What is the recommended maximum pipe length for the input airflow of the MAS-100 Iso NT or the MAS-100 Iso MH? Answer
For both systems a total pipe lenght of 10 m is specified. The recommended inner pipe diameter should be 22-27 mm and other restrictions like bends and turns should be minimized. Due to the stronger blower of the MAS-100 Iso MH in comparison to the MAS-100 Iso NT longer pipe lengths may be possible but should be tested beforehand.
How is the decontamination pump of the MAS-100 Iso NT or MAS-100 Iso MH to be adjusted? Answer
1. Open the MAS-100 Iso NT/MH Communication & Calibration (C&C) PC Software and login as service user.2. Go to the service menu under the chapter decontamination settings, and set the pump speed on 50% or higher. The decontamination flow displayed on the left side has to be higher than 600mV3. Deactivate the "Activate digital flow guard signal" field and adjust the "alarm threshold for flow guard" approximately 200 mV below the ADC flush flow value4. Perform a functional test by blocking the exhaust of the decontamination path and start a decontamination by pressing the "start decontamination" button in the menu all devices. The error 95 (decontamination flow to low!) must occur after a while. 5. Acknowledge the alarm. The alarm signal will stop and the decontamination pump has been successfully adjusted.
What is the flow rate of the decontamination pump of the MAS-100 Iso NT? Answer
The flow rate of the decontamination pump can vary depending on the length and the diameter of the tubing as well as on the specific installation. The maximum flow rate of the MAS-100 Iso NT under optimal conditions is 4 L/min.
What is the flow rate of the decontamination pump of the MAS-100 Iso MH? Answer
The flow rate of the decontamination pump can vary depending on the length and the diameter of the tubing as well as on the specific installation. The maximum flow rate of the MAS-100 Iso MH under optimal conditions is 8 L/min.
Why does MBV offer special instruments to monitor microbial contamination in isolators and RABS? Answer
The permitted levels of particles and CFU in isolators and RABS are extremely low. This requires special material and cleaning/decontamination procedures.MBV MAS-100 Iso instruments are designed to avoid introducing contamination into these environments while at the same time being able to collect samples in conformance with relevant standards, regulations and guidelines.
Do I have to remove the MAS-100 Iso air sampler during decontamination of the isolator? Answer
No! The MAS-100 Iso base units are installed outside of the isolator. Only the sampling head is within the exposed area. The sampling head is made from stainless steel and fully compatible with the decontamination gas. All MAS-100 Iso instruments from MBV (except RABS) have a special decontamination gas flow path inside of the instrument which is automatically triggered during decontamination and enables decontamination of the sampling head, the tubing/piping and the valves. The separate decontamination gas flow path prevents the sensitive parts (namely the airflow sensor) from damage by the decontamination gas.
What are sampling heads and perforated lids of MAS-100 Iso instruments for isolators and RABS made of? Answer
All MBV manufactured components within the critical isolator/RABS area are made from stainless steel EN?1.4435 (X2CrNiMo18_14_3) according to BN2 (electro polished pharmaceutical quality).Perforated lids can be autoclaved at 121?C for 20 minutes or dry-decontaminated at 180?C for 60min. The complete assembly can be gas decontaminated.
MBV offers perforated lids in aluminum and in stainless steel. Is it possible to use a stainless steel sampling head on a portable instrument or an aluminum sampling head on an isolator instrument? Answer
It is physically possible to switch between aluminum and stainless steel sampling heads for isolator and mobile instruments as the bajonet dimensions are identical.Nonetheless, MBV recommends using the stainless steel head for isolator applications because the aluminum can be damaged by the decontamination gas.Also, wear and tear of the aluminum component increases significantly if it is frequently used with a much harder stainless steel counterpart.
