Hach-Lange 2100 N IS Laboratory Turbidimeter User Manual - Manual (Page 31)

3. Push ENTER.
4. Use the arrow keys to change the value.
5. Push ENTER.
6. Push SETUP.
Computer (RS232) commands
A communication program (i.e., such as Window Terminal or ProComm
Plus) is recommended for computer operation of the instrument.
Configure the communication program to the RS232 connection settings.
Refer to
Configure the RS232 connection on page 28.
Table 4 shows the RS232 command set for the instrument.
Table 4 RS232 command set
Command Description
VAL Gets the current measurement with the measurement units.
LST Gets the calibration standards and coefficients.
DAT Gets the current date.
To change the date, enter DAT=MM/DD/YY (MM=month, DD=day,
YY=year), then push Enter.
TIM Gets the current time in 24-hour format.
To change the time, enter TIM=HH:MM (HH=hour, MM=minutes),
then push Enter.
RMN Gets the recorder minimum value.
To change the recorder minimum value, enter RMN=XXXXX
(XXXXX=a number, minimum value=0), then push Enter.
RMX Gets the recorder maximum value.
To change the recorder maximum value, enter RMX=XXXXX
(XXXXX=a number, maximum value=10,000), then push Enter.
RTN Gets the recorder trim minimum value.
To change the recorder minimum value, enter RTN=XXXXX
(XXXXX=a number, minimum value=200), then push Enter.
Table 4 RS232 command set (continued)
Command Description
RTX Gets the recorder trim maximum value.
To change the recorder maximum value, enter RTX=XXXX
(XXXX=a number, maximum value=4800), then push Enter.
SAV Gets the signal average buffer size.
To change the signal average buffer size, enter SAV=XX (XX=a
number, maximum value=15, default=10), then push Enter.
Advanced operation
Calibrate the turbidimeter with formazin standards
The instrument may be calibrated using prepared formazin standards
made from 4000-NTU formazin stock solution. Refer to
Accessories
on page 36.
Note: Use recently prepared formazin standards to get the accuracy specifications
for turbidity in
Specifications on page 5.
Prepare formazin standards
For the best accuracy and long-term data comparability, use formazin
stock solution from Hach to make formazin standards.
Note: As an alternative, a 4000-NTU formazin stock solution that is prepared by
the user may be used to make formazin standards. Refer to
Making 4000-NTU
formazin stock solution on page 32.
Prepare formazin standards immediately before calibration in an
environment that is at the same ambient temperature as the instrument.
Discard after use.
Refer to
Table 5 for the procedures to make the recommended
calibration standards.
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