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Box particle filter
Technical FAQ Gloveboxes
Technical FAQ Gloveboxes
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1. Do I have to flush my system for commissioning?
You should flush the system to a ppm value of <100ppm O2 with working gas (N2 or Ar or He) before starting the circulation. You will need approximately 11 times the box volume of purge gas to achieve 100ppm O2 (depending on the installation and purge method, the required gas volume may vary). This corresponds to approx. 1 bottle (50 litres) per m3 box volume.
2. How much regeneration gas do I need?
You need approx. 1/3 bottle (50 litres) of regeneration gas with a concentration of 5-10% H2 in Ar or N2 to carry out the regeneration. The regeneration consumes approx. 3500l from the 50 litre bottle (at approx. 70-80 bar). If you have selected the regeneration gas concentration <5%, the required regeneration gas quantity will increase to approx. 7000l.
3. When should I regenerate my box?
Regeneration should be performed when the value of O2 or H2O exceeds the required value (ppm value where the product/process will not be damaged) in the box. It should be done about every 3-6 months.
4. What oxygen levels are necessary before I carry out a regeneration?
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.
5. Can I stop the regeneration?
When the regeneration is started, a pop-up window appears with the question "Are you sure you want to regenerate? The regeneration can be aborted with "NO". If you have selected "YES", you will subsequently be prompted to check the regenerating gas flow.
From this point on, you can no longer completely interrupt the regeneration and circulate it again via the Reactor Copper Molecularsieve (RKM).
Depending on the software version, the complete regeneration runs through or the next step to abort the regeneration is started. You can read the remaining regeneration time on the "Status" page in the regeneration gas menu.
Even if the replenishment gas cylinder does not contain the required quantity of replenishment gas or is empty, you must allow the replenishment process to run through.
The system will not be damaged if a regeneration without gas has been started accidentally. The regeneration cycle must be completed, otherwise the corresponding Reactor Copper Molecularsieve (RKM) will be locked.
6. Why do I see high levels of oxygen and humidity when the blower is switched off?
The analyzer 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.
7. How often should I change my filter/material for solvent removal?
1 kg activated carbon (Art.-No. 1516020) can hold approx. 100 ml solvent.
The internal solvent filter (Art.9004451) has a capacity of 1 kg activated carbon. Depending on the solvent used, it should be replaced every month.
The external solvent filter (Art.1500326) has a capacity of 5 kg activated carbon. Depending on the solvent used, it should be replaced after 3-6 months.
The external solvent filter (Art.1500322) has a capacity of 8 kg activated carbon. Depending on the solvent used, it should be replaced after 3-6 months.
8. Why do I see water in the flow meter?
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.
9. Error: 'Gas cleaning: Reactor 1/2 Main Valve Inlet/Outlet Not Open' on the screen?
This error means that the electro-pneumatic valves on the top of the filter column (RKM input/output) are not fully open or closed. Usually this is caused by an empty gas cylinder or too low pressure of the working gas supply. Please set the pressure to 6 bar. If this does not help, it will be necessary to change the gas cylinder.
10. Which gases do I need to operate the gas cleaning system?
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 5-10% H2 in 90-95% 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 0.5 bar, a corresponding pressure reducer with a corresponding setting range for reducing the gas cylinder pressure is required.
11. What happens to the system in the event of an unexpected power failure?
A power failure will not damage the system. In the event of a power failure, all system valves close.
Once the power failure has been rectified, the system reboots to the level of the system at which the power failure has occurred. Depending on the software version, the system can continue in the step it was in during a power failure when regeneration is started. Otherwise it starts the regeneration gas process from the beginning.
12. Do the oxygen and water sensors need to be serviced?
The oxygen sensor is maintenance-free but should be calibrated regularly at production plants.
The water sensor should be cleaned according to the system message (every 2000 hours) and replaced with 85% phosphoric acid. Then reset the hour counter to 'zero' (see description in the user manual). The water sensor should also be calibrated regularly in production systems.
A standard calibration takes approx. 2 weeks. Should you not be able to bridge this period without a sensor, we will be happy to offer you replacement and/or rental devices.
13. Does the system require cooling water?
It is not necessary to connect cooling water. If possible (heat exchanger installed in the gas cleaning system) it reduces the temperature in the glove box and results in a more pleasant working temperature.
14. Does the system have to be connected to an exhaust air?
The system does not have to be connected to an exhaust air. However, if hazardous substances are used, a connection is recommended. The connections should be at the vacuum pump, the purge outlet valve, the regenerating gas outlet, the pressure relief valves and, if purge sluices are used, at their outlet valves. The specification of the exhaust air system is given in the user manual.
15. Error 'Circulation fan GB1 Motor protection tripped or frequency inverter fault'?
Check the frequency converter in the electrical cabinet of the gas cleaning unit. The error code is listed in the user manual. A 'reset' on the frequency inverter resets the error message. Another possible cause may be that the fuse or the motor protection switch has tripped it. In this case, please switch on again. If the fault occurs repeatedly, it may be due to dirty box dust filters or a damaged circulation fan.