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2.5 Probes
The Model 12B is supplied with either of two probe styles. For applications below
525°F [274°C] / 850 psi [58 bar], an economical probe is available with a PTFE
wetted insulator. It can not be used if either parameter (525°F [274°C] or 850 psi
[58 bar]) is exceeded.
For all other applications, probes with the zirconium oxide (ceramic) insulators
must be used. The high pressure (HP) probes are easily recognized by the
brazing between the insulator and the body (fig 1). The two styles of probes are
not interchangeable and will not fit in a receptacle designed for the other, the LP
probe uses a threaded fitting, the HP a compression fitting. In this I.O.M., all
instructions address the HP style probe (see figure 1). Refer to the water
column I.O.M. for details on both the HP and LP probes.
Note: The probe hex nut and hex jam nut located on the post used for the
electrical connection have been pre-torqued to exact specification. If the
hex nuts are inadvertently moved, the probe must be replaced.
Figure 1 – Probe Assembly