UVmastercare A2 The Anti Covid19 UV-C System User Guide

User guide
Version A2 IoTCo sa
Avenue du Pré Aily, 24
4031 Angleur
info@uvmastercare.com

Introduction

1.1 Background
The Covid-19 pandemic is creating a new situation for health care practitioners who see patients in their offices. The disinfection of the environment in which successive patient procedures are performed has become infinitely more  critical than before. This is particularly true for dental practices, where “open-mouth” procedures cause light particles containing potentially pathogenic microorganisms to be released into the air from the patient. After the procedure, the  air is therefore inevitably filled with aerosols and droplets made up of all kinds of substances, including a certain concentration of coronavirus if the patient is infected. These substances are deposited on the surrounding surfaces, which  are then potentially contaminated.
The aim of UV-MasterCare is to rapidly destroy all organic particles in the air, on the walls and on the surface of objects in the dental practice where the operation took place, including the dreaded coronaviruses. The system disinfects  between operations on two successive patients. This phase, which must take place outside the human occupation of the practice, lasts only a few minutes. The procedure therefore allows the practice to maintain a reasonable rate of operation.
1.2 Principle
Infectious agents contained in the air and deposited on surfaces are eliminated by the effect of a particular ultraviolet radiation, UV-C. As a reminder, ultraviolet radiation, or UV, is a type of light that extends the spectrum of visible light  on the short light wavelength side. The wavelength is a fundamental characteristic of the light wave, and the shorter the wavelength, the more energy the photons that make up light carry.
For visible light, the wavelength is also what determines the colour we perceive when the radiation reaches our eye. The colour spectrum ranges from red to violet, with corresponding wavelengths of 780 to 400 nanometres. The nanometre, abbreviated to “nm”, is one billionth of a metre. Light with a wavelength below 400 nm, known as ultraviolet light, is invisible to us. However, it does have an effect on us because, being more energetic, it can cause damage to  the organic molecules we are made of.
However, the danger of UV-C to health should be tempered by the fact that the rate of penetration into living tissue is very low. This can be usefully discussed in the following section:
https://www.prevent.be/fr/banque_de_connaissance/rayons-uv-risque-invisible- et-souvent-sous-estim%C3%A9 
It is the ability to affect the molecules of biological beings that is at the basis of the disinfecting power of ultraviolet rays. Scientific studies show that DNA molecules easily absorb UV at a wavelength of 260 nm.
Subjected to a certain dose of such radiation, the molecules break down. This is how viruses, which are a kind of microscopic reservoir of RNA (close to DNA), are killed. In the UV spectrum, which ranges from 400 to 100 nm, there is a  variety of variants that are called UV-A, UV-B, UV-C and extreme UV. The UV rays that most effectively destroy the DNA or RNA of coronaviruses are of the UV-C type.
There are dedicated lamps that produce ultraviolet light in the region of the spectrum of interest. These lamps are tubular and have some similarities to the fluorescent lighting tubes we are familiar with, often (albeit inappropriately)  referred to as neon tubes. The lamps that make up the UVmastercare system are called “amalgam lamps” because their operation involves the presence of mercury amalgam in their structure. It is not useful to understand the details of  how these lamps work, except that their emission spectrum has a peak centred on 254 nm, making them perfect virus killers.
The principle of UVmastercare can then be stated as follows:
After placing one or more germicidal lamp(s) inside the cabinet, these are switched on away from any human presence for a sufficient time to ensure that the air and surfaces are reached with a dose of UV-C radiation sufficient to eliminate any coronaviruses that may have been present.

1.3 Constitution

The main element of UVmastercare is a wheeled stand supporting a metal housing with a vertically arranged tubular UV-C lamp. This stand is approximately 1.5 metres high. Depending on the size and shape of the dental practice, several lamps are required to ensure disinfection within a reasonable time. A UVmastercare system consists of between one and four stands.
This set of stands includes a Master Stand. Other stands, if any, are subordinate to him and are called “Slave Stands”. The introductory model of the UVmastercare consists of a Master Stand and a Slave Stand with a total of two UV-C  lamps and is suitable for parallelepiped-shaped cabinets with a maximum dimension of around 4 metres.
The Master Stand is connected to a standard power outlet with a three-meter power cord. Slave Stands, if any, are daisy-chained from the Master Stand by dedicated power cords.
The Master Stand housing contains a control panel with the buttons and displays needed to operate the equipment.
The unit is delivered with instructions on how to arrange the stands in the room and which disinfection time to choose according to its size.
The UVmastercare system has an optional remote control box (called “remote control box”) that allows interaction with the stands when they are out of sight behind the closed cabinet door.