How can I decontaminate the isolator air samplers MAS-100 Iso NT and MAS-100 Iso MH? Answer
All current MBV isolator air samplers products (MAS-100 Iso NT and MAS-100 Iso MH except RABS) may be decontaminated in-line together with the disinfection cycle of the isolator. The instrument has a special decontamination gas flow path which prevents the sensitive parts from damage by the decontamination gas. It is recommended to connect the air sampler base unit with the isolator control systems which triggers the use of the decontamination flow path and ensures that the decontamination of the isolator and the air sampler run simultaneously.The relevant information is explained in detail in the manuals that accompany the products.
How can I calibrate the isolator air samplers MAS-100 Iso NT and MAS-100 Iso MH? Answer
We recommend to calibrate the MAS-100 Iso instruments with the DA-100 NT digital anemometer. An automatic calibration including generation of a calibration certificate can be performed by connecting the DA-100 NT with the MAS-100 Iso NT or MAS-100 Iso MH using an RS-232 cable.Note: Calibration is made easier if an RS-232 cable is built into an isolator that will connect the DA-100 NT with the MAS-100 Iso base unit for calibration/adjustment.
I can not see the hole pattern imprinted on the agar plate after running the instrument. How can that be? Answer
The hole pattern is caused by water that has evaporated from the agar. The newer the petri dish, the stronger appears the imprint. Older petri dishes can show up to no imprints.Make sure that your media is still able to support germs to form CFU's. For further questions please contact a quality media manufacturer such as Merck.
What is the difference between the two sampling heads 400x0.7 and 300x0.6? Answer
Both sampling heads collect with 100 L/min. They both have the same physical outer dimensions and mechanically fit on all current MAS-100 air samplers.There are two application-relevant differences:1) Different Feller tables have to be applied (see download section) as the probability of two CFU hitting the same hole are different.2) Due to the smaller hole diameter of the 300x0.6 (0.6mm) the air flow speed is much higher (about 20 m/s vs 11 m/s for the 400x0.7).This higher air speed translates into a better collection efficiency (D50=1.1?m vs 1.6?m).For these reasons the 300x0.6 has become the standard sampling head. However, some customers have collected vast amounts of data using the 400x0.7 head and for historical comparability want to further use this lid. Also: The MAS-100 Eco is only compatible with the 400x0.7.
How can I clean and sterilize the perforated lid? Answer
The perforated lid and dust cover can be cleaned by ultrasound and wiping with a clean cloth moistened with 60-80% alcohol/deionized water. For sterilization lid and cover are autoclavable (@20 min/121?C) or can be dry-decontaminated at 180?C during 60 minutes.For the outside of the instrument dirt may be removed by wiping with a clean cloth moistened with a mixture of 60-80% alcohol/deionized water.For a reference see Sandle, T. and Satyada, R. (2015): Assessment of the disinfection of impaction air sampler heads using 70% IPA, as part of cleanroom environmental monitoring, European Journal of Parenteral and Pharmaceutical Science, 20 (3): 94-99.
How can I clean my MBV microbial air sampler? Answer
Dirt may be removed from the exterior of the instrument by wiping with a clean cloth moistened with a mixture of 60-80% alcohol/deionized water.For a reference see Sandle, T. and Satyada, R. (2015): Assessment of the disinfection of impaction air sampler heads using 70% IPA, as part of cleanroom environmental monitoring, European Journal of Parenteral and Pharmaceutical Science, 20 (3): 94-99.The perforated lid and dust cover can be cleaned by ultrasound and wiping with a clean cloth moistened with 60-80% alcohol/deionized water.
Why can I set the sampling volume to 0 (zero)?Can I re-activate volumes which were set to 0? Answer
By setting one or more volumes to 0 liters, you can blank it from the screen. This allows you to display just the sampling volumes of interest to your company and avoids selecting a wrong volume by mistake.A volume that has been set to zero can be overwritten in the menu and be set to any volume within the standard volume range.
Is it possible to upgrade MAS-100 for data communication? Answer
MAS-100 may be upgraded for data communication starting with Serial No. 66161. Please contact us on service_at_mbv.ch for more information.
Does my instrument comply with DIN EN ISO 14698? Answer
All MAS-100 instrument types comply with ISO 14698: Cleanrooms and associated controlled environments ? Biocontamination control.All MAS-100 instruments are impaction air samplers based on the Anderson principle.
