SPB
160 / 234 H172203_1_001
Controlled gas flow
The VT gas flow on the SPB(-E) is controlled using the integrated mass flow meter a solenoid
control valve. Flow variations (within physical limits, some minimal quality of gas supply must
be guaranteed) of the gas supply are eliminated and as a result stable conditions for the
temperature regulation are provided.
The gas flow meter is factory-calibrated and the compensation values stored on the on-
board non-volatile flash memory.
Regulated Gas Flow
Channel
SPB SPB-E
VT yes yes
Probe flush gas no (fixed flow) yes
Shim Cooling gas no (fixed flow) yes
Table14.5: Controlled Gas Flows
NOTICE
The mass flow controller cannot compensate for poor gas supply or
insufficient input gas pressure.
The new gas flow regulation ensure stable gas flow as long as site planning specifications
for pressurized gas are met.
Multifunction of probe FLUSH gas output
For safety reasons most valves are closed in fault conditions or when the BSMS system is
not powered.
The probe FLUSH gas channel is equipped with a normally open bypass-valve that will
ensure a certain amount of gas output even when the BSMS chassis is powered-off.
This output can be used as simple room temperature backup VT gas source for
configurations where the probe flush gas is not used otherwise (e.g. CryoProbes).
In case of a power failure the room temperature gas prevents the sample inside the
CryoProbe from getting too cold.
To Next Page
Loading...
General