Sartorius PT-10 User manual

WPT5005-e02081
Service Manuals
Sartorius Troubleshooting
PT-10, PT-10P
Portable pH/mV-Meter

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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

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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.

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Testing the pH ElectrodeTesting the pH Electrode
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.

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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: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.

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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

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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

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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

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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

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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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8. Before sealing, plug in and confirm display and keypad are working.
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_007.JPG
PT_002.JPG

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Changing Main PCB
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.
5. Remove the battery connector.
PT_001.JPG
screws
PT_002.JPG
Display zif &cable
Battery connector
Keypad zif &cable

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6. Remove the main PCB by gently holding back tabs and snapping board out (will
be held by silicon on ATC port).
7. Remove tape and clean surface of base.
8. Place two pieces of double-sided tape on either side of the indentation taking
care that they do not touch the indentation.
PT_008.JPG
PT_009.JPG

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PT_010.JPG
PT_011.JPG
9. Place silicon on all three sides of the bottom of the ATC cover.
10.Place the ATC cover onto the main PCB board around the ATC connector.
11.Place silicon around the front of the ATC connector filling the gap between the
connector and ATC cover,
12.Place the O-ring on the ATC connector.

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13.Place the large O-ring around the BNC connector.
14.Gently hold back the tabs and insert the board into place.
15.Using silicon completely fill the empty space behind the BNC connector.
PT_008.JPG
PT_012.JPG

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16.Reattach the battery connector, display cable and keypad cable to the main
PCB.
17.Apply power to the instrument and confirm operation.
18.Place silicon drops in four places (both top corners and the bend on both sides).
19.Place the cover on the base.
20.Replace all four screws.
PT_002.JPG
PT_002.JPG

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Changing Battery Connector
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. Remove the battery connector from the main PCB.
4. Remove the battery cable from the base.
PT_001.JPG
PT_002.JPG
screws
Battery connector

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5. Thread the new connector in from the battery compartment to the inside of the
instrument.
6. Tie a knot in the cable near the base and pull tight.
7. Place Black Max (Loctite 380) around the knot being sure it does not pass
though the hole into the battery compartment.
8. Place Accelerator (Locktite 7452) over Black Max.
PT_013.JPG
PT_014.JPG

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9. Put the connector onto the battery cable.
10.Reattach connector to main PCB.
11.Put in battery and confirm operation before sealing.
12.Place silicon drops in four places (both top corners and the bend on both sides).
13.Place the cover on the base.
14.Replace all four screws.
PT_015.JPG
PT_002.JPG

Sartorius AG
Weender Landstrasse 94–108
37075 Goettingen, Germany
Hotline +49.551.308-4440
Fax +49.551.308-4449
www.sartorius.com
e-mail: [email protected]
Copyright by Sartorius AG, Goettingen, Germany.
All rights reserved. No part of this publication
may be reprinted or translated in any form or by
any means without the prior written permission
of Sartorius AG.
The status of the information, specifications and
illustrations in this manual is indicated by the date
given below. Sartorius AG reserves the right to
make changes to the technology, features,
specifications, and design of the equipment
without notice.
Status: August 2002, Sartorius AG, Goettingen, Germany
Printed in Germany on paper that has been
bleached without any use of chlorine · W1A000 · I.K.
Publication No.:WPT5005-e02081