Option Description
2-Point Calibration (2 PT)
Appropriate for gases with two main constituents. Requires two cal-
ibration gases.
3-Point Calibration (3 PT)
Appropriate for gases with three main constituents. Requires three
calibration gases.
5. Select the number of the calibration that you want to perform.
a. When CAL NUMBR appears, activate Select, then scroll through the list of
options.
b. When the desired option appears, activate Select, then store the selection.
The device can store up to four independent calibrations. All calibrations must have
the same calibration type (2-point or 3-point). Each calibration can use different
calibration gases.
6. Set the low-density calibration point.
a. Connect Calibration Gas Low to the pipework.
b. Set the pressure regulator on the calibration gas to the appropriate sample
pressure for your installation.
c. Open the calibration valve (Valve B) and the exit valve (Valve C).
d. Activate SCROLL until ENTER GAS LOW appears, then activate Select.
e. Enter the specific gravity, molecular weight, or relative density of the calibration
gas and store the value.
f. Activate SCROLL.
g. When CAL GAS LOW appears, activate Select to start the calibration.
h. During the calibration, activate SCROLL to observe the Sensor Time Period and
Stability values during the calibration.
i. Wait a minimum of 15 minutes for the system to stabilize. When Stability is
Good, activate Select.
If measurement does not stabilize after 30 minutes, activate SCROLL to abort the
calibration.
j. Activate Select again to accept the calibration value.
k. As the gas flows, observe the Sensor Time Period and Stability values.
l. Close the calibration valve (Valve B).
m. Disconnect the calibration gas.
7. (3-point calibrations only) Set the mid-range calibration point.
a. Connect Calibration Gas Medium to the pipework.
b. Set the pressure regulator on the calibration gas to the appropriate sample
pressure for your installation.
c. Open the calibration valve (Valve B).
d. Activate SCROLL until ENTER GAS MEDIUM appears, then activate Select.
Purging and calibration
38 Micro Motion
®
Gas Specific Gravity Meters (SGM)
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