发明名称 |
PROCESS CONTROL SYSTEM USING A TWO WIRE REMOTE CONTROL SYSTEM |
摘要 |
<p>A process control system including a control station responds to the departure of a process variable from a set point to provide a direct current signal in a two-wire transmission line in a direction dependent upon the direction of such departure and time-proportioned in accordance with the magnitude of the departure. A solid state power relay that accepts the d-c signal at a single pair of input terminals includes high-current rating triacs that are adapted selectively to be fired by triggering pulses generated in response to the d-c signals alternating current power from a source of alternating current to a heavy-duty motorized valve for operation of the latter in one direction or the other and at a speed in accordance with the signals.</p> |
申请公布号 |
CA1031845(A) |
申请公布日期 |
1978.05.23 |
申请号 |
CA19740216496 |
申请日期 |
1974.12.19 |
申请人 |
HONEYWELL INC. |
发明人 |
GUICHETEAU, EUGENE H.;JOHNSON, JUSTIN O. (JR.) |
分类号 |
G05B11/26;G05B11/28;G05D7/06;(IPC1-7):05D13/02 |
主分类号 |
G05B11/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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