PT.
WIFGASINDO DINAMIKA INSTRUMENT ENGINEERING
(www.wifgas.com)
BASIC SENSING
DETECTION
4/23/2021
PT. WIFGASINDO DINAMIKA INSTRUMENT ENGINEERING
(www.wifgas.com)
Fire & Gas Sensing Measurement
Refer To
Basic 3-Angle Fire
4/23/2021
Flame & Gas Caracter
• Heat / Energy / Flame
Character
- Convection
- Conduction
- Radiation
- Absorbed / Reflected
• Smoke Character
- Absorber / Reflector
• Fuel / Gas Character
- Combustible
- Toxic
- Corrosive
- Absorber / Reflector
- Noise Leaked
4/23/2021
Thermal Fire Sensing Measurement
Convection / Direct Thermal Sensor
Fusible Plug / Fusible PVC Tube
• Melted Temperature Set Point Alarm
Bi-Metal Thermal Sensor
• Contact Temperature Set Point Alarm
Line Heat Sensor (Dual Parallel Filament / Coaxial Filament)
• Melted Temperature Set Point Alarm
Closed Sprinkle Sensor
• Glass Broken Temperature Set Point Alarm
4/23/2021
Thermal Fire Sensing Measurement
Conduction Thermal Sensor
Thermocouple Sensor
• Voltage Temperature Set Point Alarm
Thermal Resistor (Thermistor) Sensor
• Current Temperature Set Point Alarm
4/23/2021
Optical Fire Sensing Measurement
Intensity Light Spectrum Sensor
Optical Flame Sensor
• Light Intensity Set Point Alarm
Light Absorber/Reflection Sensor
Photoelectric Smoke Sensor
• Absorb/Reflection Value Set Point Alarm
High Sensitivity Photoelectric Smoke Sensor (HSSD)
• Absorb/Reflection Value Set Point Alarm
4/23/2021
Ionized Fire Sensing Measurement
Radioactive Reaction Smoke Sensor
Ionized Smoke Sensor
• Ion Reaction Set Point Alarm
4/23/2021
Gas Sensing Measurement
Catalytic Gas Sensor
Wheatstone Bridge Technology
• Dual Filament Catalyst Sensing & Reference
• Deviation Current Measurement
Toxic Gas Sensor
Wheatstone Bridge Technology
• Dual Filament Chemical Sensing & Reference
• Deviation Current Measurement
4/23/2021
Gas Sensing Measurement
Corrosive Gas Sensor
Wheatstone Bridge Technology
• Dual Filament Metal Oxide Sensing & Reference
• Deviation Current Measurement
Noise Rejection Leak Gas Sensor
Multiband Ultrasonic Receiver Analyzer
• Selectable Multiband Frequency Ultrasonic
• Selectable Multiband Amplitude Ultrasonic
4/23/2021
Gas Sensing Measurement
Optical Gas Sensor
Optical Reflection Transmission Technology
• Short Reflection Mirror
• Dual Spectrum Light (Absorb & Un-Absorb)
• Deviation Absorb & Un-Absorb Measurement
Optical Direct Transmission (Tx & Rx Splitter)
• Dual Spectrum Light (Absorb & Un-Absorb)
• Deviation Absorb & Un-Absorb Measurement
4/23/2021
Gas Sensing Measurement
Combustible Gas Sensor
Catalyst resistor material
Toxic Gas Sensor
Chemical resistor material
Corrosive Gas Sensor
Metal Oxide resistor material
4/23/2021
Optical Gas Sensing Measurement
Optical Gas Sensor
Dual Spectrum Analyzer
4/23/2021
Optical Gas Sensing Measurement
Optical Line Of Sight Gas Sensor (Open Path)
10 - 60 m
Optical Beamsplitter
Measurement
Signal Detector
Flammable
hydrocarbon
IR Source
gas Optical Filters
Microprocessor
and
Electronics
Reference
Signal Detector
Gas
Concentration
(LEL)
4/23/2021
Optical Gas Sensing Measurement
Optical Point Single Gas Sensor (PIRECL)
4/23/2021
Optical Gas Sensing Measurement
Optical Point Multi Gas Sensor (GAS ANALYZER)
4/23/2021
Gas Sensing Measurement
Gas Limit Flammable Level
Upper Flammable/Explosion Level (UFL/UEL)
• The maximum concentration of a gas or vapor mix in air that will
burn
• Upper this concentration the mixture will not burn (“Too Rich”)
• Expressed as a percentage of gas in air
Lower Flammable/Explosion Level (LFL/LEL)
• The minimum concentration of a gas or vapor mix in air that will
burn
• Bellow this concentration the mixture will not burn (“Too Lean”)
• Expressed as a percentage of gas in air
4/23/2021
Gas Sensing Measurement
Gas Limit Flammable Level
4/23/2021
Ultra Sonic Gas Sensing
Measurement
Noise Rejection Leak Gas Sensor
Wide Band Ultrasonic Receiver
Multi Analyzer Ultrasonic Receiver
139 dB
Audible Ultrasonic
Frequency Frequency
Range Range
40 dB
20 Hz 20 kHz 80 kHz
4/23/2021
