Why does the letter e appear on the tonometer?

Hello everyone! I continue to summarize and post in a condensed form my experience in electronics repair. I present my Top 10 most common malfunctions of tonometers, which was born as a result of accidental repairs of medical equipment and communication with other Masters. I won’t say that I’m a great specialist in this area, but I came across some things and successfully fixed them. Let's start the rating. The locations of malfunctions of tonometers and blood pressure meters are sorted by the frequency of occurrence of the malfunction.

Correct pressure measurement

To measure blood pressure, you need to put a special cuff on your arm.

It should be 1-2 centimeters above the inner bend of the elbow. The cuff must fit the person in size. It shouldn’t put too much pressure on your hand, but it shouldn’t “hang” on it either. After this, the air is pumped with a special rubber bulb, independently or with outside help. After this, the pressure will be known.

Enter your pressure

Avoiding errors in readings when measuring pressure

Sometimes the tonometer can give incorrect data, so you should always monitor its accuracy. First of all, you need to know that there are several types of devices:

Mechanical tonometer. It is more difficult for them to measure pressure - this should be done by a doctor or a person with very good vision and hearing, who can accurately recognize the pulse in the headphones and the desired indicator on the dial.
Electronic or automatic blood pressure monitor. This is a modern device that everyone can use - you just need to use it correctly and it will display the pressure on the screen.

It is impossible to say which of these devices is more accurate. If used correctly, they will both show the correct indicator. But in both cases errors are possible. An electronic device will most likely malfunction if the battery charge is low. It is also impossible to obtain the correct result if the bulb, electronic unit or cuff is faulty. Calibration of the mechanical apparatus is also necessary. To avoid mistakes, before measuring blood pressure, you should refrain from drinking alcohol, coffee and strong tea, smoking, and physical activity. You cannot talk or take your pulse when you are nervous. To obtain accurate readings, it is better to measure your pulse in the morning and evening three times, with breaks of 5-10 minutes. The lowest number will be the most accurate.

Repairing a holey cuff

If the problem is bleeding air, then you need to find the location of the gap. When it is located directly on the cuff, it does not have to be replaced; it can be repaired. How to repair a leaky blood pressure cuff:

If the hole is small and the cuff is strong and unworn, then you can seal it with a hot glue gun.
You can glue a piece of rubber patch or other suitable material onto the gap with rubber cement.
Take a strip of thick aluminum and bend it in half. Push the damaged area between them and clamp it with metal, help yourself with pliers. Cover this place with glue.

When air escapes at the factory soldering site, it can be vulcanized with a soldering iron at 180 degrees. It is important to remember that repairing a cuff is cheaper than replacing it, but it will not last too long after the intervention. Therefore, be prepared to replace this element.

Setting up a tonometer at home

There are several tips on how to test the mechanism for serviceability at home. There is a special installation that shows a certain pulse and breathing of a person, which it simulates. The tonometer is calibrated according to these data. But such an installation is very expensive and not everyone can afford it at home.

The second way is to connect two blood pressure monitors to one cuff, one of which will be precisely adjusted by a medical equipment specialist.

A reference tonometer can be set up at a pharmacy, after which you can calibrate your equipment using this data. An accurate device is necessary in the house, because its indicators can help to draw attention to the problem in time. It is necessary to check the equipment for malfunctions, and also always ensure that the pressure is measured correctly.

Why does the tonometer show different pressure? Users often ask about this when buying a new electronic device. It also happens that it shows different blood pressure (BP) if you measure it several times in a row. It turns out there are many reasons for this.

Why does the tonometer show the pressure incorrectly?

