Sper scientific 850045 Bedienungsanleitung

Dissolved Oxygen Pen

Meter

850045

Instruction Manual

TABLE OF CONTENTS

Features …………………………………...…...……...

Front Panel Description ……………………………… 4

Measurement Procedures ………………………..…. 7-9

Probe Maintenance …………………….……………

10-11

Specifications ……..………………………….………. 12-13

Battery Replacement ………………………...….…... 14

Calibration …………………………………………….. 5-6

 Heavy duty polarographic D.O. probe including

temperature sensor

 Automatic Temperature Compensation

 Microprocessor assures high accuracy

 Dual display LCD

 Auto power off

 IP-67 water resistance.

 Maximum and Minimum

 Data hold

FEATURES

FRONT PANEL DESCRIPTION

FIGURE 1

1-6

1-1

1-7

1-5

1-2

1-3

1-4

1-1

1-2

1-3

1-4

1-5

1-6

1-7

CALIBRATION

Calibration

1. Fill the D.O. meter probe head (completely) with

Electrolyte prior to using the first time. Please refer to

the Probe Maintenance section (page 10) for

instructions.

2. Prior to taking measurements, the D.O. meter should be

calibrated using the following steps.

3. Remove the red protective cover (Fig., 1-7) from the

black probe head (Fig., 1-5). *The small sponge inside

the red cover keeps the diaphragm moist with water.

4. To turn the meter on, press the Power On/Off button

(Fig., 1-2).

5. The LCD display (Fig., 1-1) will show %O2and

Temperature - see example below.

Wait for approximately three (3) minutes until the upper

display value stabilizes.

21.5

25.9 ºC

Perform the calibration procedure in an open and well

ventilated area to achieve the best possible results. Once

the calibration is complete the meter should read approx.

20.9 as this is the typical amount of O2 in the air.

CALIBRATION

CAL

Flashing

Counts down

from 30 to 0

6. Press and release the HOLD button (Fig., 1-3) - the

display will read HOLD.

7. Press and release the REC button (Fig., 1-4) - the

display will show a flashing CAL indicator and the upper

value will change to 30, then countdown to 0 (takes 30

seconds).

8. Once the countdown has been completed, the End

indicator will be displayed momentarily, then display will

return to the normal display as shown on page 3.

MEASUREMENT PROCEDURES

Dissolved Oxygen (DO) Measurement

1. Make certain the meter has been calibrated (page 5).

2. Press and hold the Unit button (Fig., 1-3) for at least 2

seconds, the display will change from %O2to mg/L.

3. The meter is now ready to measure.

4. To activate Automatic Temperature Compensation the

probe head (Fig., 1-5) must be immersed to a depth of

10cm. It takes several minutes for the temperature of

the probe and liquid to equalize.

5. For accurate D.O. measurement of any liquid, the probe

should be moving. Make sure that the velocity of the

movement is at least 0.2 - 0.3 m/s. This can be achieved

by shaking the probe.

Note...

To keep errors to a minimum during laboratory

measurements, use of a magnetic agitator is

recommended.

6. Rinse the probe with tap water after each measurement.

7. Re-install the probe head’s protector cover (Fig., 1-7).

MEASUREMENT PROCEDURES

Temperature Measurement

1. When not in calibration mode, the meter continually

displays the temperature at the bottom left hand corner

of the LCD in either ºC or ºF.

2. Press and hold the REC button (Fig., 1-4) for at least 2

seconds to switch the temperature unit from ºC to ºF.

Note...

The temperature unit cannot be changed when the meter is

in record mode (when the REC indicator is displayed on the

LCD).

Data Hold

1. While measuring, press the Hold button (Fig., 1-3) to

hold the displayed value. The LCD will show the HOLD

symbol.

2. Press the Hold button once again to release the data

hold function.

Data Record (Maximum & Minimum Reading)

1. The data record function records the maximum and min-

imum readings. Press the REC button (Fig., 1-4) to start

the Data Record function - the display shows REC.

2. Press the REC button: the REC MAX symbol, along with

the maximum value shows on the display.

3. Press the REC button again and the REC MIN symbol,

along with the minimum value shows on the display.

4. To exit the record function, press and hold the REC

button for a minimum of 2 seconds. The display will

return to the current reading.

MEASUREMENT PROCEDURES

PROBE MAINTENANCE

Initial Use

1. Unpack the DO meter and fill the probe head with the

Electrolyte (OXEL-03) fluid provided.

2. Follow the steps shown in Figure 2.

Probe Head & Fluid Maintenance

1. Whenever the DO meter will not calibrate correctly or

the DO reading is unstable, check to see if the

Electrolyte fluid is dirty or has evaporated.

2. If the Electrolyte fluid needs to be replaced, refill the

probe head (completely), following the steps shown in

Figure 2 and recalibrate the DO meter (see page 3)

3. If the fluid has been replaced and the DO meter still

does not calibrate correctly or give a stable reading,

check the probe head diaphragm for damage.

4. The Teflon diaphragm is delicate and can be damaged if

it comes in contact with solid objects or if the meter is

dropped.

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