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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 (
see Table 3-1)
• 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
Temperatu re
flameproof transmitter
electronic enclosure and
b
ase 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
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: Th
e process temperature must not exceed the operating temperature range of
the transducers.
Note: L
T-10 transducers are designed for 4 inch to 10 inch meters. LT-11 transducers are designed
for 12 inch and larger meters.
Note: Th
e 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.
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 (
see Figure 1-7)
Table 1-2 Meter specifications