There are roughly three different methods for the installation of the tuning fork densitometer on-site:
The first method is online installation, utilizing the pressure recovery method to install the densitometer in a flow metering system with orifice plates.
The second method is offline installation. This method is typically used when the metering system employs ultrasonic flow meters.
The third method is also an offline installation, but involves installing the filter within an insulated jacket to further reduce heat exchange between the sample gas pipeline and the surrounding environment.
During the installation and sampling process, the following points should be noted:
Gases are highly sensitive to temperature, and maintaining a constant temperature is essential to meet calibration and usage requirements. The temperature-sensing element on the densimeter should be a calibrated Pt-100 element, which is directly placed in the densimeter's measuring chamber.
To minimize the reaction time, the resistance of the entire pipeline system must be reduced, allowing the gas pressure passing through the instrument to be as close as possible to the pressure at the sampling point.
If the sample gas contains impurities that can contaminate the instrument, an efficient filter should be set up; and attention should be paid to prevent the composition of the sample gas from changing due to temperature drop caused by pressure drop in the sample gas.
4. SampleGasesThe flow rate should be strictly controlled.
5. Compliance with installation and operation requirements for hazardous areas (flammable gases) is mandatory.
6. Online instruments should utilize a retraction-style sampling head, with installation adhering to the regulations of ISO 17051.
7. Be mindful to avoid the impact of noise and pipeline vibration on the vibrator.
8. If the density meter's internal sound tube does not match the pipeline's internal diameterGasesIf the temperature cannot be matched, the difference can be calculated using Equation (4).
ρ l = ρ c td pl Zd (4) tl pd Zl
In the formula: td represents the temperature of the densitometer sensor; tl represents the temperature inside the pipeline; pd represents the pressure of the densitometer (generally considered equal to the pressure at the sampling location on the pipeline); pl represents the pressure at the sampling location on the pipeline; Zd represents the...GasThe compression factor (which can be used for calculations); Zl is the sampling location on the pipelineGasesThe compression factor (which can be used in calculations).
