- Device: opTim
- Category: Speed of Sound Measurement Unit
- Datasheet: opTim ver 2.0
opTim ver 2.0
Speed of Sound Measurement Unit
OPTIM 2.0 is a very versatile device for precise measurement of speed of sound in gases (air, CO2, N, CH4, other gases and mixtures) as well as other gas properties like: temperature, attenuation, pressure, concentration. All in one low power and compact size device.
OPTIM 2.0 is ready for laboratory: fully configurable manual/automatic modes, raw data upload, RF signal inspection and for industrial purpose: several automatic measurement modes, continuous operation, all measurement results and data from external sensors in one frame.
OPTIM-2.0 is an ultrasonic measuring device designed for precise measurements of the speed of sound in gases. The measurement of the speed of sound is performed using the method of measuring the time of flight of the ultrasonic wave in a system of two transducers (transmission system) placed at a fixed distance from each other, between which the gas is located. The system uses ultrasonic transducers that generate a short 1MHz pulse. Specially selected parameters of the transducer front allow it to be used in an atmosphere of explosive gases (Ex zone) and at the same time ensure optimal parameters for reflecting and receiving the ultrasonic wave in the measuring chamber. The low-noise receiving path of the device with a wide range of adjustable gain ensures obtaining the correct signal level in a wide range of applications (gases with different attenuation coefficient, chambers with different measuring distances). A precise, high-resolution timing system with an adjustable level comparator allows you to achieve stable and repeatable measurements. Advanced algorithms for automatic signal conditioning simplify the preparation of the device for measurement and ensure correct operation despite rapid and large changes in gas parameters during measurements. In addition to measuring the speed of sound, OPTIM-2.0 also allows the integration of many additional sensors that allow the measurement of additional physical parameters used in the assessment of the quality of the gas (or gas mixture). The device allows, among other things, to connect two Pt1000 temperature sensors, two NDIR concentration sensors and one other sensor (e.g. pressure) equipped with a 0-20mA current output or a 0-5V voltage output. OPTIM-2.0 collects and processes all measurement data and makes them available to the master device via the RS232 interface. Communication takes place using a simple and transparent protocol based on short commands written in ASCII code, which allows for easy integration with various devices and measurement systems. Thanks to the extensive possibilities of measurement modes, the device can be successfully used for laboratory measurements, where you can use all the possibilities of manual and automatic operation of the device, as well as for industrial applications requiring maintenance-free and automatic operation in specific configurations
Speed of Sound measurements in gases (laboratory, industrial)
Gas quality measurements
Ultrasound attenuation measurements
Ultrasound ToF and/or thickness measurments with very high resolution
Features & Technical data
Very precise ToF measurement (50ps resolution). Wide range of SoS measurement (up to 1000m/s). hrough transmission mode, 1MHz transducers. Hardware peak detector for amplitude measurements Easy to use ASCII protocol over RS232. RF signal output for diagnostic.
Automatic signal conditioning algorithm
Several configurable meas. modes
Store up to 100 settings sets
Speed of Sound measurement. Measurement principle Time of Flight measurement SoS range 100...1000 [m/s] ToF modes of operation 1st reflection, 1st to 2nd reflection, dual; Peak (level) or zero-cross comparator mode ToF resolution 100 [ps] Distance range 10 to 80 [mm], programmable as parameter
Compact size and low power (1W typ.)
Can be used with various chamber sizes
Pulser Type Single positive pulse, short circuit step pulser Pulse amplitude up to 360 [V] (no load), 256 steps Fall time <40 [ns]. PRF Typ. 750 [Hz], up to 1500 [Hz]. Receiver. Total gain range 100 [dB]. Adjustable gain range 0 to 80 [dB], 0.1dB step. Center frequency 1.0 [MHz]. Bandwidth (-3dB) 700 to 1400 [kHz].
Two channels for PT1000 RTD. Two channels for NDIR sensors. Support for external sensors or signals (4-20mA, 0-5V)
PT1000 channels (Ch1, Ch2)
Measurement principle Resistance ratio measurement (R-C discharge time measurements, on-board reference resistor) Connection 2- or 3-wire. Processing Programmable averaging, offset and gain coefficient. Resolution 0.001 [°C].
NDIR channels (Ch1, Ch2)
Supported type Dynament (Premier series) Interface RS232, 3.3V signaling. Power supply On-board switchable 3.3V regulator, up to 300mA (for both channels).
Resolution 11-bit. Current mode. Sense resistance 270 [Ohm]. Range 0 to 22 [mA]. Voltage mode. Input resistance 100 [kOhm] (minimum). Range 0 to 6.0 [V]. Processing Offset correction, scaling coefficient, averaging
Real-time quality metering of propanated biomethane
Keywords: Calorific value; Wobbe index; biomethane; propanated biomethane; ultrasonic measurement; speed of sound; ultrasound attenuation; correlative method; natural gas; time of flight; gas analysis.
International Journal of Oil, Gas and Coal Technology (Published: 2019)
Keywords: ultrasonic measurement, velocity of sound, speed of sound, natural gas, time of flight, characterization of gas mixture, analysis of gas mixture.
Measurement Automation Monitoring 2016 | Vol. 62, No. 8 | 254--258