Emerson 3812 User Manual
Daniel 3812 Liquid Ultrasonic Flow Meter Installation Manual
Section 1: Introduction
3-9000-765 Rev D
March 2013
Meter specifications
15
Electronic specifications
Power
Meter
•
10.4 VDC to 36 VDC measured at the meter terminals
1
•
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 100Mbps
Frequency (
)
•
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
flameproof transmitter
electronic enclosure and
base electronic enclosure
base electronic enclosure
•
Ambient: -40
o
F to 140
o
F (-40
o
C to 60
o
C)
•
Storage: -58
o
F to 185
o
F (-50
o
C to 85
o
C)
Note: The transmitter electronics enclosure and base enclosure must be remote mounted if the
operating temperature exceeds 140
o
F (60
o
C).
Transducers
•
LT-10 and LT-11 Operating temperature range with NBR O-rings
-58
-58
o
F to +275
o
F (-50
o
C to 135
o
C)
•
LT-10 and LT-11 Operating temperature range with FKM O-rings
-40
o
F to +302
o
F (-40
o
C to +150
o
C)
Note: The process temperature must not exceed the operating temperature range of
the transducers.
Note: LT-10 transducers are designed for 4 inch to 10 inch meters. LT-11 transducers are designed
for 12 inch and larger meters.
Note: The ultrasonic transducers are not intended for use across boundary walls of different
hazardous area classifications. The transmitter electronics cannot be remote mounted from
a Division 1 classification to a Division 2 area to meet an area classification.
a Division 1 classification to a Division 2 area to meet an area classification.
Acquisition Cable
•
Total cable length between the Acquisition Module and ultrasonic transducers must not
exceed 15 feet (4.7 meters) when using the remote mount option (
exceed 15 feet (4.7 meters) when using the remote mount option (
)
Table 1-2 Meter specifications