Sartorius MD8 Airport User manual

1000045639
Operating Instructions
Original Operating Instructions
MD8 Airport
16757
Air Sampler

2 Operating Instructions MD8 Airport
Contents
Contents
1 About these Instructions...............................................4
1.1 Validity ..........................................................4
1.2 Accompanying Documents ..........................................4
1.3 Target Groups.....................................................4
1.4 Symbols Used .....................................................4
1.4.1 Warnings in Operating Instructions ............................4
1.4.2 Other Symbols..............................................5
2 Safety Precautions ....................................................6
2.1 Intended Use......................................................6
2.2 Significance of these Instructions ....................................6
2.3 Proper Working Order of the Device ..................................6
2.4 Electrical Equipment ...............................................7
2.4.1 Damage to the Device’s Electrical Equipment....................7
2.4.2 Working on the Device’s Electrical Equipment . . . . . . . . . . . . . . . . . . .7
2.4.3 AC Adapter and Power Cord ..................................7
2.5 Conduct in an Emergency...........................................7
2.6 Accessories, Consumables, and Spare Parts.............................7
2.7 Personal Protective Equipment ......................................7
3 Device Description ....................................................8
3.1 Device Overview...................................................8
3.1.1 Adapter ...................................................8
3.1.2 Filter Holder ...............................................8
3.1.3 Air Inlet ...................................................9
3.2 Air Sampling......................................................9
3.2.1 Filtration Method ...........................................9
3.2.2 Impaction Method ..........................................9
3.3 Controlling the Air Flow Rate........................................9
4 Operating Design ....................................................10
4.1 Operating Display.................................................10
4.2 Menu Structure ..................................................11
4.3 Navigating the Menus.............................................11
5 Installation..........................................................12
5.1 Equipment Supplied...............................................12
5.2 Selecting an Installation Site .......................................12
5.3 Unpacking.......................................................12
6 Getting Started......................................................13
6.1 Connecting the AC Adapter ........................................13
6.2 Charging the Battery..............................................13
6.3 Calibration and Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
7 System Settings......................................................14
7.1 Switching on the Device ...........................................14
7.2 Opening the Service Menu .........................................14
7.2.1 Setting the Menu Language .................................14
7.2.2 Setting Automatic Switch-off Time ...........................14
7.2.3 Setting the Contrast of the Operating Display ..................14
7.2.4 Calibration and Adjustment .................................15
7.3 Closing the Service Menu ..........................................15
7.4 Parameter List ...................................................15

Operating Instructions MD8 Airport 3
Contents
8 Operation ...........................................................16
8.1 Setting up the Device .............................................16
8.2 Inserting a Filter Holder or Culture Media Plate .......................16
8.2.1 Inserting a Filter Holder.....................................16
8.2.2 Inserting a Culture Media Plate ..............................17
8.3 Checking the Battery Status........................................17
8.4 Setting Measurement Parameters ...................................17
8.4.1 Setting Sampling Volume ...................................17
8.4.2 Setting Air Flow Rate.......................................18
8.5 Starting an Operation .............................................18
8.5.1 Starting the Device with a Preset Sampling Volume .............18
8.5.2 Starting the Device with a User-defined Sampling Volume .......18
8.6 Manually Stopping Operation ......................................19
8.7 Displaying Information During Operation.............................19
8.8 Removing a Filter Holder or Culture Media Plate.......................19
9 Cleaning and Maintenance............................................20
9.1 Cleaning ........................................................20
9.2 Disinfecting .....................................................20
9.3 Maintenance Schedule ............................................21
10 Malfunctions ........................................................22
10.1 Error Messages ...................................................22
10.2 Malfunctions ....................................................22
11 Decommissioning ....................................................23
11.1 Decommissioning the Device .......................................23
12 Storage and Shipping ................................................23
12.1 Storage .........................................................23
12.2 Returning Device and Parts ........................................23
13 Disposal.............................................................24
13.1 Information on Decontamination ...................................24
13.2 Dispose of Device and Parts ........................................24
13.2.1 Information on Disposal ....................................24
13.2.2 Disposal ..................................................24
14 Technical Data.......................................................25
14.1 Dimensions and Weight ...........................................25
14.2 Ambient Conditions at the Installation Site ...........................25
14.3 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
14.3.1 AC Adapter ...............................................26
14.3.2 Battery...................................................26
14.4 Power Consumption ..............................................27
14.5 Acoustic Emission.................................................27
14.6 Approved Consumables............................................27
14.7 Approved Cleaners and Disinfecting Agents...........................27
15 Accessories and Consumables .........................................28
15.1 Accessories ......................................................28
15.2 Consumables.....................................................28
16 Sartorius Service.....................................................28
17 Conformity..........................................................29
17.1 EU Declaration of Conformity ......................................29