How frequently do I have to re-calibrate my air sampler? Answer
We recommend to re-calibrate any MAS-100 type air sampler at least annually.MBV offers on-site or in-house recalibration services. Contact service_at_mbv.ch
Are perforated sampling lids interchangeable between different instruments? Answer
Yes, perforated lids are manufactured to very tight specifications. They can be interchanged between different units.Take care that the sealing surface is scratch free and seals tightly against the instrument. If in doubt contact our service team on service_at_mbv.ch.You can not exchange 300x0.6 with 400x0.7 sampling heads without changing the head type in the software and re-calibrating the instrument.
Which MBV air samplers compensate for variations in ambient temperature and air pressure? Answer
All instruments with mass flow sensors have also a pressure and temperature sensor and will compensate in variations of ambient temperature and air pressure.These are namely: MAS-100 NT, MAS-100 NT Ex, MAS-100 CG Ex, MAS-100 Iso NT, MAS-100 Iso MH and DA-100 NT
Does the DA-100 NT digital anemometer compensate for ambient air pressure and temperature variation? Answer
Yes, the DA-100 NT has both a temperature and pressure sensor and compensates for variations in these parameters. The data can also be read on the display or recorded by the PC software.It provides air flow both as volume or mass-flow.
My instrument displays a message 'Calibration expired'. Can I still continue working? Answer
Yes, unless if the 'Block measurement if calibration validity expired' option has been activated (only available in some instruments).For the MAS-100 (not MAS-100 NT) it is only possible to continue for Firmware V2.6 and above.
Do MAS-100 type instruments create turbulence in a laminar flow cabinet, cleanroom or isolator/RABS? Answer
The isokinetic air flow in these controlled environments is usually 0.45m/s. Under this condition our instruments aspirate essentially the volume of air that is being supplied by the laminar air flow. The exhaust of the impacted air of our instruments is in in the same direction as the air inflow.If your controlled environment has a horizontal air flow all our instruments can also be oriented horizontally.This means that our instruments generate minimal turbulence.
What is the difference between the MAS-100 NT and the MAS-100 NT Ex? Answer
The MAS-100 NT Ex is a microbial air sampler for use in potentially explosive atmospheres according to Directive 2014/34/EU. It has been certified by Electrosuisse SEV (Certificate number SEV 08 ATEX 0143 X) and is in compliance with the essential health and safety requirements EN60079-0:12 + A11:13 and EN 60079-7:15.It bears the marking Ex II 3G Ex ec IIC T4 GcAll operating functions the collection performance and calibration procedure are identical to the MAS-100 NT. This allows users to compare data from normal and potentially explosive environments by using essentially the same instrument.
Why are the rings and the membrane keypad of the MAS-100 NT Ex black? Answer
The MAS-100 NT Ex rings and the keypad are black to clearly differentiate it from the standard non explosion proofed MAS-100 NT with silver keypad and blue rings.
In which environments can the MAS-100 NT Ex be used? Answer
The MAS-100 NT Ex complies with the essential health and safety requirements relating to the design and construction of equipment and protective systems intended for use in potentially explosive atmospheres given in Annex II to Directive 2014/34/EU of the European parliament and of the Council, dated 26 February 2014.It bears the marking Ex II 3G Ex ec IIC T4 Gc.A conformity statement issued by Electrosuisse bearing the certificate number SEV 08 ATEX 0143 X is available upon request from welcome_at_mbv.ch.