1.4 Disinfection procedure
The preliminary step consists of placing the stand(s) inside the cabinet and connecting them to a power outlet by adopting the Slave Stands connection chain.
It is imperative that the cabinet be equipped with a door that discourages access during disinfection.
The control panel, shown opposite, allows you to configure the duration of a disinfection according to the dimensions and configuration of the cabinet. The operator starts the disinfection process by means of a key switch, similar to the  one used to start a car.
Once the disinfection process is started, the operator is given 20 seconds to exit the room and close the door. During this time, the germicidal lamps remain off. The Master Stand is able to detect if the operator is nearby thanks to built-in  presence detectors.
When the start-up delay has elapsed, and provided that the operator is detected as having left the room, all the stands have their UV-C lamps switched on. A buzzer is activated continuously during disinfection. A red light is lit on the  control panel as well as on the remote control box. A countdown timer, which displays the remaining disinfection time from the set value, is visible on the control panel and on the remote control unit.
It is understood that the operator will take care to leave the Remote box out of the cabinet.
Danger!
At the end of the disinfection period, the germicidal lamps turn off, the buzzer is silent, and the indicator lights turn green.
The operator may interrupt the disinfection sequence at any time, for any reason. The Master Stand is equipped with a clearly visible emergency stop switch. Also, the remote control box allows for an abrupt stop.

Safety instructions

2.1 Ultraviolet radiation
Danger !
Ultraviolet radiation
The use of UVmastercare calls for precautionary measures due to the hazardous nature of UV-C radiation. Exposure of humans or pets to the radiation emitted by germicidal lamps should be avoided when they are in operation.
The operation of germicidal lamps can be seen as follows:

• Permanent switching on of the red indicator lamp on the MasterStand.
• Audition of the buzzer in continuous tone.
• Information given by the remote control box (see section Erreur ! Source du renvoi introuvable. et Erreur ! Source du renvoi introuvable.)
• As a last resort, violet light emitted by the lamp.

2.2 Presence of mercury
Danger !
Presence of mercury in germicidal tubes
Just like fluorescent lighting tubes, UVmastercare germicidal tubes contain mercury in a gaseous state.
Mercury is harmful.

• If, by accident a germicidal tube is broken, the room should be immediately ventilated for a few minutes to remove the mercury vapour. For tube replacement, follow section 8.3, Replacing a Germicidal Lamp.
• Recycling a germicidal tube at the end of its life is done using the same procedure as for fluorescent light tubes.

2.3 Heat release
The quartz tube is dangerously hot after disinfection.
The protective tube of the germicidal lamp remains dangerously hot within 15 minutes after a disinfection operation. Do not go near it.

2.5 Start key

Always remove the ignition key when the unit is not in use.
Without the key, the equipment cannot be switched on, which is a safety feature that prevents it from  being switched on by an unauthorised person. This requires that the key is managed responsibly by the operators.

2.4 Electrical connection
Turn off the main switch when connecting the power cables.
The device must be connected to a 230 V/16 A socket outlet in accordance with the regulations.

The procedure for connecting or disconnecting the unit is given in Chapter 5, “Installation and Start-Up”

2 .6 Thermal protection

Allow the system to cool down if the error occurs.
During prolonged use in high ambient temperatures, the internal temperature of the unit may be too high  to ensure reliable and safe operation.

In this case, the system goes into a thermal protection mode as explained in section 6.5, “Error Modes”.

2.7 Emergency stop
If accidental circumstances bring a person into the vicinity of the device being disinfected, that person is required to stop operation immediately by pressing the emergency stop button, as explained in Section 6.2.2, “Emergency Stop  Button”.

2.8 Presence detectors
The equipment is equipped with presence detectors that prevent or interrupt operation if a human body is in the vicinity.
Should the operator suspect that these detectors are not working properly, he shall refrain from using the system and immediately notify the relevant technical service.