4 Operating Instructions MD8 Airport
About these Instructions
1 About these Instructions
1.1 Validity
These instructions are part of the device. These instructions apply to the device in the
following version:
Device Type
MD8 Airport 16757
1.2 Accompanying Documents
t In addition to these instructions, observe the following documentation:
− Gelatin membrane filter with filter holder instructions
− Culture media plate instructions
1.3 Target Groups
These instructions are intended for the following target groups. The target groups
must possess the knowledge listed.
Target group Knowledge and responsibilities
User The user is responsible for operating the device and for the
associated work processes. They understand the hazards
which may arise when working with the device and know
how to prevent them.
They have been trained in the operation of the device.
The training is carried out by the operating engineer/
laboratory manager or by the operator of the device.
Operator The operator of the device is responsible for compliance
with safety requirements and workplace safety regulations.
The operator must ensure that all persons who work with
the device have access to the relevant information and are
trained in working with the device.
1.4 Symbols Used
1.4.1 Warnings in Operating Instructions
WARNING
Denotes a danger with risk that death or severe injury may result if it is not avoided.
CAUTION
Denotes a hazard that may result in moderate or minor injury if it is not avoided.
NOTICE
Denotes a danger with risk that property damage may result if the risk is not
avoided.

Operating Instructions MD8 Airport 5
About these Instructions
1.4.2 Other Symbols
tRequired action: Describes actions which must be carried out.
yResult: Describes the result of the actions carried out.
[ ] Text inside brackets refer to operating elements.
Figures on the Operating Display
The figures on the operating display of the device may deviate from those in these
instructions.

6 Operating Instructions MD8 Airport
Safety Precautions
2 Safety Precautions
2.1 Intended Use
The MD8 Airport is a battery-operated portable air sampler that operates using
filtration and impaction methods. It is used to determine microorganisms or
concentrations of viruses in the air.
The device must be used with an adapter and a suitable filter or culture media plate
(for suitable filters and culture media plates, see Chapter “14.6 Approved
Consumables”, Page 27).
The device is not suitable for continuous operation. The device is intended exclusively
for use in accordance with these instructions. Any further use beyond this is
considered improper.
If the device is not used properly: The protective systems of the device may be
impaired. This can lead to unforeseeable personal injury or property damage.
Operating Conditions for the Device
Do not use the device in potentially explosive environments. The device may only be
used indoors.
The device may only be used with the equipment and under the operating conditions
described in the Technical Data section of these instructions.
Modifications to the Device
You may not modify or repair the device or make any technical changes. Any
retrofitting or technical changes to the device are only permitted with prior written
permission from Sartorius.
2.2 Significance of these Instructions
Failure to follow the instructions in this manual can have serious consequences,
e.g. exposure of individuals to electrical, mechanical, or chemical hazards.
t Before working with the device: Read the instructions carefully and completely.
t If these instructions are lost: Request a replacement or download the latest
version from the Sartorius website (www.sartorius.com).
t The information contained in these instructions must be available to all
individuals working on the device.
2.3 Proper Working Order of the Device
A damaged device or worn parts may lead to malfunctions or cause hazards which
are difficult to recognize.
t Only operate the device when it is safe and in perfect working order.
t Observe the maintenance intervals (see Chapter “9.3 Maintenance Schedule”,
Page 21).
t Have any malfunctions or damage repaired immediately by Sartorius Service.

