Maintenance & SAV

Connection of the facility exhaust is optional and not strictly needed for system operation. For the installation and startup of a system, facility exhaust is not normally required.

While connecting the system to an exhaust is not required for proper operation, it is strongly recommended on systems where potentially hazardous substances are used.

If you choose to connect your system to an exhaust the main things that normally need to be connected are the purge valve, vacuum pump, and regeneration exhaust outlet.

Frequency of calibration is dependent on the requirements of the user. The sensors have a specified drift of <10%/year at 10ppm. For some research applications it is acceptable to go for several years between calibrations of the analyzers. In production applications the sensors should almost always be calibrated annually.

This alarm automatically comes on every 2000 hours of sensor use to act as a reminder to service the H²O probe. The H²O sensor needs to be periodically cleaned and coated with phosphoric acid. This should typically be done about every 3-6 months. Refer to the instruction manual for directions on how to clean the probe. The alarm can be reset by navigating to the 'Common Parameters' screen, selecting 'Service H²O Probe', resetting the counter to zero and acknowledging the alarm. It is important to note that cleaning the probe is different than calibrating the sensor.

Not necessarily, A heat exchanger is integrated into the gas purification system to achieve optimum working temperatures inside the glovebox. In hot climate zones it is recommended to connect the cooling water to the gas purifier to maintain comfortable working environments inside the glovebox. In laboratories equipped with air conditioner units which already maintain constant temperatures it is not needed to hook up cooling water to the gas purification system.

 

This means that there is an error indicated on the frequency controller for the blower or that the breaker for the blower has tripped, this can be caused by excessive load or wear on the blower or by a power surge or fluctuation.

To rectify the issue, open the electrical cabinet and locate the frequency controller, it is typically labeled ‘U1’. Note the error displayed on the controller. Then turn circulation off. Verify the box filters are clean and change if needed. With circulation off reset the controller by pushing the appropriate key on the controller. Once the code is cleared turn circulation back on. 

If the issue persists contact M. Braun Service with the project number of your glovebox and the error code from the controller. 

If the LCD on the controller is off, contact M. Braun Service.

 

You need approx. 1/3 bottle (50 litres) of regeneration gas with a concentration of 2%-5% H2 in Ar or N2 to carry out the regeneration. The regeneration consumes approx. 3500l from the 50 litre bottle (approx. 70-80 bar). If you have selected the regeneration gas concentration <5%, the required regeneration gas quantity will increase to approx. 7000l.

Please make sure that the box has an O2 value of <100ppm before starting regeneration. If this is not the case, rinse the system to an O2 value of <100ppm. The box gas is used to fill the reactor copper molecular sieve (RKM) after evacuation for cooling and should have a low oxygen value.

The analyzers needs a constant gas flow to measure correctly. Without the circulation of the box atmosphere, there is no gas flow across the sensors, which is why they measure incorrect values.

This is a good sign. It shows that the regeneration is working properly. During regeneration, the Reactor Copper Molecularsieve (RKM) is heated and the stored H2O is rinsed out. This condenses and partially precipitates in the flow meter.

As working gas, you can use nitrogen, argon or helium. The pressure should be at 6bar, an appropriate pressure reducer with an appropriate setting range for reducing the gas cylinder pressure is required.
A concentration of 2%-5% H2 in 95-98% Ar/N2 (depending on the type of working gas) can be used as regeneration gas (mixed gas). The pressure of the regenerating gas should be at 0.3 to 0.4 bar, a corresponding pressure reducer with a corresponding setting range for reducing the gas cylinder pressure is required.

The oxygen analyzer is maintenance-free but should be calibrated for systems for the first time after 15 months and then every 12 months.
The moisture sensor should be cleaned according to the system message (every 2000 hours) and re-passivated with 85% phosphoric acid. Then reset the hour counter to 'zero' (see description in the user manual). The water analyzer should also be calibrated regularly in production systems.

The system must be connected to an exhaust air system depending on room air and ventilation. In the event of a glovebox operation with a 50l gas cylinder, up to 10,000l of gas can flow into the premises. With a tank supply, however, much more.
If dangerous substances are used, a connection is recommended. The connections should be at the vacuum pump, the purge outlet valve, the regeneration gas outlet, the overpressure protection valves and, if purge valves are used, at their outlet valves. The specification of the exhaust air system is given in the user manual.

MBRAUN does not offer a Wifi connection for the myMBraun app. The reason for this is that MBRAUN needs to know your (secret) Wifi password, which is normally not known. We recommend to buy an ordinary Wifi router, connect it to the Wifi network and connect it to the Ethernet port of the glovebox. If you have only one IP address and wants to connect several gloveboxes, we recommend using a network switch that can handle NAT (Network Address Translation). In any case, the administration should be done by your IT department.

If your Oxygen Analyzer does show too high ppm values or does not change the displayed value at all. What might be wrong?

Please check if you do have higher concentrations of volatile, Oxygen-containing, or corrosive substances in the glovebox?

Please make sure you do not have any leakage in the box. Did you check your gloves for holes?