Hach Chlorine Sensor, User Manual

Page: 11 / 442

Option Description
SELECT
PARAM. Customizes the options for sensor data handling and
storage. Refer to
Select the parameters on page 11.
RESET
DEFAULTS Sets the configuration menu to the default settings. All
sensor information is lost.
Select the parameters
1. Select the type of chlorine sensor used - Total CL2 or Free CL2.
2. Select whether a pH sensor is used - Yes or No.
3. If Yes, select the type of pH sensor used - DIFF PH (pHD) or
COMBO pH (pH combination) and then Chlorine.
4. Customize the sensor parameters:
Option Description
SELECT
UNITS Sets the units for the sensor measurements-Auto ppb-ppm,
Auto ug/L-mg/L, Fixed ppm or Fixed mg/L.
DISPLAY
FORMAT Sets the number of decimal places that are shown on the
measure screen-X.XXX, XX.XX (default), XXX.X or XXXX
(Auto).
SELECT
RANGE Sets the measurement range-0 to 10 ppm.
CAL WATCH Shown if pH sensor is used-refer to Select the Cal Watch
alarm values on page 11.
FILTER Sets a time constant to increase signal stability. The time
constant calculates the average value during a specified
time-0 (filtering disabled) to 60 seconds (average of signal
value for 60 seconds). The filter increases the time for the
sensor signal to respond to changes in the process.
LOG SETUP Sets the time interval for event and data logging for
chlorine concentration and flow status-10, 30 seconds, 1,5,
15 (default), 60 minutes.
Select the Cal Watch alarm values
The Cal Watch menu is used to:
• Set the error and warning alarm conditions for chlorine and/or pH
measurement deviations.
• Set the amount of time a chlorine and/or pH measurement can be
outside the deviation range before an alarm occurs.
• Set the amount of time a chlorine measurement can be 0.5 ppm or
higher before an alarm occurs if the previous chlorine sensor
calibration was done using a process flow with a low chlorine
concentration (LCC) (< 0.5 ppm).
• Set the amount of time a Cal Watch alarm is on before it is canceled
by the instrument if measurements go back in to range.
• Set the percentage rate at which measurements must be outside the
deviation range before an alarm occurs and must be back in range
before an alarm is canceled by the instrument.
To select Cal Watch alarm values:
1. Select Cal Monitor.
2. If the passcode is enabled in the security menu for the controller,
enter the passcode.
3. Select the measurement(s) to monitor (choose one):
Option Description
ALL Enables an error or warning alarm to activate when chlorine
and/or pH measurement deviations occur that are equal to or
higher than the chlorine and pH deviation values selected by
the user.
CL2 ONLY Enables an error or warning alarm to activate when a chlorine
measurement deviation occurs that is equal to or higher than
the chlorine measurement deviation values selected by the
user.
pH ONLY Enables an error or warning alarm to activate when a pH
measurement deviation occurs that is equal to or higher than
the pH measurement deviation values selected by the user.
None Disables all Cal Watch alarms.
English 11