Figure 5-1: Examples of cylinders with pressure regulators, hoses, and compression fittings
Data entry for gas calibration
During calibration, you will be required to enter data for each calibration gas:
•
If the SGM is operating as a specific gravity meter, you must enter the specific gravity of the gas.
During calibration, you must be able to flow each calibration gas through the meter in the order of their
specific gravity, lowest to highest.
•
If the SGM is operating as a relative density meter, you must enter the relative density of the calibration
gas.
•
If the SGM is operating as a molecular weight meter, you must enter the molecular weight of the gas.
5.2.4 Pressure
A meter with the sampling conditioning system includes a pressure regulator with indicator that:
•
Controls the inlet sample pressure
•
Allows you to verify sample pressure
Note
All SGM models come with an included pressure gauge that identifies only the reference chamber pressure
that is used for pressure and compressibility compensation.
For SGM models without the sampling conditioning system, a pressure regulator with indicator must be
installed by the customer.
The pressure in the system must meet the following requirements:
•
The maximum sample inlet pressure (the pressure regulator with gauge in
models should not exceed:
SGM model
Pressure rating
SGM2, SGM3 (without pressure regulator)
122 psia (8.41 bara)
SGM4 (with pressure regulator)
1,450 psia (100 bara)
•
Reference chamber maximum pressure: 101 psia (6.96 bara)
Configuration and Use Manual
Purging and calibration
MMI-20020954
March 2021
Configuration and Use Manual
29
