Post on 16-Jan-2016
transcript
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
Det-Tronics, the DET-TRONICS logo, and FlexVu are registered trademarks or trademarks of Detector Electronics Corporation in the United States, other countries or both. Other company, product, or service names may be trademarks or service marks of others.
Corporate Headquarters, Minneapolis, MN