Electro-Chemical Devices (ECD) DCA-23 - Manual (Page 18)

Page 12 DCA-23 Dechlorination Analyzer
3.4 OUTPUTS (4-20 mA Channels)
The DCA-23 has one 4-20 mA output configured for 0-2.00 ppm Chlorine. An optional second 4-20 mA
output for pH is available.
3.4.1 pH Output
Screen Displayed Button Pressed
4mA1 2.00 pH
20mA1 12.00 pH ◄ CALIBRATE ► (enter 4mA line)
4mA1 0.00 pH
20mA1 12.00 pH To adjust the value use the CALIBRATE ◄ or ► to move
cursor. Use the ▲or▼ to adjust the integer value.
4mA1 0.00 pH
20mA1 12.00 pH MENU SELECT ▼ (accept the Value)
4mA1 0.00 pH
20mA1 12.00 pH MENU SELECT ▼
4mA1 0.0 pH
20mA1 12.00 pH ◄ CALIBRATE ► (enter 20mA line)
4mA1 0.0 pH
20mA1 12.00 pH To adjust the value use the CALIBRATE ◄ or ► to move
cursor. Use the ▲or▼ to adjust the integer value.
4mA1 0.0 pH
20mA1 14.00 pH MENU SELECT ▼ (accept the Value)
4mA1 0.0 pH
20mA1 14.00 pH MENU SELECT ▲
(Return to Home Screen)
(4-20 mA1 is set to 0.00 pH to 14.00 pH)
3.4.2 Chlorine Output
Screen Displayed Button Pressed
4mA1 0.00 ppm
20mA1 1.00 ppm ◄ CALIBRATE ► (enter 20 mA line)
4mA1 0.00 ppm
20mA1 2.00 ppm To adjust the value use the CALIBRATE ◄ or ► to move
cursor. Use the ▲or▼ to adjust the integer value.
4mA1 0.00 ppm
20mA1 2.00 ppm MENU SELECT ▼ (accept the Value)
3.4.3 Manual Mode (4-20 mA Hold Function)
The % Output values are displayed on the Home Screen for the Cl ppm output, mA 1, and in the pH
Screen for the optional pH Output, mA 2.
The outputs can be set to manual control by simultaneously pressing both horizontal CALIBRATE keys
when the cursor is in front of the % Output line. An “M” will be displayed in front of the % Output value.
The Output will remain frozen at the last value until the Manual Mode is turned off. The Manual Mode
hold function is commonly used to freeze the outputs during maintenance and calibration cycles. While
in Manual Mode the Output can be adjusted between 0 and 99.9% using the CALIBRATE keys, very
useful for troubleshooting loop communication problems.
To exit Manual Mode press the left CALIBRATE arrow, ◄, three times and the “M” will disappear, the
Output will return to a live reading.