Hach NA5600 sc Na+ Mode D'emploi page 22

4.17.1 Reset the overfeed timer for relays
The overfeed timer setting for the relays prevents a condition that keeps the measurement value
higher than the setpoint or deadband setting (e.g., damaged electrode or a process upset) from
keeping a relay switched on continuously. The overfeed timer limits how long the relays and their
connected control element stay on independent of the conditions.
When the select time interval for the overfeed timer expires, the relay status flashes on the top-right
corner of the measurement screen until the overfeed timer is reset. Push diag, then select
OVERFEED RESET to reset the overfeed timer.
4.18 Set the error hold mode
If an analog output or relay in the analyzer is connected to an external device, select the error hold
mode.
1. Push menu, then select SETUP SYSTEM > CONFIGURE ANALYZER > SETUP OUTPUTS >
ERROR HOLD MODE.
2. Select an option.
Option
HOLD OUTPUTS
(default)
TRANSFER
OUTPUTS
4.19 Set the security settings
Enable passcode protection as necessary. Select the menu options that are passcode protected.
Note: Passcode protection is disabled by default.
1. Push menu, then select SETUP SYSTEM > CONFIGURE ANALYZER > SECURITY SETUP.
2. Select an option.
Option
SET PASS CODE
EDIT PASS CODE
PROTECT
FEATURES
4.20 Adjust the water level of the overflow vessel
Note: Only do this task if the analyzer has a calibration bottle. Refer to Product overview in the installation manual
to identify the calibration bottle.
The water level of the overflow vessel is important for accurate auto calibration. Before an auto
calibration is done, adjust the water level so that the water is between the top mark (+) and the
bottom mark (–). Make sure that the analyzer is level from front to back and side to side.
22 English
Description
Holds the relays and analog outputs at the last known value when an
error occurs or measurements are stopped (e.g., calibration, rinse,
reactivation or grab sample measurement).
Sets the relays and analog outputs to the transfer value set in the analog
output and relay settings when an error occurs or measurements are
stopped (e.g., calibration, rinse, reactivation or grab sample
measurement).
Description
DISABLED (default)—Sets the passcode protection to off. ENABLED
—Sets the passcode protection to on. Enter the default passcode
(HACH55).
Changes the passcode (6 characters maximum).
Selects the menu options that are passcode protected. The menu
options that are selected are passcode protected. Push the LEFT
arrow to select or unselect a checkbox.