Toxalert TOX-O2/4 - Manual

OXYGEN SENSOR MODEL TOX-O
2
FEATURES
• 10 year sensing element life • Power indicator
• Low voltage circuits • Sensor failure indicator
• Linear 4 to 20 mA output • Loop current indicator
• Explosion Proof Housing • Interfaces directly to DDC systems
• Meets ASHRAE Std. 15-1994 • Relay output indicators
• Two Form C relay outputs
GENERAL DESCRIPTION:
The Models TOX-O
2
oxygen sensors are an electrochemical cell
with extremely long sensor element life. The sensor element is 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 dependent on the concentration of gases (O
2
in this case)
in the atmosphere. A voltage is generated that is proportional to
the rate of consumption of oxygen in the sensor cell.
Most electrochemical sensors use a very thin plastic membrane
and have a short life. The TOXALERT oxygen sensor uses a heavy
membrane which allows gas to diffuse into the sensor making it
extremely robust and stable, plus it gives the element exception-
ally long life expectancy, but still responds quickly to oxygen con-
tent changes.
The model TOX-O
2
/4 oxygen sensor/controller is designed to moni-
tor oxygen levels and to close “warning” contacts, when oxygen
levels drop to 19.5%, for the operation of ventilation equipment.
A second set of “alarm” contacts are provided to operate alarm(s)
and /or signal building management systems (BMS), when oxygen
levels drop to 18.5%. The warning and alarm setpoints are field adjustable.
The model TOX-O
2
/1 oxygen sensor/transmitter is designed to monitor oxygen levels and has
a linear 4 to 20 mA output signal. This signal may be interfaced directly to a TOXALERT
control unit or any other standard BMS controller and provide actual percent oxygen concen-
tration for control and/or display.
TOXALERT INTERNATIONAL, INC., P.O. BOX 159, MOUND, MINNESOTA 55364 (952) 472-4541 FAX (952) 472-4960
Visit our website at www. toxalert. com
TM TOXALERT
DATA
SHEET
TOX-O
2
/1