Pocket CO

Pocket CO - Miniature Carbon Monoxide Detector / Dosimeter

Pocket CO Model 300 is a miniature carbon monoxide detector / dosimeter designed by KWJ Engineering, Inc.. It contains an electrochemical sensor that responds to carbon monoxide, and a microprocessor that converts the output of that sensor into a digital reading of parts-per-million (PPM) on the display (see parts-per notation). At certain concentrations of carbon monoxide (pre-programmed at 50ppm, 125ppm, and 400ppm), the device pulses its alarms with increasing frequency to alert its user of the danger of carbon monoxide poisoning. The range on the display is 0 - 500 ppm, in 1 ppm increments. Pocket CO also maintains and displays dosimetery information, including the maximum exposure, the time of maximum (since turned on), the total-exposure in ppm-hrs, and the time-weighted average exposure (TWA). Pocket CO weighs approximately 1 ounce, and is about the size of a typical key-fob.
The device was first introduced in 2000 as "Pocket CO Model 100" by Transducer Technology Inc (TTI). TTI was later merged into KWJ Engineering Inc. The Model 100 was functionally similar to the current model (Model 300), but did not have a loud alarm.
The Model 200 was later introduced in 2007, which included a loud alarm (82dB at 24 inches) and optional vibrator. Both the Model 100 and 200 required sending the instrument to KWJ for battery replacements and calibration service.
In 2008 KWJ announced the Model 300, which had major design revisions from the Model 200. Among them, the case was changed from gray to yellow, a vibrator now came standard, the back light was available on demand, a 50 ppm alarm level was added, and the battery was now user replaceable. KWJ also announced at this time a "calibration kit", enabling customers to calibrate the instrument themselves.
In Summer 2008, KWJ announced the Model 300S, a special version for SCUBA divers wanting to check CO levels in their tanks before diving.

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