Sper scientific LH-C10F User manual

Portable Residual Chlorine Analyzer
LH-C10F
Instruction Manual

Content
Instrument Overview........................................................................1
Safety Warning..................................................................................2
Precautions........................................................................................3
Instrument Description......................................................................4
Instrument Operation.........................................................................5
Instrument Maintenance.....................................................................7
Common Troubleshooting..................................................................8
After Service........................................................................................9

1
Instrument Overview
This instrument operates on principle of DPD spectrophotometry,which is specially used to determine the
concentration of residual chlorine in water sample.A large number of experiments have proved that this
method is simple,quick and sensitive.The instrument is small in size,light in weight,easy to carry,suitable for
use in the field and on-site,and has the following notable features:
Small size,light weight,protection grade IP65.
Professional optical path design,good optical system stability.
Small amount of samples and reagents need,fast analysis speed.
With automatic shutdown and power saving function,long standby time.
Clear display and easy operation.
This instrument is produced in strict accordance with the requirements of the ISO9001 2015 quality
management system,and has been strictly tested and calibrated before leaving the factory.

2
Safety Warning
The test reagent are irritating,please do not directly touch the skin.Please wear gloves and protective
glasses.If you come into contact with the chemicals,immediately wash with water.Please read the
measurement procedures carefully,and specially notice the danger precaution.Incorrect operating may result
injury to the operator or damage to the instrument.If you have any questions about reagents or operating
procedures,please contact our company.
Warning;Keep chemical reagents away from minors.
Hazard information prompts:this manual will use slogans(danger,warning,attention)to try to avoid the
occurrence of hazards.
Danger indicates the existence of a potentially dangerous situation,which,if not avoided,may cause death or
serious injury.
Warning indicates that a potentially dangerous situation may cause injuries.
Attention indicates to notice special information.
Warning labels Please pay special attention to the labels attached to the instrument.If not noticed may cause
damage to the operator or the instrument.

3
Precautions
When the sample is turbid or colored,which will affect the test.Do not filter or decolorize the sample,in
case cause losing residual chlorine.Please use the water sample as a reference to zero the instrument
before testing,it could compensate effect of interference.
Indoor environment without direct sunlight,if not close the detection tank cover will not effect the
test.Outdoor environment with direct sunlight,please close the detection tank cover.
The instrument must be completed within 1 minute after adding the reagent,otherwise it will affect the
detection accuracy,and little reagent are insoluble will not affect the instrument.
Any liquid or foreign matter entering the measurement basin may damage the instrument,please to wipe
clean the basin.
When the concentration of residual chlorine of the sample is high,the dark red color appeared after
adding reagent will quickly fade away.Because the oxidized reagent is bleached by the residual
chlorine.If the concentration of the water sample exceeds the range of the instrument,please dilute the
water sample with distilled water or pure water(boil it and let it cool for use)by a certain multiple and
re-measure.The measured value multiplied by the dilution multiple is the actual concentration of the
water sample.
The reagent packaging bag is an easy-to-tear bag,which can be torn on any surface.
Please clean the cuvette after each test,and the straw needs to be cleaned several times;If the inner face
of the cuvette is dirty,please clean it with detergent,then rinse with clean water and dry it before use.
Do not expose the cuvette to organic solvents such as alcohol.
Please sure no water stains,scratches,dust,fingerprints etc. On the surface of the cuvette.
The water sample in the cuvette must have no bubbles,which will affect the accuracy of test.

4
Instrument Description
Instrument structure
The instrument is composed of plastic structure,electronic system,display screen,touch buttons and cuvette.