Tonometers are special medical devices that measure blood or eye pressure. In the latter case, the device is called a pneumotonometer. Such devices are an indispensable attribute of doctors. However, today blood pressure measuring devices are successfully used at home by many people, especially those suffering from hypertension and heart disease. A tonometer is even recommended for them, because patients must always keep their blood pressure under control in order to avoid complications caused by increased blood pressure. Tonometer readings are recorded as two measurements, for example, 120/80 mm Hg. Art. What do these numbers mean? This is the different pressure created in each of the two phases of the heart. The first reading is the highest blood pressure pumped by the heart. In our example, it is 120 - it is called systolic. The second reading is minimal. It is observed in diastole, when the heart relaxes, fills with blood, and then pushes it out. This “lower” pressure is referred to as diastolic.

Stages of recovery

procedure for receiving equipment, performing diagnostics and troubleshooting

Carrying out diagnostics

Free diagnostics of the device verbally or on site within 15 minutes.
The device must be left for comprehensive diagnostics.

Price negotiation

We agree on the cost and timing of repairing the device before starting work
When there are no spare parts, more problems are identified - we coordinate

Recovery

The device is being repaired at a service center.
Device repairs
usually take up to 7 days, in difficult cases up to 25 days.

Issuance and verification

The repaired device is checked and tested.
A “Certificate of Work” is issued with a guarantee for the work performed
of the device is possible .

The automatic tonometer responds to the following factors:

The sensitive sensor even reacts to air movement. You must behave calmly, not talk, keep your back straight. The tonometer cuff attached to the arm should be at the level of the heart. If you remove all interference and follow the instructions, the result will be correct. If you need to get a more accurate result, you can take measurements three times with the necessary break between them. After this, it is important to derive the arithmetic average. We must remember: the first indicator and the last may differ due to the artery getting used to compression or any involuntary movement, so triple measurements will provide more accurate data. We must remember that a decrease, as well as an increase in pressure beyond the normal range, is an alarm signal. It is necessary to find out the cause by contacting a cardiologist.

Very often, tonometers may not produce results at all or show incorrect results, as well as show different pressures for various technical reasons: they forgot to insert the batteries; the device is not used correctly; low-quality batteries that quickly fail. In order for electronic blood pressure monitors to work well, it is necessary to change the batteries on time. It is advisable to use only ALKALINE LR batteries for blood pressure monitors. They are more energy-intensive and guarantee a long service life, which is from 200 to 400 measurement cycles. Here, the word cycle means 2 – 3 times a day. Regardless of the manufacturer, LR batteries will ensure the operation of the tonometer for 4 – 6 months. When the tonometer is turned on, the display is tested, and if the device shows a symbol that indicates insufficient power, this means that the batteries are running low - it’s time to take care of new batteries. In addition to errors associated with measuring blood pressure with a device and technical reasons, different pressures can be completely physiological. It is worth remembering that active movements, stress, even sneezing and coughing increase blood pressure. This is a natural reaction and does not require medication. Blood pressure increases for a short time, and if you repeat the measurements a little later, the values will decrease significantly.

Free diagnostics

About the features of free diagnostics

To find out the cause of the malfunction, the approximate time frame for work to restore functionality and the cost of eliminating defects, you can simply send the device for diagnostics . To do this, simply bring (look up the address) ( get directions on Google or Yandex ) the faulty equipment for diagnostics at the service center

Why is diagnostics free ? Sometimes a specialist needs to disassemble the device in order to understand the complexity of the proposed work to restore the functionality of your tonometer . This is necessary to announce the cost of repairs and the timing of the work performed.

About urgent repairs at the service center

Urgent repair of the AED tonometer on site within 20-30 minutes is possible. If the entire process supposedly does not take more than 10 minutes, including disassembling and assembling the device. Urgent repairs are carried out at the discretion of the specialist, taking into account your request. The customer can wait until the end in the service center waiting area.

Why leave equipment in service?

Your AED is waiting for its turn , because we are diagnosing/repairing laptops of other customers.

A specialist needs time to assess the complexity of work to restore the functionality of equipment and to find faults at the modular or component level.

You also need to find serviceable spare parts in stock at the service center or check their availability with the supplier.

