Electro-Chemical Devices (ECD) DCA-23 - Manual (Page 19)

DCA-23 Page 13
3.5 ALARM RELAYS
The DCA-23 has an option of two alarm relays. Relay 1 is set as an alarm on PV1 the Chlorine channel.
Relay 2 is set for an alarm on the pH channel. The relays can be wired as NO, Normally Open or NC,
Normally Closed. The default configuration assumes NO status.
3.5.1 Chlorine Alarm Relay
Screen Displayed Button Pressed
1 On > .0 ppm
1 Off < .0 ppm ◄ CALIBRATE ► (enter Relay Set Point)
1 On > .0 ppm
1 Off < .0 ppm To adjust the value use the CALIBRATE ◄ or ► to move
cursor. Use the ▲or▼ to adjust the integer value.
1 On > 2.00 ppm
1 Off < .0 ppm MENU SELECT ▼ (accept the Value)
1 On > 2.00 ppm
1 Off < .0 ppm MENU SELECT ▼
1 On > 2.00 ppm
1 Off < .0 ppm ◄ CALIBRATE ► (enter Relay Hysteresis Point)
1 On > 2.00 ppm
1 Off < .0 ppm To adjust the value use the CALIBRATE ◄ or ► to move
cursor. Use the ▲or▼ to adjust the integer value.
1 On < 2.00 ppm
1 Off > 1.75 ppm MENU SELECT ▼ (accept the Value) ** Whether the relay is
a High or Low Alarm is determined by the Off value **
1 On > 2.00 ppm (High Alarm
1 Off < 1.75 ppm example)
1 On < 1.00 ppm (Low Alarm
1 Off > 1.15 ppm example) MENU SELECT ▼ (If the Off value is below the set point
then the relay will be a High Alarm, closing at 2.00 ppm and
re-opening below 1.75 ppm. If the Off is above the set point
the relay will switch to a Low Alarm.)
3.5.2 pH Alarm Relay
Screen Displayed Button Pressed
1 On > .0 pH
1 Off < .0 pH ◄ CALIBRATE ► (enter Relay Set Point)
1 On > .0 pH
1 Off < .0 pH To adjust the value use the CALIBRATE ◄ or ► to move
cursor. Use the ▲or▼ to adjust the integer value.
1 On > 8.50 pH
1 Off < .0 pH MENU SELECT ▼ (accept the Value)
1 On > 8.50 pH
1 Off < .0 pH MENU SELECT ▼
1 On > 8.50 pH
1 Off < .0 pH ◄ CALIBRATE ► (enter Relay Hysteresis Point)
1 On > 8.50 pH
1 Off < .0 pH To adjust the value use the CALIBRATE ◄ or ► to move
cursor. Use the ▲or▼ to adjust the integer value.
1 On < 8.50 pH
1 Off > 8.45 pH MENU SELECT ▼ (accept the Value) ** Whether the relay is
a High or Low Alarm is determined by the Off value **
1 On > 8.50 pH (High Alarm
1 Off < 8.45 pH example)
1 On < 1.00 pH (Low Alarm
1 Off > 1.15 pH example) MENU SELECT ▼ (If the Off value is below the set point
then the relay will be a High Alarm, closing at 8.50 pH and
re-opening below 8.45 pH. If the Off is above the set point
the relay will switch to a Low Alarm.)