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Nitrogen Dioxide Monitor

Model Z-1400XP
Nitrogen Dioxide Monitor

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Theory of Operation

The sensing element of the instrument is an electrochemical cell. The cell is a four-electrode type, which contains a working and an active auxiliary electrode. The signal from the auxiliary electrode is used for temperature compensation and to improve the selectivity of the entire sensor. The sensor response is linear with the concentration of the target gas in air.


Gas Concentration Meter Output
Carbon Monoxide

300 ppm

0 ppm

Hydrogen Sulfphide

15 ppm


Sulfur Dioxide

5 ppm


Nitric Oxide

35 ppm

0 ppm


1 ppm

1 ppm


100 ppm

0 ppm

Hydrogen Cyanide

10 ppm

0 ppm

Hydrogen Chloride

5 ppm

0 ppm


100 ppm

0 ppm



  • Portable
  • Internal Pump
  • Rechargeable Battery
  • Remote Sampling
  • Simple to Use
  • TWA, STEL and Peak
  • Audible Adjustable Alarm
  • Data Logging


Environmental Sensors Co.'s Nitrogen Dioxide Meter is a portable desktop instrument that measures nitrogen dioxide concentration in a range of 0-20 ppm and a resolution of 0.1 ppm.

The instrument makes it possible to monitor nitrogen dioxide vapor in air. The insturment has an LCD display giving concentrations in ppm every 10 seconds, a low battery indicator, and an audible alarm that can be set at any level from 0-20 ppm.

With the touch of a button, the meter displays STEL (average of every 15 min.), TWA (8 hour average) and Peak.

The internal pump makes it possible to sample from hard-to-reach areas or confined spaces by attaching a flexible tube to the meter.

Data Logging

The Z-1400XP meter stores all of the exposure points for up to 5 logs (a log is created in the instrument's internal memory each time it is used). A log contains: date, time, number of exposure points, the interval between each point, and the actual exposure points. All of the log files can be easily uploaded to PC using components vailable within the Microsoft Windows Operation System or the termianl software included with the instrument.


Meter Spec

Sensor Type Electrochemical

Nominal Range

0-20 ppm


200 ppm

Sensor Life

> 2 years


0.1 ppm

Min. Detectable

0.1 ppm

Response Time

< 35 sec.

Warm-Up Time

60 sec.

Operating Temperature

-25 °C to 35 °C

Pressure Range

Atm ± 10%

Relative Humidity

15 - 90 % non-condensing


Audible 80db


H x D x W: 7.5" x 5.75" x 2.75"


900 grams


9 Volt Alkaline Battery


One Year
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