5
Instrument Operation
Before the test:
1.Handhold bottleneck of cuvette,and wipe the surface of the cuvette with a lens cloth before inserting it into
the detection tank.
2.Wash the pipette and cuvette when absorb the solution.
3.Add the residual chlorine reagent and shake as soon as possible,and complete the test within one minute
after covering the detection tank cover.
4.Open the detection tank cover to check whether there are foreign matters,water stains etc.Please clean it
before using if there exist.
Measurement steps:
(1) Press the “on/off” button,the screen displays “C10F” and finally displays “IdLE” that indicate the
instrument is waiting for the test.
(2) Take an appropriate amount of water sample to wash the cuvette and cap and pour it out.Then take 5mL
water sample(scale position)into the cuvette,cover the detection tank cover,wipe the water stains or
fingerprints on the surface of the cuvette with a lens cloth,and put it into the detection tank.Please notice
below diagram：
(3) Press the “Zero” key to zero test.
(4) When the instrument displays“0.00”,take out the cuvette and open the cap,add a pack of residual
chlorine HR reagent,then cover the detection tank cover.
(5) Shake the cuvette up and down 40 seconds to dissolve the reagents as much as possible.If there are
bubbles,tilt the cuvette slightly to drain the bubbles and wipe off any water stains or fingerprints on the
surface.
(6) Put the cuvette into the detection tank and let it stand for 20 seconds,and then press the
“Measuring”button.The value displayed on the screen is the measured concentration value(unit:mg/L)
Note:After adding the residual chlorine HR reagent,please shake it as soon as possible and complete the test
within one minute,otherwise the test accuracy will be affected.
(7) After testing,please clean the foreign matters in the detection tank in time,and return the detection tank
cover to keep the interior clean.

6
Measurement range
0.10~10.00mg/L
Light source
LED emitting diode
Wavelength
520nm
Accuracy
<1.0mg/L,error:±0.05mg/L
>1.0mg/L,error:<±5%
Principal
Residual Chlorine reacts directly with
N,N-diethyl-1,4-phenylenediamine(DPD) at PH
6.2~6.5 to form a red complex,which is measured by
spectrophotometry at 520nm.
Battery capacity
40 hours plus
Size
128*70*48mm
Weight
188g(include battery)

7
Instrument Maintenance
Sample collection,preservation and storage.
The residual chlorine in the water sample is extremely unstable.It should be measured immediately after
sampling,and strong light vibration and warmth should be avoided from beginning to end.
Standard solution configuration:Refer to HJ586-2010 of China National Environment Protection Standard.
Interface factors
Oxidant:amine,iodine,bromine,amine,iodoamine,hydrogen peroxide,chromate,ytterbium oxide,ozone
etc.
Reducing agent:nitrite etc.
If the alkalinity of the water exceeds 250mg/L or the acidity exceeds 150mg/L,the measured value will
be unstable,and it can be adjusted by adding dilute hydrochloric acid or sodium hydroxide solution.
Battery replacement
1.Use a Phillips screwdriver to remove the battery cover at the bottom of the instrument.
2.Take out the battery,don’t place it randomly,and recycle it in an environmentally friendly way.
3.Put 2 new AA batteries into the battery slot,paying attention to the direction of the batteries.
4.Reassemble the battery cover with the removed screws.
5.If the battery is not used for a long time,the battery must be taken out to prevent battery leakage.

8
Common Troubleshooting
Before starting up,check whether the battery is properly installed.
If you you still can’t troubleshoot the fault or other faults occur,please contact us for after-sales service.
Phenomenon
Cause
Solution
Press ON/OFF,no display
Battery power off
Replace battery
Button insensitive
Water or oil stains on the surface
of the instrument
Wipe clear
Large measurement error
Have bubbles in cuvette
Remove bubbles,test again
Detection tank not clean
Clean detection tank,test again
Display Err 1
Detected value is too low during
zero set
Use pure water zero set
Shutdown instrument then start on
again
Display Err 2
Detection of effective value out of
tolerance
Replace low concentration
solution
Display Err3
The absorbance of the detection
solution is out of range
Replace
low concentration
solution
Display HHHH
The detected solution
concentration exceeds the set
range 20%
Replace
low concentration
solution

9
After Service
1. Sper Scientific warrants this product to the original purchaser against any defects that are due to faulty
material or workmanship for a period of one year from date of purchase. In the event that a defect is
discovered during the warranty period, Sper Scientific agrees that, at its option, it will repair or replace the
defective product.
2. This warranty does not apply to the condition listing below:
●The damage of the product caused by the improper installation or use
●Damage by the force majeure, such as earthquake or fire
●The product is out the time limit
3. Keep the manual and warranty card properly.