DOC023.52.80034
CL17 Chlorine Analyzer
USER MANUAL
02/2014, Edition 9
© Hach Company, 2000, 2001, 2004, 2008, 2009-2011, 2013, 2014. All rights reserved. Printed in the U.S.A./Germany
1
Table of Contents
Section 1 Specifications.................................................................................................................... 3
Section 2 General information......................................................................................................... 5
2.1 Safety information........................................................................................................................ 5
2.1.1 Use of hazard information................................................................................................... 5
2.1.2 Precautionary labels ........................................................................................................... 5
2.2 General product information ........................................................................................................ 6
2.2.1 Instrument description......................................................................................................... 6
2.2.2 Method of analysis .............................................................................................................. 7
2.2.3 Theory of operation............................................................................................................. 8
Section 3 Installation.......................................................................................................................... 9
3.1 Unpack the instrument.................................................................................................................9
3.2 Instrument environmental considerations .................................................................................... 9
3.3 Mount the instrument on the wall................................................................................................. 9
3.4 Plumbing connections................................................................................................................ 12
3.5 Installing the sample line............................................................................................................ 13
3.6 Sample conditioning................................................................................................................... 14
3.6.1 Assemble the sample conditioning kit............................................................................... 14
3.6.2 Use the sample conditioning kit ........................................................................................ 15
3.7 Optional air purge ...................................................................................................................... 18
3.8 Electrical connections ................................................................................................................ 18
3.8.1 Power connections............................................................................................................ 19
3.8.2 Wiring the instrument ........................................................................................................ 20
3.8.3 Voltage selection for alternate voltage operation.............................................................. 21
3.8.4 Alarm connections ............................................................................................................ 22
3.8.5 Recorder output connections ............................................................................................ 23
3.9 Install the pump/valve pinch plate.............................................................................................. 24
Section 4 System Startup................................................................................................................ 27
4.1 Install the reagents..................................................................................................................... 27
4.2 Install the stir bar........................................................................................................................ 28
4.3 Supply the sample .................................................................................................................... 29
4.4 Supply power to the analyzer..................................................................................................... 29
Section 5 Operation.......................................................................................................................... 31
5.1 Keypad and display information................................................................................................. 31
5.2 Instrument menu structure......................................................................................................... 32
5.2.1 Setup menu....................................................................................................................... 32
5.2.2 Alarm setup....................................................................................................................... 33
5.2.3 Set the recorder output span ............................................................................................ 34
5.2.3.1 Change to 0 to 20 mA output range......................................................................... 35
5.2.4 Maintenance menus..........................................................................................................35
5.3 Calibration.................................................................................................................................. 36
5.3.1 Calibration on known standards........................................................................................ 36
5.3.2 Calibration by comparison ................................................................................................ 37
Section 6 Maintenance .................................................................................................................... 39
6.1 Scheduled maintenance ........................................................................................................... 39
6.1.1 Replenish the reagents ....................................................................................................39
6.1.2 Replace the pump tubing.................................................................................................. 39
6.1.3 Replace the analyzer tubing ............................................................................................. 40
6.2 Unscheduled maintenance ....................................................................................................... 41
6.2.1 Fuse replacement ............................................................................................................ 41
6.2.2 Clean the instrument enclosure ........................................................................................ 42
6.2.3 Clean the colorimeter........................................................................................................ 42
2
Table of Contents
6.2.4 Replace the sample conditioning filter ..............................................................................44
6.2.5 Reagent spill clean up .......................................................................................................44
Section 7 Troubleshooting..............................................................................................................45
7.1 Troubleshooting guide................................................................................................................45
7.2 System alarms............................................................................................................................46
7.3 System warnings ........................................................................................................................47
Section 8 Parts and accessories ...................................................................................................49
Section 9 Contact information .......................................................................................................51
Section 10 Certification....................................................................................................................53
10.1 FCC PART 15, Class "A" Limits ...............................................................................................53
Appendix A Network Interface Card .............................................................................................55
A.1 Attach the analyzer to the network using an AquaTrend interface ............................................55
A.2 Adding the measurement to a channel ......................................................................................56
A.3 Alarms and warnings .................................................................................................................56
A.4 Logging data using the serial input/output module ....................................................................56
A.5 Manually polling data .................................................................................................................57
A.6 Using the signal output module..................................................................................................57
A.7 Logging data using the MOD I/O module...................................................................................57
3
Section 1 Specifications
Specifications are subject to change without notice.