Operating Instructions MD8 Airport 7
Safety Precautions
2.4 Electrical Equipment
2.4.1 Damage to the Device’s Electrical Equipment
Damage to the device’s electrical equipment, e.g. damaged insulation, can be
life-threatening. There is a danger to life from contact with live parts.
t If the electrical equipment of the device is defective, immediately cut off the
power supply and contact Sartorius Service.
t Keep live parts away from moisture. Moisture can cause short-circuits.
2.4.2 Working on the Device’s Electrical Equipment
Only Sartorius Service personnel may work on or modify the electrical equipment of
the device. The device may only be opened by Sartorius Service personnel.
2.4.3 AC Adapter and Power Cord
Serious injury can result, e.g. from electric shocks, if an unsuitable/inadequately
dimensioned power cord or unsuitable power supply is used.
t Only use the original power cord and power supply.
t If the power supply or power cord must be replaced: Contact Sartorius Service.
Do not repair or modify the power supply or power cable.
2.5 Conduct in an Emergency
If there is immediate danger of personal injury or equipment damage, e.g. due to
malfunctions or dangerous situations, take the device out of operation immediately.
t Disconnect the device from the power supply.
t Have any malfunctions repaired immediately by Sartorius Service.
2.6 Accessories, Consumables, and Spare Parts
The use of unsuitable accessories, consumables, and spare parts can affect the
functionality and safety of the device and have the following consequences:
− Risk of injury to persons
− Damage to the device
− Malfunction of the device
− Device failure
t Only use Sartorius accessories, consumables and spare parts.
t Only use accessories, consumables, and spare parts that are in proper working
order.
2.7 Personal Protective Equipment
Personal protective equipment protects against risks arising from the materials being
processed.
t If the workplace or the process in which the device is being used requires
personal protective equipment: Wear personal protective equipment.

8 Operating Instructions MD8 Airport
Device Description
3 Device Description
3.1 Device Overview
Fig.1: MD8 Airport (without adapter)
Pos. Designation Description
1 Operating display Used for displaying and setting parameters.
2 Air outlet opening Air is expelled from here.
3 Rigid fins on backplate Resting surface when operated vertically.
4 Rubber feet Resting surface when operated horizontally.
5 Manufacturer’s ID label Position of the manufacturer’s ID label.
6 Power socket For connecting the AC adapter (power supply).
7 Air inlet Takes in the air for analysis. Holds the adapter
for the filter holder or culture media plate.
3.1.1 Adapter
A filter holder adapter or culture media plate adapter is required when using the
device. The adapter holds the filter holder or culture media plate.
3.1.2 Filter Holder
The (single-use) filter holder is a ready-to-use unit consisting of a gelatin membrane
filter and a holder.
1
2
3
4
56
7

Operating Instructions MD8 Airport 9
Device Description
3.1.3 Air Inlet
The air inlet opening holds the adapter for the filter holder or culture media plate.
Fig.2: Air inlet (with adapter and filter holder, and with adapter and culture media plate)
Pos. Designation Description
1 Adapter and filter holder Required for air sampling using the
filtration method.
2 Adapter and culture media plate Required for air sampling using the
impaction method.
3.2 Air Sampling
3.2.1 Filtration Method
In the filtration method, a defined volume of air is sucked in through gelatin
membrane filters. Microorganisms and viruses are trapped on the filters. Since
the filters contain no substances on which cultures can grow, they need to be
transferred to a suitable culture medium and incubated once the air sampling is
complete. Following incubation, the number of culture-forming units per cubic
meter of air (cfu/ m3) can be calculated from the number of colonies growing on
the culture medium in relation to the volume of air sampled.
3.2.2 Impaction Method
In the Andersen Principle impaction method, a defined volume of air is sucked
through a strainer, accelerated and passed across a culture media plate. Due to
inertia, the microorganisms present in the air cannot follow the diverted air flow
and are thrown onto the culture media plate. Following incubation of the culture
media plate, the colonies that have grown on the culture medium are counted in
terms of culture-forming units (cfu/ m3).
3.3 Controlling the Air Flow Rate
The air flow rate is constantly measured by means of a fan wheel anemometer with
opto-electronic scanning, and is digitally controlled.
12

10 Operating Instructions MD8 Airport
Operating Design
4 Operating Design
4.1 Operating Display
Fig.3: Operating display
Pos. Symbol Designation Description
1 Status display Displays current operating data or system
settings of the device.
2Operating status − Switches the device on.
− Starts/ stops an operation.
3Increase value Increases the value of a displayed parameter.
4Decrease value Decreases the value of a displayed parameter.
5Menu display Opens a menu.
1
2345

