testo 205 One Handed Ph/°C Measuring Device Instruction Manual

testo 205 One Handed Ph/°C Measuring Device

Product Information

This product is a measurement device with display and control elements. It is powered by batteries and can be used for various purposes.

Anzeige- und Bedienelemente

• Display: Shows the measured values and other information.
• ON/HOLD: Button for turning on/off the device and holding the measured values.
• MODE: Button for changing the function/mode of the device.
• CAL: Button for accessing the calibration mode.
• Batteriefach: Compartment for inserting batteries.

Spannungsversorgung

The device is powered by 4 LR44 batteries. To insert the batteries, follow these steps:

1. Pull out the battery compartment.
2. Insert the batteries with the correct polarity.
3. Push back the battery compartment.
4. Remove the protective strip from the top of the storage cap.

Product Usage Instructions

Ein- / Ausschalten

To turn on/off the device, follow these steps:

1. Press the ON/HOLD button to turn on/off the device.

Messen

To measure pH and temperature, follow these steps:

1. Dip/insert the probe into the medium to be measured.
2. The measured pH and temperature values will be displayed.
3. The values are updated twice per second.
4. To manually hold the measurement, press the ON/HOLD button. To start the measurement again, press the ON/HOLD button.

Wartung und Pflege

To clean the probe, use the specified cleaning agents.

Sonde wechseln

1. Pull out the battery compartment.
2. Remove the empty batteries and insert new LR44 batteries with the correct polarity.
3. Push back the battery compartment.

For more information and troubleshooting, refer to the user manual.

General Information

Please read this document through carefully and familiarise yourself with the operation of the product before putting it to use.
Keep this documentation to hand so that you can refer to it when necessary.
Symbols and what they mean

Safety Information

Avoid electrical hazards:
Do not measure on or near live parts!
Preserving product safety / warranty claims:

• Operate the instrument properly and according to its intended purpose and within the parameters specified. Do not use force.
• Do not store together with solvents (e.g. acetone).
• Temperature data on probes / sensors refer only to the measurement area of the sensors. Do not expose handles and cables to temperatures greater than 70°C if they are not specifically designed for higher temperatures.
• Open the instrument only when this is expressly described in the documentation for maintenance purposes.
• Only the maintenance and service work described in the documentation should be carried out. Please adhere to the steps specified. For safety reasons, only original spare parts from
• Testo should be used.

Ensure correct disposal:

• Disposal of defective rechargeable batteries and spent batteries at the collection points provided.
• Send the instrument directly to us at the end of its life cycle.
• We will ensure that it is disposed of in an environmentally friendly manner.

Intended Purpose

Its appliclation areas include the measurement of semi-solid substances in the food production and processing sector: abattoirs, cutting plants, Incoming goods checks during transport, cheese production and in bakeries. testo 205 is not suitable for diagnostic measurements in themedical sector.

testo 205 is a practical instrument for measuring pH value and temperature.
The following components of the product are designed for continuous contact with foodstuffs in accordance with the regulation (EC) 1935/2004:
The measurement probe up to 1 cm before the probe handle or the plastic housing. If provided, the information about penetration depths in the instruction manual or the mark(s) on the measurement probes should be noted.

Product Description

Display and control elements

Power
Power is via four button cells (Type LR44, included with delivery).

Storage cap
The storage cap filled with electrolyte gel is used to store the probe between measurements. The probe is only immediately ready to operate if stored in electrolyte gel.
If the probe has been out of the electrolyte gel for a longer period of time, it must be stored in the electrolyte gel for approx. 12 hours to regenerate.
The storage cap can also be attached to the wall/transport bracket.

wall/Transport bracket
The wall/transport bracket with belt holder and attachment unit for the storage cap is used for the safe storage of the measurement instrument at a fixed point or during transport.

Initial Operation

Insert battery

1. Remove battery compartment.
2. insert batteries (4 x Type LR44). Watch out for +/-!
3. push battery compartment back in.
4. Remove protection strip on the storage cap.

Operation

Switching on/off

• Switch on instrument: ON/HOLD .
  All segments light up briefly and the instrument changes to the measurement mode.

• Switch off instrument: Keep ON/HOLD pressed.

Setting instrument
The following functions can be set:

* Modification less than 0.02pH in 20s
The setting procedure can be interrupted by switching off the instrument. The modifications are then not saved.
The instrument is switched off.

1. Opening the setting mode: MODE is kept pressed + ON/HOLD.

2. Select temperature unit (°C or °F): CAL .
   Confirm selection: MODE .

3. Switch Hold on (On) or off (OFF): CAL .
   Confirm selection: MODE .
   The gradient and offset values stored in the instrument are displayed as information.

4. Change view: MODE .

5. Select calibration method (1P, 2P or 3P): CAL .
   Confirm selection: MODE .
   If 1 or 2 point calibration has been set:
   Select calibration points (4, 7 or 10, and 4 7 or 7 10): CAL .
   Confirm selection: MODE .

6. Switch Auto Off on (On) or off (OFF): CAL .
   Confirm selection: MODE .

7. Display light on (On) or off (OFF): CAL .
   Confirm selection: MODE .

8. Switch beeper on (On) or off (OFF): CAL .
   Confirm selection and save settings: MODE .
   All of the segments light up briefly and the instrument changes to the measurement mode.