General
Display
LCD, 3½-digit measurement readout and six-character alphanumeric scrolling
text line.
Enclosure IP62-rated with the gasketed door latched
Instrument description 31.4 cm (W) x 45.4 cm (H) x 17.9 (D) (12.4 x 17.88 x 7.06 in.)
Mounting Wall mount
Instrument shipping weight 10.49 kg (23 lb)
Warranty
Hach Company warrants its products to the original purchaser against any
defects that are due to faulty material or workmanship for a period of one year
from the date of shipment unless otherwise noted in the product manual.
Certification CE approved. Listed to UL and CSA safety standards by ETL.
Sample Requirements
Sample flow rate to sample conditioning 200 to 500 mL/min
Inlet pressure to instrument
1 to 5 psig; 1.5 psig is optimum. Exceeding 5 psig can cause sample
tubing failure unless sample conditioning is used.
Inlet pressure to sampling conditioning
1.5 to 75 psig (with sample tube level with the bottom of the instrument—see
Figure 7 on page 16.)
Sample temperature range 5 to 40 °C (41 to 104 °F)
Inlet fitting at instrument ¼-inch OD polyethylene tubing with quick-disconnect fitting
Drain fitting ½-inch hose barb
Sample conditioning Use provided sample conditioning
Regent/Standard Requirements
Maximum reagent usage One-half liter per month (each of the two reagents)
Reagent containers High-density polyethylene (2) ½-liter bottles
Reagent containment
Reagent bottles are contained inside the analyzer enclosure and are vented
externally.
Electrical
Power requirements
100–115/230 VAC (selection switch inside instrument); 90 VA, 50/60 Hz, 2.5 Amp
fuse
Power connection
Connection made by three wire barrier terminal block through a ½-inch conduit
hole in the case. Wire range: 18 AWG.
Installation category II
Polution degree 2
Protection class I
Alarm relay outputs
Two unpowered SPDT relays each rated at 5 A resistive, 240 V ac maximum.
Can function as sample set point alarms (high or low) or as a system warning
indicator or a system alarm indicator. Use either high voltage (greater than 30 V
RMS and 42.2 V PEAK or 60 V dc) or low voltage (less than 30 V RMS and 42.2
V PEAK or 60 V dc). Do not use a combination of high and low voltage.
Alarm connection
Connection made by a removable three wire plug through a ½-inch conduit hole
in the case. Wire range: 12–18 AWG.
Recorder output
One isolated recorder output, 4–20 mA (can be adjusted to 0–20 mA).
Recommended load impedance 3.6 to 500 ohms
Recorder output connections
Connection made by a removable three wire plug through a ½-inch conduit hole
in the case. Wire range: 12–22 AWG.
4
Specifications
Optical
Light source
Class 1 LED (light emitting diode) with a peak wavelength of 520 nm; 50,000
hours estimated minimum life
Performance
Operating range 0–5 mg/L free or residual chlorine
Accuracy ±5% or ±0.03 ppm whichever is greater
Precision ±5% or ±0.01 ppm whichever is greater
Quantitation limit 0.09 ppm
Cycle time 2.5 minutes
Detection limit 0.03 ppm
Calibration Uses default calibration curve
Power switch User accessible power switch is required
Recorder One 4-20 mA/0–20 mA
Alarm relay outputs
Two SPDT relays, 5A resistive load at 240 V ac. Can function as sample set
point alarms (high or low) or as a system warning indicator or a system alarm
indicator.
Optional external outputs Hach AquaTrend
®
Network Interface
Environmental
Storage temperature range -40 to 60 °C (-40 to 140 °F)
Operating temperature range 5 to 40 °C (41 to 104 °F)
Humidity 90% at 40 °C (90% at 104 °F)
Air purge (optional) 0.1 CFM instrument quality air at 20 psig maximum, ¼-inch OD tubing
Altitude 2000 m (6561 ft)
5
Section 2 General information
The information in this manual has been carefully checked and is believed to be
accurate. However, the manufacturer assumes no responsibility for any inaccuracies that
may be contained in this manual. In no event will the manufacturer be liable for direct,
indirect, special, incidental or consequential damages resulting from any defect or
omission in this manual, even if advised of the possibility of such damages. In the interest
of continued product development, the manufacturer reserves the right to make
improvements in this manual and the products it describes at any time, without notice or
obligation.
