Hach Lachat User manual

DOC272.97.80511
Lachat Amperometric Detector
04/2015, Edition 1
User Instructions

Table of contents
Specifications on page 3 Startup on page 22
General information on page 3 Maintenance on page 22
Installation on page 9 Troubleshooting on page 26
User interface on page 20 Replacement parts on page 27
Specifications
Specifications are subject to change without notice.
Amperometric detector enclosure
Specification Details
Dimensions (W x D x H) Closed: 27.94 x 22.86 x 12.07 cm (11 x 9 x 4.75 in.); Open: 27.94 x 28.26 x 27 cm
(11 x 11.126 x 10.625 in.)
Weight 2.43 kg (5.35 lb)
Potentiostat
Specification Details
Dimensions (W x D x H) 10 x 6.5 x 18 cm (4 x 2.5 x 7 in.)
Weight 0.9 kg (2 lb)
Operating temperature 5 to 40 ºC (41 to 104 ºF)
Operating humidity 80% maximum relative humidity for temperatures up to 31 ºC (88 ºF) decreasing
linearly to 50% at 40 ºC (104 ºF)
Power requirements 10 to 16 VDC unregulated at no-load, 100 mA/hour; Internal battery: NiCad,
standard 9 V rechargeable battery; Power supply: 12 VDC, 10 mA
Power output 0 to 1 VDC at I OUT port
Note: 1 VDC agrees with a full-scale reading in the selected range. For example, the I OUT port
signal is 0.5 V when the range setting is 10 nA and a flow cell current is 5 nA.
Applied potential to flow cell ± 1.500 V
Measurement range 5, 10 and 20 nA range: ± 19.99 nA; 50, 100 and 200 nA range: ± 199.9 nA
Offset ± 199.9 nA
Output filter 0.03, 0.08 or 0.3 Hz
General information
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. The manufacturer reserves the right to
make changes in this manual and the products it describes at any time, without notice or obligation.
Revised editions are found on the manufacturer’s website.
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Safety information
N O T I C E
The manufacturer is not responsible for any damages due to misapplication or misuse of this product including,
without limitation, direct, incidental and consequential damages, and disclaims such damages to the full extent
permitted under applicable law. The user is solely responsible to identify critical application risks and install
appropriate mechanisms to protect processes during a possible equipment malfunction.
Please read this entire manual before unpacking, setting up or operating this equipment. Pay
attention to all danger 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.
Use of hazard information
D A N G E R
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 avoided, could result in death or serious
injury.
CAUTION
Indicates a potentially hazardous situation that may result in minor or moderate injury.
N O T I C E
Indicates a situation which, if not avoided, may cause damage to the instrument. Information that requires special
emphasis.
Precautionary labels
Read all labels and tags attached to the instrument. Personal injury or damage to the instrument
could occur if not observed. A symbol on the instrument is referenced in the manual with a
precautionary statement.
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 presence of devices sensitive to Electro-static Discharge (ESD) and
indicates that care must be taken to prevent damage with the equipment.
Electrical equipment marked with this symbol may not be disposed of in European domestic or public
disposal systems. Return old or end-of-life equipment to the manufacturer for disposal at no charge to
the user.
Certification
Canadian Radio Interference-Causing Equipment Regulation, IECS-003, Class A:
Supporting test records reside with the manufacturer.
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numérique de classe A répond à toutes les exigences de la réglementation canadienne
sur les équipements provoquant des interférences.
FCC Part 15, Class "A" Limits
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Supporting test records reside with the manufacturer. The device complies with Part 15 of the FCC
Rules. Operation is subject to the following conditions:
1. The equipment may not cause harmful interference.
2. The equipment must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications to this equipment not expressly approved by the party responsible for
compliance could void the user's authority to operate the equipment. This equipment has been tested
and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules.
These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference, in which case the user will be required to
correct the interference at their expense. The following techniques can be used to reduce
interference problems:
1. Move the equipment away from the device receiving the interference.
2. Reposition the receiving antenna for the device receiving the interference.
3. Try combinations of the above.
Product overview
The amperometric detector is an accessory for the QC8500 flow injection analyzer. The
amperometric detector is necessary to do sample analysis for cyanide with the QuikChem®
amperometric cyanide methods. Refer to the QuikChem methods for the other instruments
necessary to analyze samples with the QuikChem® amperometric cyanide methods.
