Hach 2100N Instruction Manual page 34

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SECTION 3,
continued
Item Name
1 ENTER
2 DOWN ARROW
3 RIGHT ARROW
4 UP ARROW
5 Display
6 NEPH
7 NTU
8 EBC
9 Lamp
10 Manual Range
11 Auto Range
12 CAL?
13 RANGE
14 UNITS Exit
15 RATIO
16 PRINT
17 SIGNAL AVG
18 S0 thru S4
19 CAL
Power Cord
20
Receptacle
21 I/O
22 Fuse Holder
Serial Interface
23
Connector
24 Air Purge Fitting
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Table 1 Operating Features and Functional Descriptions
Description
Used in Calibration Mode to select the value of the Formazin calibration standard and to initiate
measurement of the standard. Pressing
clears the buffer of all previous data.
Edits an LED digit in the calibration mode, steps through calibration standards (S0, S1, S2, S3 or S4)
when checking data points, or steps through diagnostic sequences.
Moves the editing cursor to the digits being edited in the calibration mode, or initiates editing of a
standard value. Also, forces a dilution water value to zero during calibration.
Edits an LED digit in the calibration mode, steps through calibration standards when checking data
points, or steps through diagnostic sequences (opposite direction of down arrow).
Five-digit LED display.
Lights when the instrument is set for Nephelos unit of measure.
Lights when the instrument is set for NTU unit of measure.
Lights when the instrument is set for EBC unit of measure.
Lighted annunciator indicates when the instrument lamp is on. Flashes to indicate a low-level
light condition.
Lights when the instrument is in the manual ranging mode.
Lighted annunciator indicates when the instrument is in the automatic ranging mode.
Lights to indicate that the calibration information recorded during the calibration process is outside of
the acceptable range. This may indicate an operator error during calibration, or possibly an
instrument malfunction. If the CAL? annunciator flashes, the instrument must be recalibrated.
Selects Auto Ranging or Manual Ranging. Pressing
options.
Selects units of measure (i.e., NTUs, EBCs or Nephelos). Also, exits calibration without saving
new values.
Turns ratio feature on or off. Lighted annunciator indicates ratio on. Flashes to indicate over-range of
40 NTU when ratio is off.
Transmits the result of measurement to a computer or printer. If the instrument is in the calibration
review mode, pressing
PRINT
held during power up, a full set of diagnostic results is transmitted to a computer or printer.
Turns the signal averaging function on or off. Lighted annunciator indicates Signal Averaging mode is
on.
Lights to indicate the current calibration point standard in use.
Initiates calibration mode in NTU units. The
review of previous calibration points. The calibration procedure automatically sets calibration for the
EBC and NEPH units of measure.
Connection for line power cord. Must be correct rating for line voltage used.
Power switch turns instrument on and off
Contains two time-delay, 1.6 amp, 250V fuses suitable for either 115- or 230-volt operation
DB9 male connector for RS232 cable connection
Connection for air purge tubing. Maximum pressure 20 psig
ENTER
during measurement with Signal Averaging on,
RANGE
transmits calibration data to a printer or computer. If the
key also accepts new calibration values and permits
CAL
34
steps the instrument through the range
PRINT
key is