ELGA laboratory pure water machine common faults and treatment methods

1, Prima machine common fault

I. Prima water production is too slow

Prima 7/15/30 water production is much slower than before, and the water in the water tank will take a long time to fill up; the reasons for this failure are as follows:

1. The pretreatment equipment (CHN01) filter core outside the main unit needs to be replaced (white PP cotton and blue activated carbon); observe the color of white PP cotton. If it has turned yellow and black, it needs to be replaced; generally change it every 3 months. .

2. The pre-treatment filter (LC140; Pre-treatment) in the main unit needs to be replaced.

3, RO membrane is too dirty, there is a slight blockage; need to do the whole pipeline (including RO system) disinfection, cleaning, you need to use ELGA special disinfection tablets.

4. The RO discharge solenoid valve is faulty and cannot be closed normally. Observe the waste line of the machine. When the machine is just started (RO flushing stage), a large amount of waste water will be discharged. If the water is produced normally, there will be almost the same waste water discharge. , it means that the waste electromagnetic can not be closed normally, need to clean the waste electromagnetic valve or replace the waste electromagnetic valve.

5. The source water booster pump is faulty on the left side of the machine. When the machine is normally turned on, touch the booster pump by hand. If there is no vibration, check the booster pump power supply or replace the booster pump.

two. Prima can't produce water problems

Prima7/15/30 does not produce water and the storage tank is empty for the following reasons:

1. Check the connection between the float float and the main unit, whether it is loose or not inserted; because the main machine is based on the liquid level control of the water tank to produce water.

2. Incoming water system failure, check the water supply system one by one from the source water; check whether the tap water supply is normal; check whether the water supply of the pretreatment equipment is normal.

3. Check whether the water inlet solenoid valve of the machine is normally switched. The method is: A) When the running key is activated, the sound of the water inlet solenoid valve can be heard. B) During operation, observe the internal pipeline of the machine, whether there is normal water flow.

4. The pre-treatment filter element in the main unit is blocked (LC140; Pre-treatment blocked); LC140 needs to be replaced.

5. The RO membrane is clogged, and the RO membrane fouling and clogging in the main unit will also cause this failure. In the case where the cleaning RO membrane is invalid, the RO column needs to be replaced.

three. Prima produces high water conductivity, >20us/cm

Prima 7/15/30, the water quality of the RO suddenly changed significantly, which was doubled or several times higher than the previous conductivity (20us/cm-100us/cm); the possible reasons are:

1. Factors that exclude changes in the quality of the incoming water, such as: renovation of tap water, contamination of tap water, etc.

2. The LC140 has not been replaced for a long time (more than one year), please replace the LC140.

3, the machine conductivity tester needs to be calibrated or replaced, you can take the sample (pure water) for conductivity detection to compare the machine display value.

4. If the exhaust solenoid valve is blocked or faulty, you need to clean the solenoid valve or replace it; the cause of the fault is explained as follows:

*Prima RO must have concentrated water discharged when it produces water. There will be no discharge. The working principle of Prima exhaust solenoid valve is:

--- When opening, the ball valve is opened and the water is discharged normally; RO has no water;

--- When closing, the ball valve is closed, water is restricted to be discharged through the small hole in the middle of the ball valve, and RO has water production;

The restrictor hole in the middle of the ball valve is very small, and it is also very easy to block. After the blockage, the concentrated water before the RO can not be discharged in time, which causes concentration polarization, and the conductance of the RO water production will increase.

2, Option machine common faults

one. Option R ion column LC141 life shortening problem

The DI column life of all pure water equipment is determined by two factors: the quality of the incoming water and the amount of water used! Option R has a circulation (water tank and main circulation) system; so we must pay attention to the quality of pure water in the water tank, so we must control the quality of pure water in the water tank without increasing the amount of water. The following measures can be taken Effective control of pure water quality:

1. The host RO membrane should be disinfected regularly (it is recommended once every three months) to ensure the quality of RO water production; if the machine RO produces water quality

Poor and cannot be improved by disinfection, the RO membrane column needs to be replaced.

1. Whether the air filter of the water tank needs to be replaced, because the air filter can remove CO2 from the air; prevent the pure water in the water tank and the CO2 in the air. (The effect of CO2 on the quality of pure water refers to the chapter of Classic Machine)

2. If the water tank is polluted, it needs to be cleaned and disinfected. If there is unclean water entering the water tank or the water tank is in a bad environment and pollutes the water tank, then the ELGA manufacturer disinfection tablets should be used to clean and disinfect the water tank.