What are the main differences between the MAS-100 Eco and the MAS-100 NT? Answer
The MAS-100 Eco is a robust air sampler developed for application in the food and beverage, cosmetics and building industries where regulatory requirements are less stringent than in the pharmaceutical industry.Both instruments guarantee excellent recovery rates.The MAS-100 NT offers additionally:- Integrated gas mass flow sensor with temperature and pressure compensation- D50 of 1.1 ?m instead of 1.6 ?m - Fully automated air flow calibration and adjustment possible with the DA-100 NT- Data communication with PC- Available as explosion proofed version
Which instruments can be fixed on a tripod? Answer
All mobile instruments with the exception of the MAS-100 CG Ex can be attached to a tripod.- MAS 100 NT, MAS-100 NT Ex and MAS-100 VF: Standard photographic thread in bottom plate of instrument. Additionally available: Quick change adapter for easy tripod connection.- MAS 100 Eco: Tripod adapter sold as optional part
How can I open the bottom plate of the MAS-100 Eco to replace the battery? Answer
The procedure is explained in the user manual:The base plate can be removed with the aid of the perforated lid. Lift off the perforated lid and place it over the base plate. Ensure that the perforated lid properly fits to the three slots in the base plate. Rotate counter clockwise and remove the base plate. Important: Only use the perforated lid to remove the base plate!
What is a calibration reminder? Answer
The calibration reminder is a user-selectable software function which can be set to 0 - 12 months after calibration. After the set time has elapsed the display will show a message to remind that recalibration is required. If the calibration reminder time is set to zero the reminder function is deactivated. Setting up a calibration reminder and the exact function is explained in the respective user manual.
How can I disable/deactivate the calibration reminder? Answer
Setting up a calibration reminder and the exact function is explained in the respective user manual.Setting the reminder time to 0 (zero) will deactivate the calibration reminder.
Why does MBV offer a special instrument to monitor microbial contamination in compressed gases and not just an option with a pressure reduction valve to a standard microbial air sampler? Answer
MBV aims to supply sampling equipment that reflects the actual usage situation as close as possible and that satisfies our customers' requirement for best possible process security. The MAS-100 CG Ex is directly connected to the compressed gas pipe and works within an absolute pressure range of 1.5 - 10 bar. The gas sample is impacted onto the agar plate under pressure without a pressure reduction valve before the sampling head. This reflects the sampling characteristics of a standard microbial air sampler. A pressure reduction before the sampling plate may lead to damage of germs similar to a French press which is used to disrupt cell membranes. In the MAS-100 CG Ex the pressure reduction occurs after gas sampling and after volume flow determination.
Which compressed gases might be used with the MAS-100 CG Ex? Answer
The following compressed gases, which are most frequently used in industries, are pre-programmed: Compressed air, nitrogen, carbon dioxide, argon, oxygen.Up to 10 gas types may be programmed by the user and stored in the instrument.
What type of metal is the MAS-100 CG Ex sampling head made of? Answer
The sampling head of the MAS-100 CG Ex is made of anodized aluminium. It is tested up to a pressure of 20 bar and has an operating range of 1.5 - 10 bar.Cover and bottom parts are marked with identical serial numbers which correspond to the pressure test certificate.
Why is the MAS-100 CG Ex explosion proofed? Answer
The gas distribution systems in companies might be in explosion risk areas. Additionally, some gasses (e.g. oxygen) pose additional risk if compressed. For security reasons the MAS-100 CG Ex complies with the requirements for explosion proofed areas.
Is it possible to autoclave or otherwise sterilize the sampling head and the tubing of the MAS-100 CG Ex? Answer
Both the sampling head and the attached sampling tubing of the MAS-100 CG Ex can be autoclaved for 20min at 121?C or dry decontaminated at 180?C for 60min. Both parts can also be sterilized using VHP. When the MAS-100 CG Ex is being moved to a critical area, we suggest wiping it with a clean cloth moistened with 60-80% alcohol/deionized water. Make sure that the holes in the perforated lid are not clogged.
