B+B A307 User manual
INSTRUCTION MANUAL
Technical changes reserved
B+B 0141 0315-02 September 2011
Description
Digital thermometer A307
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
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INSTRUCTION MANUAL
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B+B 0141 0315-02 September 2011
Introduction
This instrument is a portable, compact-sized digital thermometer designed to use external NiCr-Ni K-type thermo-
couples as temperature sensor according to DIN/IEC.
Safety information
It is recommended that you read the safety and operation instructions before using the thermometer.
Warning
To avoid electrical shock, do not use this instrument when voltages at the measurement surface exceed 24 V AC or
60 V AC.
To avoid damage or burns, do not make temperature measurements in microwave ovens.
Caution
Repeated sharp exing can break the thermocouple leads. To prolong lead life, avoid sharp bends in the leads, espe-
cially near the connector.
The -symbol on the instrument indicates, that the operator must refer to an explanation in this manual.
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INSTRUCTION MANUAL
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Technical data
Digital thermometer A307
Temperature Scale Celsius or Fahrenheit user-selectable
Measuring range -50…+1300 °C (-58...+2000 °F)
Resolution 1 °C or 1 °F, 0,1 °C er 0,1 °F
Accuracy Accuracy is specied for operating temperatures over the range of 18
°C to 28 °C (64 to 82 °F), for 1 year, not inclusing thermocouple error
±(0,3% rdg +1°C) -50…+1000 °C
±(035% rdg +1 °C) +1000…+1300 °C
±(03% rdg +2 °F) -58…+2000 °F
Input protection 60 V DC or 24 V rms AC maximum input voltage on any combination
of input pins
Reading rate 2,5 times per second
Input connector Accepts standart miniature thermocouple connectors (at blades
spaced 7.9 mm, center to center)
Ambient operating range 0…+50 °C (+32...+122 °F)
Storage temperature -20…+60 °C (-4...+140 °F)
Relative humidity 0...80% (0…35 °C) (32...95 °F)
0…70% (35…50 °C) (95...122 °F)
Display 3½-digit liquid crystal display (LCD) with maximum readiung of 1999
Battery Standart 9V battery (NEDA 1604, IEC 6F22)
Battery life 200 hours typical with carbon zinc battery
Dimensions 147 mm x 70 mm x39 mm (HxWxD)
Weight 7.4 oz (210 g)
Battery replacement
Power is supplied by a 9 volt „transistor“ battery (NEDA 1604, IEC 6F22). The battery-symbol appears on the LCD
display when replacmenet is needed. To replace the battery, remove the three screws from the back of the thermo-
meter and lift off the front case. Remove the battery from case bottom.
Warning:To avoid possible electrical shock, disconect the thermocouple connectors from the thermometer before
removing the cover.
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INSTRUCTION MANUAL
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B+B 0141 0315-02 September 2011
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.
Measuring the difference
You can retrieve temperature values by pressing the T1 or T2 keys.
When you press the „T1-T2“ key the difference between the two measuring channels is displayed.
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
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INSTRUCTION MANUAL
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B+B 0141 0315-02 September 2011
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 environ-
ment. Leave sufcient 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.
Resetting the OFFSET Control
To return the OFFSET control to their factory setting without having to recalibrate the thermometer, perform the
following procedure:
1. Connect a thermocouple that is in good working order to the input that is to be adjusted.
2. Place the thermocouple in an ice-water bath and allow the reading to stabilize.
3. Slowly adjust the OFFSET control until the thermometer reads 0°C (32°F)
Questions
If you have further questions, that cannot be solved with this manual, please contact:
B+B Thermo-Technik GmbH
Heinrich-Hertz-Straße 4
D-78166 Donaueschingen
Tel.: +49 (0) 771 83160
Fax: +49 (0) 771 831650
E-Mail: [email protected]
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