User manual of PTRC-222 Portable Residual Chlorine Analyzer

Portable Residual Chlorine Analyzer

Model:PTRC-222  Operation Guide

 Email:michael@shboqu.com   WhatsApp:86-15000087545

The portable residual chlorine anlayzer has been calibrated before delivery. Users can directly determine samples by the following methods

1. Turn on the power supply of the instrument.

2. On the instrument, press the arrow key to select the function of "select curve", and confirm that the sequence number needed is selected by using the up and down arrow keys (curve 001 is 0.02-2.00mg/L, curve 002 is 2.00-10.00mg/L), and confirm by the "TNTER" key.  

3. Blank and sample preparation

3.1 Preparation of blank sample

Pick 25.0 mL distilled water up and put into a special colorimetric tube for cleaning and testing on the computer.

3.2 Preparation of samples

Take 25.0mL sample clarification solution and put it in a special colorimetric tube for cleaning. Add 1.25ml residual chlorine reagent [Note: When the drinking water is below 0.2mg/L or the water sample is alkaline (1.25mL reagent is green), add 2ml residual chlorine reagent] and shake well. It needs to be tested within 1 minute. (If total residual chlorine is measured, colorimetric analysis will take 10 minutes)

4.Clean the outer wall of the blank colorimeter, align the vertical line on the colorimeter with the line 1 on the colorimeter, put it into the colorimetric hole, select the "blank measurement" option, press the "ENTER" button, press the "ENTER" button when the absorbance value is stable, and the instrument automatically adjusts zero.

5.Clean the outer wall of the sample colorimeter to be measured, put the vertical line on the colorimeter into the colorimetric hole, select the "sample measurement" option, press the "ENTER" button, the instrument shows the residual chlorine (or total residual chlorine) value (mg/L) of the sample, and press the "confirmation" button, then value is stored in the instrument.

Operation of portable Residual Chlorine Analyzer

I. Overview

The instrument is widely used in environmental monitoring, sewage treatment and on-site detection in Colleges and universities, scientific research institutions and other departments.

The instrument has the following advantages:

1. High-performance ultra-low power 16-bit single-chip computer, the standby time of the instrument can be longer than 6 months.

2. The main engine case is made of moulded ABS material and designed with IP65. It has good anti-corrosion, waterproof and dust-proof performance.

3. It can store 10 standard curves and 199 measured values (including concentration value, absorbance and transmittance with time label for years, months, days, hours, minutes and seconds).

4. Full English display, can be charged with lithium power supply.

5. Cold light source and narrow-band interference optical system have good optical stability.

6. Data power-off protection function.

7. LCD large-screen display, easy to operate and intuitive.

II. Instrument Main Technical Index

1. Measure range: (The excess range can be diluted and then determined.)

0.00~10mg/L(Divided into two ranges: 0~2 mg/L、2~10 mg/L).

2. Indication error: ≤±3%(F.S)

3. Repeatability : ≤3%

4. Optical stability: the absorbance drift of the instrument is less than 0.002A within 20 minutes

5. Overall size: Instrument:  210mm×280mm×190mm

6. Weight : Main instrument:  500g

7. Normal conditions of use :

⑴ Environment temperature: 5~40℃   ⑵ Relative humidity: ≤85%

⑶ Power supply: Rechargeable lithium battery

⑷No significant vibration and electromagnetic interference, avoid direct sunlight.

III. Instrument Structure

     

                  Picture 1  Overall Sketch Map

8. Instrument keyboard

1)↑、↓、←、→key: Used to move cursor during setting and calibration operation.

2)Return key(ESC/!): Switch on or cancel a new operation when an operation is not completed.

3)Confirmation Key(ENTER): Confirmation of operations such as function keys

9. Host LCD

2013.03.02  08:10:23 Saturday              Main Menu 01.Sel. Curve      05. Query Curve 02.Zero Meas.      06. Query Rcd. 03.Samp Meas.     07. Del.Rcd. 04.Cal. Curve      08. System Set

Cur.Curv=001  RcdsNum.=0002

Picture 2  LCDl Sketch Map

1）Sel. Curve：Select the appropriate items according to the measuring range when testing.

