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Operating and maintenance instructions Section 2: Installation and set-up
3-9008-701 Rev J January 2015
Charging the Pneumatic Spring Plenum 21
2.2.4 Charging the Pneumatic Spring Plenum
The pneumatic spring plenum must be charged for proper operation. The prover is shipped
from the factory with an empty spring plenum for safety. Nitrogen is NOT supplied with the
compact prover and must to be acquired locally before meter proving can begin. Calculations
for proper pressure settings of the spring plenum are discussed in Section 3.2.
As an option, the compact prover may be equipped with an automatic plenum adjustment
panel. The panel consists of charge and vent solenoid valves and a pressure transmitter. A typical
panel is shown in Figure 2-5, a connection diagram is shown in Figure 2-6. An operating
computer with the adjustment routine pre-programmed, using an analog input (4-20mA) and
two digital outputs, will be able to automatically adjust the spring plenum pressure before
proving runs begin. See Section 5.4 for troubleshooting these signals.