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Daniel 3818 LNG Liquid Ultrasonic Meter Installation Manual Section 1: Introduction
3-9000-771 Rev A May 2012
Meter specifications 9
Electronic specifications
Power Meter
• 10.4 VDC to 36 VDC
• 11 W typical power consumption
Serial cable
• Belden #9940 or equivalent (22 gauge)
— Capacitance (pF/m) 121.397 (conductor to conductor)
— Capacitance (pF/m) 219.827 (conductor to other conductor and shield)
— Resistance (DC) DCR @ 20°C (Ohm/km) 48.2307
Nominal Outer shield resistance - DCR @ 20°C (Ohm/km) 16.405
— Operating voltage - 300 V RMS (UL AWM Style 2464)
— Current 2.4 Amps per conductor @ 25°C (recommended)
Ethernet cable
• Cat-5 Standard 100Mbps
Frequency (
see Table 3-5)
• 22 AWG wire characteristics are as follows:
— Capacitance = 20 pF/ft or 20 nF/1000 ft (between two wires)
— Resistance = 0.0168 Ohms/ft or 16.8 Ohms/1000 ft
— Pull-up voltage is 24 VDC
Temperature
flameproof Transmitter
Electronic Enclosure and
Base Electronics Enclosure
Transducers
• LT-07
• Operating Temperature Range -321
o
F to +140
o
F (-196
o
C to 60
o
C)
Communications specifications
Connectivity protocols One serial RS-232/RS-485 ports (115 kbps baud rate) (Modbus RTU/ASCII)
• (1) Serial Port A
(RS-232/RS-485 Full Duplex/RS-485 Half Duplex)
One Ethernet Port (TCP/IP) 100 BaseT
• Up to 10 Mbps
• Modbus TCP
Device compatibility FloBoss 103, FloBoss S600 flow computer, ROC 107
Digital, analog, and frequency inputs
Digital Input(s)
(Selectable)
(1) Single polarity (for flow calibration gating - contact closure)
• Single input for starting and stopping
• Four pulse configurations available
Analog Input(s) (2) 4-20 mA
• AI-1 Temperature
• AI-2 Pressure
Note: The analog-to-digital conversion accuracy is within ±0.05% of full scale over the operating
temperature range.
Note: AI-1 and AI-2 are electronically isolated and operate in sink mode. The input contains a
series resistance so HART® Communicators can be connected to configure sensors.
A 24 Volt DC power supply is available to provide power to the sensors.
Table 1-2 Meter specifications