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March 2004
Electrical
Specifications
Power Requirements
Memory
Operating Mode
Input/Output
Specifications
7-2
The electrical specifications for the Model UTX878 flow transmitter
are divided into the following categories:
15-30 VDC loop powered, 0.66 W max
Output Drive Capability:
[
Max. load (ohms)
=
50
where PSV = power supply voltage in volts DC
and Rc = cable resistance, 22 AWG cable has 0.04 ohm/ft
For example:
Given a 24-VDC power supply and a 1,000-ft cable (22 AWG,
0.04 ohm/ft),
×
Rc
=
1000 ft 0.04 ohm/ft
[
×
(
Max. load
=
50
24 15
[
×
] 40
=
50
9
–
= 410 ohms
Power Consumption:
660 mW, depending on the loop voltage and current.
In a loop-powered configuration,
Power Consumption
=
FLASH memory, field-upgradable
Correlation Transit-Time™ Mode with clamp-on transducers
Digital Display:
132 X 64 LCD, configurable to display up to 2 measurement
parameters.
Digital Communications:
Standard: RS232 serial port for PC or terminal.
Analog Output:
4-20 mA on power loop
Cable and Length:
Transducer: 6-ft, 10-ft, 15-ft, 25-ft, 50-ft, 100-ft integral
with transducer
Power: Shielded 2-wire, twisted pair, 24 gauge
Environmental:
System complies with EMC Directive 89/336/EEC, and
wetted transducers comply with PED 97/23/EC for DN<25.
×
(
)
] Rc
PSV 15
–
–
=
40 ohms
)
] 40
–
–
×
Loop current Input power supply voltage
Specifications
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