Hach CL17 User Manual

Page 42
Instrument Menu Structure
54400_start.fm
Section 2
4. Prepare a chlorine standard solution with a value between 3 and 5 mg/L.
Determine the value of the standard to the nearest 0.01 mg/L.
5. Remove the container of zero reference water and substitute the chlorine
standard solution. Allow the analyzer to run on the standard solution for
approximately 10 minutes.
6. When the readings are stable, enter the
SETUP menu.
7. Press the
DOWN ARROW key until CAL STD is displayed. Press ENTER.
The current measured value is displayed.
8. Press
ENTER and edit the value. Press ENTER again to accept the
value.The measured value will be forced to the entered value. Press the
EXIT key three times to return to normal display mode.
9. Remove the standard and restore sample flow to the analyzer. The
instrument is now calibrated.
2.7.5.2 Calibration by Comparison
Note: Make sure sample
chlorine concentration is relatively
stable before taking a grab
sample for laboratory analysis.
Perform the laboratory analysis as
quickly as possible.
Calibration by comparison involves analyzing the sample stream with a
reliable, accurate laboratory method, such as a DPD spectrophotometric or
amperometric titration method then setting the analyzer to match. Accuracy
specifications over the full 0 to 5 mg/L range cannot be assured unless the
sample chlorine concentration used for calibration is greater than 3.0 mg/L.
Setting the calibration at a lower concentration may provide accuracy at that
point but can cause large errors in other portions of the span.
Perform a calibration by comparison as follows:
1. When the sample chlorine concentration is relatively stable, obtain a grab
sample for analysis.
2. Perform a laboratory analysis (DPD spectophotometric or amperometric
titration method) on the grab sample and record the value.
3. Enter the
SETUP menu by pressing the MENU key followed by the UP
ARROW
key and ENTER.
4. Press the
DOWN ARROW key until CAL STD is displayed. Press ENTER.
The current measured value is displayed.
5. Press
ENTER and edit the value to match the value from the laboratory
analysis. Press
ENTER again to accept the value. The measured value will
be forced to the entered value.
6. Press the
EXIT key three times to return to normal display mode.

Hach CL17 Specifications

General

Power Requirements	100-240 V AC, 50/60 Hz
Outlet Pressure	Atmospheric
Measurement Method	Colorimetric DPD method
Sample Interval	2.5 minutes
Operating Temperature	5 - 40 °C (41 - 104 °F)
Parameter	Free or Total Chlorine
Operating Humidity	5 - 95% non-condensing
Sample Temperature	0 to 40°C (32 to 104°F)
Sample Flow Rate	200 to 500 mL/min
Power Consumption	Approximately 50 W
Output	4-20 mA, RS-232
Relays	Two relays
Enclosure	NEMA 4X
Resolution	0.01 mg/L
Accuracy	±5% or ±0.03 mg/L (whichever is greater)