About receiving equipment at the service center

When accepted for diagnostics, at the Repair service center, a “ Device Acceptance Certificate ” is issued. Upon completion of the repair work, a “ Certificate of Completion ” is issued with a guarantee for the services performed.

If you decide to refuse to carry out repair work to restore the functionality of the device, then you need to familiarize yourself with the “ Regulations for refusing to carry out work ”

Error correction

Errors may occur when using the tonometer. Some of them you can fix yourself. If this does not work for some reason, disassembling the device yourself is highly not recommended.

Firstly, without knowledge of the features of this device, you can only aggravate the situation. Secondly, after opening the tonometer and damaging the factory seals, the free warranty period of service is automatically canceled.

The table shows the most common errors and methods for eliminating them.

Type of error	Causes	Correction Methods
Flashing heart sign	Heart rate too high	Remove the device from your wrist, wait 10-15 minutes, and then measure your blood pressure again. If the situation repeats, then most likely the indicators are correct. In this case, you need to consult a doctor.
E E Snowflake symbol	The cuff is full of air	You need to remove the device from your hand, turn it off, and then turn it on. Next, you should measure your blood pressure again.
E 78 Snowflake symbol	The cuff is not securely fastened or there was movement of the arm during measurement	Turn off the device, turn it on, measure blood pressure again.
Er 25	The symbol “E” with any code indicates some kind of malfunction in the device.	You need to contact the service center.
Indicators are too low or, conversely, excessively increased	This error can occur for several reasons:

1. The cuff is not fastened correctly.

2. The hand with the device is not at heart level.

3. There were movements or conversations during measurements.

4. The arm is overextended.

Note.

Blood pressure readings may change throughout the day. As a rule, this is not related to the operation of the device. Changes in blood pressure depend on the time of day, weather conditions, as well as the physical and moral state of a person.

Types of devices

As a rule, device repair consists of changing the component unit. Why do you need to buy a new mechanism and replace the broken one with it? For example, it is impossible to inflate the cuff with air. This means that the pumping check valve in the bulb has broken. It is pointless to change only the valve; you need to replace the entire assembly, along with the tubes.

Electronic and semi-automatic machines are several times more expensive than a mechanical device. These types of devices do not have very frequent malfunctions. What often happens:

malfunctions in the mechanism itself;
absence or delay in displaying indicators;

Problems in displaying indicators

It is better to fix serious breakdowns at a service center, because a warranty card is issued for repairs, and until it expires, it is prohibited to carry out repairs on your own. You can change the bulb, cuff, and batteries yourself; the warranty card does not apply to them.

Storage and care

If you do not adhere to the rules for storing and caring for the tonometer, then the device is unlikely to last long. The more carefully you follow all recommended measures, the longer the measuring device will last.

Do not expose the tonometer to impacts, falls or direct sunlight for a long time.
Do not immerse the device in water or give it to children.
If the tonometer is not used for a long time, the batteries must be removed from it.
To avoid damaging the monitor and cuff, store the device in a special case.

If the device or cuff is dirty, do not use alcohol-based products, solvents, alkaline liquids, etc. for cleaning. It is best to wipe the monitor and cuff with a soft cloth (or slightly damp).

“Please help me understand the situation! — a letter to the editor of “Web Journalist” arrived the other day. — My mother is already 79 years old. Her blood pressure often “jumps.” I have been thinking about buying an electronic blood pressure monitor for a long time. Last week I finally decided. So what would you think? The first impression is that the thing is stylish, comfortable and very necessary. But... The tonometer is shamelessly “lying”! As soon as the cuff was placed on the mother's wrist, he showed 178/135. Horror! Everyone at home was seriously alarmed. I had to call an ambulance...

