Myron-l TH1 User Manual download pdf (Page 24)

Solvents should be avoided. Shock damage from a fall may cause

instrument failure.

A. Temperature Extremes

Solutions in excess of 71°C/160°F should not be placed in the cell

cup area; this may cause damage. The pH sensor (TPH1 & TH1) may

fracture if the TechPro II temperature is allowed to go below 0°C/32°F.

Care should be exercised not to exceed rated operating temperature.

Leaving the TechPro II in a vehicle or storage shed on a hot day can

easily subject the instrument to over 66°C/150°F.

This will void the warranty.

B. Battery Replacement (LO BATT)

Dry Instrument THOROUGHLY. Remove the four (4) bottom screws.

Open instrument CAREFULLY. Carefully detach battery from circuit

board. Replace with 9 volt alkaline battery. Replace bottom, ensuring the

sealing gasket is installed in the groove of the top half of case. Re-install

screws, tighten evenly and securely.

C. pH Sensor Replacement (TPH1 & TH1)

Order model RPG. When ordering, be sure to include the model and

serial number of your instrument to ensure receipt of the proper type.

Complete installation instructions are provided with each replacement

sensor.

D. Cleaning Sensors

1. Conductivity or TDS

The cell cup should be kept as clean as possible. Flushing with clean

water following use will prevent buildup on electrodes. However, if very

dirty samples — particularly scaling types — are allowed to dry in the

cell cup, a lm will form. This lm reduces accuracy. When there are

visible lms of oil, dirt, or scale in the cell cup or on the electrodes,

use Isopropyl alcohol or a foaming non-abrasive household cleaner.

Rinse out the cleaner, and your TechPro II is again ready for accurate

measurements.

2. pH (TPH1 & TH1)

The unique pH sensor in your TechPro II is a nonrellable combination

type that features a porous liquid junction.

It should not be allowed to dry

out.

However, if this occurs, the sensor may sometimes be rejuvenated

by rst cleaning the sensor well with Isopropyl alcohol or a liquid spray

cleaner such as Windex™ or Fantastic™ and rinsing well. Do not scrub

or wipe the pH sensor.

Then use one of the following methods:

1. Pour a HOT salt solution ~60°C/140°F, preferably potassium

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Myron-l TH1 User Manual Page 24