2.9 Lamp protection tube

Gloves must be worn when handling the lamps and their protective tube

The germicidal lamp is surrounded by a quartz tube that is transparent to UV-C rays and must remain perfectly clean. Fat contamination of the skin compromises this transparency. Therefore, touching the tube with bare hands should be  avoided at all costs. The device is delivered with a pair of gloves that must be used when working on the tube for disassembly or cleaning.

If the tube is accidentally touched, it must be cleaned with a soft cloth and a degreasing solvent such as isopropyl alcohol.

2.10 Handling of the equipment

Wearing gloves is recommended when handling the unit

A good way to avoid contamination of the lamp protection tube by inadvertent contact is to always wear protective gloves when handling the device.

Description

3.1 Master Stand

| Metal case| | Emergency stop button
---|---|---|---
Base with wheels| Human presence detectors
Germicidal lamp with its protective tube| Detachable AC power cord
Lamp mounting ring with its protection tube| Power supply inlet socket with main switch
Handling handle| Socket for the power supply of the first Slave Stand
Peg for storing the power cord| Antenna
Control panel| |

3.2 Slave Stand
The Slave Stand has several elements similar to those of the Master Stand.

| Metal case| | Handling handle
---|---|---|---
Base with wheels| Pat Peg for storing the power cord
Germicidal lamp with its protective tube| Non-detachable power cord
Lamp mounting ring with its protection tube| Socket for the power supply of the next Slave Stand in the chain

3.3 Control panel

| Key switch
---|---
Two-digit display
« Minus » push button
« Plus » push button
Green light (system in working order)
Orange light (arming)
Red light (disinfection)

3.4 Remote box
The Remote Box is an optional accessory to the UVmastercare system.

| Push button (Interrupt)
---|---
Progress indicator
Text display
Hanging recess

The Remote box is under development at the time of writing this manual. The information provided about it is preliminary and will be refined in a later edition.

Role of control systems

4.1 Main switch
The power supply inlet socket has a main switch which must be switched on to operate the appliance.
4.2 Key switch
The key switch has three successive positions symbolized as follows:

| The operator can only insert or remove the key when the ignition switch is in this position.
---|---
| In this stable position, the system is ready to start, just like when you “turn on the ignition” of a car.
| Putting the key in this position starts the process. This is a temporary position: the switch returns to the  position under the effect of a spring as soon as the operator releases the key.

4.3 Witnesses
The three lights , and have different ignition speeds:

• The green light illuminates continuously, indicating that the system is in working order.
• The orange light flashes.
• The red light is either on continuously or flashing.

There are six possible situations in which the warning lights may illuminate, symbolized as follows:

| All three lights are off.
The system is not powered or inactive.
---|---
| The green light is on by itself.
The system is on rest.
| The green light is on and the orange light is flashing.
The system is in the arming phase, prior to disinfection.
| The green light is on, as is the red light.
The system is being disinfected.
| The green light is on and the red light is flashing.
Disinfection has been suspended.
See section 6.3, “Temporary suspension of disinfection”.
| The green light is on and the orange and red lights are flashing.
A special situation has occurred, reported as a code on the display.

4.4 Two-digit display
The two-digit display can be in different situations depending on the circumstances:

| When the system is on rest, the display shows the number of minutes programmed for disinfection.
---|---
| The display is off.
| When the system is disinfecting, the display shows the remaining minutes.
| Under special circumstances, the display shows an error code.
See section 6.5, “Error Modes”.
| When the system is in the arming phase, the display shows the remaining seconds.
| When the unit is switched on, the display shows the functional version code.

4.5 Push buttons
The push buttons and are used to program the disinfection time. They can only be used when the  system is at rest. The left (“Minus”) button decreases the time by one minute, the right (“Plus”) button increases it. Disinfection  can be programmed to last between 1 and 15 minutes.

4.6 Emergency stop button
When the operator presses the emergency button, the system stops operation, turning off the germicidal lamps if necessary, eliminating any danger to the operator. In this particular state, the display shows the error code .
After pressing, the button remains locked at the bottom. To return to normal operation, the emergency button must be released by turning it clockwise one notch.
4.7 Buzzer
The Master Stand incorporates a buzzer that emits a clearly audible tone that can be continuous or interrupted at a rate of one beep per second.

| |
---|---|---
No dial tone.| Continuous tone sounds.| Discontinuous tone sound.

