UVmastercare A2 The Anti Covid19 UV-C System User Guide
- June 13, 2024
- UVmastercare
Table of Contents
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.