1. Einleitung
The Testo 205 is a robust handheld pH and temperature measuring instrument designed for use in semi-solid media. It is particularly suitable for applications in food production, such as monitoring the quality and maturation of meat in butcher shops, slaughterhouses, and the meat-processing industry. This manual provides essential information for the proper setup, operation, and maintenance of your Testo 205 device.
Figure 1: The Testo 205 Handheld T-bar pH Meter, showing its display and controls.
2. Hauptmerkmale
- Simultaneous measurement of pH value and temperature in semi-solid media.
- Integrated temperature sensor for automatic temperature compensation, ensuring accurate pH readings.
- Maintenance-free pH probe with gel electrolyte, designed to be leak-proof and resistant to dirt.
- Hole diaphragm on the pH probe for quick and reliable measurements.
- User-replaceable combined pH measuring tip and temperature probe.
- Two-line, illuminated LCD display showing both pH and temperature readings.
- Automatic final value recognition (auto-hold function) with an audible advisory tone when readings stabilize.
- Storage cap filled with gel electrolyte to maintain probe hydration and extend its lifespan.
- Includes a belt/wall bracket for secure storage.
- Supports one, two, or three-point calibration.
3. Einrichtung und Erstgebrauch
3.1. Einlegen der Batterie
The Testo 205 uses 4 x LR44 button cell batteries. To install or replace batteries:
- Suchen Sie die Abdeckung des Batteriefachs auf der Rückseite des Geräts.
- Open the cover using a suitable tool (e.g., a small screwdriver or coin).
- Insert the 4 LR44 button cell batteries, ensuring correct polarity.
- Schließen Sie den Batteriefachdeckel fest.
3.2. Preparing the pH Probe
Before first use, or after prolonged storage, ensure the pH probe is properly conditioned.
- Remove the storage cap from the pH probe. The cap contains gel electrolyte to keep the probe hydrated.
- Rinse the probe tip with distilled water.
- Proceed with calibration as described in Section 4.1.
4. Bedienungsanleitung
4.1. Kalibrierung
Regular calibration is crucial for accurate pH measurements. The Testo 205 supports one, two, or three-point calibration using buffer solutions.
- Drücken Sie die IN DER WARTESCHLEIFE Taste, um das Gerät einzuschalten.
- Drücken Sie die CAL Taste zum Aktivieren des Kalibrierungsmodus.
- Immerse the pH probe into the first calibration buffer solution (e.g., pH 7.00). Ensure the probe tip is fully submerged.
- The device will automatically detect the buffer and begin calibration. Wait for the reading to stabilize and the device to confirm calibration (e.g., by displaying "CAL OK" or a stable value).
- Spülen Sie die Sonde mit destilliertem Wasser.
- For two or three-point calibration, repeat steps 3-5 with additional buffer solutions (e.g., pH 4.01 and pH 10.01).
- Exit calibration mode by pressing the CAL button again or waiting for automatic exit.
Notiz: For economical use of calibration solution, Testo offers calibration dosing bottles with integrated dosing apertures.
4.2. Durchführen einer Messung
To measure pH and temperature in semi-solid media:
- Ensure the device is calibrated and the probe is clean.
- Drücken Sie die IN DER WARTESCHLEIFE Taste, um das Gerät einzuschalten.
- Carefully insert the pH probe into the semi-solid medium (e.g., meat). Ensure good contact and sufficient depth for accurate readings.
- The illuminated display will show both the pH value and temperature simultaneously.
- The automatic final value recognition (auto-hold) will capture the reading once it stabilizes. An advisory tone will sound to indicate stability.
- To manually hold a reading, press the IN DER WARTESCHLEIFE button during measurement. Press again to release.
- Spülen Sie die Sonde nach der Messung gründlich mit destilliertem Wasser ab.
Figure 2: The Testo 205 being used to measure the pH of a semi-solid food product, demonstrating its application.
4.3. Modus-Taste
Der MODUS button allows you to switch between different display modes or access additional functions, if available. Refer to the on-screen prompts for specific options.
5. Wartung
5.1. Probe Cleaning and Storage
Proper cleaning and storage are essential for maintaining the accuracy and lifespan of the pH probe.
- Nach jedem Gebrauch: Rinse the pH probe thoroughly with distilled water to remove any residue from the measured medium.
- Zur Lagerung: Always place the storage cap, filled with gel electrolyte, back onto the pH probe. This prevents the probe from drying out and ensures its readiness for future measurements.
- Tiefenreinigung: If the probe becomes heavily soiled, consult specialized cleaning solutions for pH electrodes. Avoid abrasive materials.
5.2. Replacing the pH Probe
The combined pH measuring tip with temperature probe is user-replaceable. If the probe's performance degrades significantly despite proper cleaning and calibration, it may need replacement.
- Gently twist and pull the old probe assembly from the main unit.
- Align the new probe assembly with the connector on the main unit.
- Push and twist gently until the new probe is securely attached.
- After replacing the probe, perform a full calibration as described in Section 4.1.
5.3. Batteriewechsel
When the battery indicator appears on the display, replace the batteries as described in Section 3.1.
6. Fehlerbehebung
| Problem | Mögliche Ursache | Lösung |
|---|---|---|
| Inaccurate pH readings | Probe not calibrated; dirty probe; dried-out probe; expired buffer solutions; damaged probe. | Perform calibration (Section 4.1); clean probe (Section 5.1); rehydrate probe in storage solution; use fresh buffer solutions; replace probe (Section 5.2). |
| Langsame Reaktionszeit | Dirty probe; dried-out probe; low battery. | Clean probe (Section 5.1); rehydrate probe; replace batteries (Section 3.1). |
| Gerät lässt sich nicht einschalten | Leere Batterien; falsche Batterieinstallation. | Batterien austauschen (Abschnitt 3.1); Batteriepolarität prüfen. |
| Display shows "Err" or similar error message | Probe issue; internal fault. | Check probe connection; try cleaning/recalibrating; if problem persists, contact Testo support. |
7. Technische Daten
| Parameter | Wert |
|---|---|
| pH - Electrode | |
| Messbereich | 0 bis 14 pH |
| Genauigkeit | ±0.02 pH |
| Auflösung | PH 0.01 |
| Temperature - NTC | |
| Messbereich | 0 to +60 °C (Short-term to +80 °C max. 5 min) |
| Genauigkeit | ±0.4 °C |
| Auflösung | 0.1 °C |
| Allgemeine technische Daten | |
| Lagertemperatur | -20 bis +70 °C |
| Betriebstemperatur | 0 bis +50 °C |
| Gewicht | 135 g |
| Abmessungen (L x B x H) | 145 x 38 x 167 mm |
| Akku-Typ | 4 x Button cell LR44 |
| Akkulaufzeit | 80 h (Auto Off 10 Min) |
| Anzeigetyp | LCD, 2 lines |
8. Garantie und Support
8.1. Garantieinformationen
Testo products are manufactured to high-quality standards. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Testo webBewahren Sie Ihren Kaufbeleg für Garantieansprüche auf.
8.2. Kundendienst
If you encounter any issues not covered in this manual or require further assistance, please contact Testo customer support. Contact details can typically be found on the Testo webWebsite oder in der Produktverpackung.
Weitere Informationen finden Sie im Testo Store on Amazon.
