A.4 Setting Range Values (Local Zero and Span)

Local zero and span option

About local adjustments

ATTENTION

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.

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.

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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ST 3000 Release 300 Installation Guide

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