The doctors arrived, took out a regular tonometer with a bulb, and put a cuff on my shoulder. The pressure turned out to be… 125/90! They measured him again, and again... Everything was normal! Why, then, the readings of an electronic device (by the way, produced by a well-known Japanese one? The doctor just shrugged his shoulders... The next day I went to the pharmacy to exchange the device. But they assured me that everything was in order. They say that we carried out the measurements incorrectly. Strange ... Tell me what to do in such a situation? And is there a special service in Minsk that would check the accuracy of tonometers.”

The question is, of course, interesting... And very relevant! Today, about 15-20 models of tonometers of various types are sold in shops and pharmacies in Minsk. These are not only traditional “pears” with a phonendoscope and a dial gauge. In recent years, imported “automatic machines” have come into fashion. They are produced by AND, Microlife, Marshall, Nissei, Omron, etc. The measurement process, at first glance, will not cause any particular problems. Just press a button and the tonometer will do everything itself and display the result on the LCD display. Comfortable? Certainly! But it turns out that not everything is so simple!…

Do-it-yourself tonometer repair: step-by-step master class - Electrician

1st place – loss of tightness of the tonometer cuff

If there is a loss of tightness in the pressure circuit in your tonometer, then with a high probability the “Err Cuf” error will appear on the screen of the automatic tonometer. Translated from English, cuff means cuff, so it is logical that the Err Cuf error is an error in the tightness of the cuff.

If your tonometer gives such an error, then first of all you need to check the connections between the cuff and the compressor. To do this, you need to remove the cuff. Let's look at how to do this using the AND UB-403 wrist tonometer as an example.

How to disassemble the ANDUB-403 automatic wrist blood pressure monitor

When turned on, this blood pressure meter shows zero.
Then the cuff is inflated, but it is interrupted and the Err Cuf error appears on the display.
We turn the AND UB-403 tonometer sideways and see a plug that needs to be removed by prying it off with a thin slotted screwdriver or an awl.
On the other side of the case, remove the same plug.
This is what these cuff mounting plugs look like.
After this, we remove the cuff of the AND UB-403 tonometer and see the connection points of the pipes from the compressor to the cuff - there are two of them.
In these places, desealing and air leakage may occur, so we carefully inspect and clean the rubber seals of the tonometer pipes and cuff.
Let's try to put everything back together in reverse order.

If the cuff error remains, you need to check the cuff itself for cracks.

This is usually done visually.

The rubber cuff of the blood pressure monitor can be repaired by gluing a patch to the air leak. To learn how to patch and repair a cuff, see the video below using the example of a Microlife tonometer cuff.

How to seal a tonometer pad

If the cuff of your tonometer is intact, then you need to coat the joints with sealant or replace the sealing rubber bands of the cuff, if you can find them.

It happens that the air supply becomes unsealed inside the device. In this case, you will have to disassemble the tonometer and eliminate microcracks or change dried rubber bands.

If you do not understand how to disassemble the tonometer, then I advise you to watch the following video on how to properly disassemble AND UB 201 .

2nd place – segments of numbers on the tonometer display disappear

Another part of the disease is the detachment of the cable of the LCD screens of tonometers, as a result of which segments of numbers and letters may not be displayed on the display.

What do the numbers on the blood pressure monitor mean?

After measuring the pressure, numbers are displayed on the tonometer screen - indicators of pressure (upper/systological and lower/diastolic) and heart rate. All home blood pressure monitors have the same sequence of this data, regardless of the manufacturer.

Let us recall the norms of pressure and heart rate indicators with age correlation.

Heart rate - pulse

To obtain correct data, the pressure is measured three times on one arm with an interval of one minute. Some modern tonometers have the function of independently determining the average value calculated from three pressure measurements.

When measuring pressure, it is important to follow the rules:

The wrist tonometer is worn at a distance of 1 finger from the hand.
The Velcro strap is fixed so that there is no pinching of the hand.

The cuff tonometer is attached to the arm at a distance of two fingers from the elbow bend so that the elastic tube passes through the center of the palmar surface of the hand;
During the measurement, you must sit at a table - your hand should lie on a flat surface in a relaxed state, and the cuff should be at heart level.
The cuff is secured with Velcro without squeezing or excessive loose space.