3. If the water tank cover is tight, if it is not tightly closed, the CO2 in the air will enter.

two. Option water tank leakage problem

The Option system is composed of a main tank and a water tank. The main engine produces water into the water tank. When the water tank is full, the main engine stops producing water. If the float liquid level fails, the damage will be: if the water tank is full, the main engine still produces water, and the water will leak. Above the laboratory floor or other equipment.

In order to prevent water tank leakage damage, the optional water tank is equipped with a safety overflow port, and the overflow port connects the pipeline to the drainage tank. The overflow port is connected to the "check valve" at the back of the water tank. The check valve is opened by pressure (to prevent air from entering the water tank), so the manufacturer recommends: in order to ensure the safety of the check valve, the water tank The lid must be tightened or the water will overflow from the lid of the tank.

Note: Option & Prima tank cover must be tightened! (Applicable to all pure water equipment connected to the tank)

three. Optional pre-filtering CHN01 does not replace the problem for a long time.

  Option series equipment is tap water, and the quality of tap water in different parts of China is different, so in order to protect the host, extend the life of the host's built-in filter (Pre-treatment); we have added CHN01 pre-filter on the outside of the machine. It consists of PP cotton and activated carbon. If the inner surface of PP cotton turns yellow, it must be replaced. When replacing PP cotton and activated carbon, the replacement cycle is about three months; if it is not replaced for a long time, CHN01 PP cotton will become black, and activated carbon will also be ineffective, which will damage the internal consumables of the host.

four. Option Pre-treatment LC140 problems caused by irregular replacement

  Option Pre-treatment LC140 (Pre-treatment) manufacturers recommend to replace it 6 months; because we have installed pre-filter CHN01, LC140 can extend the replacement cycle appropriately; however, if the following conditions occur, it must be replaced:

1. CHN01 is replaced regularly, and the water produced by the machine is obviously slower. If the LC140 may be blocked, it must be replaced.

2. When the machine produces water, the conductivity of the RO produced water is monitored to be high, and the LC140 should be considered for replacement.

3. The life of the DI column of the machine is suddenly shortened. If the LC140 has not been replaced for a long time, it needs to be replaced.

3, Classic machine common faults

How long does the DI column (ion exchange column) last?

The DI column life of all pure water equipment is determined by two factors: the quality of the incoming water and the amount of water used!

1. The quality of the influent water, including the conductivity of the influent water and the CO2 content (the CO2 affects the pH value);

(The factor of CO2 content is: 1ppm of CO2 will increase the conductivity of the influent by 2.33 us/cm)

2. The amount of water used, if there is no unexpected factor, the amount of water used by the user is stable and the change will not be great;

Manufacturers stipulate: In the ideal state, the water intake is 1us/cm, PH=7, and the ultra-pure water DI column produces 56000L;

(ELGA ultra-pure water DI column representative number is: LC182, LC186, etc.)

Assume the situation is as follows:

1. The conductivity of the influent water is 10us/cm, and the CO2 content is 5ppm (PH<7);

The life of ultrapure water DI column = 56000 / (10 + 5 * 2.33) = 2586.6L;

2. The amount of water used is 10L/day;

Ultra-pure water DI column life = 2586/10 = 258 days (10 liters per day is standard)

4, Ultra machine common faults

Ultra influent water consumption problem

The Ultra ultrapure water system has recently found a significant increase in water use; in the absence of a significant increase in water use, influent (bottled water) is quickly consumed, resulting in the following reasons:

1. Ultra has a model with a UF column. The ion column is flushed with about 0.3 liters of water for 20 seconds every six hours, and about 3 liters of water is added for 2 minutes by UF. Therefore, the UF drain line can be connected back to the water tank, saving water and not Affect the quality of water production.

2, the room temperature is too high in summer, if the water temperature exceeds the temperature alarm point set by the machine, the machine will automatically discharge the waste, the purpose is to reduce the water temperature; there is no time limit for this waste discharge until the water temperature meets the requirements; the solution is as follows:

A) Improve room temperature, add air conditioning or ventilation equipment; in addition, pure water equipment should not be exposed to direct sunlight.

