Electro-Chemical Devices (ECD) DCA-23 - Manual (Page 15)

DCA-23 Page 9
Contrast 20 Contrast Adjustment screen
MENU SELECT ▼….. To return to the Home screen
3.2.1.1 Home Screen
The Home Screen displays the calculated Chlorine value and engineering units, Chlorine ppm, the % 4-20
mA output and the temperature.
3.2.1.2 TRO Screen
The TRO Screen displays the TRO mV value used to calculate the displayed chlorine ppm value.
3.2.1.3 TRO Raw Input Screen
The TRO Raw Input Screen displays the actual TRO signal from the sensor on line 1 and the amount of
zero point correction applied on line 2. (Actual TRO + ZP Correction = TRO)
3.2.1.4 TRO Cal 1 Screen
The TRO Calibration 1 Screen is an ENTRY screen. To calibrate the system Enter the TRO mV value that
corresponds to the DPD determined Chlorine value from the calibration chart.
3.2.1.5 TRO Cal2 Screen
The TRO Calibration 2 Screen is an ENTRY screen. This is a slope correction screen, mV/TRO. In all cases
this screen should be set to the default value 1.000 mV/TRO.
3.2.1.6 Chlorine 4-20 mA Screen
The Chlorine 4-20 mA Screen is an ENTRY screen. Set the range of the 4-20 mA output in this screen.
Default is 0.00 ppm – 2.00 ppm = 4-20 mA.
3.2.1.7 Chlorine Alarm Relay Screen (optional)
The Chlorine Alarm Relay screen is an ENTRY screen. This allows the alarm relay to be configured as High
or Low Set Point (ON) and hysteresis value (OFF).
3.2.1.8 Contrast Screen
The Contrast screen allows for the adjustment of the screen contrast.
3.2.2 pH Menus
Screen Displayed Button Pressed
Cl ppm .23
23.6% 12.8°C
Home Screen (view only)
MENU SELECT ▼
pH 7.35
52.5% 12.8°C
pH Screen (view only)
MENU SELECT ▼
Input -20.0 mVa
0 mVa 7.00
pH Raw Input Screen (view only)
MENU SELECT ▼