B+B A307 Instruction Manual

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INSTRUCTION MANUAL

Technical changes reserved B+B 0141 0315-02 September 2011

Description

Digital thermometer A307

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INSTRUCTION MANUAL

Technical changes reserved 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 thermocouples 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, especially near the connector.

The -symbol on the instrument indicates, that the operator must refer to an explanation in this 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 specied 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 thermometer 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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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 temperature 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 selected, 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.

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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 temperature.

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 measure, 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 sufcient time between adjustments to allow for meassurment lag.

4. The calibration of the thermometer-thermocouple combination is now optimized for measurements near the temperature 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: info@bb-sensors.com bb-sensors.com

Your Temperature partner

B+B Thermo-Technik GmbH

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