ENGLISH
15
The chlorine measurement
CL
works according to the corresponding values relating to the selected chlorine range indicating the
value in Cl ppm.
ADVANTAGES: the proportional function is more accurate than the ON-OFF mode.
DISADVANTAGES: the user needs to be a professional in order to select the most accurate settings to assure the best results.
A N A L O G U E O U T P U T S I N C U R R E N T 4 -20 m A 1 / 4 -20 m A 2
The instrument features 2 outputs with signal in current in mA. The 4-20 mA signal follows the pH or
RX mV
and CL (ppm) settings
previously selected. The mA output provides two operating modes to be selected according to the system requirements:
�
mA DEVICE:
this is a programmable function combined with the unit of measure of the pH or RX and CL measurement in real time which
makes it therefore possible to remotely monitor devices such as data loggers, PLCs, recorders or other devices suited to processing remote
signals in mA.
Value 4 mA
corresponds to the minimum programmed pH or RX mV or CL (ppm) value,
20 mA
corresponds to the maximum measurable
pH or mV and CL value, the connected equipment will operate accordingly.
�
METERING ON SETPOINT:
mA outputs control metering pumps suited to processing an input mA signal.
4 mA
corresponds to the minimum pH or RX mV and CL (ppm) value, hence the connected metering pumps will work at their minimum
capacity.
20 mA
corresponds to the maximum measured pH or RX mV or CL value hence the connected metering pump will work at its
maximum programmed capacity (according to the settings of the device and of the metering pump).
ADVANTAGES: best possible results because the pulses are extremely accurate in relation to measured levels.
DISADVANTAGES: the user requires a specific metering pump or other device suited to processing a remote signal in mA.
O V E R D O S E TI M E
With the
overdose time
alarm one can select a period during which the setpoint must be reached. If the setpoint is not reached
during this period of time, the instrument blocks output operations, including those in mA (metering pumps), the alarm is displayed as ON
and triggers a signalling instrument if it is connected to the alarm relay.
ADVANTAGES: preventing excessive doses of chemicals.
M A X I M UM M E T E R I NG TIM E
The
maximum metering time
is an extra function that ensures that metering operations are completed within a certain time limit
selected by the operator. The relays connected to the metering pumps activate accordingly. This function makes it possible to eliminate time
limits, to meter continuously based on the selected setpoints or, if the operator wishes to change the settings, to choose a given period (up to
999 minutes) within the selected hours.
ADVANTAGES: preventing excessive addition of chemical product not only according to the setpoint, but also cancelling any form of
programming of the instrument’s setpoint.
TI M E R I N R E A L TI M E / S T A R T -S T O P T IM E
The
Timer in real time
makes it possible to control through a timer the AUX outputs for each remote device for the period selected in
the program. The operator may also program the days of activity and the exact time of the unit’s operations through the Start/Stop
programming.
A U X O U T P U T S
The two AUX auxiliary outputs control various functions connected to any type of remote On-Off device controlled by a timer in real
time. Each output may control a device or appliance thanks to very accurate programming of minutes/hours/days/weeks.
ADVANTAGES: this function makes this instrument a very versatile control unit not only to measure chemical physical parameters but also for
other functions connected to the system where it is installed.
S T A R T -U P D E L A Y
The
start-up delay
blocks the output relays when the unit is switched on, thus allowing the sensor to polarise assuring correct
measurements (programmable).
FLO W S E N SO R functi on “Proxi m i ty Sensor”
Flow Sensor (not included):
if there is no water flow in the probe socket (and possibly in the system), the flow sensor (proximity
sensor) disables all outputs ensuring no chemical substance is added.