Nanotechnology Metal Oxide Semiconductor (NTMOS) H2S Gas Sensor January 2009

New Toxic Gas Detector Functional Flexible Reliable 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

Engineered and Designed for H2S Detection Linear 4-20 mA Output Proportional to 0-100 ppm H2S Explosion-Proof, Stainless Steel Housing Approved for Class 1 Division 1 Hazardous Areas Onboard Humidity Sensor Provides an Accurate Reading in Extreme Climates Automatic Calibration Line Provides Easy One-person Calibration Automatic Fault Diagnostics Indication via Current Output NTMOS Technology Means Higher Sensitivity and Long- lasting Detection Integrated Temperature Sensor for Compensation

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.

New World Standard for Toxic Gas Detection 92.0.01 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 / Linearity 10% of applied gas concentration or 2 ppm 10% of applied gas concentration or 2 ppm * * In accordance with FMID 3033318

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 Storage Tank farms storing crude oil and H2S require continuous monitoring for gas leaks. In addition to the tanks, common leak sources include pipes and valves, which require sensors. Remote Oil / Gas Well Sites Oil and gas well production sites require H2S protection in and around the site. Common monitoring locations include the well heads, flare stacks, and storage tanks. Oil / Gas Drilling Sites Leaks, such as blowouts in oil drilling applications, are subject to releasing large quantities of H2S gas into areas around the site. Typical gas monitoring locations include the driller stand, bell nipple, shale shaker, and mud tank.

Superior H2S Gas Detection Typical 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.

Environmental Effects on Sensor Performance Temperature E-Chem NTMOS Low Med High NTMOS NTMOS NTMOS High E-Chem E-Chem E-Chem No Effect Affects Performance Affects Performance and Sensor Life NTMOS NTMOS NTMOS Humidity Med E-Chem E-Chem E-Chem NTMOS NTMOS NTMOS Low E-Chem E-Chem E-Chem

Comparing Technologies Accuracy Stability Longevity Det-Tronics NTMOS Sensor Metal Oxide Sensor (MOS) Conventional Electrochemical Accuracy in High Temperatures No Yes Longevity in Extreme Climates Accuracy in Humid Air Accuracy in Dry Air Stable Calibration Over Time

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

Nanotechnology MOS = More Surface Area NanoFact 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.

Ordering the NTMOS

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 Points Det-Tronics NTMOS Shown with FlexVu Display

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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