If batteries are accidently installed in the wrong polarity, a positive temperature coefficient (PTC) thermistor will protect the instrument’s electronic circuitry. The instrument will operate once batteries are properly installed and the PTC thermistor is allowed to cool.
3.2Probe Installation
Install the probe by sliding the end of its hose over the gas inlet port on the top right side of the instrument as shown in Figure 3.
Figure 3. Probe Installation
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