ENGLISH
13
ESELECT M1 PH(RX)
Control Panel
The following picture shows the control panel with a description of the functions of the various keys.
1
Button to scroll the menu to the
left and decrease values
2
Button to quit the menu
3
Button to enter the menu and
confirm selections
4
Button to scroll the menu to the
right and increase values
5 Display
Fig. 4 – Keypad
OPERATING FUNCTIONS
ON-OFF mode
The unit has an ON-OFF mode which switches on (or off if the REVERSE mode is ON) the output relays to of the metering
pumps, peristaltic pumps or other equipment.
ADVANTAGES: it works with the great majority of ON-OFF devices, which are also cost-effective.
DISADVANTAGES: due to the high output frequency, there may be slightly different values, between the real measurement in the
system and that shown by the instrument on the display (please note that other factors may affect real measurements, such as: chemical
concentration, distance between the injection point and the system and other factors).
DIRECT / REVERSE direction
The setpoint relays are factory set as follows:
Setpoint 1 PH: ACID mode, the output is active when the measured value is higher than the selected setpoint, the connected pump
meters out an acid product.
Setpoint 2 PH: ALKALINE mode, the output is active when the measured value is lower than the selected setpoint, the
connected pump meters out an alkaline product.
Setpoint 1 RX: DIRECT mode, the output is active when the measured value is lower than the selected setpoint, the connected
pump meters out chlorine (Oxidising product).
Setpoint 2 RX: REVERSE mode, the output is active when the measured value is higher than the selected setpoint, the
connected pump meters out a product reducing the chlorine value.
MIN / MAX ALARM function
The Alarm function makes it possible to select the minimum and maximum values outside which the instrument triggers an alarm.
ADVANTAGES: increasing safety measures assuring an alert if the parameters are out of control.
HYSTERESIS
Hysteresis is useful during operations to adjust the setpoints in ON-OFF mode and is used to enable or disable the output relays
when the selected hysteresis is achieved. Hysteresis is useful when there are too many quick swings around the setpoint, that might damage
the connected device. By increasing hysteresis it is possible to move away from the setpoint value in accordance with the required value.