What is the working principle of the MAS-100 CG? Ex? Answer
The instrument is a high-performance instrument that is based on the principle of the Andersen air sampler. It uses standard Petri dishes and collects the microorganisms fully automatically. The instrument operates with two sensors, one measuring the mass flow and the other measuring the pressure. These two sensors calculate a constant flow of 100 L/min or 50 L/min over a range of 1.5 to 10 bar.The gas is directed through a perforated disk (300?0.6mm) onto a standard agar plate. The high speed of gas flow (ca. 20 m/s at 100 L/min and ca. 10 m/s at 50 L/min) will hit the surface of the agar plate. The instrument has an excellent collection rate and a low D50 value of 1.1 _m, when using a 300?0.6 perforated lid. This is identical to the MAS-100 NT microbial air sampler under ambient pressure conditions and makes the sampling data comparable. After the collection cycle, the system is purged and the Petri dish removed, incubated and the colonies are counted. The colonies counted on the surface of the Petri dish will be corrected according to the ?Feller Table" (downloadable from this website) and expressed as CFU/m3 (colony forming units/cubic meter) ga
What type of Petri dishes can be used with MBV microbial air samplers? Answer
MBV microbial air samplers are open systems. They can be operated with all standard 90-100 mm Petri dishes. We also offer adapters for special formats (e.g.contact plates).Ability of microorganisms to grow and form colony forming units (CFU's) is increased by using plates from quality suppliers (e.g. Merck).
How can I recalibrate the DA-100 NT Anemometer? Answer
The DA-100 NT is delivered with a calibration certificate from an accredited Swiss federal laboratory. To recalibrate the DA-100 NT you may send it directly to the following address: MBV AGService DepartmentCH-8712 St?faSwitzerland.Note: Please include the filled Repair/Calibration form and the Safety Certificate which you can download from the download section.
How frequently do I have to re-calibrate the DA-100 NT digital anemometer? Answer
MBV recommends annual re-calibration of the DA-100 NT.
The illumination and contrast of the DA-100 Anemometer display ist very low and it is difficult to read. Will I get incorrect results? Answer
No. The battery is weak and needs to be changed. The process of changing the battery is described in the DA-100 NT user manual.The type of replacement battery and the process of changing the battery is described in the DA-100 NT user manual.
How can I change the battery in the DA-100 NT digital anemometer? Answer
The type of replacement battery and the process of changing the battery is described in the DA-100 NT user manual.
Can I use a filter for the MAS-100 Iso MH? Is there a recommended filter type? Answer
Yes it is possible to use a filter with an MAS-100 Iso MH.Some points have to be considered. The filter generates a significant constriction in the air path. Therefore the tube length and the tube diameter are important factors. In general any filter can be used which produces not too much pressure drop.We recommend using the Millipore Aerovent XL 4 filter in combination with a tube diameter of 25mm and a maximum tube length of 10m. MBV offers to perform tests before purchase for other filters and tube lengths if the required filters is provided and using a standardised tubing of specified length.
Can I use a filter for the MAS-100 Iso NT? Is there a recommended filter type? Answer
We do not recommend using a filter with the MAS-100 Iso NT and we can not recommend a suitable filter. A filter forms a significant constriction in the air path which has to be overcome by the blower motor. The blower motor of the MAS-100 Iso NT does not have sufficient excess capacity to permit for the air flow constriction imposed by a filter.If a filter has to be used we recommend using an MAS-100 Iso MH which has a significantly stronger blower motor. Please check similar question for MAS-100 Iso MH for more information
I work with toxic substances and need a filter for my application. Should I place the filter before or after the instrument? Answer
We recommend placing the filter before the MAS-100 Iso MH instrument (inlet path) as close to the sampling head as possible. With this the instrument and most of the piping/tubing is protected from harmful substances.
Is it possible to select only one specific sampling head of the 4 possible heads of the MAS-100 Iso MH for decontamination? Answer
The sampling heads can not be individually selected by the user for the decontamination cycle. The MAS-100 Iso MH starts at sample head 1 and sequentially moves to the next channel to ensure that all valves are thoroughly decontaminated. The MAS-100 Iso MH calculates the time needed for tube flushing for each sampling head from the configured tube length and diameter and switches automatically to the next sampling head.
Is it necessary that the MAS-100 Iso NT/MH base unit is accessible? Answer
For routine use a network-integrated MAS-100 Iso NT or MH base unit does not need to be physically accessible. All functions can be performed by remote commands.For service and calibration interventions the instrument has to be accessible.Frequently customers install the MAS-100 Iso MH base unit in a technical area close to an isolator.