B) Reset the temperature alarm parameter of the machine. The highest alarm point can be set to 40 °C (the water temperature will exceed 40 °C, the machine will automatically discharge and cool down)

3. Ultra models have two operating modes: intermittent operation mode and continuous operation mode; normal operation mode is intermittent operation mode; if continuous operation mode is started, the machine will work 24 hours without interruption, due to long-term work, pump It will dissipate heat, causing the water temperature to be too high, and the machine will automatically drain and cool down. The solution is to set the machine to intermittent operation mode.

Ultra resistivity cannot reach 18.2 M Ω .cm

The Ultra ultrapure water system uses a two-column series design with water quality and temperature detection probes at the back of the middle column and the end column. Under normal working conditions, the water quality displayed on the screen is the water quality monitoring value of the end column effluent. If Ultra resistance is found The rate is lower than 18.2 MΩ.cm or the water quality is unstable, and the fluctuation range is large (5MΩ.cm-18.2MΩ.cm fluctuation); the cause of the failure is as follows:

1. Check the water resistance of the middle column (press the left button to switch the display). If the water quality of the middle column is less than 5 MΩ.cm, it means that the middle column (ion exchange column) of Ultra needs to be replaced by placing the end column In the middle position, the new column is placed at the end position.

2. If the intermediate water quality is 18.2 MΩ.cm (stable display), the end water quality cannot reach 18.2 MΩ.cm; please check the ultrafiltration UF. If necessary, UF should discharge air, rinse or disinfect (host disinfection).

3. The water quality probe at the end of the machine needs to be calibrated and needs to be calibrated using factory tools.

4. After the Ultra machine has been disinfected and cleaned, the intermediate water quality is 18.2 MΩ.cm and stable. After 24 hours of operation, the water quality can be stabilized at 18.2 MΩ.cm.

5. If the intermediate water quality and the end water quality are both stable and the display is between 10 MΩ.cm - 17 MΩ.cm, please check the influent water for problems.

6. The air inside the machine enters the air. After the air needs to be removed, the water quality can be stabilized. For the air exhaust method, see the following chapter.

Ultra resistivity is greater than 18.2 M Ω .cm ; the screen has a “U” display

  Ultra ultra-pure water series machines suddenly found that the resistivity is not very stable, the fluctuation range is very large, even greater than 18.2 MΩ.cm; and the icon displayed on the screen is “18.2 MΩ.cm U”; this situation is to change the machine settings. , the "non-temperature compensation" option is selected, so the temperature change will affect the water resistance display; the solution is: in the machine standby state, press the left button to enter the menu option, find the "non-temperature compensation" option, we The requirement is: no choice! (box blank).

Ultra screen reminds you of replacement information

  The pure water equipment produced by ELGA manufacturers meets the requirements of certification bodies such as GMP, GLP, CAP, etc. Therefore, the automatic reminder replacement function is also set for the consumables of the pure water system; if the pure water equipment is used for 6 months or 12 Month, the recommended replacement icon (flashing) will be displayed on the screen, and the sound of the alarm will sound; but this is not a machine failure, just a goodwill reminder; the customer checks the machine's functions, such as: effluent water quality; if the machine is working properly, This alarm message can be cancelled by setting.  

Disinfection box can not automatically run the disinfection program problem

  The Ultra machine has a full-line automatic disinfection function. If the machine is inserted into the sterilization box, but the disinfection program cannot be automatically run or the disinfection program runs to a certain stage and suddenly stops; then the solution is as follows:

1. The program chip of the disinfection box has water and contaminants; it hinders the operation of the program; remove the disinfection box and wipe it with alcohol or a clean cotton cloth, and wipe the host contact that is in contact with the disinfection box chip with a clean cotton cloth.

2. The contact between the host read chip program and the motherboard is loose. You need to open the top cover of the machine and re-plug the contact cable.

3, program problems, host program error, need to initialize the program; the method is: the machine is powered off, press the left button and the middle button at the same time, turn on the power of the host, the screen will display the "000" password identification, press the "check mark" one by one Just fine.

