A pH meter (also known as phosphine gas detector or phosphide detector) is an instrument that measures the amount of phosphine in the air. These devices typically feature a portable sensor that can be clipped to clothing or carried by hand, a display screen, and alarms to alert workers of dangerous levels of phosphine. Many models also allow for calibration, bump testing, and data logging.

Phosphine is a flammable, colorless gas with a garlic or rotting fish odor. It is used in the fumigation of grain, tobacco, and leaf-stored tobacco products to protect against pest infestation. Other uses include as a dopant in the production of n-type semiconductors, and to manufacture flame retardants for cotton fabrics. It is highly toxic when inhaled at high concentrations and can cause fluid accumulation in the lungs, which may lead to shock or respiratory failure.

Measuring Ammonia Levels: Exploring the Function of Ammonia Meters

PH3 gas detectors are used to ensure worker safety in industrial applications where phosphine is present. These devices are especially useful in fumigation activities, where it is essential to measure and monitor PH3 concentrations to avoid exposing employees to harmful levels of the toxic gas.

To properly use a PH3 meter, users should read the product manual or watch any accompanying support videos before using the device. Ensure the monitor is in fresh air, and that it has been fully calibrated. It is recommended to perform a daily bump test on the meter, or every week in LIFE-THREATENING applications. These tests involve exposing the PH3 monitor to a burst of PH3 gas to ensure it responds as expected and can accurately measure PH3 concentrations in the air.