94-1009.04January 2009

Nanotechnology Metal Oxide Semiconductor (NTMOS)H2S Gas Sensor

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New Toxic Gas Detector

Functional

▪ Provides H2S gas detection in extreme temperature and humidity conditions

▪ Detects H2S faster and more accurately than traditional Metal Oxide Sensors (MOS)

Flexible

▪ Can be installed as a stand-alone sensor or combined with a display for local indication

Reliable

▪ Lasts longer and stays awake more than previous MOS H2S gas sensors

▪ Provides accurate and long-lasting operation in extreme climates, as proven through third-party performance testing to the ISA-92.0.01 standard

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Engineered and Designed for H2S Detection

Automatic Fault Diagnostics Indication via Current Output

Explosion-Proof, Stainless Steel Housing Approved for Class 1

Division 1 Hazardous Areas

NTMOS Technology Means Higher Sensitivity and Long-

lasting Detection

Linear 4-20 mA Output Proportional to 0-100 ppm H2S

Onboard Humidity Sensor Provides an Accurate

Reading in Extreme Climates

Automatic Calibration Line Provides Easy One-person Calibration

Integrated Temperature Sensor for Compensation

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Certified to ANSI/ISA Performance Standard

Performance Requirements for Toxic Gas-Detection Instruments: Hydrogen Sulfide

ISA–92.0.01: New World Standard for Toxic Gas Detection

2.1 This Standard addresses the details of construction, performance, and testing of portable, mobile, and stationary electrical gas-detection instruments operating at ambient temperatures and pressures used to provide a warning of the presence of toxic gases in air. Instruments used to detect flammable (explosive) concentrations of toxic gas(es) when the LEL exceeds the TLV are excluded.

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New World Standard for Toxic Gas Detection

Specification

Full Scale Range 10 to 100 ppm H2S 0 to 100 ppm H2S *

Temperature Range 14 to 122 °F (–10 to 50 °C) -40 to 149 °F (–40 to 65 °C) *

Relative Humidity Range 15 to 90% 15 to 90% *

Response Time (Full Scale)T20 < 10 seconds T50 < 30 seconds

T20 2 seconds * T50 3 seconds *

Accuracy / Linearity10% of applied gas

concentration or 2 ppm10% of applied gas

concentration or 2 ppm *

92.0.01

* In accordance with FMID 3033318

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Designed for Toxic Gas Applications

Designed to be installed where low levels of H2S can be detected to avoid the threat to human beings:

▪ Crude Oil Tank StorageTank farms storing crude oil and H2S require continuous monitoring for gas leaks. In addition tothe tanks, common leak sources include pipes andvalves, which require sensors.

▪ Remote Oil / Gas Well SitesOil and gas well production sites require H2S protection in and around the site. Common monitoringlocations include the well heads, flare stacks, and storage tanks.

▪ Oil / Gas Drilling SitesLeaks, such as blowouts in oil drilling applications,are subject to releasing large quantities of H2S gas into areasaround the site. Typical gas monitoring locationsinclude the driller stand, bell nipple, shale shaker, and mud tank.

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Superior H2S Gas Detection

While conventional electrochemical (E-Chem) gas sensors are typically used to detect H2S Gas…

…our NTMOS sensors detect H2S faster, are more accurate, and last longer in extreme temperature and humidity applications.

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Environmental Effects on Sensor Performance

Hig

hM

edLo

w

Hum

idity

TemperatureHighMedLow

NTMOSE-Chem

NTMOS

NTMOS

NTMOS

NTMOS

NTMOS

NTMOS

NTMOS

NTMOS

E-Chem

E-Chem

E-Chem

E-Chem

E-Chem

E-Chem

E-Chem

E-Chem

No Effect

Affects Performance

Affects Performance

and Sensor Life

E-Chem NTMOS

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Comparing Technologies

Accuracy in High Temperatures No No Yes

Longevity in Extreme Climates No No Yes

Accuracy in Humid Air No No Yes

Accuracy in Dry Air Yes No Yes

Stable Calibration Over Time No Yes Yes

Conventional Electrochemical

Det-Tronics NTMOS Sensor

Metal Oxide Sensor (MOS)

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How Does the NTMOS Sensor Work?

Target gas reacts with the metal oxide and changes the resistance proportional to the gas concentration.

The large sensor surface area absorbs the gas vapor, thus lowering the potential barrier and sensor resistance.

Because this resistance change is non-linear and specific to each sensor, it is logarithmically correlated to the gas concentration.

Sensor is Incorporated With

the Microheater

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Nanotechnology MOS = More Surface Area

Advantages:

Increased surface area means a faster response and higher sensitivity — typically T50 is less than 5 seconds

Pure material design avoids syndrome of sensor falling asleep

NTMOS tolerates extreme temperature and humidity ranges

Rugged and long lasting sensor technology

Nanotechnology, which deals with devices typically less than 100 nanometers in size, is making a significant contribution to the fields of computer storage, semiconductors, biotechnology, manufacturing and energy.

The additional surface area (~10X) is what gives the NTMOS its advantage over original MOS sensor technology.

NanoFact

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Ordering the NTMOS

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Compatible with FlexVu Display

Local Display with Relay, Alarm, and Fault Outputs Combined with isolated 4-20mA

4-20 mA output with HART

Nonintrusive Calibration

Fully Explosion-Proof Housing

Available in 316SS Construction

Easy-to-Set Alarm Levels

Access to Alarm and Fault History

Multiple Conduit Access PointsDet-Tronics NTMOS Shown with FlexVu Display

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New Toxic Gas Detector Customer Benefits

Fast Response (T50 < 5 sec) Means Increased Safety

Protection in Extreme Climates with Advanced Sensor Humidity and Temperature Compensation

Automatic Calibration with Nonvolatile Memory to Revert to Previous Calibration if Necessary

No Undisclosed Failures due to Internal Diagnostics and Automatic Notification

Reduced Maintenance Costs with quick set-up and easy device interrogation

Det-Tronics NTMOS Shown with FlexVu Display

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Our Mission

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