7
SETUP
The instrument shows:
1a) ->OFF
1100uS
Pressing twice “RIGHT” key the display will show:
1b) ->ON
1000uS
“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 on for uS values minor than 1000uS and switch off when reaches 1100uS:
this is the
ON/OFF working mode.
The difference between the two uS (1100 e 1000) is called HYSTERESIS.
To avoid damaging the relay do not set Hysteresis under 100uS.
PROPORTIONAL mode
. The output relay is modulated (ON/OFF) depending on uS values set in 1a)
and 1b). Ex.: Proportional mode between 1100uS (0%) and 1000uS (100%). In this way the relay will
be on for values between 0 and 1000uS, it will be on for values higher than 1100uS. For values
between 1000uS and 1100uS the relay will be on or off depending on calculated percentage.
The calculation is based on a 100 seconds time. If Conductivity reaches 1030uS the relay will be on
for 70 seconds and off for 30 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 2000uS.
The current output and the working range may be modified. Ex.: it is possible to set 4mA at 0uS and
20mA at 1000uS. In this case, if you connect a metering pump it will dose at the maximum flow at 0uS.
The pump will reduce the flow when Conductivity decrease and it will stop at 1000uS. If you connect
a chart recorder, a graphic curve will be printed. Use “UP” and “DOWN” keys to change these settings.
Press “RIGHT” key to scroll through the options. Press “E” to confirm.