Revised editions are found on the manufacturer’s website.
2.1 Safety information
Please read this entire manual before unpacking, setting up or operating this equipment.
Pay attention to all danger, warning and caution statements. Failure to do so could result
in serious injury to the operator or damage to the equipment.
Make sure that the protection provided by this equipment is not impaired, do not use or
install this equipment in any manner other than that specified in this manual.
2.1.1 Use of hazard information
DANGER
Indicates a potentially or imminently hazardous situation which, if not avoided, will
result in death or serious injury.
WARNING
Indicates a potentially or imminently hazardous situation which, if not av oided,
could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation that may result in minor or moderate
injury.
Notice: Indicates a situation that is not related to personal injury.
Important Note: Indicates a situation which, if not avoided, may cause damage to the
instrument. Information that requires sp ec ial em p has is.
Note: Information that supplements points in the main text.
2.1.2 Precautionary labels
Read all labels and tags attached to the instrument. Personal injury or damage to the
instrument could occur if not observed.
Electrical equipment marked with this symbol may not be disposed of in European public disposal systems after
12 August of 2005. In conformity with European local and national regulations (EU Directive 2002/96/EC),
European electrical equipment users must now return old or end-of life equipment to the Producer for disposal at no
charge to the user.
Note: For return for recycling, please contact the equipment producer or supplier for instructions on how to return
end-of-life equipment, producer-supplied electrical accessories, and all auxiliary items for proper disposal.
This is the safety alert symbol. Obey all safety messages that follow this symbol to avoid potential injury. If on the
instrument, refer to the instruction manual for operation or safety information.
This symbol indicates the need for protective eye wear.
6
General information
2.2 General product information
2.2.1 Instrument description
DANGER
Chemical or biological hazards. If this instrument is used to monitor a treatment
process and/or chemical feed system for which there are regulatory limits and
monitoring requirements related to public health, public safety, food or beverage
manufacture or processing, it is the responsibility of the user of this instrument to
know and abide by any applicable regulation and to have suf ficient and appr opriate
mechanisms in place for compliance with applicable regulations in the event of
malfunction of the instrument.
The Hach CL17 Chlorine Analyzer (Figure 1) is a microprocessor-controlled, process
analyzer designed to monitor a sample stream continuously for chlorine content. Either
free or total chlorine, in the range of 0 to 5 mg/L, can be monitored. The buffer and
indicator solutions used determine the choice for free or total chlorine analysis.
CAUTION
Fire hazard. This analyzer is intended to be used for aqueous samples only.
The CL17 Chlorine Analyzer enclosure is environmentally rated for IP62 per IEC 529.
The enclosure is dust-tight, and drip-resistant but is not designed for outdoor use.
The instrument uses a DPD Colorimetric Method which includes a
N,N-Diethyl-p-phenylenediamine (DPD) indicator and a buffer. The indicator and buffer
are introduced into the sample, causing a red color to form with an intensity proportional
to the chlorine concentration. Chlorine concentration, measured photometrically, is
displayed on the front panel, three-digit, LCD readout in mg/L Cl
2
.
A recorder output (4-20 mA) is available. Recorder span minimum and maximum values
in mg/L Cl
2
are programmed by the operator at the analyzer keyboard.
Programmable alarm circuits provide relay closures, both normally open and normally
closed, for two selectable chlorine level set points. Set points can be programmed by the
operator anywhere within the overall range. System warning and system alarm features
provide automatic, self-testing diagnostics that detect a number of possible malfunctions,
and provide alarm relay closures indicating a need for operator attention.
The CL17 analyzer can be purchased with a Hach Network Interface Card which allows
the CL17 to display its readings on an AquaTrend
®
display or allows data to be sent to a
PC via a Serial Interface Module.
Indicator and buffer reagents (473 mL of each) are placed in the instrument case in the
original factory-filled bottles. Reagents are replenished once a month.
The instrument is designed so electronic components are isolated from the hydraulic
components. Windows allow the operator to observe the display indicators and reagent
supply without opening the instrument enclosure.
7
General information
2.2.2 Method of analysis
Free available chlorine (hypochlorous acid and hypochlorite ions) oxidizes the DPD
indicator reagent at a pH between 6.3 and 6.6 to form a magenta-colored compound. The
depth or intensity of the resulting color is proportional to the concentration of chlorine in
the sample. A buffer solution specifically for free chlorine maintains the proper pH.
