What could potentially render a methane detector sensor defective?

Holding a methane detector in a bleeder for extended periods can potentially render the sensor defective due to the continuous exposure to pressures or conditions beyond what the sensor is designed to handle. A bleeder is typically a point in a gas handling system where gas is released or vents to the atmosphere. Prolonged exposure to such a condition can lead to sensor degradation or damage, as the sensor may become saturated with gas or its components might be adversely affected by constant flow or turbulence. This can inhibit its ability to accurately detect methane levels, leading to false readings or failure to detect hazardous gas concentrations altogether.

In contrast, using the detector frequently, calibrating it monthly, or exposing it to direct sunlight generally do not lead to immediate sensor defects. Frequent use is a part of regular operational practice and is expected for functionality. Monthly calibration is essential for maintaining accuracy and reliability, while exposure to direct sunlight, although not ideal, doesn’t typically cause immediate damage unless the sensor is left in extreme conditions for a prolonged time.