Toxalert TOX-O2/4 User Manual

Toxalert, Data, Sheet

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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

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