What should the operator ensure after submerging the temperature measuring device?

The operator should allow the temperature measuring device to acclimate to the surrounding temperature after submersion. This process is critical because it ensures that the device accurately reflects the temperature of the concrete it is measuring. When the device is placed in a medium like concrete, it needs time to adjust and stabilize to the same temperature as the concrete to give an accurate reading.

If the device is removed immediately, it won’t have had time to reach thermal equilibrium, which can result in incorrect temperature readings. Measuring the pressure of the concrete or pressing the concrete around the device does not directly relate to obtaining an accurate temperature measurement, and while adjustments to the concrete might be necessary for some tests, they do not pertain to ensuring an accurate temperature reading in this context. Therefore, allowing the device to acclimate is the crucial step that ensures the integrity of the temperature measurement process.