SCC301 is a dual purpose, current-to-current converter with 3-port isolation. It provides a fully floating, isolated DC supply for energising a conventional 2 or 3-wire 4~20mA transmitter/ smart transmitter and repeats the current in another isolated circuit or accepts a 4~20mA signal from a controller/source to drive loads up to 750 ohms. A 20~35VDC power supply is required for operation. The power supply terminations are at the top of the unit to enable this model to be used either as a repeater power supply or driver. For a 2-wire smart transmitter the unit also allows bi-directional transmission of digital communication signals superimposed on the 4~20mA signal so that the transmitter can be interrogated either from the operator station or by a handheld configurator.
Specification
- Number of channels : One
- Input and output signal
- 0~20 mA for normal operation
- 4~20 mA for operations with digital communication
- Isolation (mutual, between 1500 VAC RMS power supply, input and output)
- Power supply : 20~35 V DC
- LED indicator : 1 red LED indicating POWER ON
- Voltage available to 20 V minimum at 20 mA transmitter
- Digital signal bandwidth : 100 Hz ~ 10 KHz
- Maximum load resistance
- Conventional transmitters/drivers :750 ohms
- Smart transmitters : 220ohms to 650 ohms
- Voltage drop across input <0.5V from current source (terminal 5 & 6)
- Transfer accuracy at 25 °C ±0.1% of span (±20 micro Amps) (including non-linerarity and hysterisis)
- Temperature effect on <1 micro Amps / °C accuracy
- Response time 10 ms (to reach 90% of span)
- Power requirement
- 135mA max at 20V with a (supplying a transmitter) 20mA signal
- 95mA max at 35 V with a 20mA signal
- Power requirement
- 90mA max at 20V with a (current source input) 20mA signal
- 65mA max at 35 V with a 20mA signal
- Common mode rejection ratio Better than 160dB
- List of compatible devices for All HART compatible devices digital communication
Enclosure
- Material ABS plastic
- Dimensions 80(H) x 25(W) x 85(D) mm
- Mounting : Snap on for 35 mm DIN rail to DIN 46277
- Connection, single/stranded ≤ 2.5 mm², AWG 14 wires
- Weight < 200 grams
- Protection IP 20
Temperature, Humidity
- Ambient, storage -40 ~ +80 °C
- Ambient, operation -20 ~ +55 °C
- Relative humidity 5 ~ 95%
