Hach pHD Sensor User Manual page 10

Operation
Guidelines for operation
Personal injury hazard. If the pH process electrode breaks, handle the sensor very carefully to prevent injury.
• Before the pH sensor is placed in operation, remove the protective cap to expose the process
electrode and salt bridge. Save the protective cap for future use.
• The process electrode at the pH sensor tip has a glass bulb, which can break. Do not subject this
electrode to abrupt impact or other mechanical abuse.
• For short-term storage (when the sensor is out of the process for more than one hour), fill the
protective cap with pH 4 buffer or distilled water and put the cap back on the sensor. Keep the
process electrode and salt bridge moist to avoid slow response when the sensor is returned to
operation.
• For extended storage, repeat the short-term storage procedure every 2 to 4 weeks, depending on
the environmental conditions.
User navigation
Refer to the controller documentation for keypad description and navigation information.
Configure the sensor
Use the Configure menu to enter identification information and display options for the sensor and to
change options for data handling and storage.
1. Push the MENU key and select Sensor Setup, Configure.
Option
EDIT NAME
SELECT PARAM.
RESET DEFAULTS Sets the configuration menu to the default settings. All sensor information is lost.
Select temperature parameters
1. Select the type of chlorine sensor used - Total CL2 or Free CL2.
2. Select Yes.
3. Select DIFF PH.
4. Select Temperature.
5. Customize the options:
Option Description
SELECT UNITS Sets the units for the temperature measurements-°C (default) or °F.
FILTER Sets a time constant to increase signal stability. The time constant calculates the average
value during a specified time-0 (no effect, default) to 60 seconds (average of signal value
for 60 seconds). The filter increases the time for the sensor signal to respond to actual
changes in the process.
LOG SETUP Sets the time interval for data storage in the data log-10, 30 seconds, 1, 5, 15 (default),
60 minutes.
10 English
C A U T I O N
Description
Changes the name that corresponds to the sensor on the top of the measure screen.
The name is limited to 10 characters in any combination of letters, numbers, spaces or
punctuation. The default name is the serial number of the sensor.
Customizes the options for sensor data handling and storage. Refer to
temperature parameters on page 10 and Select pH parameters
Select
on page 11.