Measuring

Setting up the instrument
If large quantities of the electrolyte gel are stuck to the probe when removed from the storage cap, it is a sign that the gel is spent.

• A new storage cap is needed.
• Clean off the pH probe before and after each measurement with low concentration soap water followed by tap water (water temperature should be below 40 °C). Dab dry with a paper towel. Do not rub.
  After horizontal storage:
  Briefly shake the probe in order to release any gas bubbles which may have formed in the probe tip.

1. Carefully remove storage cap.
2. Switch on instrument: ON/HOLD .

Carry out measurement
Measurement tip made of glass, risk of breakage!
Risk of injury on account of glass parts which remain in the measurement medium.

• Check measurement tip of pH probe after each measurement for damage.
•  Immerse/penetrate probe in the medium to be measured.
• The measured pH and temperature values are displayed. The readings are updated twice a second.
  • Hold readings manually: ON/HOLD .
  • Restart measurement: ON/HOLD .
• If Auto-Hold is switched on, AUTO HOLD flashes until the instrument has found a stable pH reading. The readings are then frozen (AUTO HOLD lights up). If no stable pH readings have been found within 300s, the measurement is stopped ( and AUTO HOLD light up).
  Restart measurement: ON/HOLD .

Finish measurement

1. Switch off instrument: Keep ON/HOLD pressed.
2. Clean off the pH probe with low concentration soap water followed by tap water (water temperature should be below 40 °C). Dab dry with a paper towel. Do not rub.
3. Insert probe in the storage cap filled with electrolyte gel.
   The probe tip must be immersed in the electrolyte gel. Keep electrolyte gel clean.

Calibrating instrument
Please also adhere to the instructions supplied with the buffer solution (Testo buffer: see label).
During calibration it is important, that the glass probe does not touch the synthetic material of the bottle. Preferably do not leave the instrument in the bottle, as variations in calibrations of up to ± 0.4 pH can arise.
The instrument is switched on and is in the measurement mode.

1. Open calibration mode: CAL .

   • Calibration point (4, 7 or 10) is shown and CAL flashes.

2. Skip calibration point: MODE .

   • orImmerse probe in the buffer solution and start calibration: CAL .

   • The instrument waites for a stable reading: AUTO flashes.

   • If a stable reading is available (change less than 0.02pH in 20s), the calibration point calibrates and the instrument changes to the next calibration point (if available) or to the gradient and offset value display.
     Carry out calibration manually: CAL .
     Repeat Step 2 for additional calibration points.

   • Once calibration is complete, the amount of the gradient and offset value is shown. If the amount of the gradient value is less than 50mV / pH or the amount of the offset value is greater than 60mV, the pH electrode is spent and must be replaced.

3. Return to measurement view: CAL .

Service and Maintenance

Checking electrolyte gel
Check the electrolyte gel in the storage cap regularly for contamination and ensure it is filled to the correct level. Replace storage cap if necessary.
Cleaning housing
Clean housing with a damp cloth (soap water) if dirty. Do not use abrasive cleaning agents or solutions!
Cleaning probe
Destruction of probe due to incorrect cleaning!
Danger of injury due to glass parts remaining in the measurement medium.
Use only the cleaning substances stated.
Depending on the type of contamination, the following cleaning substances are suitable:

• Fat: domestic dishwashing liquid
• Protein: pepsin

The use of warm water improves the cleaning effect.

1. Apply dishwashing liquid or pepsin to a cloth and gently wipe (do not rub, as this leads to static charging).
2.  Rinse the probe with clear warm water.
3. To stabilize the probe, place in the storage solution for at least 1 hour (better 12 hours)..
4. Re-calibrate the probe (see 5.4 Calibrating instrument, page 24).

Changing the probe
The instrument must be newly calibrated once a probe has been changed (See 5.4 Calibrating instrument, page 24)!
Instrument must be switched off. Plug contacts in the instrument should not be touched!

1. Turn screw ring anti-clockwise and remove probe.
2. Attach new probe (watch for guide groove) and tighten screw ring in a clockwise direction.

Changing battery

1. Pull out battery compartment.
2. Remove spent batteries and insert new batteries (4 x Type LR44). Watch out for +/-.
3. Reinsert battery compartment.

Questions and Answers

If we have not answered your question, please contact your nearest distributor or Testo Customer Service point. For contact data, see back of this document or web page www.testo.com/service-contact

TECHNICAL DATA

Accessories and Spare Parts

9. Accessories and Spare Parts|
---|---
Name| Item no.
Replacement pH probe for testo 205 including gel storage cap| 0650 2051
Storage cap for testo 205 with KCI gel filling| 0554 2051
Button cells 1.5 V (4 pcs.), battery type LR44| 0515 0032
pH buffer solution 4.01 in dosing bottle (250 ml), including DAkkS calibration certificate|

0554 2061

pH buffer solution 7.00 in dosing bottle (250 ml), including DAkkS calibration certificate|

0554 2063

ISO calibration certificate analysis for pH buffer solutions; calibration points 4 pH, 7 pH, 10 pH|

0520 0007

ISO calibration certificate analysis at 3 pH values over the measuring range| 0520 0037

testo SE & Co. KGaA
Postfach 11 40, 79849 Lenzkirch
Telefon: (0 76 53) 6 81 – 0
Fax: (0 76 53) 6 81 – 1 00
E-Mail: info@testo.de
Internet: http://www.testo.com

References

• testo.com/service-contact
• Guarantee |

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