The Honeywell Analytics 54-45-02VD ToxiPro polycarbonate hydrogen sulfide (H₂S) single-gas detector is a handheld, single-gas detector that uses an electrochemical cell sensor to measure hydrogen sulfide (H₂S) continuously, and that has audio and visual alarms, which alert simultaneously when H₂S reaches any of four preset levels. The detector has a backlit, alphanumeric LCD screen that can be adjusted by the user to show the current gas level, the maximum gas level recorded during the current operating session, the battery level, and the time. The LCD display also features a blinking heartbeat icon to indicate normal functioning. It is operated and adjusted with a single push button. This detector is used to indicate potentially harmful levels of H₂S gas naturally occurring in the environment; in a variety of occupational settings such as petroleum refineries, tanneries, sewage treatment facilities, and paper mills; and in other personal safety, educational, and ambient monitoring applications.

This detector is set to alert to when gas levels reach any of four limits: a low-alarm level, indicating moderate danger; a high-alarm level, indicating significant danger; a short-term exposure limit (STEL), the maximum gas concentration to which workers can be exposed continuously for a short period of time without serious risk, and a time-weighted average (TWA) limit, the maximum average exposure that personnel can experience over an eight-hour work shift without serious risk. The three bright, LED alarm bars flash yellow in low-alarm and TWA conditions, and red in high-alarm and STEL conditions, to help alert the user to potentially dangerous levels of H₂S in high-noise environments. Once the gas exposure alarm initiates, the detector records the maximum gas exposure reached during its current operating session. The detector logs and retains data of the 100 most recent gas exposure events, which it can transmit via an infrared USB adapter to a personal computer (both sold separately).

This detector is powered by a replaceable lithium manganese dioxide battery for up to one year or 9,000 hours of operating life. To ensure performance, the detector tests its sensor integrity, circuitry, and audible and visual alarms upon activation. It tests its battery upon activation and continuously during operation. This detector comes with a built-in top ring to allow the unit to be clipped to a belt, waistband, or lapel. It has a clear polycarbonate body with a thermoplastic elastomer (TPE) overmold to help protect it against damage. It is water resistant, and is compatible with the Honeywell Analytics manual sample draw kit and vibrating alarm attachment (both sold separately). It has a European Conformity (CE) and ATEX certification for safety of electrical and electronic devices, and it is classified by Underwriters Laboratory (UL) to U.S. and Canadian standards as an Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I and II, Division I, Group A, B, C, D, E, and F. It has an ingress protection (IP) rating of 66/67.

Specifications

*H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.

A gas detector is a safety device that detects and monitors various toxic, combustible, and flammable gasses in an area, and which can also register a decrease in ambient oxygen. Gas detectors can be portable or stationary, and are typically classified by their detection methods, which include catalytic, electro-chemical, point infrared, open-path infrared, semiconductor, thermal path conductor, and paper tape detection. Gas detectors are first calibrated to known gasses that serve as a reference points. Their sensors can then be used to measure ambient gas concentrations in comparison to the calibration gasses. When gas concentrations exceed a pre-set limit, an alarm or signal is triggered, alerting the user to potential danger. Pre-set limits often include a low-alarm level, indicating a gas concentration that poses a moderate danger; a high-alarm level, indicating a gas concentration that poses a large danger; a short-term exposure limit (STEL), the maximum gas concentration to which workers can be exposed continuously for a short period of time without serious risk of harm, and time-weighted average (TWA) limit, the maximum average exposure personnel can experience over the course of an eight-hour work shift without serious risk of harm. Most gas detectors also feature LCD screens that provide a variety of information including gasses detected and their concentrations, pre-set exposure limits, and battery level.

Gas detectors have a variety of industrial and governmental applications, such as in fire and rescue, mining, construction, petroleum refineries, tanneries, sewage treatment facilities, and paper mills. Portable gas detectors are typically used to monitor the air around personnel, are worn on clothing or on belts or harnesses, and are powered with rechargeable or disposable batteries. They generally require periodic calibration, testing, and battery recharging or replacement, although some fixed-life detectors are designed to perform for a number of years without calibration or battery replacement before being discarded. Stationary gas detectors are typically powered electrically and mounted near the process area of a plant or control room. They also require periodic service, testing, and calibration.

Honeywell Analytics manufactures and distributes fire and gas detection equipment. The company, founded in 1959 as J&S Sieger Ltd, is based in Poole, England.