Total available chlorine (free available chlorine plus combined chloramines) is determined
by adding potassium iodide to the reaction. Chloramines in the sample oxidize iodide to
iodine, which, along with any free available chlorine, oxidizes DPD indicator to form the
magenta color at a pH of 5.1. A different buffer solution containing potassium iodide
maintains reaction pH. After the chemical reaction is complete, the optical absorbance at
510 nm is compared to the absorbance measured through the sample before the
reagents were added. Chlorine concentration is calculated from the difference in
absorbance.
Figure 1 Chlorine analyzer
8
General information
2.2.3 Theory of operation
The analyzer is designed to capture and analyze a portion of the sample every
2.5 minutes. The sample portion is captured in the colorimeter measuring cell where the
blank absorbance is measured. Measurement of sample blank absorbance allows
compensation for any turbidity or natural color in the sample, and provides an automatic
zero reference point. Reagents are added at this point to develop the magenta color,
which is measured and compared to the reference.
A linear peristaltic pump/valve module controls the flow of incoming sample and injects
metered volumes of the buffer and indicator reagents in a 2.5 minute cycle. The
pump/valve module uses a motor-driven cam to operate pinch blocks that squeeze
special thick-walled tubing against a fixed plate. The cycle operates as follows:
1. The sample inlet line is opened, allowing sample under pressure to flush sample
tubing and the colorimeter sample cell where the measurement is made.
2. The sample inlet line is closed, leaving fresh sample in the cell. Cell volume is
controlled by an overflow weir.
3. As the sample inlet line closes, reagent lines open, allowing buffer and indicator
solutions to fill tubing in pump/valve module.
4. A measurement of untreated sample is taken to determine an average reference
measurement prior to reagent addition.
5. The reagent outlet block opens, allowing buffer and indicator to blend and enter the
colorimeter cell to mix with the sample.
6. After a delay for the development of color, a measurement of treated sample is taken
to determine the chlorine concentration.
This sequence is repeated every 2.5 minutes.
9
Section 3 Installation
DANGER
Electrocution and fire hazard. Only qualified personnel should conduct the tasks
described in this section of the manual.
3.1 Unpack the instrument
Remove the analyzer from its shipping carton and inspect it for any damage. Verify that
the Installation Kit, Cat. No. 5516400, and Maintenance Kit, Cat. No. 5444300, are
included aloing with the reagents.
If any items are missing or damaged, contact the manufacturer or distrubutor (outside the
US).
3.2 Instrument environmental considerations
The instrument enclosure is designed for general-duty, indoor installation with a nearly
constant ambient temperature between 5° and 40 °C (18° to 104 °F). The enclosure
environmental rating is IP62 with the door closed and latched. Do not mount the
instrument in direct sunlight; shield from dripping water.
3.3 Mount the instrument on the wall
The instrument case is designed for wall mounting. Refer to Figure 2, Figure 3, and
Figure 4 for dimensions and other installation information. Use ¼-inch screws for
mounting. Mount the instrument as close to the sampling point as practical to ensure
complete purging of the sample line during each cycle. Leave adequate clearance at the
sides and bottom of the instrument case for plumbing and wiring connections.
10
Installation
Figure 2 CL17 instrument dimensions (1 of 3)
1 Air purge quick connect
.25 O.D. Polyethylene Tubing, (4743800)
4 Power connections
2 Relay / alarm contact connections 5 4 x ¼” recommended mounting bolt
3 Network and 4-20 mA connections
11
Installation
Figure 3 CL17 instrument dimensions (2 of 3)
12
Installation
3.4 Plumbing connections
Note: The sample drain contains analysis wastes, which include both sample and chemical
reagents. The enclosure drain produces no waste under normal use. However, in the event of spills
or leaks, some waste may be produced. Although the chemicals used are of low concentration, it is
best to check with local authorities concerning proper disposal of waste from this product.
Sample inlet and drain connections are made on the bottom of the instrument using a
quick connect fitting for ¼-inch OD tubing. Refer to Figure 5. Connect the ¼-inch O.D.
poly tubing by pushing it into the fitting. Two distinct “stops” will be felt as the tubing is
correctly attached. If the tubing is not properly seated, it will come loose when water
pressure is applied. The sample drain fitting is sized for ½-inch ID flexible tubing (not
supplied).
