Справочник Пользователя для Emerson Process Management 3420
Reference, Installation, and Operations Manual
Section 2: Product overview
3-9000-743 Rev S
June 2013
Electronic specifications
25
2.4
Electronic specifications
This section discusses the specifications for Daniel Mark III Ultrasonic Gas Flow Meters.
2.4.1
Power specifications
•
24 VDC nominal, range: 10.4 VDC to 36 VDC
•
total power consumption less than 8 W
2.4.2
Temperature
for temperature ranges.
Important
The process temperature must not exceed the operating temperature range of the transducers.
2.4.3
Inputs
•
one general-purpose digital input
•
optional analog inputs, one each for pressure and temperature (requires the Option
Board)
Board)
2.4.4
Outputs
•
two frequency output pairs (4 total)
•
four digital outputs
•
one optional analog output (requires the Option Board)
•
two optional analog outputs (requires the Series 100 Plus Option Board)
2.4.5
Communications
•
two serial ports (RS-232/RS-485 Full Duplex/RS-485 Half Duplex) with manually switched
RS-485 terminations
RS-485 terminations
•
optional third serial port (RS-232/RS-485 Half Duplex) with manually switched RS-485
terminations (requires the Option Board or Series 100 Plus Option Board)
terminations (requires the Option Board or Series 100 Plus Option Board)
•
one optional Ethernet port (10 BaseT)
•
The optional third serial port can be used as a Modbus master to communicate with a
Daniel Gas Chromatograph (GC) in Sim 2251 mode.
Daniel Gas Chromatograph (GC) in Sim 2251 mode.