Ntron Gasenz Specifications

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Gasenz

Ambient Oxygen Monitor

The Gasenz Oxygen Monitor is designed for the monitoring of oxygen decient atmospheres in any work area where the risk of asphyxiation may occur due to the presence of gases like nitrogen or carbon dioxide.

This compact and rugged % zirconia oxide or electrochemical sensor oxygen monitor is perfectly suited for personnel protection in the gas generation industry and in hypoxic re prevention systems.

FeaturesApplications

» Gas generation (oxygen / nitrogen) » Pharmaceutical industries » Process industries » Food & Beverage industries » Hypoxic Fire Prevention Systems

» Long life, low maintenance zirconia or electrochemical sensor technology

» Measurement range: 0 to 25% O

» Compact ambient oxygen monitor

» Audio/ visual alarm indicator

» LCD + 4 button multifunction keypad

» Simple Installation (only power lead

required)

Issue No: GASENZ_01_V1_EN_0819

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Gasenz

Ambient Oxygen Monitor

Proven sensor technology

With a choice of either zirconia or electrochemical sensor technology the Gasenz oers reliability, accuracy and exibility. Both technologies have a broad measurement capability allowing the user to measure from selected ranges from 1ppm to 96% oxygen.

Zirconia sensor

The Ntron zirconia oxygen sensor is a nondepleting zirconia solid electrolyte sensor. A small capillary on the sensor controls the diusion of oxygen into the sensor. When heated to over 400°C oxygen is electronically reduced causing current ow through the zirconia electrolyte. Zirconiumoxide allows the movement of oxygen ions through the substrate from a high to a low concentration. The measurement of oxygen is determined by the current owing through the electrodes. The zirconia sensor has an unlimited shelf life without the loss of calibration and has an expected life in excess of 5 years. The zirconia sensor is not position sensitive and has low cross sensitivity to other gases and does not dry out.

Low maintenance and cost of ownership

Due to the highly stable nature of the sensor, a calibration interval of once per year is required, allowing for signicant cost savings. The construction of our zirconia oxygen sensor means that only 100 mL/ min of sample gas is required, providing application exibility and further potential cost savings.

Electrochemical sensor

The key elements of the electrochemical sensors are a membrane, cathode, anode, electrolyte and measurement circuit. The sensing membrane (covering the cathode) is made of PTFE and is mounted over a metal perforated electrode. The space between the membrane and the electrode is lled either with an aqueous alkaline or an acid electrolyte. In normal operation, all portions of the anode and cathode are immersed in the electrolyte. As oxygen diuses through the membrane into the electrolyte it causes a reaction between the cathode and anode generating an EMF. This current is proportional to the amount of oxygen present in the sample gas. In the absence of oxygen there is no output from the electrochemical sensor, meaning only one calibration is required.

Sensor contruction

The main body of the sensor is fabricated from high density PVDF. The supporting ring at the face of the sensor is constructed of stainless steel. This results in an oxygen sensor that is chemically resistant to most sampling atmospheres and can be used with trace solvents and hydrocarbons present in the sample gas, unlike zirconia (due to the high temperature of the sensor).

Installation 󰍍exibility

Designed for the ambient detection of low Oxygen concentration with ease of installation.

Fast response time

Zirconia oxygen sensors respond very quickly to oxygen concentrations in both directions with a T90 of less than 10 seconds within a set range.

Application Setup

4-20mA & Relay

interface cabling

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Gasenz

Technical Speci󰍐cations

Ambient Oxygen Monitor

Performance

Transmitter Model Gasenz

Measurement technology Zirconia (ZR) Electrochemical (EC)

Measurement range 0 to 25%

Output resolution ( for %) 0.01%

Accuracy ±1% of range

Response time (T90) <10 seconds

LDL (Sensitivity) 0.01%

Temperature range -20˚C to +50˚C 0˚C to +45˚C

Pressure range 900 to 1100 mBar

Linearity 1% of range

Life expectation 3-5 years 1 year

Humidity 0-95% RH non-condensing

Shelf life No shelf life Up to 6 months

abs

Electrical Input / Output

Power supply 100-240 VAC 24 VDC

Power consumption Maximum load 160mA

Signal output 4-20mA current loop powered

Digital communications RS232

Digital output options

Display format % O

Visual indicators LCD, audio and visual alarm indication

(2 relay outputs assigned to control light tower indicator)

1 off relay, dry contact 5 Amp rated

Mechanical Speci󰍌cations

Dimensions 145mm (h) x 110mm (w) x 93mm (d) incl. cable glands

Weight Approx 250g

Wetted materials Stainless steel

Mounting Wall

Ingress protection IP65 enclosure

Housing material ABS

Certi󰍌cation

Complies with EMC Directive 2004 / 108 / EC. UL/ETL Certi󰍐cation Number: UL-61010-1

Issue No: GASENZ_01_V1_EN_0819

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Gasenz

Technical Drawings

Ambient Oxygen Monitor