In 2006 we upgraded the microprocessor of the industry favorite H-810 to allow three independently programmable calibrations as well as altitude correction factors. This one unit can replace up to 6 air samplers. Three AC units with different calibrations and three DC units with three different calibrations.

The Air Volume Totalizer portion of the sampler is composed of an enclosed air-turbine which rotates at speeds proportional to the air velocity of the sampled air. The turbine’s rotation is sensed by a reflective sensor/breaker disk. The microprocessor converts the signal to volume and displays the flow rate, total volume, and elapsed time on the LCD readout.

The operation of the Model H-811 is a very simple, four-step procedure, and the training required by  the user is relatively short. Its operational procedure is:

1. Connect to a power source.

2. Install the sample holder with filter media.

3. Turn power switch on.

3. Press the start key.