OPERATION MANUAL
Technical changes reserved
0141 0315-02 20.04.2016
Digital thermometer A305
Operating instructions
Selecting the Temperature Scale
Readings are displayes in either degrees Celsius(°C) or degrees Fahrenheit (°F). When the thermometer is turned
on, it is set to the temperature scale that was in use when the thermometer was last turned off. To change the tempe-
rature scale, press the °C or °F key.
Selecting the Display Resolution
The thermometer allows two choices of resolution:
High resolution: 0.1 °C or 0.1 °F
Low resolution: 1.0 °C or 1.0 °F
To select the alternate display resolution, press the corresponding „1°“ or „0.1°“ key.
Overload display (OL)
The digital display will indicate OL when the input exceeds the mesaurement range selected. If measuring above
199.9°, change the resolution to 1°. Be certain to seat the thermocouple connector properly and that the leads are
not broken.
HOLD mode
Pressing the HOLD key to enter the DataHold mode, the „D-H“ annunciator is displayed. When HOLD mode is selec-
ted, the thermometer held the present readings and stops all further measurements.
Pressing the HOLD key again cancels HOLD mode, causing the thermometer to resume taking measurements.
MAX mode
Pressing the MAX key to enter the MAX mode. The thermometer then records and updates the maximum values and
the MAX annunciator appears on the display. Pressing the MAX key again to exit the MAX recording mode.
In the MAX mode, press HOLD key to stop recording, press HOLD again to resume recording.
Offset adjustment
The OFFSET controls are set at the factory to allow for the variations found in standart thermocouples. By adjusting
the OFFSET controls, you can optimize measurement accuracy for a particular thermocouple at a particular tempera-
ture.
Adjusting for Accurate Measurements
1. Connect the thermocouple to the input connector and turn the thermometer ON, then press the 0.1° key to select
the high display resolution.
2. Playe the thermocouple in a known, stable temperature environment at or near the temperature you wish to mea-
sure, and allow the readings to stabilize.
3. Slowly adjust the OFFSET control so that the thermometer reading matches the temperature of the known envi-
ronment. Leave sufficient time between adjustments to allow for meassurment lag.
4. The calibration of the thermometer-thermocouple combination is now optimized for measurements near the tempe-
rature measured in step 2.
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
Fon +49 771 83160 | Fax +49 771 831650 | [email protected] | bb-sensors.com
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