Refer to the QuikChem method and the supplied Principles of EC Detection and Troubleshooting
Guide manual for theory of operation.
Figure 1 shows the amperometric detector fully installed.
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Figure 1 System overview
1 Potentiostat1 (LC-3D) 6 Amperometric detector enclosure (open)
2 Direct voltage plate 7 Flow cell
3 Cell lead cable 8 Outlet tubing for the flow cell
4 BNC cable 9 Inlet tubing for the flow cell
5 Power supply for potentiostat 10 QC8500 channel
Product components
Make sure that all components have been received. Refer to Figure 2, Figure 3 and Figure 4. If any
items are missing or damaged, contact the manufacturer or a sales representative immediately.
1The potentiostat is referred to as the amperometric controller in the QuikChem methods.
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Figure 2 Product components
1 Amperometric detector enclosure (closed) 8 Potentiostat (LC-3D) with power supply
2 Principles of EC Detection and Troubleshooting
Guide Manual
9 Direct voltage plate
3 Cross-flow cell kit (refer to Figure 3)10 BNC cable
4 Electrode polishing kit (refer to Figure 4)11 Cell lead cable
5 Storage vial for the reference electrodes 12 Cable with green banana jack2
6 Teflon tubing (0.009 in. ID x 1/16 in. OD) 13 Silver working electrode (MF-1008)
7 Nut and ferrule for tubing 14 Working electrode jumper
2Not used
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Figure 3 Cross-flow cell kit
1 Reference electrodes with O-rings (3x) 4 Quick-release clamp
2 Carbon working electrode (MF-1000)35 Flow cell dowel plate
3 Reference electrode holder 6 Cell gaskets, 51-μM (0.002-in.) thick (4x)
Figure 4 Electrode polishing kit
1 Glass plates (2x) 5 3-μm fine diamond polish, 2 mL
2 Nylon diamond polish pads (10x) 6 1-μm very fine diamond polish, 2 mL
3 0.05-μm polishing alumina, 7 mL 7 Alumina polish pads, brown (5x)
4 15-μm coarse polishing diamond, 2 mL 8 Fine grit pads, gray (5x)
3Not used
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Installation
CAUTION
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
Installation guidelines
Amperometric detection is a highly sensitive technique because the currents measured are usually in
the picoampere or nanoampere range. Electrical disturbances in the environment have an effect on
operation. In addition, temperature has an effect on the response (and baseline drift) because
detection is a chemical reaction. The effect of temperature is easiest to see at high detector gain.
Install the amperometric detector:
• Indoors in a clean, dry, well-ventilated and temperature-controlled location.
• Away from direct sunlight and heat sources.
• Away from drafts, windows, refrigerators and air ducts.
• Away from radio-frequency (RF) interferences (e.g., wifi devices).
• In a location with minimum mechanical vibrations and electronic noise.
• In a location where there is sufficient clearance to make plumbing and electrical connections.
Connect the entire system to the same grounded power line to prevent electrical noise. Select a
power line that is not used by instruments that cause electrical noise in the power line (e.g., ovens,
mixers or motors).
If electro-static discharge (ESD) causes electrical interference, operate the detector in a static-safe
area with anti-static floor pads and work bench pads.
Install ferrites on the cables as necessary to prevent electrical noise.
Assemble the flow cell
N O T I C E
Two working electrodes are supplied. Use the silver working electrode (MF-1008). Do not use the carbon working
electrode (MF-1000).
Assemble the flow cell in the amperometric detector enclosure. Refer to Figure 5 to collect the parts
used. Refer to the illustrated steps that follow to assemble the flow cell.
Note: When installed, the working electrode jumper increases the size of the working electrode by two times, which
increases the signal.
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Figure 5 Flow cell parts
1 Auxiliary electrode (factory installed) 4 Silver working electrode, MF-1008 (item 13 in
Figure 2 on page 7)
2 Cell gasket (item 6 in Figure 3 on page 8) 5 Flow cell dowel plate (item 5 in Figure 3 on page 8)
3 Working electrode jumper (item 14 in Figure 2
on page 7)
6 Quick-release clamp (item 4 in Figure 3 on page 8)
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