Myron L TH1 - Manual (Page 24)

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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 film will form. This film reduces accuracy. When there are
visible films 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 nonrefillable 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 first 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