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A.4 Setting Range Values (Local Zero and Span)
Local zero and span
option
ST 3000 Release 300 transmitters are available with optional local zero
and span adjustments. This option is for applications that do not require
an SFC nor digital integration with our TPS system.
About local
adjustments
You must apply equivalent zero and span pressures to make the local
zero and span adjustments. This is similar to setting the LRV and URV
to applied pressures using the SFC.
ATTENTION
After making any adjustments to the smart meter, keep the transmitter
powered for at least 30 seconds so that the new meter configuration is
written to non-volatile memory. If power is turned off before 30
seconds, the changes may not be saved so that when the transmitter
power is restored, the meter configuration will revert to the previous
settings.
Procedure
The procedure in Table A-3 shows the steps for setting the range values
to applied pressures using local zero and span adjustments. See Figure
A-2 for typical local adjustment setup details.
Table A-3 Setting Range Values Using Local Zero and Span
Adjustments
Step Action
1
Turn OFF transmitter power. Loosen end-cap lock and remove end-
cap from terminal block side of electronics housing.
2
Observing polarity, connect a milliammeter across positive (+) and
negative (–) TEST terminals.
ATTENTION
If you have the smart meter with local zero and
span adjustment option, you may use the Smart Meter in place of
the milliammeter.
Continued on next page
54 ST 3000 Release 300 Installation Guide 2/05