Immersion in Water
Temperature differential between the test item and the water can influence the outcome (leakage) of an immersion test. Increasing the test item temperature above the water temperature for the immersion test usually includes heating of the test item to establish a pressure differential (while cooling) to determine if the seals or gaskets leak under relatively low-pressure differential, and to induce expansion/contraction of the hardware. Although desired, establishing a specific temperature differential for fording tests is often impractical due to the size of the hardware
How Trimble Tests for Immersion
The minimum requirements to pass the immersion test are heating a unit for one hour to a core temperature of 49 °C (120 °F). Within one minute after the removal from the heat source, the device is plunged into 22 °C (72 °F) water to a depth of 1 meter, and kept there for 30 minutes. The unit must function properly at completion of test to pass.
Trimble Kenai®, Yuma® 2, Nomad® 1050, Juno® T41 and Ranger™ are all either IP65, IP67, or IP68 certified (depending on model), meaning they are dust tight and protected against temporary immersion. The PG200 is IP65.