K121 Signal Converter

4-20mA Output Loop Powered Signal Converter and isolator

K121 is a slim programmable signal converter and signal isolator. It is powered by the 4-20mA output loop which requires 7 to 32 VDC and is programmable for a variety of process input signals which include R, S, T, J, N, K thermocouple, PT100, PT1000, 0-10 KOhm, (0) 4-20mA & 0-10V. The K121 provides galvanic isolation between the input and the output to 1.5KV

K121 Input Signals

Typical K121 Signal Converter Application

The K121 signal conditioner accepts a universal input from temperature sensor, flow transmitter, tank level sensor etc and coverts to 4-20mA signal. The PLC in this case provide the voltage for the loop. K121 can also be used to connect 2 active 4-20mA loops.

Z170REG-1 Signal Splitter Connections

K121 Set Up

K121 signal converter is set 4-20mA input 4-20mA output as default. The input can be re-configured using the EASY USB programmer and a standard windows based PC.

K121 Signal Converter Specification

Power supply 7..30 Vdc (from loop 4..20mA)
Hot swapping Yes
Current consumption 24 mA
Power consumption <660 mW
A/D Conversion 16 bit
Rejection 50 o 60 Hz (configurable)
Settings software (EASY)
Filter Added for stable reading
Dimensions (w x h x d) 6,2 x 93,1 x 102,5 mm
Isolation 1,5 KVac (2-way)
Isolation technique Digital (optocoupler)
Data processing 32 bit floating point
Enclosure PBT
Weight 45 g
Operating temperature -20..+65 degreeC
Connections 8 Clamp terminals
Protection degree IP 20
Precision class 0,10%
Thermal drift < 120 ppm/K
Special functions Cold junction compensation
Reversed output
Approvals CE, II 3G Ex nA IIC T4 Gc X, II 3D Ex tc IIIC T135 degreeC Dc X
Norms Safety (EN 61010-1), EMC (EN 61000-6-2, EN 61000- 6-4, EN 61000-4-2, EN 61000-4-3, EN 61000-4-4, EN 61000-4-5, EN 61000-4-6, EN 61000-4-11), Atex (EN 60079-0, EN 60079-15)
INPUT SIGNAL: Type THERMOCOUPLE J, K, R, S, T, E, B, N (EN 60584)
RTD (PT100, PT500, PT1000, NI100) connection 2,3,4 wires
Voltage (V) +/- 30V, impedance 200 kohm
Voltage (mV) +/-150 mV, impedance 10 Mohm
Current: +/-24 mA, impedance 40 ohm
Potentiometer: 500 ohm..10 Kohm
Resistance: up to 1760 ohm
OUTPUT DATA:
Channels 1
Type CURRENT 4..20mA
Response time (10-90%) 140..620ms

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