Digital span adjuster for differential pressure measuring device
First Claim
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1. IN A PRESSURE MEASURING DEVICE INCLUDING A FORCE BALANCE TRANSMITTER INCLUDING A FORCE MOTOR, CURRENT MEANS TO ENERGIZE THE FORCE MOTOR, THE FORCE MOTRO MAINTAINING THE TRANSMITTER IN A BALANCED CONDITION AND THE CURRENT REQUIRED FOR ENERGIZATION OF THE FORCE MOTOR INDICATING THE PRESSURE AND MEANS FOR MEASURING THE CURRENT, THE IMPROVEMENT OF A SPAN ADJUSTMENT MEANS INCLUDING:
- (A) A PLURALITY OF SHUNT GROUPS, EACH OF SAD SHUNT GROUPS REPRESENTING A DECIMAL DECADE, EACH OF SAID SHUNT GROUPS BEING CONSTITUTED BY A PLURALITY OF SHUNT IMPEDANCE MEANS HAVING ADMITTANCES IN A BINARY RELATIONSHIP, AND (B) A PLURALITY OF SWITCHING MEANS, EACH OF SAID SWITCHING MEANS SELECTIVELY CONNECTING ONE OF SAID IMPEDANCE MEANS IN PARALLEL WITH THE FORCE MOTOR TO THEREBY ADJUST THE CURRENT SPAN WHICH ENERGIZES THE CURRENT MEASURING MEANS FOR A GIVEN SPAN OF APPLIED PRESSURES.
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1 Claim
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1. IN A PRESSURE MEASURING DEVICE INCLUDING A FORCE BALANCE TRANSMITTER INCLUDING A FORCE MOTOR, CURRENT MEANS TO ENERGIZE THE FORCE MOTOR, THE FORCE MOTRO MAINTAINING THE TRANSMITTER IN A BALANCED CONDITION AND THE CURRENT REQUIRED FOR ENERGIZATION OF THE FORCE MOTOR INDICATING THE PRESSURE AND MEANS FOR MEASURING THE CURRENT, THE IMPROVEMENT OF A SPAN ADJUSTMENT MEANS INCLUDING:
- (A) A PLURALITY OF SHUNT GROUPS, EACH OF SAD SHUNT GROUPS REPRESENTING A DECIMAL DECADE, EACH OF SAID SHUNT GROUPS BEING CONSTITUTED BY A PLURALITY OF SHUNT IMPEDANCE MEANS HAVING ADMITTANCES IN A BINARY RELATIONSHIP, AND (B) A PLURALITY OF SWITCHING MEANS, EACH OF SAID SWITCHING MEANS SELECTIVELY CONNECTING ONE OF SAID IMPEDANCE MEANS IN PARALLEL WITH THE FORCE MOTOR TO THEREBY ADJUST THE CURRENT SPAN WHICH ENERGIZES THE CURRENT MEASURING MEANS FOR A GIVEN SPAN OF APPLIED PRESSURES.
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Current AssigneeBristol, David A.
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Original AssigneeBristol, David A.
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InventorsBristol, David A.
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Application NumberUS04/557,214Time in Patent Office512 DaysField of SearchUS Class Current73/701CPC Class CodesG01L 13/02 using elastically-deformabl...
