4-20 mA Current Output Transmitter &
Totalizer for 0-1 mA, 4-20 mA or 0-10V

• Isolated 4-20 mA or 0-10V transmitter output, selectable
• Output tracks rate or total
• 0-1 mA, 4-20 mA or 0-10V process signal input
• Output accuracy maintained for narrow or wide spans
• Selectable square root for differential flow
• Output resolution:  0.0015% of span (16 bits)
• Output accuracy: ±0.02% of span
• Output update rate: 25/sec
• DIN rail mount package only 22.5 mm thick
• Detachable screw clamp plug connectors
• Easy setup with PC-based Instrument Setup Software
• 5V, 10V or 24V dc sensor excitation output, isolated
• Dual solid state relays for alarm or control, isolated
• RS232 or RS485 serial communications, isolated
• Universal AC power, 85-264 Vac
• Priced Reasonably (basic totalizer transmitter)
  Options:
• Extended Main Board for custom curve linearization,
  time based on rate (1/rate)
• Low voltage power, 10-48 Vdc or 12-30 Vac

The Micron 4-20 mA output, process signal input totalizing transmitter accepts 0-1 mA, 4-20 mA or 0-10V signals from flow meters and other transducers, such as watt meters, to track rate or totalized rate.

• With a Standard Main Board, the transmitter output can track rate (such as gallons per minute or watts) or totalized rate (such as gallons or kilowatt hours) whether the transducer output is linear or requires square root extraction (differential pressure flow transducers).
  
• With an Extended Main Board, the transmitter can also perform custom curve linearization (provided by a curvilinear spline fit with up to 180 data points), display 1/ rate (such as the time it takes a conveyor to pass through an oven), and perform batch control for repetitive fill operations.  Such applications typically make use of optional dual solid state relays, which are available as options. External reset of totals is provided by a special connector.

A signal conditioner board converts the full-scale 0-1 mA, 4-20 mA or 0-10 V analog signal to a frequency of 10 kHz to 110 kHz. This frequency is determined by measuring period over a selected gate time (from 10 ms to 200 s) and taking the inverse of period. At the lowest frequency of 10 kHz and the minimum gate time of 10 ms, the transmitter is capable of 25 updates per second. Scaling is done mathematically. Totals are stored in nonvolatile memory in case of power loss.

Three analog transmitter settings are jumper selectable: 4-20 mA, 0-20 mA or 0-10V. All selections provide 16-bit (0.0015%) resolution of output span and 0.02% output accuracy. The output tracks the reading from -99,999 to +99,999 counts that would be transmitted digitally. For process signals, this reading has a rated accuracy of ±0.01% of full scale input and can be scaled in software. Output isolation from signal and power grounds eliminates potential ground loop problems. The supply can drive 20 mA into a 500 ohm (or lower) load for 10V compliance, or 10V into a 5K ohm (or higher) load for 2 mA compliance.

Standard features of Micron transmitters include:

• Analog transmitter output, 16-bit, user scalable and isolated. User selectable 4-20 mA, 0-20 mA or 0-10V levels.
• Serial communications, isolated. User selectable RS232 or RS485, half or full duplex, Modbus or Micron ASCII protocol.
• Dual solid state relays for control or alarm, isolated. Rated 120 mA at 130 Vac or 170 Vdc.
• Transducer excitation output, isolated. User selectable 5V@100 mA, 10V@120 mA or 24V@50 mA.
• Universal AC power supply for 85-264 Vac.

Easy Transmitter programming is via Micron's Instrument Setup Software, which runs on a PC under MS Windows. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from Micron (P/N CBL04).