OPERATION MANUAL
Technical changes reserved
0141 0316-127 20.04.2016
HM309 portable measuring device
Instructions for use
Starting the device for the first time
Caution! Connect the sensor when the device is shut off. First shut the device off if you intend to change the measurement sensor.
Plugging in during operation can damage the sensor or the device!
The device is delivered calibrated and ready to operate. To start the measuring device for the first time, first use a screwdriver to
open the battery compartment on the back of the device and insert the battery.
Then connect the sensor’s connection cable to the appropriate socket on the front of the device. The arrow shown on the plug or the
flat side of the plug must point downward.
Prevent static charges and do not touch the electrical contacts. Electrostatic charges can damage the device or the sensor!
Turn the device on with the ON button. The current humidity and temperature values are shown on the display.
Setting up the display
In normal mode, the two-line LCD display of the controls is for showing the currently measured temperature and humidity values.
Operation in normal mode
Display
Relative humidity as a percent
Temperature in °C
Operating the HM 309 portable measuring device
Key functions
The keys have the following basic functions:
Function
Description
Turning the device on and off
Value on the display remains stable
Switching between °C and °F
Display of dew point and absolute humidity
Display of minimum and maximum values determined
Reset the minimum and maximum values
B+B Thermo-Technik GmbH | Heinrich-Hertz-Str. 4 | D-78166 Donaueschingen
Fon +49 771 83160 | Fax +49 771 831650 | [email protected] | bb-sensors.com
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