Operating Instructions MD8 Airport 11
Operating Design
4.2 Menu Structure
Level 1 Level 2 Description/reference
Air sampler
battery
Displays battery status when not in
operation.
Volume
F-rate
Displays the previously set parameters.
Sampling volume
default
Specifies the sampling volume for the
next operation. Volume can be selected
from a list of preset values.
Air flow rate
L/min.
Specifies the air flow rate for the next
operation.
Sampling volume
Manual
Specifies the sampling volume for
the next operation. The value can be
adjusted in 5-liter steps.
Service program
Software V. 4.0
Displays the software version of the
device.
Language Changes the menu language of the
operating display.
Switch-off time Changes the automatic switch-off time
of the device.
LCD contrast Changes the contrast of the operating
display.
Calibration
F-act. K=
Displays the calibration parameter:
− F-act.: Current actual frequency of
the device fan wheel
− K value: Air flow rate correction
4.3 Navigating the Menus
Procedure
t To switch to the next menu entry: Press the [Menu display] button.
t To change a parameter value: Press the [Decrease value] or [Increase value]
buttons.
t To start or stop an operation: Press the [Operating status] button.

12 Operating Instructions MD8 Airport
Installation
5 Installation
5.1 Equipment Supplied
Product Quantity
MD8 Airport 1
AC adapter with country-specific power plug 1
Operating instructions 1
Calibration certificate 1
5.2 Selecting an Installation Site
Procedure
t Make sure that the following conditions are met at the installation site:
Condition Characteristics
Ambient conditions − Suitability tested (see Chapter “14.2”,
Page 25).
Setup surface − Stable and level surface
− Sufficient space for the device (for space
requirements, see Chapter “14.1 Dimensions
and weight”, Page 25)
− Sufficient load bearing for the device (for
weight, see Chapter “14.1 Dimensions and
weight”, Page 25)
Access to parts relevant to
operation
Convenient and safe
5.3 Unpacking
Procedure
t Unpack the device.
t If the device is stored temporarily: Observe the storage information (see Chapter
“12.1”, Page 23).
t Install the device at the intended installation location.
t Keep all parts of the original packaging, e.g. to return the device.

Operating Instructions MD8 Airport 13
Getting Started
6 Getting Started
6.1 Connecting the AC Adapter
t NOTICE Risk of damage to the device as a result of unsuitable power supply!
t Use the original Sartorius AC adapter.
t If no suitable AC adapter is available: Contact Sartorius Service.
t Connect the power cord to the AC adapter.
t Plug the AC adapter into the power socket and screw it in.
6.2 Charging the Battery
Requirements
The AC adapter is connected to the device.
Procedure
t WARNING The use of defective power cords may lead to serious injury!
Check the power cord for damage, e.g. cracks in the insulation.
t Check that the power cord has the correct power plug for the installation site.
t If required: Contact Sartorius Service.
t Connect the AC adapter to the power supply.
6.3 Calibration and Adjustment
Sartorius recommends that the device be calibrated on site before first
commissioning. Calibration of the device is necessary for air sampling to work
correctly.
Calibration and adjustment must be carried out by Sartorius Service.

14 Operating Instructions MD8 Airport
System Settings
7 System Settings
7.1 Switching on the Device
Procedure
t To switch the device on: Press the [Operating status] button.
y The device is ready for use.
y The device switches itself off automatically (see Chapter “7.2.2 Setting Automatic
Switch-off Time”, Page 14).
7.2 Opening the Service Menu
Changes to settings in the Service menu are saved automatically.
Procedure
t To open the Service menu: Press and hold the [Menu display] button, and within
one second press the [Operating status] button. Release both buttons together.
y The device is now in the Service program.
7.2.1 Setting the Menu Language
Procedure
t To switch to the “Language” menu: Press the [Menu display] button.
t Select the language you require by pressing the [Increase value] or [Decrease
value] buttons.
7.2.2 Setting Automatic Switch-off Time
The device switches itself off automatically when it reaches the specified switch-off
time.
Procedure
t To switch to the “Switch-off time” menu: Press the [Menu display] button.
t Select the switch-off time you require by pressing the [Increase value] or
[Decrease value] buttons.
7.2.3 Setting the Contrast of the Operating Display
The contrast of the operating display must be set within the visible range (for setting
range, see Chapter “7.4 Parameter List”, Page 15).
Procedure
t To switch to the “LCD contrast” menu: Press the [Menu display] button.
t Set the contrast of the operating display you require by pressing the [Increase
value] or [Decrease value] buttons.
Service program
Software V.4.0
Language?
German
Switch-off time
300sec.
LCD contrast
50