Ultra boot automatically rinses for 30 minutes

The Ultra model program automatically sets the automatic flushing function. The normal working state, the startup flushing time is: 2 minutes and 20 seconds; if the machine is automatically flushed after booting, but the flushing time is 30 minutes, this situation is to change the machine settings. If the option of "influent type" is selected incorrectly, the machine will start different flushing modes according to different influent types; the solution is: in the standby state of the machine, press the left button to enter the menu option and find the "influent type". The option to modify the influent water into SDI water into RO water or DI water; the relevant explanation is as follows:

Choose a different type of influent, The device will initiate different boot flush modes in order to maximize the protection of the machine;

RO from central water or bottled water; conductivity <30μs/cm reverse osmosis water; start flushing for 2 minutes and 20 seconds;

DI from the central water supply or deionized water supply center (RO + DI); resistivity > 1M Ω cm purified water; start flushing 2 minutes and 20 seconds;

Deionized water produced industrially by SDI ; often contains a large amount of organic contaminants; it is rinsed for 30 minutes.

Ultra TOC monitoring cannot display numerical problems

  Ultra (Model: Genetic and Analytic) with TOC monitor, TOC monitors the TOC value of ultrapure water, so the range is: 1-200ppb; if the TOC value of ultrapure water exceeds the detection range, then the screen will not To display the TOC value, wait for the machine to cycle for a period of time, the TOC degrades to the range of the range, the TOC value will be displayed on the screen; if it is cycled for 24 hours, the machine still cannot display the TOC value correctly. The possible reasons are as follows:

1. Check the quality of the influent water. Since the TOC content in ultrapure water is very low (1-10ppb), the TOC value of the influent water is required to be less than 50ppb; if there is a problem with the instrument or equipment entering the water, it will easily lead to ultrapure water. The TOC value is out of range and cannot be displayed.

2, check the disinfection record of the machine, if the pure water equipment has not been disinfected for a long time, and the TOC can not be displayed, you need to immediately disinfect the whole pipeline of the machine, you need to use the ELGA special disinfection tablet CT1.

3. If there is no problem with the quality of the influent water, it is necessary to check the use time of the DI ion exchange column of ultrapure water, even if the resistivity of the ultrapure water is acceptable (18.2 MΩ.cm), if the DI column is used for too long or the use environment is too Poor, then the microbial content in the DI column will exceed the standard, resulting in excessive TOC content; need to replace the DI column.

Indirect water acid causes the failure of DI column

  Ultra-pure water has a lot of water inflow categories. If it is domestic DI water or bottled water without quality confirmation, we should pay attention to the pH of the influent in addition to the conductivity:

It is concluded from the practical experience that if the pH of the influent water is <6, the water quality of the DI column of ultrapure water will drop below 10 MΩ.cm, and the consumption life of the DI column will be accelerated; if the pH of the influent water returns to normal, the water quality Will rise to 18.2 MΩ.cm; however, the DI column may have been damaged and the life will be shortened.

If you encounter such problems, you need to check the conductivity and pH of the ultrapure water influx!  

Ultra ion column into the air treatment method

  Ultra is ultrapure water equipment, the inlet water is secondary or tertiary water, most of the laboratories use bottled water as the influent; be sure to monitor the amount of water in the bottled water and ensure that the inlet of the Ultra is inserted into the water; The bottled water is empty, and the machine normally draws water, and the air enters the inside of the machine (including the DI column); the failure at this time is that the machine cannot produce water, and the resistivity is unstable, very low or the fluctuation range is large; The processing method is as follows:

1. Ensure that the water inlet is normal, open the water intake valve of the machine to take water. In the initial stage, there may be no water coming out. Slowly, water will flow out. Take water for a few minutes to ensure sufficient air discharge, and the machine can be used normally.

2. If the water is taken for a few minutes, there is still no water flowing out; then there may be negative pressure inside the machine, and the DI column needs to be removed for pressure treatment; the operation method follows the following steps:

A) When the machine is running, take water for a few minutes, no water flows out; turn off the power of the machine;

B) Open the front door of the machine and waterproof it inside the machine (water-absorbent paper is placed under the DI column and behind the machine); unplug the DI column, and with the DI column unplugged, there will be a lot of gas and a small amount of pure water. Spill, wipe clean, install back to the DI column, turn the power back on, and take water normally. (When wiping the machine, be careful to wipe the stainless steel iron contacts that are in contact with the DI-pillar chip)

Ultra terminal 0.2um filter leakage problem

   The Ultra machine can be equipped with a 0.2um terminal water filter. If equipped with a terminal water filter, it will leak water during normal water intake. Most of the reason is because the 0.2um terminal filter is screwed into the machine and the front door of the machine is opened. Unscrew the terminal filter; accidental bumping and loosening will occur. The processing method is as follows:

1. Check if the terminal filter is tight. If it is not tightened, please tighten it carefully.

2. Check if the terminal filter is vertical. If there is tilt or offset, please remove the terminal filter and reinstall it.

