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DOTX-45 Dissolved Oxygen System Part 6 – Configuration

DOTX-45 40 -

delay setting for the controller. The entry value is limited to a

value between 0 and 999 seconds. Press ENTER to initiate

user entry mode, and the value will flash. Use arrow keys to

modify value; range is 0 to 999 seconds. Press ENTER to

store the new value.

*A Phasing This function establishes the direction of the relay trip.

When phase is HI, the relay operates in a direct mode.

Therefore, the relay energizes and the LCD indicator

illuminates when the oxygen value exceeds the setpoint.

When the phase is LO, the relay energizes and the LCD

indicator illuminates when the oxygen level drops below the

setpoint. The failsafe setting does have an impact on this

logic. The description here assumes the failsafe setting is

OFF. Press ENTER to initiate user entry mode, and the

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

desired value; selections include HI for direct operation or

LO for reverse operation. Press ENTER to store the new

value.

See Figure 6-3 below for a visual description of a typical

control relay application.

Figure 6-3 Control Relay Example, Hysteresis and Two opposite Phase Options

NOTE: If the temperature units are changed between °

and °

F (see Temp Units in this section), the default

setting for this output will change between 100 °

and 212 °F accordingly.

Setpoint: 1.000 ppm

Hyst: 0.050

Delay: 000

Failsafe: OFF

When value rises to ≥ 1.000 ppm, relay closes.

When value falls to ≤ 0.950 ppm, relay opens.

When value rises to

≥

1.050

ppm

, relay opens.

When value falls to ≤ 1.000 ppm, relay closes.

Settings:

}

1.000 ppm

0.950 ppm

PHASE: HI

HYSTERESIS

“DEAD BAND”

OFF

}

1.050 ppm

1.000 ppm

PHASE: LO

OFF

HYSTERESIS

“DEAD BAND”

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