1. General Introduction
The device supplies 2-wire and 3-wire SMART transmitters, and can also be used with 2-wire SMART current sources.
It transfers the analog input signal to the safe area as two isolated current values. Digital signals may be superimposed on the input signal and are transferred bi-directionally. If the HART communication resistance in the loop is too low, the internal resistance of 250 Ù between terminals 8, 9 and 11, 12 can be used. Test sockets for the connection of HART communicators are integrated into the terminals of the device.
2. General Specification for KFD2-STC4-1.2O
Model | KFD2-STC4-1.2O |
General specifications | |
Signal type | Analog input |
Functional safety related parameters | |
Safety Integrity Level (SIL) | SIL 3 |
Supply | |
Connection | Power Rail or terminals 14+, 15- |
Rated voltage Ur | 20 ... 35 V DC |
Ripple | within the supply tolerance |
Power dissipation | 1.8 W |
Power consumption | 2.4 W |
Input | |
Connection side | field side |
Connection | terminals 1+, 2-, 3 or 5-, 6+ |
Open circuit voltage/short-circuit current | terminals 1+, 3-: 22.7 V / 38 mA |
Voltage drop | terminals 5, 6 : ≤2.4 V at 20 mA |
Input resistance | terminals 2-, 3: ≤76 terminals 1+, 3: ≤500 (250 load) |
Available voltage | terminals 1+, 3: ≥16 V at 20 mA |
Output | |
Connection side | control side |
Connectio | terminals 7-, 8+,9; 10-, 11+,12 |
Connection | terminals 7-, 8+,9; 10-, 11+,12 |
Load | 0 ... 550 at 20 mA |
Output signal | 0/4 ... 20 mA (overload > 25 mA) |
Ripple | ≤50 A eff |
Transfer characteristics | |
Deviation | at 20 °C (68 °F), 0/4 ... 20 mA ≤± 10 A incl. calibration, linearity, hysteresis, loads and supply voltage fluctuations |
Influence of ambient temperature | ≤20 ppm/K |
Frequency range | input in output: bandwidth with 1 mApp signal 0 ... 7.5 kHz (-3 dB) output in input: band width with 1 Vss signal 0.3 ... 7.5 kHz (-3 dB) |
Settling time | 200 s |
Indicators/settings | |
Display elements | LED |
Labeling | space for labeling at the front |
Directive conformity | |
Electromagnetic compatibility | |
Directive 2014/30/EU | EN 61326-1:2013 (industrial locations |
Conformity | |
Electromagnetic compatibility | NE 21:2011 |
Degree of protection | IEC 60529:2001 |
Protection against electrical shock | EN 61010-1:2010 |
Ambient conditions | |
Ambient temperature | -20 ... 60 °C (-4 ... 140 °F) |
3. Connection
4. Assembly
