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IM 50.560CA UA (B/4-03)
DEPOLOX
®
3
PLUS
RESIDUAL ANALYZER
42
3.1.7 Dosing Contact for Chlorine
The chlorine alarm relay 1 can be used to switch-on a pump or solenoid
valve for dosing chlorine.
The relay is energized if “AR 1 Definition” is set to “dosing contact” and
the actual value is < setpoint.
3.1.8 mA Outputs
For each sensor there is an mA current signal output (e.g., for connecting
an additional display). The range fixed at 4...20mA corresponds to the
measuring range. For example, for a Membrane range of 0 to 5 mg/l:
0 mg/l: 4 mA
5 mg/l: 20 mA
The signal that is output corresponds to the measured value. The con-
nected impedance must not be higher than 1000 Ohm. Broken wires or
open mA loops will be detected.
3.2
DEPOLOX 3
plus
- Calibration
3.2.1
Free Chlorine (Bare Electrode) Calibration
When calibrating with the pH compensation option, note that the pH value
must be calibrated or verified first so that the subsequent Cl
2
calibration
is automatically adjusted by the correct pH value.
To achieve this, the prompt “pH correct, yes/no?” appears in the menu.
When confirmed by “Yes,” direct access is granted to chlorine calibration
“Zero Calibration,” below. If answered with “No,” pH calibration fol-
lows.
NOTE: The relays and mA outputs follow the measured values. If
necessary, switch off the alarm relays.
•
Zero Calibration
a. Starting from the basic display press the
F
key until the “CALI-
BRATION” menu is displayed. Press the
▼
key until the “Cl
2
zero” menu is found.
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