Emerson Rosemount 3812 Installation Manual page 17

Installation manual
00825-0100-3812
Table 1-2: Meter specifications
Liquid Ultrasonic Flow Meter specifications
Power
Temperature flameproof transmitter
electronic enclosure and base electronic
enclosure
Installation manual
(continued)
Meter
• 10.4 VDC to 36 VDC measured at the
meter terminals
• 11 W maximum 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 100 Mbps
Frequency (see
• 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
• Ambient: -40 °F to 140 °F (-40 °C to 60
°C)
• Storage: -58 °F to 185 °F (-50 °C to 85 °C)
Note
The transmitter electronics enclosure and
base enclosure must be remote mounted if
the operating temperature exceeds 140 °F
(60 °C).
Introduction
January 2023
Table 3-1)
17