I. GENERAL DESCRIPTION
The Cal 2000 is a battery-powered, portable electrochemical gas generator
designed to calibrate toxic gas sensors. Fast warm-up time allows the
instrument to be turned off between remotely located sensors saving battery
life and avoiding generation of unwanted gas. A built-in mass flow sensor
provides accurate flow control and the ability to measure externally provided
sample draw flow rates. The Cal 2000 uses the following components to
produce the calibration gas/air mixture:
Internal Micro Pump
A small, rotary vane, micro air pump draws in ambient air to blend with the
generated gas. The pump may be disabled for use in calibrating sample
draw instruments.
Electrochemical Generating Cell
The electrochemical generating cell contains an electrolyte solution and
either inert or consumable electrodes, depending upon the gas being
generated. A precise concentration of gas is produced when a known
amount of current and a known amount of air is supplied continuously
to the cell. Each cell has a built-in memory chip that tells the Cal 2000
instrument what type and range of gas can be generated and how much
cell life is remaining. The electronics board mounted to the cell should
never be removed from the cell. Removal of this board will void warranty
and destroy the cell. Due to the design characterization of the cell, the unit
must be oriented flat (on the units feet) for correct concentration output.
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