2）Zero Meas.: Test the sample of blank value 

3）Samp Meas: Test the prepared sample

4）Cal. Curve: The standard curve was calibrated by measuring absorbance with standard value.

5）Query Curve: Query the standard curve from testing parameter

6）Query Rcd.: Query history record. Press "↑ ↓" to query records  one  by one.

7）Del.Rcd.:Delete all records by "ENTER",press the "ESC" back to menu operation

8）System Set: Include clock set, add curve, delete curve, input curve, password set and other functions.

10. Colorimetric holes

IV. Instrument Installation and Usage

(I). Sample testing

1. Move the cursor to the "Select Items" function and press the "ENTER" button to confirm. Select the required standard curve number by using the keyhead key, and confirm by pressing the "ENTER" key.

1. Sel. Curve    01. Residual Chlorine  L 02. Residual Chlorine  H

2. The blank colorimetric tube of the sample to be measured is inserted into the colorimetric hole in the direction, and the cursor is moved to the function of "blank measurement". The instrument shows its absorbance. After the absorbance value is stable, press the "ENTER" button, and the instrument automatically adjusts zero.

2. Zero Meas. 0 . X XXX

3. The colorimetric tube of the tested sample insert into the colorimetric hole in the direction, and the cursor is moved to the function of "Samp Meas.". The instrument displays the concentration value of the sample. After stabilization, press the "ENTER" key, and the instrument stores the concentration value of the sample in the instrument. Put in the next sample for determination. If not, press the "ESC" button to return to the main menu.    

3. Samp Meas XX . X X mg/L  storage A=X .XXXX   T=XXX.X%

(I) Calibrate Curve

 The Instrument can save 20 standard curves. There is at least one standard curve in the instrument before the actual determination of samples.The standard curve can be calibrated by curve calibration.

1. Move the cursor to the "Cal. Curve" function and press the ENTER key one the main menu interface.

IV. Cal. Curve 1、Item select        2、Unit select 3、Wavelength select  4、Light intensity select 4、Tube select       5、Decimal digit 6、Enter calib

The instrument will enter to calibration state after select depends on the prompt (light intensity select 03),

IV. Cal. Curve > Enter Calib Item   Standard value   Absorbance   1    0000.00

  2. Align the marked line of the pre-treated colorimetric tube with the reticle on the disc and insert it into the colorimetric hole of the analyzer. At this time, the instrument displays the blank standard value. Press the “Enter” button and the instrument displays the absorbance value, press the "Enter" button to enter the calibration of the next sample.

Item   Standard value   Absorbance 2       0000.00

3. The pretreated sample No. 1 colorimetric tube is aligned with the engraved line on the disc, inserted into the colorimetric hole of the analyzer, and the standard value of the standard solution is input by the key button, press "ENTER” button. Display the absorbance value, press the "ENTER" button, the instrument enters the calibration of the No. 2 sample.

Item  Standard value     Absorbance  2     000.05           0.XXX

4. Repeat the above operation, respectively calibrate the remaining standards until all the standards have been calibrated (and press the “ENTER” button to finish the calibration. The instrument automatically calculates and displays the standard curve equation of the calibration. Press “ENTER” to save the curve inside of the instrument.

R=0.XXXX C=XXXX.XX*A+XXX.XX Ｉ=00

   Remarks: If the calibration error is found during the calibration process, press the “ESC” button to return the function selection state.

(III) System setting

The instrument have bellow 5 function setting

1. Clock setting:  press “ENTER” button, the instrument is displayed in the first place for the year, month and date of xx.xx.xx format, use the numeric key to change and press “ENTER” button to confirm. If no need then press “ESC” key.

