Hach Polymetron Series, User Manual, Page: 15 / 456

Reset calibration options
The calibration options can be reset to the factory default options.
1. Push the MENU key and select Sensor Setup, [Select Sensor],
Calibrate, Reset Default Cal.
2. If the passcode is enabled in the security menu for the controller,
enter the passcode.
3. Push ENTER . The Reset Cal? screen is shown.
4. Push ENTER . All calibration options are set to the default values.
5. If the option for operator ID is set to Yes in the Calibration Options
menu, enter an operator ID. Refer to
Change calibration options
on page 14.
6. On the New Sensor screen, select whether the sensor is new:
Option Description
Yes The sensor was not calibrated previously with this controller. The
days of operation and previous calibration curves for the sensor are
reset.
No The sensor was calibrated previously with this controller.
7. Push the BACK key to return to the measure screen.
Modbus registers
A list of Modbus registers is available for network communication. Refer
to the manufacturer's website for more information.
Maintenance
D A N G E R
Multiple hazards. Only qualified personnel must conduct the tasks
described in this section of the document.
Clean the sensor
W A R N I N G
Chemical exposure hazard. Obey laboratory safety procedures and
wear all of the personal protective equipment appropriate to the
chemicals that are handled. Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
W A R N I N G
Personal injury hazard. Removal of a sensor from a pressurized vessel can be
dangerous. Installation and removal of these sensors should be done by
individuals trained in proper high pressure and temperature installation. Always
use industry approved hardware and safety procedures when dealing with high
pressure and/or temperature fluid transport systems.
Pre-requisite: Prepare a mild soap solution with warm water and
dishwashing detergent, Borax hand soap or a similar soap.
Examine the sensor periodically for debris and deposits. Clean the
sensor when there is a buildup of deposits or when performance has
degraded.
1. Use a clean, soft cloth to remove loose debris from the end of the
sensor. Rinse the sensor with clean, warm water.
2. Soak the sensor for 2 to 3 minutes in the soap solution.
3. Use a soft bristle brush to scrub the entire measuring end of the
sensor.
4. If debris remains, soak the measuring end of the sensor in a dilute
acid solution such as < 5% HCl for a maximum of 5 minutes.
5. Rinse the sensor with water and then return to the soap solution for
2 to 3 minutes.
6. Rinse the sensor with clean water.
Always calibrate the sensor after maintenance procedures are done.
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