Hach LXV526.98.2011A Betriebsanleitung Seite 21

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 Selects the menu options that are passcode protected. The menu options that are
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.
1. Wait until the overflow vessel is full of water.
2. If the water is higher than the top mark (+) or lower than the bottom mark (–) on the overflow
vessel, do the steps that follow:
a. Push menu, then select SETUP SYSTEM > CONFIGURE ANALYZER > OVERFLOW
COMPENSATION.
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).
selected are passcode protected. Push the LEFT arrow to select or unselect a
checkbox.
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