Sartorius PT-10 Bedienungsanleitung

WPT5005-e02081

Service Manuals

Sartorius Troubleshooting

PT-10, PT-10P

Portable pH/mV-Meter

Contents

03 Service Policy for Exchanging Portable pH/mV

Meters (PT-10)

03 Troubleshooting PT-10

03 Testing the UP-10 Meter

04 Testing the pH Electrode

05 Quick Calibration

05 Complete Calibration

06 Changing Keypad

09 Changing Display

12 Changing Main PCB

17 Changing Battery Connector

Service Policy for Exchanging Portable pH/mV Meters (PT-10)

- Defective meters shall be exchanged for new ones and will be sent to our

central repair workshop (ZW) in Goettingen, Germany, for reworking.

- At your special request, meters can be sent to ZW in Goettingen for repair.

- Our warranty terms and conditions shall apply to all requests for repair.

Troubleshooting PT-10

Testing the UP-10 Meter

•Place meter in mV mode

•Press setup and then enter

This will clear out any offset that might be plugged into the meter

•Place the shorting cap on the BNC

•The reading should be stable at 0 ± 0.1 mV plus long term drift (0.1 mV per

month)

•Outside of this range

may

indicate a bad meter. Go to calibration section of

service manual.

•If meter passes this test, the meter is good. Go to electrode test below.

Testing the pH ElectrodeTesting the pH Electrode

Testing the pH Electrode

•Connect the pH electrode to the BNC connector

•Place the clean electrode into a pH 7 buffer

•Place in mV mode: reading should be 0 ± 30 mV

Outside of this range indicates a

bad

electrode

•Place the clean electrode into a pH 4 buffer

•Press mV: reading should be 159 to 186 mV more than value in pH 7

Example:

pH 7 buffer reads 10 mV; therefore,

the 4 buffer should read between 169 to 196 mV

•Place the clean electrode into a 10 buffer

•Press mV: reading should be 159 to 186 mV less than pH 7

Example:

pH 7 buffer reads 10 mV; therefore,

the 10 buffer should read between -149 to -176 mV

•If electrode passes this test, confirm that the correct buffer set is selected. Then

clear buffers and re-standardize.

•If electrode fails this test, refer to electrode instructions on reconditioning

electrode.

Quick Calibration

1. Place the shorting cap on the BNC connector.

2. Press the mode and enter keys simultaneously.

3. The instrument will display „CAL“ on the screen. When the countdown is

finished the meter is calibrated.

4. If the reading is now 0 +/- 0.1 mV (7.00 pH) calibration was successful. If the

reading is outside of this range or unstable, replace the main PCB board.

Complete Calibration

NOTE:NOTE:

NOTE: Only perform this calibration sequence if you have a calibrated precision voltage

source with an accuracy better than 0.1 mV and a 10 kohm resistor.

1. Press the mode and enter keys simultaneously.

2. Input 0.0 mV and wait for the countdown to be completed.

3. Input 1999.0 mV and wait for the countdown to be completed.

4. Input –1999.0 mV and wait for the countdown to be completed.

5. Input 0.0 mV and wait for the countdown to be completed.

6. Place the 10 kohm resistor in the ATC plug and wait for the countdown to be

completed.

All the segments on the display will light up. Press enter to continue.

Changing Keypad

NOTE: Do not service with power to the instrument!

1. Remove the battery cover.

2. Using a Phillips screwdriver, remove the two screws in the battery compartment

and the two screws near the strap opening.

3. Lift the zif socket labeled „Keypad“ and remove the keypad cable.

4. Remove the keypad overlay and membrane switch from the cover.

Keypad zif & cable

PT_001.JPG

PT_002.JPG

screws

Keypad zif &cable

5. Place the new keypad membranes on the cover (outline first followed by the

keypad), feeding the cable through the slot.

6. Place the cable back into the appropriate zif socket.

7. Place the overlay on top of the membrane keypad.

8. Before sealing, plug in and confirm display and keypad are working.

PT_003.JPG

PT_004.JPG

9. Place silicon drops in four places (both top corners and the bend on both sides).

10.Place the cover on the base.

11.Replace all four screws.

PT_002.JPG

Changing Display

NOTE: Do not service with power to the instrument!

1. Remove the Battery Cover.

2. Using a Phillips screwdriver, remove the two screws in the battery compartment

and the two screws near the strap opening

3. Lift the zif socket labeled „Keypad“ and remove the keypad cable.

4. Lift the zif socket labeled „Display“ and remove the display cable.

PT_001.JPG

PT_002.JPG

screws

Disply zif &cable

Keybad zif and cable

5. Remove the two screws and washers holding the display with PCB on the cover.

6. Clean, and make dust free, the display and the cover.

7. Reassemble by following steps 3-5 in reverse order.

PT_005.JPG

screws

PT_006.JPG

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