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51, 52, 53, 54 Series II
Service Manual
12
Basic Maintenance
Basic maintenance required by the thermometer is discussed in this section.
Cleaning the Thermometer
Caution
• To avoid damaging the thermometer, do not use aromatic
hydrocarbons or chlorinated solvents for cleaning. These
solutions react with the plastics used in the thermometer.
• Do not allow the LCD to get wet.
• Do not remove any of the lubricant from the battery/pca
connection.
Clean the thermometer case with a mild detergent and water.
The pca may be washed with isopropyl alcohol or deionized water and a soft brush. Dry
the pca with clean dry air at low pressure, then bake it at +50
o
C (+122
o
F) for 24 hours.
Changing the Batteries
WWarning
• Replace the batteries as soon as the low battery indicator (B)
appears. The possibility of false readings increases when
the batteries are low. False readings can lead to personal
injury.
• To avoid electrical shock, disconnect the thermocouple(s)
before opening the battery door.
Caution
• Do not attempt to recharge the batteries.
• Do not dispose of the batteries by placing them in fire.
• Follow local laws or regulations when disposing of
batteries.
• Match the positive (+) and negative (-) polarities of the
batteries with the markings located on the case.
To replace the batteries, refer to Figure 5 and use the following procedure:
1. Turn the thermometer off.
2. Loosen the battery compartment door screw and remove the battery door.
3. Replace the three AA batteries. To simplify battery installation, put the new batteries
into the unit positive end first.
4. Replace the battery compartment door and tighten the screw.