What communication interfaces do MAS-100 Iso NT/MH instruments offer? Answer
All MAS-100 Iso NT/MH instruments can be integrated into SCADA and similar control systems by a variety of communication interfaces.Digital I/O, USB, RS-232 (RS-485 with converter) interfaces are included as standard.Ethernet or Profibus can be ordered or installed as option.An extensive communication manual is delivered with each unit and can be supplied upon request by MBV.
Is it possible to control the MAS-100 Iso NT/MH simultaneously with Profibus and Ethernet? Answer
All MAS-100 Iso NT or MAS-100 Iso MH can either be controlled with Profibus or with Ethernet but not both.
Is the MAS-100 Iso NT/MH equipped as standard with Profibus or Ethernet? Answer
An optional hardware module is required to use either an Ethernet or Profibus interface.If one of these interfaces is ordered with the instrument it will be factory-fitted and tested.Both modules can be retrofitted on site by a certified service engineer.
What recommended service intervals for MAS-100 Iso NT/MH instruments? Answer
MBV recommends annual service and calibration of MAS-100 Iso NT/MH instruments. We offer in-house and on-site service and calibration services. For more information please check www.mbv.ch/service or contact us directly on service_at_mbv.ch
Where do I have to connect the DA-100 NT digital anemometer to calibrate the MAS-100 Iso NT and MAS-100 Iso MH? Answer
The DA-100 NT has to be connected on the RS-232 (X6) printing port to calibrate MAS-100 Iso NT/MH instruments.If a printer is connected to the instrument please unplug it during calibration.
Why does the MAS-100 Iso NT/MH instrument have to be adjusted/calibrated after the installation in the isolator? It has already been calibrated in the factory and comes with a factory calibration certificate. Answer
Each isolator installation is different (tubing/piping resistance, filter in the tubing/piping, isolator/cleanroom pressure differentials). A local calibration/adjustment and setting of the calibration parameters takes account of these specifics and guarantees precise measurements.
Is it possible to operate different sampling heads of one MAS-100 Iso MH in multiple different controlled environments? Answer
This is possible under specific circumstances. Please contact us on sales_at_mbv.ch or +41 44 928 30 80
Which tests have to be performed after the installation of the MAS-100 Iso NT/MH into an isolator/RABS? Answer
All installation proceedures including required tests and needed testing tools are described in the respective manuals.MBV offers IQ/OQ documentation and on-site IQ/OQ services.The following tests are the recommended standard procedure after installation of an MAS-100 Iso NT/MH instrument:1. Pressure test to check the tightness of all tubes and fittings.2. Adjustment and calibration for setting up the correct adjustment parameters for your application3. Adjustment of the decontamination flow.
What is the recommended maximum length for the input tube of the MAS-100 Iso MH? Answer
The specified tube length for the MAS-100 Iso MH is 10 m. The effectively usable tube length can be considerably longer and depends on the tube/pipe diameter, the amount of constrictions in the system and whether a filter will be used or not.Please contact sales_at_mbv.ch (or +41 44 928 30 80) for further advice.
Can the holes of the sampling lid get clogged in use? Answer
We have no evidence that holes have ever been clogged.The speed of air/gas through the holes is too high for particulates to settle inside the hole. However, regular cleaning of the perforated lid as described in the manual will keep the lid surface clean. It will also prevent contamination of the sample.For a reference see Sandle, T. and Satyada, R. (2015) Assessment of the disinfection of impaction air sampler heads using 70% IPA, as part of cleanroom environmental monitoring, European Journal of Parenteral and Pharmaceutical Science, 20 (3): 94-99.
We use the Silicone gasket mesh 20 (Art.No. 04.4916.01) that you propose to be used with the EasyClean head to prevent large particles from aspiration into the valves of the MAS-100 Iso NT/MH. Can this material act as a catalyst during H2O2 fumigation and thereby deactivate the hydrogen peroxide? Answer
This will not occur. The steel used in the mesh is of the same quality as for the other parts of the MAS-100 Iso NT/MH.
