Hach Lange 2100AN, Инструкция по эксплуатации инструмента

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SECTION 3,
continued
33
3.1.1 Using the
RANGE
Key
Refer to Section 15 Specifications for the instrument ranges. Select automatic or
manual ranging by pressing the
RANGE
key. Repeated presses step the instrument
from automatic range to manual range and then through each of the four manual
range settings. When automatic ranging is selected, the Auto Range annunciator
lights. In manual ranging, the Manual Range annunciator lights. The instrument
defaults to auto ranging during calibration. Range selection may be made at any
time during sample measurement. If the instrument is turned off, it defaults to the
last selected range setting when power is restored to the instrument.
The display flashes all 9s or all 0s when the sample being measured is over-range
or under-range, respectively. Press the
RANGE
key to select the proper
measurement range. If the over-range display flashes in Automatic Ranging or in
the highest Manual Range, the sample is over-range for the instrument and must
be diluted prior to measurement (refer to Section 2.3.7 on page 26).
For samples in excess of 40 NTUs, 268 Nephelos, 9.8 EBCs, or equivalent
Application Specific units, the display flashes 9s to indicate over-range if the
RATIO
mode is off. Ratioing must be on to measure samples above these levels.
3.1.2 Using the
UNITS/Exit
Key
This key selects the unit of measure. In addition, the
UNITS/Exit
key returns the
instrument to the Sample mode (measurement) from any other software location.
If power is interrupted, the instrument returns to the last selected unit of measure
when power is restored.
Press the
UNITS/Exit
key repeatedly until the desired unit of measure is displayed.
The units are displayed in the last three positions of the LED display.
The
UNITS/Exit
key also exits calibration without saving new values; previously
stored calibrations are saved. Calibration information can be reviewed by entering
the calibration mode, and then exited without changing the stored calibration data.
Also, if an error is made during calibration, pressing the
UNITS/Exit
key escapes
the calibration routine without saving the new data.
22 Fuse Holder Contains two time-delay, 1.6 amp, 250V fuses suitable for either 115- or 230-volt operation.
23 I/O Power switch turns instrument on and off.
24
Serial Interface
Connector
DB9 connector for RS232 cable connection.
25 Air Purge Fitting Connection for air purge tubing. Maximum pressure 138 kPa (20 psig).
26
Recorder Output
Jack
Provides 0-1 volt output for operation with a chart recorder.
27 Remote Cable Jack Flow-Valve Module connection for automated Flow-Cell Kit operation (low pressure).
(not shown)
Light Shield
Covers sample cell compartment to eliminate light that would interfere with the measurement.
Must be closed during measurement, calibration and at power on; keep closed except when inserting
sample cell.
(not shown)
Cell Holder Holds sample cell with solution to be measured. The reference mark is used to align the sample cell
for proper orientation in the cell holder.
Table 1 Operating Features and Functional Descriptions (continued)
Item Name Description