-
second intervals and the icon
will
display). From auto-cycle mode, short
press to return to normal mode.
3.
M (MODE) key
In calibration mode, short press for
options.
In calibration mode, long press to clear data
4.
MIN-MAX / - key
In calibration mode, short press to decrease value
In normal mode, short press to check maximum/minimum temperature and
humidity records. Short press to return to normal mode
With MAX or MIN displayed, long press to reset the displayed values
5.
CAL key
In normal mode, long press to enter calibration mode
In calibration mode, long press to return to normal mode
6.
Auto night-light switch
Slide to ON position to activate night-light (the light will automatically turn
on in dark areas). The brightness is weaker than normal backlight. Slide to
OFF position to turn off the night-light function
7.
°C / °F key
- Short press to toggle temperature units °C/°F
8.
SENSOR key
In normal mode, short press to activate the receiver for the current channel.
The unit will receive signals for 5 minutes
9.
RESET key
Short press for a factory default reset. Perform a reset if the display freezes
or the unit otherwise malfunctions.
WIRELESS SENSOR
1. Transmission status LED (flashes
when sensor is transmitting)
2. Wall mount
3. CHANNEL slide switch (assign
sensor to Channel 1 ~ 8)
4. RESET key (short press to reset
the sensor)
5. Battery compartment (2 x AA
batteries)
OPERATION
POWERING THE WIRELESS SENSOR
1. Remove the battery door of the sensor
2. Insert 2 ‘AA’ batteries, observing correct polarity
3. Close the battery door
Notes: Once a sensor is assigned a channel using the channel slide switch, you
can only re-assign a channel by removing the batteries or resetting the unit.
Avoid placing the sensor in direct sunlight or inclement weather.
POWERING THE MAIN UNIT
1. Remove the battery door of the main unit
2. Install 4 ‘AA’ batteries observing correct polarity; then use a paper clip to
press the RESET key
3. Close the battery door
4. All LCD segments will switch on
Note: To avoid a pairing failure, power up the sensor first, and then press the
RESET key on the main unit only.
INDOOR TEMPERATURE/RELATIVE HUMIDITY
1. Short press OUT until ‘IN” is displayed. The unit is now displaying indoor
temperature °C / °F and Relative Humidity %.
2. Short press °C / °F to switch between °C and °F
3. When the temperature is <-40°F/°C or > 158°F (70°C), Lo or HI will be
displayed respectively. The humidity display will show dashes:
4. When the humidity is < 1% or > 99%, Lo or HI will be displayed:
COMFORT INDICATION
The comfort indication feature is an icon-based system showing comfort level
based on indoor air temperature and humidity ranging from Excessive Cold (left
icon below) to Comfortable (center icon) to Excessive Heat (right icon).
Note: Comfort indication can vary even when measuring the same
temperature because of the strong effect humidity has on comfort. There is no
comfort indication when temperature is < 0°C (32°F) or > 60°C (140°F).
TEMPERATURE AND HUMIDITY TRENDING ARROWS
The temperature and humidity trend indicator illustrates the temperature and
humidity change over time. Arrows indicate rising (left icon shown below),
steady (center icon), or falling temperatures (right icon).
MAX/MIN RECORDING
View the MAX/MIN temperature and humidity readings since the last reset.
1. In normal mode, short press MIN-MAX to show the current maximum
temperature and humidity values (diagram on left below); press again to
show the minimum values (diagram in center); press again to exit the mode
(the unit automatically exits the mode after approximately 5 seconds).
2. Perform a manual reset (clear MAX/MIN readings) by long pressing MIN-
MAX when the unit is displaying the MAX/MIN records (diagram on right).
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