CAUTION
Fire hazard. This analyzer is intended to be used for water samples only.
Note: The ½-inch enclosure drain must have at least 3 feet of tubing installed to ensure the analyzer
remains dust-tight. Never plug the drain. The drain must remain open to remove sample water in the
event of a leak.
Figure 4 CL17 instrument dimensions (3 of 3)
1 Overflow drain, recommended .50 I.D. tubing 3 Sample inlet quick connect .25 O.D. Polyethylene tubing
(4743800)
2 .50 I.D. drain tube sample
13
Installation
3.5 Installing the sample line
Selecting a good, representative sampling point is important for optimum performance of
the instrument. The sample analyzed must be representative of the condition of the entire
system. Erratic readings will be seen if sample is drawn from a location too close to
points of chemical additions to the process stream, if mixing is inadequate, or if the
chemical reaction is incomplete.
If the sample pressure into the instrument exceeds 5 psig at the analyzer inlet, flooding
and instrument damage may result unless the sample conditioning kit is installed.
Install sample line taps into the side or center of larger process pipes to minimize the
chance of ingesting sediment from the pipe line bottom or air bubbles from the top. A tap
projecting into the center of the pipe is ideal. Refer to Figure 6.
Figure 5 Plumbing connections (bottom view)
1 Front of instrument 3 Sample drain. Instrument drain fitting is sized for ½ in.
ID flexible tubing
2 Enclosure drain 4 Sample inlet. Quick connect fitting for ¼ in. O.D. tubing
14
Installation
3.6 Sample conditioning
All samples are “conditioned” using the single-sample, basic sample conditioning kit
shipped with each analyzer. The kit eliminates large particles using a 40-mesh strainer.
The ball valve on the raw sample inlet line may be used to control the amount of bypass
flow that is delivered to the filter. For dirty water, high bypass will adjust it to help keep the
strainer clean longer, or adjust it to any partially open position for continuous bypass.
Adjust the ball valve on the instrument supply line to control the flow rate of filtered
sample to the instrument.
Note: Installing the drain tee more than 2 feet above the instrument can result in excessive pressure
which may cause leaks.
Mount the centerline of the bypass drain tee two feet above the instrument. Refer to
Figure 7. When properly mounted, the vacuum breaker design of the bypass drain tee
prevents negative sample pressure and establishes the needed positive sample pressure
for sample flow through the analyzer.
3.6.1 Assemble the sample conditioning kit
Refer to the complete system diagram in Figure 7 and the tips in Table 3 to assemble the
components.
• Seal all threaded fittings with two wraps of Teflon
®
tape (provided).
• Two stops should be felt when installing tubing into the push-in fitting. The first is when
the tubing clears the gripper ring, and the second is when the tubing meets the bottom
of the itting. To prevent leaks, make sure to push the tubing all the way in.
Note: To help grip the tubing, use rubber gloves or other material that grips and forcefully push the
tubing into the fitting. Two stops should be felt; otherwise the tubing will not be fully inserted and will
leak.
• Be sure to cut all tubing used in the push-in fittings with a sharp knife so the ends are
round, cleanly cut and not angled.
• The push-in fittings are designed for use with soft, ¼-inch OD plastic tubing as
included in the kit. Tubing material such as PTFE or HDPE is recommended. The
push-in fitting will not grip hard plastic or metal tubing and the tubing will slip out.
Figure 6 Sample line location in the process stream
1 Poor 4 Sediment (typical)
2 Poor 5 Good
3 Air (typical) 6 Best
15
Installation
3.6.2 Use the sample conditioning kit
Assemble the head height regulator (stand-pipe) and filter as shown in Figure 7. Make
sure the sample pressure to the sample conditioning is between 1.5 and 75-psig for
proper operation.
1. Set flow by adjusting the ball valve (item 18, in Figure 7). The valve is fully closed
when the lever is perpendicular to the valve body and fully open when the lever is
parallel with the valve body.
2. Observe the flow in the unfiltered sample bypass (clear tube, item 13 in
Figure 7). Make sure the flow is adjusted so there is always bypass flow.
3. Use the ball valve (item 19) to turn off sample flow to the instrument.
16
Installation
Figure 7 Sample conditioning kit
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