Operating Instructions MD8 Airport 15
System Settings
7.2.4 Calibration and Adjustment
Settings in the “Calibration” service menu must be carried out by Sartorius Service.
7.3 Closing the Service Menu
Procedure
t To close the Service menu: Press the [Menu display] button repeatedly until the
launch screen of the Service menu is displayed.
t Press the [Operating status] button.
y The device has now exited the Service menu.
7.4 Parameter List
Main menu
Parameter Configuration values Explanation
Air flow rate 10 L/min When using gelatin membrane
filters
20 L/min
30 L/min
50 L/min
125 L/min For use with culture media
plates only
Sampling volume
automatic settings
25 L
50 L
100 L
250 L
500 L
750 L
1000 L
Sampling volume
manually adjustable
10– 2000 L Adjustable in 5 L steps
Service menu
Parameter Configuration values Explanation
Language German
English
French
Spanish
Switch-off time 10 – 1000 sec.
LCD contrast 0 – 110 Adjustable in single units
Sartorius
Airport MD8

16 Operating Instructions MD8 Airport
Operation
8 Operation
8.1 Setting up the Device
The device can be operated in a horizontal or vertical position.
Procedure
t Notice A blocked air inlet or air outlet can damage the device.
t Ensure sufficient distance between air intake and objects in the immediate
vicinity (for required distance, see Chapter “14.2 Ambient Conditions at the
Installation Site”, Page 25).
t Do not cover the air let and outlet with any objects.
t To operate horizontally: Stand the device upright on its rubber feet.
t To operate vertically: Stand the device up on the two rigid fins on the backplate.
8.2 Inserting a Filter Holder or Culture Media Plate
8.2.1 Inserting a Filter Holder
Air sampling using the filtration method requires the use of a filter holder and
filter, such as a gelatin membrane filter. Unsuitable filters, and filters from other
manufacturers, may have characteristics that are not appropriate for the device,
such as being too dense. This can cause processes to abort.
Requirements
The suitability of the filter holder and filter has been checked (for suitability, see
Chapter “14.6 Approved Consumables”, Page 27).
Procedure
t Attach the filter holder adapter to the opening of the air inlet (for suitability of
the adapter, see Chapter “15.1 Accessories”, Page 28).
t Gently and without applying pressure, insert the filter holder into the adapter.
If the filter holder is inserted too firmly: It can under some circumstances be
difficult to remove.

Operating Instructions MD8 Airport 17
Operation
8.2.2 Inserting a Culture Media Plate
Air sampling using the impaction method requires the use of suitable culture media
plates.
Requirements
The suitability of the culture media plate has been checked (for suitability, see
Chapter “14.6 Approved Consumables”, Page 27).
Procedure
t Attach the culture media plate adapter to the opening of the air inlet
(for suitability of the adapter, see Chapter “15.1 Accessories”, Page 28).
t Gently and without applying pressure, insert the culture media plate into the
adapter. If the culture media plate is inserted too firmly: It can under some
circumstances be difficult to remove.
8.3 Checking the Battery Status
To prevent an operation being aborted due to the battery charge being too low, it is
recommended that the battery status should be > 40% before starting an operation.
Requirements
The device is switched on.
Procedure
t Press the [Menu display] button.
y The battery status is displayed.
8.4 Setting Measurement Parameters
Changes to the measurement parameters are saved automatically. The measurement
parameters of the last operation will remain stored after the device is switched off.
8.4.1 Setting Sampling Volume
The sampling volume determines what volume of air passes through the filter or over
the culture media plate during an operation. Preset values can be selected or
user-defined values set.
Procedure
t To use the device’s default values for the sampling volume: Switch to the
“Default sampling volume” menu by pressing the [Menu display] button.
t Select the desired value, e.g. 1000 L, by pressing the [Increase value] or [Decrease
value] buttons.
t To set user-defined values: Switch to the “Manual sampling volume” menu by
pressing the [Menu display] button.
t Select the desired value, e.g. 2000 L, by pressing the [Increase value] or [Decrease
value] buttons.
Air sampler
Battery=100%
Sampling volume
default=1000l
Sampling volume
Manual=2000l

