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DOTX-45 Dissolved Oxygen System Part 6 – Configuration

DOTX-45 41 -

If Relay A Mode is set to Alarm Mode, AL, then the following

settings will appear in the Config Menu list automatically. In

this mode, two setpoints can be selected on the same relay,

to create an alarm band. Phase HI selection causes the

relay to energize outside of the band, and Phase LO causes

the relay to energize inside of the band. This feature

enables one relay to be used as a control relay while the

other is used as a HI-LO Alarm relay at the same time.

Setpoint A-LO must be set lower than Setpoint A-HI. When

AL mode is first selected, Setpoint A-LO is defaulted to 0.

Figure 6-4 is a visual description of a typical alarm relay

application.

Figure 6-4 Alarm Relay Example

If Relay B Mode is set to CON, then Relay B will function

identically to Relay A. Relay B settings appear in the

CONFIG menu list automatically.

Setpoint A-HI: 1.000 ppm Setpoint A-LO: .500 ppm

Hyst A-HI: 0.050 Hyst A-LO: .0.050

Delay A-HI: 000 Delay A-LO: 000

When value rises to

≥

1.000 ppm, relay

closes, until value falls back to < 0.950 ppm.

Settings:

When value falls to < 0.500 ppm, relay

closes, until rises back to > 0.550 ppm.

When value rises to

≥

0.500 ppm, relay

closes, until value falls back to < 0.450 ppm.

When value falls to < 1.000 ppm, relay

closes, until rises back to > 1.050 ppm.

*Setpnt A

*Hyst A-HI

*Delay A-HI

*Setpnt A-LO

*Hyst A-LO

*Delay A-LO

*B Setpoint

*B Hysteresis

*B Delay

*B Phasing

}

1.000 ppm

0.950 ppm

0.550 ppm

0.500 ppm

PHASE: HI

HYST - HI

HYST - LO

OFF

}

1.050 ppm

1.000 ppm

0.500 ppm

0.450 ppm

PHASE: LO

OFF

HYST - HI

HYST - LO

OFF

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Dot-x SERIES Spécifications Page 42

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