Operation; Getting Started; 24 Hour Mold Radar Display; Comfort Level - Extech Instruments RH35 User Manual

Operation
Getting Started

Remove the protective foil from the display.

Open the battery compartment and remove the battery insulation strip. The device will
sound the alarm and all LCD segments will be displayed for two seconds as the device
switches ON.

The indoor temperature, relative humidity, and corresponding facial symbol will appear
on the display. This indicates that the meter is now ready for use.
Note: Do not attach the support stand until the switches for the Radar Animation and Alarm
Sound are set as desired. These two switches are concealed by the support stand when it is
attached. Refer to the Description section of this guide for the location of the switches and
refer to the dedicated sections below for more detail.
24 Hour Mold Radar Display
The device measures the relative humidity % every 30 seconds and calculates the average
value every 10 minutes. The innovative mold radar display graphically depicts the average on
a 24‐hour time‐line.
The time "0 h" represents the value for the current hour. "‐1" represents the last hour, "‐3"
for the past 2‐3 hours, "‐6" for the past 4‐6 hours, "‐12" for the past 7‐12 hours, and "‐24" for
the past 13‐24 hours.
The relative humidity values are shown on grid lines from 15 to 85%.
A reading higher than 65% RH indicates a potential for mold.
Radar Animation ON/OFF Switch
Remove the support stand to access the Radar Animation ON/OFF switch on the back of the
unit (the switch is on the right identified by the arrow icons). Slide the switch UP to activate
the Radar Animation. Slide the switch DOWN to deactivate the Radar Animation.
Alarm Sound ON/OFF Switch
Remove the support stand to access the Alarm Sound ON/OFF switch on the back of the unit
(the switch is on the left identified by the audio icons). Slide the switch UP to activate the
Alarm Sound beeper. Slide the switch DOWN to de‐activate the Alarm Sound beeper.
If the relative humidity measurement is higher than 65%, the alarm beeper sounds for one
minute and the red warning light (front panel, right) flashes. Press any button to stop the
alarm sound. The warning light continues flashing until the measured humidity falls below
65%.
Comfort Level
The device displays one of two facial indicators representing the comfort level of the indoor
climate. A smiling face indicates an ideal relative humidity range (40‐60%). A frowning face
indicates an overly wet or dry condition (< 40% or > 60%).
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EXTECH INSTRUMENTS
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