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TM
DATA
TOXALERT
SHEET
NITROGEN DIOXIDE SENSOR MODEL TOX-NO2 /ANA
FEATURES: BENEFITS:
• Linear 4-20mA output signal • Industry standard signal can be directed to most controllers
• Optional relay contacts • Reliable operation and monitoring integrity
• Sensor fault indication • False alarm avoidance
• Loop up indication • Simple maintenance
• Convenient diagnostic • Meets or exceeds commercial/industrial safety requirements
GENERAL DESCRIPTION:
The ToxAlert Model Tox-NO2/ANA Nitrogen
Dioxide Sensor utilizes an electrochemical
sensing element and is designed for ambient
monitoring applications. It is intended for use in
fixed monitoring installations, and therefore
continuous operation. The sensor module has a 4
to 20mA transmitter, designed for use in
conjunction with ToxAlert’s model Tox-4ANA
and ToxControl controllers, or any industry
standard 4 to 20mA loop controller . The T ox-NO2/
ANA has an effective range of 0-10 ppm. The
sensor module requires a three-wire connection
from a controller that provides a nominal 24VDC
power source, common, and return signal input.
The module sources current in proportion to the
gas concentration. Optional relay contacts are
available.
Fig. 1
Tox-NO2 1
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 applies its proven technology, allowing gas to diffuse into
the sensor through a stabilizing capillary. Not only is this extremely reliable, but entirely different
diffusion laws apply resulting in low temperature and pressure coefficients and the capability to monitor
gas as a percent volume.
TOXALERT INTERNATIONAL, INC., P.O. BOX 159, MOUND, MINNESOTA 55364 (952) 472-4541 FAX (952) 472-4960
Visit our website at www. toxalert. com
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SPECIFICATIONS:
MODEL TOX-NO2 /ANA
• Type: Electro-chemical cell diffusion barrier type
• Range: 0 to 10 ppm nitrogen dioxide in air
• Response Time: 30 seconds to 90% indication
• Typical life: Two years in normal service
• Accuracy: +/-5% of Full Scale
• Resolution: 0.1 ppm
Electrical Data:
• Input voltage: 24VDC
• Input power: 1.2W
• Input current: 46mA @ 24 VDC
• Loop resistance: 850 Ohms
Unit Construction:
• Mounting: Conduit
3
/4” NPT or flexible cable
•Housing: Polystyrene, impact-resistant,
nonflammable, IP66
•Operating Temperature: 4° to 122°F
(-20°C to 50°C)
•Relative Humidity: 15 to 90% RH
non-condensing
•Output Signal: Linear 4 to 20 mA std.
Optional Relays
• Signal Output - Trouble: 3 mA
•Wiring: 3 wire non-isolated (Additional wiring
required for relay option)
• Physical: H: 5.11”, W: 5.11”, D: 2.95”
(13.0 x 13.0 x 7.5 cm)
• Weight: 14.2 oz.
How to order (sensor part numbers)
Tox-No2/X
(Replace “X” with one of the following)
1= 4-20mA output
2= 4-20mA output with optional
Nema 7 enclosure
4 = 4-20mA & relays
5= 4-20mA & relays with optional
Nema 7 enclosure
TOX-NO2/ANA Revised 3/09 TM
TOXALERT INTERNATIONAL, INC., P.O. BOX 159, MOUND, MINNESOTA 55364 (952) 472-4541 FAX (952) 472-4960
Visit our website at www. toxalert. com
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