HF scientific CLX Online Residual Chlorine Monitor - Manual (Page 22)

CLX (1/12) Page 17
REV 5.1
Press the  button to continue on and select the desired instrument address using the  or
 buttons. Once the selection is satisfactory, press the  button.
To use the Modbus mode, select ASCII or RTU. Refer to the Modbus Manual available
from HF scientific or online at
www.hfscientific.com .
7.4 Configuring the Alarms
Two relays are provided that are designed to operate as two independent programmable
alarms or as a system problem alarm. Please note that changes to alarms will not be
recognized until the start of the next cycle. Two settings must be selected to fully program
each alarm:
1. The alarm function (HI, LO, OFF or Error)
2. The alarm set point (level at which the alarm activates)
These items are described below:
Alarm Function: The alarms can either be turned OFF or selected to operate in one of
three different manners:
1. HI alarm: the relay changes state when the measured chlorine level is higher than the
programmed alarm level (set point).
2. LO alarm: the relay changes state when the measured chlorine level is lower than the
programmed alarm level (set point).
3. Error alarm: If there is a system fault or problem the alarm will change states.
Alarm Set Point: The level at which an alarm activates is called the alarm set point. On
the instrument, the alarm set point is designated as “S/P”. The set point is adjustable to
any valid chlorine level over the range of the instrument in steps of 0.01 mg/L. This
setting is not available if the Error function is chosen
7.4.1 Alarm 1
Alarm 1 Function: The ALM1 is displayed and the display indicates the current
function of alarm 1 (HI, LO, OFF, or Error). Use the  or  buttons to cycle
through and select the desired function. Press the  button to accept the selection.
If the alarm was turned OFF, a prompt will appear to set up alarm 2 (go to section
7.4.2).