I have two MAS-100 instruments but one instrument gives significantly lower CFU counts than the other. Answer
Please check the following:- Do both instruments have the same perforated lid type? MBV offers two basic types: 400x0.7 (grey sieve in perforated lid) and 300x0.6 (blue sieve in perforated lid). It is normal that the collection efficiency of the 400x0.7 lid is lower because the impaction speed is lower and consequently the D50 value. You can find more on this topic in the manual.- Have you tried to switch the perforated lids between units? May be a lid sealing surface has been scratched or bent and does not seal tightly against the instrument and draws air through the gap. To test this you can seal around the interface between the lid and the instrument using a sticky tape or Parafilm (screw the lid on the instrument and tape the gap).- When sampling: Did you switch positions within the room between the units and between different samples? Frequently the distribution of airborne microorganisms within a room is very heterogenous- Have you thoroughly cleaned and disinfected all lids an are you sure there is no clogging of the holes?
Is the polymer dust cover of the MAS-100 Eco and MAS-100 VF sterilizable? Answer
The dust cover can be cleaned in an ultrasonic bath and by wiping with a clean cloth moistened with 60-80% alcohol/deionized water. For sterilization the lid is autoclavable (@20 min/121°C) or can be fumigated using vaporized hydrogen peroxide.
What is the K3 and the K5 value for? Answer
The K3 value is a single reference point to adjust the Mass Flow sensor in the MAS-100 / MAS-100 ISO. Calibration of the MAS-100 (exclusively with a 400 x 0,7mm sampling head) flow rate involves adjustment of a single reference point, the K3 value. Following the calibration, a load adjustment is made to the fan motor, this is the K5 setting. The MAS-100 with firmware V2.6x and above allow for both the K3 and K5 value adjustments. The K5 adjustment optimizes the voltage delivered to the motor, so that the MAS-100/ MAS-100 ISO maintains consistent flow rates with a flow restriction. A flow restriction is created to produce a load on the motor that far exceeds normal operating conditions.
Does the K5 value affect the K3 value? Answer
The air flow adjustments made to the K5 setting do not affect the K3 calibration or the performance of the MAS- 100/MAS-100 Iso under normal operating conditions (Sampling Mode). The flow rate measurement made during the K5 adjustment is not a direct indication of the performance of the mass flow sensor in the MAS-100/MAS-100 Iso. Therefore an MAS-100 should not be classified as out of tolerance if the SLPM measured in the K5 portion of the calibration protocol exceeds the optimum range previously specified.
Do I need to calibrate the K5 value? Answer
Following the calibration of the MAS-100 /MAS-100 Iso, a load adjustment is made to the fan motor, this is the K5 setting. This setting was necessary to compare the old readings on the MAS-100 C with the new resistance free anemometer. It is not needed anymore for the adjustment / calibration with a DA-100 NT. Therefore it can be set to 0 at systems with a sampling head of 400 x 0.7 and it must be set to 0 at systems using a sampling head of 300 x 0.6, otherwise the fan would be loaded to high. MBV recommends to set the K5 value at all systems to 0.
Where are the K3 and K5 values in the MAS-100 (Iso) NT (MH) systems? Answer
There are no K3 and K5 settings in the NT systems. The most similar value is the PWM value. This sets the rotation speed of the fan motor.
Can I sterilize my MAS-100 instrument using vaporized hydrogen peroxide (H2O2)? Answer
The answer depends on the instrument you are using:- MAS-100 NT/MAS-100 NT Ex: These instruments can be VHP decontaminated under the following conditions:* Only use dry vaporized H2O2 (no conclusion possible for other decontamination media)*Instrument must be switched off, blower inactive during decontamination* Unmount the perforated lid for best results (the lid can also be autoclaved for 20 min @121°C)*A decolorization of the blue/black parts may become visible- MAS-100 Iso NT/MH: The sampling head and tubing/piping can be decontaminated using vaporized hydrogen peroxide according to the manual- No other instruments have been tested and therefore no statement can be made regarding their suitability for vaporized hydrogen peroxide decontamination