Toxalert Tox-HCI/ANA - Manual

HYDROGEN CHLORIDE SENSOR MODEL TOX-HCl/ANA
FEATURES: BENEFITS:
•••• Linear 4-20mA output signal •••• Industry standard signal can be directed to most controllers.
•••• Automatic low sensitivity check •••• Reliable operation and monitoring integrity.
•••• Power up & calibration delays •••• False alarm avoidance.
•••• Convenient diagnostics •••• Simple maintenance.
Previous electrochemical sensors of this general type have used very thin plastic membranes.
This results in handling and stability problems and high temperature and pressure coefficients
which limit the usefulness of the device. The Toxalert sensor takes a radically different
approach by allowing gas to diffuse into the sensor through a simple capillary. Not only is this
extremely robust and stable, but entirely different diffusion laws apply resulting in low
temperature and pressure coefficients and the capability to monitor gas as a percent volume.
1 of 2
GENERAL DESCRIPTION:
The Toxalert hydrogen chloride sensor
module is designed for use in conjunction with
Toxalert and other standard 4-20 mA loop
controllers. The module sources an output
current in proportion to the hydrogen
chloride concentration. Toxalert utilizes
hydrogen chloride sensors that are
electrochemical cells. They are the self-
powered, diffusion limited, metal-air battery
type. The rate at which atmosphere gases can
get to the electrode through a diffusion
barrier is then solely dependent on
concentration of gases in the atmosphere.
Current is generated that is proportional to
the rate of consumption of hydrogen chloride
in the cell.
TOXALERT ™
TOXALERT INTERNATIONAL, Inc., PO Box 159, Mound, MN. 55364 PHONE: (952) 472-4541 • FAX: (952) 472-4960
www.toxalert.com