1. General Introduction
It transfers the analog input signal to the safe area as an isolated current value. Digital signals may be superimposed on the input signal in the hazardous or safe area and are transferred bi-directionally. If the HART communication resistance in the loop is too low, the internal resistance of 250 Ω 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-Ex2
Model | KFD2-STC4-Ex2 |
General specifications | |
Signal type | Analog input |
Functional safety related parameters | |
Safety Integrity Level (SIL) | SIL 2 |
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 | ≤ 2.7 W |
Input | |
Connection side | field side |
Connection | terminals 1+, 3-; 4+, 6- |
Available voltage | ≥ 16 V at 20 mA, terminals 1+, 3 |
Input signal | 0/4 ... 20 mA |
Output | |
Connection side | control side |
Connectio | terminals 7-, 8+; 10-, 11+ |
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 |
Influence of ambient temperature | 0.25 μA/K |
Frequency range | field side into the control side: bandwidth with 0.5 Vpp signal 0 ... 7.5 kHz (-3 dB) control side into the field side: bandwidth with 0.5 Vpp signal 0.3 ... 7.5 kHz (-3 dB) |
Rise time/fall time | 20 μs |
Settling time | 200 μs |
Galvanic isolation | |
Output/power supply | functional insulation, rated insulation voltage 50 V AC |
Output/Output | functional insulation, rated insulation voltage 50 V AC |
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 | UL 61010-1:2012 |
Ambient conditions | |
Ambient temperature | -20 ... 60 °C (-4 ... 140 °F) |
3. Connection
4. Assembly