3. Check if the venting port above the terminal filter is tight. If there is slight water seepage here, please tighten the venting port.

4. If you need to open the front door of the machine to replace the consumables, you must first remove the terminal filter and then open the front door.

Ultra RS232 interface to the computer

   ELGA's ultra-pure water series equipments all have data export processing functions, which can be connected to the computer through the RS232 interface of pure water equipment to realize data output, management, printing and other functions; the specific connection method is:

1. You need to purchase or customize an RS232 cable. The communication protocol of the cable is as follows:

Pin 2 = Receive ------- Pin 3 = Transmit

Pin 3 = Transmit ------ Pin 2 = Receive

Pin 5 = Common -------- Pin 5 = Common

The RS232 cable is connected to the ultrapure water device (9-pin male port) and the other end to the computer (9-pin female port).

2. Open the Microsoft HyperTerminal on your computer: Start - Programs - Accessories - Communications - HyperTerminal; set the parameters as follows:

Baud: 1200 bits / sec (baud rate: 1200 bits / sec)

Data Bits: (8 data bits: 8)

Parity: None (parity: none)

Stop Bit: 1 (stop bit: 1)

Flow control: None (flow control: none)

If you need data transmission, please press the print button on the host screen, the data will be automatically transferred to the computer's HyperTerminal interface.

5, Common faults of Centra machines

I. Water source is a solution for deep well water

   The water intake of CENTRA central water supply equipment is not municipal tap water, but deep well water; then for the water quality characteristics of deep well water, users need to provide “source water report” for deep well water. Manufacturers will focus on the following projects and provide solutions:

1. The content of bicarbonate; the bicarbonate content of deep well water is definitely exceeding the standard, and the solution is to provide a double RO purification system;

2, the total hardness; the total hardness of deep well water is several times the municipal water supply, the solution is to add a large flow softening equipment;

3, PH value; the pH value of deep well water is acid, the solution is to add alkali to the double RO pure water system, mediating PH to a reasonable range;

two. Inlet water pressure low alarm problem (PSI↓)

During the use of CENTRA, if the alarm is frequent: the inlet pressure is low (PSI↓); the alarm icons are as follows:

The reasons for this failure are as follows:

1. If the tap water fails, please check if it stops water?

2, pre-processing failure:

A) The filter core needs to be replaced; the filter core (PP cotton and activated carbon) of the pretreatment softening equipment is replaced once every three months;

B) The pre-treatment booster pump does not work; the booster pump needs to be replaced or repaired

3. The host fails, the host filter LC159 needs to be replaced, and the LC159 is replaced once a year.

three. Host leak alarm problem (Leak)

When CENTRA is running normally, if the alarm: Leak detection (icon flashing), please pay attention to the following factors:

Principle analysis: Leakage alarm probe and water tank gravity float probe are connected in series to the main board TH2, there is an alarm, which will cause the machine alarm Leak detection.

This warning will be reported for the following three reasons:

1. When the machine leaks, the leak alarm probe is shorted and the machine alarms; at this time, the water can be emptied and the leak probe can be blown dry. (The machine needs to be restarted after power off)

2. The water level of the water tank drops during non-working hours; the host can be programmed intelligently. If it is set to not work on Saturday, the machine will automatically enter the intermittent standby mode on Saturday (maintain intermittent cycle) if it is in this non-working time. If there is water in other rooms, the host will think that there is a leak alarm in the pipe network.

Note: Some users connect equipment or instruments between CENTRA's pipe network. If the corresponding equipment has automatic water replenishment function, it may cause the instrument to automatically replenish water during non-working hours, causing CENTRA host alarm.

Solution: A) The water supply valve of the corresponding instrument can be turned off during non-working hours;

B) set the intermittent working mode time, avoiding the working time period of the relevant instrument;

3. When the liquid level of the water tank is higher than 350L, the gravity float probe will also report this alarm; the solution is to discharge the water at the terminal water point to make the host liquid level lower than 350L; at the same time, contact the manufacturer to install the pipe network return solenoid valve upgrade component.