Differential Pressure (ΔP) Transducer Installation
When ordered as part of a meter system with a LCR-II, Liquid Control’s ΔP transducer is wired to the LCR-II at the factory. The ΔP transducer can also be ordered separately and installed onto a meter system already in service. Refer to the ΔP transducer manual for complete installation instructions. Instructions for wiring the ΔP transducer to the LCR-II can be found below.
The ΔP Transducer requires an additional board (PN 81944) that mounts directly to the LCR-II CPU board.
Typically, a ΔP transducer operates together with a shutdown device, such as a valve or a dead-man.
Shutdown Device Current |
The shutdown control must be wired to the LCR-II and should draw no more than 1 Amp. |
Be Especially Careful with the CPU Board |
When removing the J1 or J16 terminal from the 81944 board, hold down the right end of the main CPU board to prevent flexing. |
To wire ΔP Transducer to the LCR-II:
1.Unplug the J1, J2, and J3 terminal blocks from the LCR-II CPU board. Leave the wires in the terminals.
2.Remove the screw at the top left corner of the LCR-II CPU board.
3.Plug the 81944 board into the J1 connectors on the LCR-II CPU board.
4.Fasten the top left side of both boards to the housing with the screw provided.
5.Plug terminal block J1 into the 81944 board. Plug J2 and J3 back into the LCR-II CPU board
6.Plug terminal J16 into the 81944 board.
7.Route the ΔP transducer cable through a cable gland in a port on the back of the LCR-II. Secure the cable gland. LC recommends running the cable through weatherproof conduit.
8.Connect the four ΔP transducer wires to terminals J3 on the LCR-II CPU board and J16 on the 81944 board.
•Black to J3 terminal 46
•White to J3 terminal 51
•Yellow to J16 terminal 57
•Blue to J16 terminal 58
•Red to J16 terminal 59
9.Run the red jumper wire (provided with the ΔP transducer kit) from the J8 terminal 32 to J16 terminal 59 (+5 V).
10.Route a two-wire cable from the shutdown control device through a cable gland in a port on the back of the LCR-II. Secure the cable gland. LC recommends running the cable through weatherproof conduit.
11.Connect the two wires from the shutdown control device to terminal block J13, terminals 14 and 15.
