Becker Digital Natural Gas Positioner Instruction Manual | 81
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DNGP Leak Test Procedure
Explosion Hazard: Do not disconnect equipment unless power has been switched off or the area is
known to be non-hazardous.
1.
Switch DNGP to
Standby
from
Auto
. Observe feedback mA indicator. If position of the valve changes,
continue to step 2.
2.
Move MCV to
Manual
to close the block valve or close the cylinder block valves.
3.
Check the cylinder for decaying or equalizing pressure.
If cylinder pressure is:
• Decaying - check and repair leaks at fittings.
• Equalizing - rebuild the cylinder.
4. Check for external leak at gasket and NPT instrumentation ports:
• If a leak is found - tighten bolts or fittings.
• If no leak is found – check the solenoid valves.
Replacing the Electronic Module of the Programmable
Linear Transmitter
1.
Turn off the power and remove the four connecting wires.
2. Remove the two retaining screws with a 3 mm hex wrench.
3.
Remove the Electronic Module from the housing and shaft .
4.
The new transmitter module can be either 20 mA Down or 20 mA Up depending on the position of Dip
Switch #2 (See Figure 34)
.
To program the transmitter to the:
• 20 mA Down mode (the 20 mA signal is generated at the end of the shaft): Dip
Switch #2 is
down
or
off
.
• 20 mA Up mode (the 20 mA signal is generated close to the body): Dip Switch #2 is
up
or
on
.
5.
Insert the new electronic module back on the transmitter housing, connect the four wires and turn the
power to
On
.
6.
Insert the two screws with hex wrench, connect the wires and power the unit .
