Glossary

If you have any questions about the below glossary, please contact orders@mems-iss.com.

Advanced Density Function

The Advanced Density Function option provides internal firmware that will calculate additional density parameters to increase the usefulness of the instrument. These two functions are Reference Density and Concentration Calculation.

Reference Density

LDM
All liquids expand with an increase in temperature if the pressure is not allowed to increase freely. This will decrease the density. The volume will increase but the mass will be the same. By recalculating the density to a reference fixed temperature it can be easily compared independently of temperature. The MassSense™ can make this calculation based on the expansion coefficient of the fluid in the meter. The expansion coefficient can be programmed by the user for any fluid. These coefficients can be either linear or second order non-linear.

GDM
All gasses expand with an increase in temperature which means the density decreases. Increasing pressure increases the density. The Reference Density function of the MassSense™ can recalculate the density to a standard temperature and pressure and will be independent of the temperature and pressure.

Concentration Calculation

LDM
The density of a binary liquid varies with concentration and also with temperature. The MassSense™ LDM has the ability to calculate and display the concentration of this binary liquid (one liquid or dissolved solid in another liquid). Coefficients must be calculated and programmed into the instrument and the measured fluid must be well defined with a known density — concentration — temperature relationship.

GDM
The density of a binary gas varies with concentration, pressure and also with temperature. The MassSense™ GDM has the ability to calculate and display the concentration of this binary gas (one gas in another gas). Coefficients must be calculated and programmed into the instrument and the measured gas must be well defined with a known density —concentration — temperature —pressure relationship.

Flow Switch

LDM
A flow sensor with programmable alarm function to alert of low flow conditions.

Temperature Sensor Ports

LDM
Used for the correction of density to a remote temperature – requires the Advanced Density function.

Hazardous Location

GDM
Hazardous Location for explosive gasses by way of Intrinsic Safety. RS232 or RS485 only.

LDM
Hazardous Location for explosive gasses by way of Intrinsic Safety. RS232 or RS485 only.

Approvals

GDM
CE 0539 Ex II 1G Ex ia IIC T4 -20°C < = Ta < = +60°C
Ex ia IIC T4 Ga -20°C < = Ta < = +60°C
UL CL. I DIV. 1 Group ABCD T4 -20°C < = Ta < = +60°C
Class I, Zone 0, AEx ia IIC T4 20°C < = Ta < = +60°C
EMC EN 61326-1:2006

LDM
CE 0539 Ex II 1G Ex ia IIC T4 -20°C < = Ta < = +60°C
Ex ia IIC T4 Ga -20°C < = Ta < = +60°C
UL CL. I DIV. 1 Group ABCD T4 -20°C < = Ta < = +60°C
Class I, Zone 0, AEx ia IIC T4 20°C < = Ta < = +60°C
EMC EN 61326-1:2006