Daniel 3818 LNG Liquid Ultrasonic Meter Installation Manual

Section 3: Electrical installation

3-9000-771 Rev A

May 2012

 

 

 

3.5Wiring and I/O

Daniel MeterLink uses the TCP/IP protocol to communicate with the 3818 LNG Liquid Ultrasonic Flow Meter electronics instead of Modbus ASCII or RTU. The TCP/IP protocol only works across either Ethernet, RS-485 full duplex (i.e., 4-wire), or RS-232. Daniel MeterLink can communicate with multiple meters if they are multi-dropped using 4-wire full duplex RS-485 mode. The meter electronics is HART capable and provides communication flexibility with Daniel 3818 LNG Liquid Ultrasonic Flow Meters.

The HART® output provides communication with other field devices (e.g., Field Communicator and AMS™ Device Manager software) and ultimately, communicates key diagnostic information through PlantWeb® architecture.

If not using Ethernet, a full duplex serial connection is necessary for Daniel MeterLink to communicate with a Daniel 3818 Liquid Ultrasonic Meter.

The Daniel 3818 LNG Liquid Ultrasonic Flow Meter has two 3814 electronics enclosures and auto-detects the protocol used and automatically switches between TCP/IP, Modbus ASCII, and Modbus RTU so it is not necessary to make any meter configuration changes to change the protocol.

Two sets of transmitter electronics (co-located) are provided with the Daniel 3818 LNG Liquid Ultrasonic Flow Meter. The Primary (master) electronics are in the upstream enclosure with the serial tag marked _H1. The Secondary (slave) electronics are in the downstream enclosure with the serial tag marked _H2.

Note:

Daniel recommends running conduit and field wiring to each of the co-located Transmitter Electronics Enclosures and wiring each of the meters.

Wiring and I/O

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