Patent GB-970666-A (GB)
Title: Pipe-line metering arrangement
IPC: H03K21/00
Filed: 1962-05-14
Abstract: 970,666. Electric selective signalling systems; counters. WESTINGHOUSE AIR BRAKE CO. May 14, 1962 [May 16,1961],.No. 18489/62. Headings G4D and G4H. In a pipeline metering and product delivery control system, the quantity flow of the product at each remote delivery station is recorded by means of a flow meter and a counter, and the quantity to  be delivered is controlled from a control office by transmitting signals representing the desired quantity to a delivery station where they are stored, delivery being completed when there is correspondence between the counter output and the stored signals. A delivery station is selected by operating the corresponding push-button at the office to initiate transmission of the selection train in which appropriate ones of a number of code steps are sent as long pulses. The desired quantity or "set point" is transmitted in binary-coded decimal form and is stored in the set-point registry at the selected station. The flow meter drives a relay counting chain, counting in binary-coded decimal, until correspondence is obtained, whereupon the set point and delivery match (comprising a network of contacts of the counter and registry relays) causes the delivery valve to be closed. The office also includes means for interrogating and resetting the remote stations either individually or together. A read-out request is transmitted by sending a long pulse in the read-out code step pertaining to the - station to be interrogated, this being detected at the selected station and causing the counter output to be returned to the office for storage and display. Provision is made for delaying read-out while a pulse from the flow meter is being registered. Actuation of a reset button causes transmission of long pulses in both the read-out and reset code steps pertaining to the selected station, the counter being reset to zero after its contents have been returned to the office. A system read-out button at the office causes transmission of a general code to which all stations respond by returning their respective counter contents in turn. A clock pulse source may alternatively be used to read out all stations at regular intervals. The system reset button causes all stations to be read out and reset in turn. Counter Fig. 5. Each closure of a flow meter contact PDC causes operation of relays PD, PDP to supply stepping pulses to a counter comprising binary-coded decades PD1-PD8 and PD10-PD80. The first pulse energizes PD1 which completes a holding circuit and energizes auxiliary relay X, the circuit for PD1 including buses 24, 25. The second closure of PDC energizes PD2 over contact b of relay X,whereupon PD1 and X are released. After the third pulse PD1, PD2 are energized and auxiliary relay Y is picked up. The operation continues in a similar manner until the tenth pulse is delivered, relays X, Y being energized when an odd count is registered. The tenth pulse is routed to relay PD10 over back contact b of Y, front contact b of X, front contact b of PD8 and back contacts b of 10Y, 10X. The opening of back contact c of PD10 releases PD1, PD8 and X releases. The first decade PD1-PD8 then repeats the cycle for pulses 11-20 and so on, the second decades PD10-PD80 counting in like manner under control of auxiliary relays 10X, 10Y. Relay CRS is energized by a reset control signal or by the hundredth pulse routed over contacts of PD1, PD8, PD10, PD80 to open contact band interrupt the energizing circuit for the counting relays whereby the counter is restored to zero. ______