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Adsorption Troughs

The 8 to 12 adsorption troughs are controlled with a Process Logic Controller M251 from Schneider. This PLC reads the analog signals returned by the surface tensiometers. The temperature of the liquid interfaces are controlled with a thermostatic bath and monitored with compact pyrometers. A gas can be circulated above the interface via a flow-rate controller. In addition, the PLC controls the heating of the neutron and laser windows to prevent condensation. All these devices are controlled from the touch panel of the PLC which is also used to control the Langmuir Trough.

AddressAccessTypeDescription
40001ReadRealA1 — Surface tension signal x (V)
40003ReadRealA1 — Coefficient a
40005ReadRealA1 — Offset due to paper probe b
40007ReadRealA1 — Constant c for zeroing the sensor (relative measurement)
40009ReadRealA1 — Surface tension a x + b - c (mN/m)
40011ReadRealA3 — Surface tension signal x (V)
40013ReadRealA3 — Coefficient a
40015ReadRealA3 — Offset due to paper probe b
40017ReadRealA3 — Constant c for zeroing the sensor (relative measurement)
40019ReadRealA3 — Surface tension a x + b - c (mN/m)
40021ReadRealB1 — Surface tension signal x (V)
40023ReadRealB1 — Coefficient a
40025ReadRealB1 — Offset due to paper probe b
40027ReadRealB1 — Constant c for zeroing the sensor (relative measurement)
40029ReadRealB1 — Surface tension a x + b - c (mN/m)
40031ReadRealB3 — Surface tension signal x (V)
40033ReadRealB3 — Coefficient a
40035ReadRealB3 — Offset due to paper probe b
40037ReadRealB3 — Constant c for zeroing the sensor (relative measurement)
40039ReadRealB3 — Surface tension a x + b - c (mN/m)
40041ReadRealC1 — Surface tension signal x (V)
40043ReadRealC1 — Coefficient a
40045ReadRealC1 — Offset due to paper probe b
40047ReadRealC1 — Constant c for zeroing the sensor (relative measurement)
40049ReadRealC1 — Surface tension a x + b - c (mN/m)
40051ReadRealC3 — Surface tension signal x (V)
40053ReadRealC3 — Coefficient a
40055ReadRealC3 — Offset due to paper probe​​​​​​​ b
40057ReadRealC3 — Constant c for zeroing the sensor (relative measurement)​​​​​​​
40059ReadRealC3 — Surface tension a x + b - c (mN/m)
40061ReadRealD1 — Surface tension signal x (V)
40063ReadRealD1 — Coefficient a
40065ReadRealD1 — Offset due to paper probe​​​​​​​ b
40067ReadRealD1 — Constant c for zeroing the sensor (relative measurement)​​​​​​​
40069ReadRealD1 — Surface tension a x + b - c (mN/m)
40071ReadRealD3 — Surface tension signal x (V)
40073ReadRealD3 — Coefficient a
40075ReadRealD3 — Offset due to paper probe​​​​​​​ b
40077ReadRealD3 — Constant c for zeroing the sensor (relative measurement)​​​​​​​​​​​​​​
40079ReadRealD3 — Surface tension a x + b - c (mN/m)
40081ReadRealTemperature setpoint (°C)
40083ReadRealA+B — Temperature (°C)
40085ReadRealC+D — Temperature (°C)
40087ReadRealA+B — Gas flow rate (l/min)
40089ReadRealA+B — Gas flow rate setpoint (l/min)
40091ReadRealC+D — Gas flow rate (l/min)
40093ReadRealC+D — Gas flow rate setpoint (l/min)
40095ReadRealA1 — Trough surface (mm2), equal to 0 if unused
40097ReadRealA2 — Trough surface (mm2), equal to 0 if unused
40099ReadRealA3 — Trough surface (mm2), equal to 0 if unused
40101ReadRealB1 — Trough surface (mm2), equal to 0 if unused
40103ReadRealB2 — Trough surface (mm2), equal to 0 if unused
40105ReadRealB3 — Trough surface (mm2), equal to 0 if unused
40107ReadRealC1 — Trough surface (mm2), equal to 0 if unused
40109ReadRealC2 — Trough surface (mm2), equal to 0 if unused
40111ReadRealC3 — Trough surface (mm2), equal to 0 if unused
40113ReadRealD1 — Trough surface (mm2), equal to 0 if unused
40115ReadRealD2 — Trough surface (mm2), equal to 0 if unused
40117ReadRealD3 — Trough surface (mm2), equal to 0 if unused
40119Read/WriteRealNOMAD Control — Temperature setpoint (°C)
40121Read/WriteRealNOMAD Control — A+B Gas flow rate setpoint (l/min)
40123Read/WriteRealNOMAD Control — C+D Gas flow rate setpoint (l/min)
40125Read/WriteRealNOMAD Control — Temperature tolerance (°C)
40127Read/WriteRealNOMAD Control — Gas flow rate tolerance (l/min)
40129Read/WriteIntegerNOMAD Control — Year
40131Read/WriteIntegerNOMAD Control — Month
40133Read/WriteIntegerNOMAD Control — Date
40135Read/WriteIntegerNOMAD Control — Hour
40137Read/WriteIntegerNOMAD Control — Minute
40139Read/WriteIntegerNOMAD Control — Second
40201ReadBoolean (bit 0)A+B — Temperature alarm (yellow: out of tolerance)
40201ReadBoolean (bit 1)C+D — Temperature alarm (yellow: out of tolerance)
40201ReadBoolean (bit 2)Temperature default (red)
40201ReadBoolean (bit 3)A+B — Gas flow rate alarm (yellow: out of tolerance)
40201ReadBoolean (bit 4)C+D — Gas flow rate alarm (yellow: out of tolerance)
40201ReadBoolean (bit 5)A+B — Gas flow rate default (red: out of gas)
40201ReadBoolean (bit 6)C+D — Gas flow rate default (red: out of gas)
40201ReadBoolean (bit 7)Condensation default (red: lid unplugged)
40202ReadBoolean (bit 0)NOMAD Control — Thermostatic bath default (red: no communication)
40202ReadBoolean (bit 1)NOMAD Control — Idle
40202ReadBoolean (bit 2)NOMAD Control — Running
40202ReadBoolean (bit 3)NOMAD Control — Local (0) / Remote (1)
40202Read/WriteBoolean (bit 4)NOMAD Control — Default acknowledgment
40202Read/WriteBoolean (bit 5)NOMAD Control — For resetting the PLC clock