While measuring blood pressure, after pressing the button, it is forbidden to talk, move, move your arms, or clench your fists. Feet are on the floor; you cannot cross your legs.

latest comments

UA 777 BLOOD PRESSURE METER FAULTS

. Cured it myself! A tonometer is a device used to measure blood pressure (See Blood pressure) in the arteries (see And they decided to throw away the disabled veteran. But then I turned up. I looked at the label, model AnD UA-777, made in Japan. The blood pressure meter may show erroneous results, if shortly before the measurement the patient is most in demand is the shoulder tonometer AND UA-777, produced by this company. Why the tonometer does not show pressure:

possible tonometer errors. Understanding the cause of the malfunction is quite simple if you know the features of measuring pressure with a specific device. automatic tonometer, cuff 22-32 cm, power adapter Medical equipment at home experts ERR cuf - this is a tonometer error AND UA-777 connection How to correctly measure blood pressure. My favorite Tonometer AND UA-777. Don't know which blood pressure monitor to choose?

Omron or AND, then this is the place for you!

Yes, because blood pressure is one of the main parameters of human health!

In the online store med-magazin.com.ua, when purchasing such a device, they will issue you a warranty and tell you where to go in case of problems. Doctors advised how to measure blood pressure yourself. The locations of malfunctions of tonometers and blood pressure meters are sorted by the frequency of occurrence of the malfunction. After removing and installing batteries, same problem. Device AND UA-777. Ua 777 blood pressure meter malfunction - PROBLEM NO MORE! Electronic tonometer AD UA 777 Repair of automatic OMRON tonometer and adapter. Tonometer repair The tonometer does not show pressure T on portall.zp.ua - video. Here are the instructions for the tonometer AND UA-777. You can view and download this instruction manual for free. Instructions for use in Russian, suggested Order a spare part Order a repair. Why did the meter stop working:

does not release inflated air from the cuff and, accordingly, does not give readings. tonometer electronic pressure meter. Repair of tonometer AND UA 777 no air bleeding when pressure changes - Duration:

26 Vladimir Marochko 873 views. Yes, also the 777th. Stupidly, I bought a new tonometer when the old one behaved the same way, and accidentally tried the old tonometer with a new cuff - everything works great. So give it a try. Detailed instructions “AnD UA-777 Tonometer” in PDF format. User manual “Tonometer AnD UA-777”. Review. Reviews 0. For people suffering from hypertension, it is very important to regularly measure blood pressure. Previously, this required going to a clinic or using a mechanical device, which is not always convenient. In case of malfunction or breakdown, you can buy it separately. Ua 777 blood pressure meter malfunction

- 100 PERCENT! Price is about 300-400 rubles. When you turn on the ad ua 777 tonometer, it pumps up the pressure to 170. This way you can only measure normal blood pressure. Advantages:

measures pressure quickly and accurately Disadvantages:

How can I check the device?

Nowadays electronic devices are the most popular because they have an affordable price. They do not require special skills from the user to measure blood pressure. Even older people, women and teenagers can cope with it. They are easy to turn on and off once the test is complete.

But measurement accuracy plays a major role. Electronic and automatic devices often malfunction. For this reason, constant checking of the tonometer is necessary to avoid mistakes.

If your friends or neighbors have another device whose accuracy has been verified, you can use it to control accuracy and settings. The second such device will help you check the accuracy of your tonometer readings and identify errors in measurements.

Some are of the opinion that it is better to carry out measurements with mechanical instruments. But modern automatic devices perform their tasks perfectly. Some of the high-quality tonometers are devices from Omron.

The parallel connection method helps to evaluate each of the two devices and check the tonometers for accuracy.

For proper verification, follow the following algorithm:

devices are connected in parallel for simultaneous measurements;
double testing is carried out for objective assessment, control tests;
If necessary, check individual parts of the device.