The flowmeter on the right is only used to test for leaks in the MFS/1 gas flow. The gas
exiting the chamber passes through the valve positioned at the back of the product
labelled “OFF/ TEST”. The normal operating position for this valve is “OFF”. With the
valve in this position the outlet gas passes directly from the chamber to the gas outlet
connection. With the valve in the position “TEST” the gas exiting the chamber passes
through the right hand flowmeter before passing to the gas outlet. With the valve in the
“TEST” position the flow rates of both flowmeters should be equal. If the flowmeter on
the right shows a lower flow rate this indicates there is a gas leak; check the door is
sealed correctly as this is the most likely cause for a leak.
Do not leave the valve in the “TEST” position longer than is necessary to carry out the
leakage check; otherwise water vapour will build up inside the right hand flowmeter.
2.5
Desiccator (if supplied)
The optional desiccator is designed for separate use and is not connected to the oven in
any way. It is used for cooling the sample. Gas inlet and outlet are provided so that
nitrogen can be passed over the cooling sample.
The maximum gas supply pressure must be regulated to 1 bar.
9
