7
SETUP
The instrument shows:
1a) ->OFF
1.00Cl
Pressing twice “RIGHT” key the display will show:
1b) ->ON
0.00Cl
“1a)” and “1b)” are working range values. Every range is set by a value that operates relay output. Using
default values, the setpoint 1 will drive a pump that will increase the conductivity value. The pump will
switch off for Cl minor than 1.00 Cl and switch on when reaches 0,00 Cl: this is the ON/OFF working
mode. The difference between the two Cl (1.00 and 0.00) is called HYSTERESIS.
To avoid damaging the relay do not set Hysteresis under 0.20Cl.
PROPORTIONAL mode. The output relay is modulated (ON/OFF) depending on Cl values set in 1a)
and 1b). Ex.: Proportional mode between 1.00Cl (0%) and 0.50Cl (100%). In this way the relay will be
on for values between 0.00Cl and 0.50Cl, it will be on for values higher than 1.00Cl. For values between
1.00Cl and 0.50Cl the relay will be on or off depending on calculated percentage.
The calculation is based on a 100 seconds time. If Cl reaches 0.60Cl the relay will be on for 80 seconds
and off for 20 seconds. To set the PROPORTIONAL functioning mode substitute percentual value to
“ON” and “OFF”.
It is not possible to enter mixed values (ex.: 100% for SP1 and ON for SP2). In this case it will not
possible save them.
In proportional mode the instrument doesn’t show % values for setpoints status but only if they
are on or off.
It is possible modify setpoint status (on,off, %) and setpoint values with RIGHT key on the function to
modify and using “UP” and “DOWN” key to change the value. Enter the value and save by pressing
“E” to save.
Repeat sequence for setpoint 2 (OUT2).
Press “E” key to exit from setpoint setting. The display will show “SetPoint Saved” and it return
to the previous menu.
Out mA
This function allows to program the current output for driving a metering pump or a chart recorder.It is
possible to program in 0
÷
20mA mode or 4
÷
20mA mode in the working range between 0 and 9.99ppm.
The current output and the working range may be modified. Ex.: it is possible to set 4mA at 9.99ppm
and 20mA at 0ppm. In this case, if you connect a metering pump it will dose at the maximum flow at
0ppm. The pump will reduce the flow when Cl decrease and it will stop at 9.99ppm. If you connect a
chart recorder, a graphic curve will be printed. Set minimum current value to 0ppm and maximum current
value to 9.99ppm. Use “UP” and “DOWN” keys to change these settings. Press “RIGHT” key to scroll
through the options. Press “E” to confirm.
