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DOTX-45 Dissolved Oxygen System Part 6 – Configuration

DOTX-45 37 -

AC OPERATED UNITS ONLY

*Relay B Mode Relay B can be used in a number of ways: as a setpoint

control, as an alarm, or as the control logic for an automatic

sensor cleaning system. The settings for Relay B Mode are

CON or FAIL. CLn1 and CLn2 are not used with this

instrument.. The first two modes function identically to the

corresponding modes on Relay A.

Temp Units This function sets the display units for temperature

measurement. Press ENTER to initiate user entry mode,

and the entire value will flash. Use the UP arrow key to

modify the desired display value. The choices are °F and

°C. Press ENTER to store the new value.

6.25 Control Menu [CONTROL]

The Control Menu contains all of the output control user settings:

Set 4 mA

Set 20 mA

[Iout1=D.O.] These functions set the main 4 and 20 mA current loop

output points for the transmitter. The units displayed depend

on the selection made in the CONFIG menu for Iout #1

Mode. Also, when the Relay Option Board is installed, the

units will also display #1 or #2 – since there are actually two

analog outputs present in this version.

The value stored for the 4 mA point may be higher or lower

than the value stored for the 20 mA point. The entry values

are limited to values within the range specified in “Set

Range”, and the 4 mA and the 20 mA point must be

separated by at least 1% of this range Use the LEFT arrow

key to select the first digit to be modified. Then use the UP

and LEFT arrow keys to select the desired numerical value.

Press ENTER to store the new value.

Set PID 0%

Set PID 100%

[Iout1=PID] If the PID is enabled, this function sets the minimum and

maximum controller end points. Unlike the standard 4-20

mA output, the controller does not “scale” output values

across the endpoints. Rather, the endpoints determine

where the controller would normally force minimum or

maximum output in an attempt to recover the setpoint (even

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Dot-x SERIES Specifiche Pagina 38