4.8 Human presence detectors
Detectors use PIR technology (Passive InfraRed sensor), sensitive to the infrared rays emitted by the M9 human body. They inform the system of the presence of a person close to the equipment.

Installation and start-up

5.1 Positioning the stands
The stands, whether Master or Slave, are mobile thanks to the wheeled legs and. The operator positions them within the dental practice so that the UV-C radiation reaches the entire volume of the practice and the surfaces of all objects  present.
As stated in the safety instructions in section 2.9, “Lamp protection tube”, it is forbidden to touch the germicidal lamp protection tube or with bare hands. Therefore, when moving the stands:

Wearing gloves is recommended when handling the unit

5.2 Connecting the cables
The operator must ensure that the main switch on the electrical supply socket of the Master Stand is M11 in the off position when plugging or unplugging the power cables.
Turn off the main switch when connecting the power supply cables

5.2.1 Connecting the Master Stand
The operator plugs the detachable power cord M10 from the Master Stand into a standard household power outlet on one side, and the power supply inlet on the other side. The electrical circuit to which the M11 power outlet belongs must supply 230 V and be protected by a 16 A GFCI. The socket outlet must be provided with an earth connection

Sequence of system states

6.1 Canonical operation
After switching on the power supply via the main switch on the socket M11, the operating sequence of the UVmastercare follows a logic with four successive states:

Inactivity| | System status when the key switch is in position .
• The germicidal lamps are off.
The next intended action is to turn the ignition key to the key switch position , which will switch to the Rest state.
---|---|---
Rest| | System status when the key switch is in position .
• The germicidal lamps are off.
• The programmed disinfection time is displayed.
• This time can be changed using the push buttons  and .
The subsequent action is to turn the key on the switch to the position .
Armament| | System status after the key switch  has been momentarily turned to P1 position .
• The contactor has returned to the position .
• The germicidal lamps are off.
• The seconds countdown is displayed, starting at 20.
• The operator is required to leave the room as soon as possible.
At the end of the second countdown, the system switches to Disinfection.
Disinfection| | System status after the arming countdown is complete.
• The key switch  is in position .
• The germicidal lamps are lit, sterilization is taking place.
• The disinfection minute countdown is displayed, starting at the previously programmed value.
After the minute countdown, the system returns to the Rest state.

The quartz tube is dangerously hot after disinfection.
Danger!
Ultraviolet radiation

6.2 Interruption of operation
6.2.1 Key-operated switch
At any time when the switch is in position , the operator can return it to the position . This has the effect of returning the system to the Inactive state, and therefore stopping the germicidal lamps if they were on.
6.2.2 Emergency stop button
At any time except in the Inactive state, the operator can press the emergency stop button. This has the M8 immediate effect of placing the system in a so- called Error state which is characterized as follows:

6.2.2 Emergency stop button
At any time except in the Inactive state, the operator can press the emergency stop button. This has the immediate effect of placing the system in a so- called Error state which is characterized as follows:

Error| | The emergency stop button is locked at the bottom.
• The switch is in position .
• The germicidal lamps are off.
• Any countdown in progress is interrupted.
• The error code is displayed.
The operator must release the emergency stop button and then exit the error state by  returning the key switch to the position.
---|---|---

6.2.3 Push button of the Remote
When the system is in Armament state, pressing the push button of the Remote box interrupts the R1 arming countdown and returns the system to the Rest state. This is a way to avoid switching on the equipment.
When the system is in the Disinfection state, pressing the push-button on the Remote box turns off the germicidal lamps and starts the suspension mechanism described in Paragraph 6.3 below. This allows the operator to temporarily interrupt disinfection from outside the cabinet. This allows the operator to temporarily stop disinfection from outside the cabinet, e.g., inside the cabinet, and then restart disinfection for the remaining time.
Pressing the push button on the remote box has no effect outside these two situations.
6.2.4 Human presence during disinfection
If a human presence is detected by the detectors during Disinfection, the germicidal lamps are switched M9 off immediately and the system starts a suspension mechanism described in Paragraph 6.3 below. This event therefore has the  same effect as pressing the push-button on the Remote box.
6.3 Temporary suspension of disinfection
The suspension mechanism intervenes in the Disinfection state by pressing the push button on the remote box or by detecting the presence of people in the dental practice.
The germicidal lamps are switched off immediately, and the system goes into a Suspension state which is characterized as follows:

