Toxalert TOX-O2/4 - Manual (Page 2)

GUIDE SPECIFICATIONS
TOXALERT INTERNATIONAL, INC., P.O. BOX 159, MOUND, MINNESOTA 55364 (952) 472-4541 FAX (952) 472-4960
Visit our website at www. toxalert. com
MODEL TOX-O
2
/1 ANALOG SENSOR:
Provide an oxygen sensor(s) with a range of 0 to 25% and a linear 4 to 20 mA output signal over
its range. The sensors output shall be designed to work into a minimum of a 500 OHM load. The
sensor shall be housed in an industrial style explosion proof housing. The sensing element shall
be electro chemical diffusion barrier type and be designed for ten (10) year element life. Electro
chemical cells with a three year or less expected life are not acceptable. The sensor shall be 24 vdc
powered and its 4 to 20 mA output shall be directly proportional to the percent of oxygen being
detected. If the sensor should fail, it shall drive its output signal to zero indicating zero percent
oxygen and an alarm condition.
The oxygen sensor shall have the following diagnostic light emitting diodes (LED’s):
1) Power
2) Sensor failure
3) LOOP UP (LED varies in intensity indicating 4 to 20 mA loop current to controller).
Sensor shall have volt meter terminals on face of sensor to indicate percent oxygen being
detected.
MODEL TOX-O
2
/4 RELAY SENSOR:
Provide an oxygen sensor(s) with a range of 0 to 25%, have a 4 to 20 mA output signal and two
adjustable output relays over its range. The sensor shall be housed in an industrial style explosion
proof housing. The sensing element shall be electro chemical diffusion barrier type and be de-
signed for ten (10) year element life. Electro chemical cells with a three year or less expected life
are not acceptable. The sensor shall be 24 vdc powered. If the sensor should fail, it shall drive its
output signal to zero indicating zero percent oxygen and energizing both output relays.
The oxygen sensor shall have the following diagnostic light emitting diodes (LED’s):
1) Warning relay energized
2) Alarm relay energized
3) Power
4) Sensor failure
The warning relay and alarm relay shall be Form C contacts and the relay setpoints shall be field
adjustable without calibration gas. Relay contacts shall be rated for 1 amp at 24 vdc.
Sensor shall have volt meter terminals on face of sensor to indicate percent oxygen being
detected.