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The highest water temperature is only one part of a hot-water level switch specification. Cold makeup water, a heating cycle and shutdown can change local conditions around the element. A sensor selected from a single steady temperature may not address the actual sequence at its mounting point.
Describe the cycle at the connection
State where makeup water enters relative to the sensor. A probe directly exposed to an inlet can experience turbulence and rapid temperature changes unlike the bulk tank condition. Record the normal fill sequence, heating stages, cleaning fluids and cooling periods.
Keep pressure and temperature paired for each stage. Hot water in an open tank and hot water in a pressurised vessel are different duties. Do not infer an assembly's pressure suitability from the sensor material or from a temperature headline.
| Operating stage | Selection question |
|---|---|
| Cold makeup | Does the incoming stream strike the element or disturb the local surface? |
| Heating | How do the wetted element, connection and housing temperatures change? |
| Steady operation | Are bubbles, steam or deposits present at the required switching point? |
| Cooling or cleaning | What chemical exposure, pressure change and residue must the assembly tolerate? |
Select the hot-water level switch by the required action
State whether the signal starts makeup, warns of a low operating level or forms part of a protective shutdown. Those tasks may need different arrangements. This tank-selection discussion does not qualify an instrument for boiler low-water protection; that application requires its own approved equipment and system design.
For continuous level indication, METRAVON MV-RD12G is a liquid radar option with a finned thermal assembly. Evaluate the actual process connection and seal with the cycle described above. Its continuous output must not be presented as an inherently independent point-switch function.
Accept the installation through a representative cycle
Agree on observations during makeup, heating and normal drawdown. Record any unstable or unavailable indication as well as the periods that work correctly. If point detection is required, verify the real transition and reset; an electrical input simulation alone cannot prove that the liquid reaches the sensing element correctly.
Q1. Is a cold-water workshop trial enough?
It can establish basic operation, wiring and some mounting details. It cannot establish behaviour during the hot cycle, steam exposure or thermal movement. Keep those checks open until supported by suitable evidence.
Q2. Can a standard RF probe be assumed suitable because it has no moving float?
No. Probe insulation, seals, electronics and pressure construction still have limits. A change of measurement principle does not remove the need for a hot-service specification.
Summary
Specify the complete water cycle and the required control action. Provide inlet position, temperature-pressure stages and alarm duty for a continuous-radar assessment or clarification of the required point-switch documentation.