18 Operating Instructions MD8 Airport
Operation
8.4.2 Setting Air Flow Rate
The air flow rate determines how many liters of air per minute pass through the
filter or over the culture media plate during an operation. For an operation with a
culture media plate, an appropriate air flow rate must be set (for parameters, see
Chapter “7.4 Parameter List”, Page 15).
Procedure
t Switch to the “Air flow rate” menu by pressing the [Menu display] button.
t Select the desired value, e.g. 125 l/min, by pressing the [Increase value] or
[Decrease value] buttons.
8.5 Starting an Operation
8.5.1 Starting the Device with a Preset Sampling Volume
Requirements
− The sampling volume has been set.
− The air flow rate has been set.
Procedure
t Notice Electrostatic charge can cause the operation to abort. Only operate the
device in battery mode.
t To start the operation: Press the [Operating status] button.
y The device switches to operating mode:
y The operation starts.
y The operating display shows the current air flow rate and the set sampling
volume.
y Once the set sampling volume has been reached:
y The device stops the operation automatically.
y The operating display shows the air flow rate and the set sampling volume of
the last operation.
8.5.2 Starting the Device with a User-defined Sampling Volume
Requirements
− The sampling volume has been set.
− The air flow rate has been set.
Procedure
t Notice Electrostatic charge can cause the operation to abort. Only operate the
device in battery mode.
t Open the menu.
t Switch to the “Manual sampling volume” menu by pressing the [Menu display]
button.
t To start the operation: Press the [Operating status] button.
y The device switches to operating mode:
y The operation starts.
y The operating display shows the current air flow rate and the set sampling
volume.
y Once the set sampling volume has been reached:
y The device stops the operation automatically.
y The operating display shows the current air flow rate and the set sampling
volume of the last operation.
Air flow rate
L/min.=125
Volume 2000L
F-rate 125L/min
Sampling volume
Manual=2000l
Volume 2000L
F-rate 125L/min

Operating Instructions MD8 Airport 19
Operation
8.6 Manually Stopping Operation
Procedure
t Press the [Operating status] button.
y The device stops the operation.
8.7 Displaying Information During Operation
Procedure
t To display the remaining time required for the operation: Press the
[Menu display] button.
y The remaining time is displayed.
t To display the battery status: Press the [Menu display] button.
y The battery status is displayed.
8.8 Removing a Filter Holder or Culture Media Plate
Requirements
The measurement process is complete.
Procedure
t Remove the filter holder or culture media plate from the adapter.
t If no further operations are to take place: Remove the adapter.
Time remaining
47 Sec.
Air sampler
Battery=97%

20 Operating Instructions MD8 Airport
Cleaning and Maintenance
9 Cleaning and Maintenance
9.1 Cleaning
Requirements
The operation has been completed.
WARNING
Moisture on live components can cause electric shock!
Allowing liquids to penetrate inside the housing can cause serious injury and damage
to the device.
t Do not immerse the device in liquid.
t Prevent liquid droplets from forming during cleaning.
Procedure
t Disconnect the device from the power supply.
t CAUTION There is a risk of injury from contact with substances that are
harmful to health! If the device has come into contact with substances that are
harmful to health: Contact Sartorius Service.
t NOTICE Corrosive gases can damage the device. If the device has come into
contact with corrosive gases: Contact Sartorius Service.
t NOTICE Corrosion or damage to the device due to unsuitable cleaning agents!
t Do not use corrosive, chloride-containing, and aggressive cleaning agents.
t Do not use cleaning agents that contain abrasive ingredients, e.g. scouring
agents, steel wool.
t Do not use solvent-based cleaning agents.
t Wipe off the housing with a slightly damp cloth. For more severe contamination,
use a mild soap solution.
9.2 Disinfecting
Requirements
The operation has been completed.
WARNING
Moisture on live components can cause electric shock!
Allowing liquids to penetrate inside the housing can cause serious injury and damage
to the device.
t Do not autoclave the device.
t Do not immerse the device in liquid.
t Do not spray the device with disinfectant; simply wipe clean.
t Prevent liquid droplets from forming during disinfection.