Teledyne 4220 installation and operation guide Output Range

4220 Flow Meter

Section 2 Programming

occurs, return to the 4 - 2 - 0 option, and at the prompt enter 0 for the number of outputs activated. This will restore the exter- nal 4-20 mA converter capability.

MANUAL CONTROL will appear if you continue moving to the right. “RANGE” will appear with the ANALOG OUTPUT menu if the optional internal 4-20 mA converter is present in the flow meter. If you select RANGE, the following will appear:

OUTPUT RANGE

• 0 - 20 mA • • 4-20 mA •

This menu lets you select the current value for zero-percent (baseline) compatible with your equipment (internal 4-20 mA board only).

If you select SMOOTHING from the ANALOG OUTPUT menu the following will appear:

SMOOTHING

• NONE • • 15 SEC • • 30 SEC • • 1 MIN •

The SMOOTHING option lets you stabilize operation of the outputs by preventing a rapid reaction to sudden sharp changes in the condition being monitored that quickly return to normal (transients). Selection of a smoothing interval will prevent the equipment controlled by the 4-20 mA loop from reacting too quickly, too much, or operating erratically. A low-pass filter algo- rithm is incorporated in the software.

If you select the MANUAL CONTROL option from the ANALOG OUTPUT menu the following will appear:

MANUAL CONTROL (OUTPUT 0 = EXTERNAL)

OUTPUT 0 = 0.0 MA

This option lets you control the operation of a 4-20 mA loop to check the operation of equipment controlled by the loop at any level from 0 to 100%. After connecting a 4-20 mA output to a con- trolled device, you can program the flow meter to put a specified current on a specific analog output. If you are using the external 4-20 mA converter, the Analog Output number will be zero.

Note

Selecting the MANUAL CONTROL option and programming any one of the ports will prevent the values transmitted by the other active 4-20 mA ports from being updated until the test is completed. The other ports will continue to transmit whatever value they held at the start of the test. Exiting from the MAN- UAL CONTROL menu at the end of the test will return all active 4-20 mA ports to normal operation.

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