Suspension| | System status after a suspension action.
• The switch  is in position .
• The germicidal lamps are off.
• The remaining disinfection time is displayed.
• This time can be modified with the and  push buttons, allowing to lenghten or shorten the  remaining disinfection time if disinfection is continued.
The subsequent action foreseen is to turn the key on the contactor to the position to restart an  Armament period, followed by a Disinfection phase that will last the time displayed.
---|---|---

The operator can of course interrupt the disinfection process completely by returning the key switch to the position .
6.4 Programming the disinfection time
The programming time is programmed to the minute when the system is in the Standby state, as explained in paragraph 6.1, “Canonical Operation”. The recommended time for a specific practice is set as described in Section 8.4, “Disinfection Time”.
The set time is stored in the memory, even when the unit is switched off. Thus, if the installation room has not been changed, the operator does not have to reprogram the disinfection time each time the unit is switched on.
However, any change in duration that the operator may make during a disinfection suspension, as defined in paragraph 6.3 above, is not stored.

6.5 Error modes
Certain abnormal circumstances place the system in an Error state, which is characterized as follows:

Error| | • The switch is in position .
• The germicidal lamps are off.
• An explanatory error code appears on the display .
To exit this error mode, the operator must return the key switch to the position .
---|---|---

The error code that then appears on the two-digit display can be:

| The unit has activated the thermal protection due to internal overheating. For safety reasons, operation  was interrupted.
We recommend waiting half an hour before resuming disinfection. If the internal temperature is still too high, the error will recur.
---|---
| The unit detected that one of the M3 or S3  germicidal lamps or was defective.
See section 8.3, “Replacing a germicidal lamp”.
| The M8  emergency stop button was pressed by the operator.
See Section 6.2.2, “Emergency Stop Button”.

Using the Remote box

The Remote box is under development at the time of writing this manual. The information given about it in this manual is preliminary and will be refined in a later edition.

The Remote box has an indicator R2, a push button R1 and a text display R3.
The indicator is a red ring that lights up gradually.
7.1 Progress in armament
When the system is in the Armament state, the indicator is off at the beginning of the phase. Its circumference becomes increasingly illuminated during the 30-second countdown, leading to full illumination at the end of the arming  phase. In addition, the indicator flashes throughout the arming phase.
7.2 Disinfection progress
When the system is in the Disinfection state, the indicator is fully illuminated at the beginning of the phase. The illuminated section fades during the minute countdown, leading to complete shutdown at the end of the disinfection period.
7.3 Use of push button
The push button is active when the system is in the Armament or the Disinfection state, as explained in section 6.2.3, “Remote Box Push Button”.
7.4 Text display
The display shows relevant information depending on the system status. The contents will be specified in a later edition of the manual.

Technical procedures

8.1 Functional version
The operation of the UVmastercare system is governed by an internal computer program which may change from time to time. The functional version code is an indication of the version of this internal program, which appears at power- up as explained in section 5.3, “Power-up”. An example of code announced by the P2 display is .
The version number in this manual corresponds to this functional code. The operation of a device that displays a specific code is correctly described by the version of the manual referenced by the same code.
During an exchange with the manufacturer’s technical service, the operator may be asked to communicate this functional version code.

8.2 Assembly after delivery
Unpacking and assembly of the equipment is carried out on delivery by the expert technical agent of the UVmastercare manufacturer.
8.3 Germicidal lamp replacement
To replace a lamp, the operator should contact the technical expert of the UVmastercare manufacturer.
Gloves must be worn when handling the lamps and their protective tube.
Danger!
Mercury in germicidal tubes

8.4 Disinfection time
The analysis of the different cabinets or UVmastercare is carried out by the manufacturer’s expert technical agent at the time of delivery of the equipment or on call. It is through him that the disinfection times prescribed for each room  are established.
8.5 Cleaning the unit
The cleaning of the device will be done according to the prescriptions of use for any device present in a dental practice.
Particular attention must be paid to quartz tubes M3 and S3 that do not suffer any physical contact, in accordance with the safety instruction in paragraph 2.9, “Lamp protection tube”.

Gloves must be worn when handling the lamps and their protective tube.
Wearing gloves is recommended when handling the unit.

References

• Rayons UV: risque invisible et souvent sous-estimé | Prevent.be

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