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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
Flameproof enclosure and Intrinsically safe base unit refer to Tabl e 2- 2 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)
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
• 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)
• 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.