Delta HD2105.1, Operating Manual

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HD2105
- 10 -
V2.3
The instrument has an Auto-Hold function, which can be set in the MENU, that “freezes” the meas-
urement automatically when it has been stable (
within 1 mV ) for over 10 seconds: the message
HOLD is displayed.
To perform a new measurement, it is necessary to press the pH/mV key.
The HOLD message starts blinking, while the display follows the actual measurement trend, until it
stabilizes again and the HOLD message remains still.
NOTE : when the Auto-Hold function is enabled, the pH/mV key allows the pH measurement to be
relaunched, and the measurement in mV is disabled. To restore the display in mV, disable the
Auto-Hold function in the menu.
In the menu, the key clears or cancels the active function (ESC).
REL/ key
In measurement mode, displays for both measurements –
mV and temperature – the difference
between the current value and that measured on pressing the key. The REL message appears on
the display; press the key again to return to the current measurement.
When used in the menu, it decreases the current variable value.
MENU Key
Upon turning on the instrument, the
AutoPowerOff function can be disabled by holding the MENU
key down (please see the ON-OFF key description).
The first menu item is accessed by initially pressing on the MENU key; press ENTER to go to the
following items. To modify the item displayed, use the arrow keys (
and ). The current value is
confirmed by pressing the ENTER key and the display moves on to the next parameter. If pressing
ESC the setting is cancelled.
To exit the menu, press the MENU key at any time.
The menu items are listed in this order:
1) Management of memorized data (only HD2105.2) : the message “ LOG_DUMP_or_E-
RAS ” (Transfer data or erase) is scrolled in the comment line. The center figure reports
the number of free memory pages (FREE). All memory data are permanently erased by
pressing SERIAL/EraseLOG. By pressing LOG/DumpLOG, the data transfer of the logged
data on the serial port is started: the “BAUD-RATE” must have previously been set to the
maximum value (please see the menu items described below and the paragraph "STORING
AND TRANSFERRING DATA TO A PERSONAL COMPUTER" on page 31).
2) Identifier of the sample being measured : it is an automatically increased progressive
number associated with the single PRINT function (print interval set to 0). The index ap-
pears in the single sample printing together with date, time, pH or mV and temperature
measured values. This menu item allows the value of the first sample to be set: each time the
PRINT key is pressed, the identification ID in the printing is increased by 1 allowing pro-
gressive measurement of all measured samples. If the Auto-Hold function, described below
in this chapter, is enabled, the print time interval is forced to zero. Pressing SERIAL only
causes the print to occur when the measurement has stabilized (HOLD symbol still). Later, it