34
SECTION 3,
continued
Table 1 Operating Features and Functional Descriptions
Item
Name
Description
1
ENTER
Used in Calibration Mode to select the value of the Formazin calibration standard and to initiate
measurement of the standard. Pressing
ENTER
during measurement with Signal Averaging on,
clears the buffer of all previous data.
2
DOWN ARROW
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.
3
RIGHT ARROW
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.
4
UP ARROW
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).
5
Display
Five-digit LED display.
6
NEPH
Lights when the instrument is set for Nephelos unit of measure.
7
NTU
Lights when the instrument is set for NTU unit of measure.
8
EBC
Lights when the instrument is set for EBC unit of measure.
9
Lamp
Lighted annunciator indicates when the instrument lamp is on. Flashes to indicate a low-level
light condition.
10
Manual Range
Lights when the instrument is in the manual ranging mode.
11
Auto Range
Lighted annunciator indicates when the instrument is in the automatic ranging mode.
12
CAL?
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.
13
RANGE
Selects Auto Ranging or Manual Ranging. Pressing
RANGE
steps the instrument through the range
options.
14
UNITS Exit
Selects units of measure (i.e., NTUs, EBCs or Nephelos). Also, exits calibration without saving
new values.
15
RATIO
Turns ratio feature on or off. Lighted annunciator indicates ratio on. Flashes to indicate over-range of
40 NTU when ratio is off.
16
Transmits the result of measurement to a computer or printer. If the instrument is in the calibration
review mode, pressing
transmits calibration data to a printer or computer. If the
key is
held during power up, a full set of diagnostic results is transmitted to a computer or printer.
17
SIGNAL AVG
Turns the signal averaging function on or off. Lighted annunciator indicates Signal Averaging mode is
on.
18
S0 thru S4
Lights to indicate the current calibration point standard in use.
19
CAL
Initiates calibration mode in NTU units. The
CAL
key also accepts new calibration values and permits
review of previous calibration points. The calibration procedure automatically sets calibration for the
EBC and NEPH units of measure.
20
Power Cord
Receptacle
Connection for line power cord. Must be correct rating for line voltage used.
21
I/O
Power switch turns instrument on and off
22
Fuse Holder
Contains two time-delay, 1.6 amp, 250V fuses suitable for either 115- or 230-volt operation
23
Serial Interface
Connector
DB9 male connector for RS232 cable connection
24
Air Purge Fitting
Connection for air purge tubing. Maximum pressure 20 psig
Tài liệu sưu tầm của Trung Sơn - www.tschem.com.vn - 028.3811.9991 - [email protected]
Tài liệu sưu tầm của Trung Sơn - www.tschem.com.vn - 028.3811.9991 - [email protected]