2. Backlight time: The instrument displays in xx minutes and xx seconds. Use the numeric keys to change and press the “ENTER” button to confirm.
3. Timing setting: Change with the numeric keys, press “ENTER” to confirm.
4. Adjust contrast: adjust the contrast of the display.
5. Timed shutdown: When the instrument does not operate the keyboard, it will automatically shut down after reaching the set time. Use the numeric keys to make changes and press the "ENTER" button to confirm.

IIV Make Up The Reagent

Unless other instruction, the reagents used in this method are analytical grade, water should be distilled water or equivalent pure water. The instrument is calibrated to working curve, the standard solution can be dispensed.

1. Chlorine free water (prepared according to GB7479-87) or fresh distilled water
2. Residual chlorine standard solution: Weigh 0.1550 g of potassium dichromate dried to constant weight at 120 °C and 0.4650 g of potassium chromate dried at 120 °C, dissolved in potassium chloride-hydrochloric acid buffer solution, and diluted. Up to 100mL. This solution is equivalent to 10 mg/L of residual chlorine.
3. Potassium chloride-hydrochloric acid buffer solution: Weigh 3.7 g of potassium chloride dried to constant weight at 100-110 °C, dissolve with pure water, add 0.56 mL of hydrochloric acid (equivalent to 1.19 g/mL), and use pure water. Dilute to 1 L
4. Residual chlorine reagent: Randomly distributed, stored at 2-4 °C.

(VV) Operation steps:

(1)  Sample Testing

Pipette 25mL of distilled water (blank) or sample clear liquid into the two cleaned special colorimetric tubes, pipette 1.25mL of residual chlorine reagent sample tube, cover and shake. And colorimetric within 1min. If test total residual chlorine, the color is measured after 10 minutes. 

(2). Calibrate Curve

Curve 001(0~2mg/L): Retain the residual chlorine standard (2mg/L) 0, 2.50, 6.25, 12.50, 25.00mL in 5 dedicated colorimetric tubes, and make up to 25ml with chlorine-free water (corresponding residual chlorine values: 0, 0.20, 0.50, 1.00, 2.00mg / L), cover and shake on the instrument for curve calibration.

Curve 002 (2 ~ 10mg / L):
First, absorb the residual chlorine standard (10mg/L) 0, 5.00, 12.50, 20.00, 25.00mL in 5 dedicated colorimetric tubes, and make up to 25ml with chlorine-free water (corresponding residual chlorine values: 0, 2.00, 5.00 , 8.00, 10.00mg / L), cover and shake on the instrument for curve calibration.

IVV. Attention

1. Under normal circumstances, the correlation coefficient r of the standard curve should be above 0.990. If the r value of the standard curve is less than 0.990, it indicates that there is a problem with the standard preparation or the colorimetric operation is not standardized. It should be carefully analyzed and excluded one by one.
2. In order to ensure the accuracy of the measurement, the tube and cover of the digestion tube should be fixed and marked with the serial number.
3. Since the cover of the colorimetric tube is a threaded tooth, it is necessary to rinse it with a large amount of water to ensure cleanliness, so as not to affect the measurement result.
4. The colorimetric tube must be kept clean during color comparison. Avoid touching the light-transmissive surface with the hand. Before the colorimetric tube is placed in the colorimetric hole, if there is a solution hanging on the outer wall of the tube, wipe it with a soft cloth to avoid zero drift and corrosion of the instrument.
5, the instrument should be placed in a dry and ventilated place, while avoiding direct sunlight. When not in use for a long time, the colorimetric tube should be wiped clean and placed outside the machine to ensure the inside of the machine to dry and protect the optical components.
6. If the light-transmitting part of the colorimetric tube is scratched, affecting the measurement result, it should be replaced in time.

IIV Packing List

Item	Name	Unit	Quantity	Remarks
1	Main Mechine	set	1
2	Special Reagent	set	1
3	Colorimetric Tube	pc	3
4	Host charging power 9V	pc	1
5	User Manual	pc	1
6	Products Certification	pc	1
7	Warranty card	pc	1