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Installation Procedure 3098 Technical Manual
2-4
2.6 Set-up procedure - Purge Cycling and Calibration
IMPORTANT NOTICE
The pressure relief valve has been factory set for the unit to conform to the Pressure Equipment Directive.
UNDER NO CIRCUMSTANCES SHOULD THIS SETTING BE CHANGED.
For further information, contact the factory using the details on the back page.
Gas
Line
ISOLATION
VALVE, D
VALVE A
VALVE B
VENT AND INPUT
FOR CALIBRATION
GASES
VALVE C
DIAPHRAGM
PRESSURE
REGULATOR
FILTER
PRESSURE
RELIEF VALVE
OUTLET
DENSITY
METER
INSULATING
COVER
REFERENCE
CHAMBER
PRESSURE
CONTROL VALVE
CONTROL
PRESSURE
INDICATOR
TO VENT
INPUT
ORIFICE
OUTPUT
ORIFICE
TO SIGNAL
CONVERTER
3098
CHAMBER FILLING
VALVE, E
VALVE F
(PURGING VALVE)
Figure 2-1: Schematic diagram of a typical 3098 Specific Gravity Measuring System
The procedure for purging and calibrating the 3098 is given below:
1. Ensure isolation valve (D) is closed.
2. Ensure valve (A) is closed.
3. Ensure valve (B) is closed.
4. Ensure valve (F) is closed.
5. Open valve (C).
6. Open chamber filling valve (E).
7. Set the pressure regulator to the required value - i.e. the actual working pressure of the system.
8. Open isolation valve (D).
9. Open valve (A) and allow gas to flow for 3 minutes.