Seeing the abbreviation “POS” on a digital thermometer display can be confusing. This reading is not a temperature value but a status message indicating an issue with measurement. Understanding this code is the first step toward obtaining an accurate body temperature reading. This article explains the meaning of “POS” and provides steps to resolve the display issue.
Interpreting the “POS” Reading
The abbreviation “POS” on a digital thermometer display stands for “Position Error.” This message appears because the device’s sensor, often an infrared monitor in an ear thermometer, cannot establish stable thermal equilibrium. It signals that the probe is not correctly or securely placed at the measurement site, preventing the thermometer from calculating a reliable temperature reading.
Digital thermometers rely on specific placement to function accurately, particularly tympanic (ear) models that measure heat radiating from the eardrum. If the probe is angled incorrectly or not inserted snugly, the sensor may detect cooler ambient air instead of the body’s internal heat. The internal programming recognizes this unstable measurement environment, displaying the “POS” error code instead of a potentially misleading temperature value.
Resolving the Display Issue
The immediate action is to correct the probe placement to allow for a stable measurement. For ear thermometers, ensure the probe tip forms a secure seal within the ear canal, often by gently pulling the ear to straighten the canal. Also, ensure a clean, new lens filter is attached, as a missing or dirty filter can obstruct the sensor and trigger a positional error.
If proper positioning and a clean lens filter do not clear the message, the issue may relate to device function or power supply. Low battery power can cause erratic error displays, so verifying the battery life is necessary. If the thermometer was recently used, allow the probe to cool to room temperature, as residual heat can sometimes trigger an over-limit error state.
A simple system reset can resolve temporary internal glitches, usually by turning the device off and on, or by removing and re-inserting the batteries. Always consult the specific device’s user manual, as manufacturers sometimes use proprietary codes or have model-specific instructions. If the “POS” display persists, the sensor or probe may be damaged or defective, requiring replacement or contact with the manufacturer.