4-20 mA Current to Voltage Converter

Slide 1

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4-20 mA Current to Voltage Converter

Precision resistors are often used in 4 to 20mA current loop circuits for sensing and control applications. The 4 to 20mA current loop is a common standard used in industrial instrumentation and control systems, where the current value represents the process variable being measured or controlled.

In a 4 to 20mA current loop:

● 4mA represents the minimum value or the “zero” point of the process variable.

● 20mA represents the maximum value or the “span” of the process variable.

● Any value between 4mA and 20mA corresponds to the range of the process variable being measured or controlled.

Precision resistors play a crucial role in this current conversion process. These resistors are carefully manufactured to have a very accurate and stable resistance value. The resistors are typically used in the following ways:

● Current Sensing Resistor (Shunt Resistor)

● Current Limiting Resistor

●Reference Resistor

When selecting precision resistors for 4 to 20mA current conversion, the following factors are important:

● Resistance Tolerance

● Temperature Coefficient

●Power Rating

●Long-Term Stability

●Environmental Considerations

Series	Description	Resistance Range	Tolerance	TCR ppm/°C	Rated Power @70°C
AA	Termination resistor, 0.2" Lead pitch	10Ω to 1MΩ	±0.05% to ±1%	±3 to ±25	0.25W
BA	Termination resistor, 0.2" Lead pitch	10Ω to 1MΩ	±0.05% to ±1%	±3 to ±25	0.5W
SAA	Radial lead, 0.2"Lead pitch	10Ω to 1MΩ	±0.05% to ±1%	±5 to ±50	0.25W
LSAA	Radial lead, 0.2"Lead pitch	10Ω to 1MΩ	±0.05% to ±1%	±5 to ±50	0.25W
SCA	Radial lead, 0.1"Lead pitch	10Ω to 330KΩ	±0.05% to ±1%	±5 to ±50	0.16W
LSCA	Radial lead, 0.1"Lead pitch	10Ω to 330KΩ	±0.05% to ±1%	±5 to ±50	0.16W
VSM	Wraparound chip resistor	5Ω to 125KΩ	±0.01% to ±1%	±2	0.1W to 0.4W
VSMP	Improved wraparound chip resistor	5Ω to 125KΩ	±0.01% to ±1%	±0.2	0.1W to 0.75W
SMR1D & SMR3D	Molded chip resistor	5Ω to 80KΩ	±0.01% to ±1%	±2	0.25W to 0.6W
SMR1DZ & SMR3DZ	Low TCR molded chip resistor	5Ω to 80KΩ	±0.01% to ±1%	±0.2	0.25W to 0.6W
S-series(C-Foil)	High Performance Instrumentation Resistors	0.5Ω to 1MΩ	±0.005% to ±1%	±2	0.4W to 2W
S-series(K-Foil)	High Performance Instrumentation Resistors with improved tcr	0.5Ω to 1MΩ	±0.005% to ±1%	±1	0.4W to 2W
Z-series	High Performance molded resistor	10Ω to 600KΩ	±0.005% to ±1%	±0.2	0.6W to 2W
Z-201	Molded Resistor - Drop-in replacement for S102C	10Ω to 100KΩ	±0.005% to ±1%	±0.05	0.6W
Z-202	High performance miniature resistor	5Ω to 30KΩ	±0.01% to ±1%	±0.2	0.25W
Z-203	Z1- Foil resistor for Metrology and Laboratory Applications	10Ω to 100KΩ	±0.005% to ±1%	±0.5	0.6W
E102	High Ohmic Value, Small Size Resistor	150KΩ to 300KΩ	±0.005% to ±1%	±2	0.6W
E102Z	Low TCR High Ohmic Value, Small Size Resistor	100KΩ to 250KΩ	±0.005% to ±1%	±0.2	0.6W
RCK	High Performance Instrumentation Resistors	0.5Ω to 1MΩ	±0.005% to ±1%	±2	0.4W to 2W
DSM	SMD molded voltage divider	100Ω to 20KΩ	±0.01% to ±0.05%	±2	0.05W per element
DSMZ	SMD molded voltage divider	100Ω to 10KΩ	±0.01% to ±0.05%	±0.2	0.05W per element
SMN	4- Resistor Network Dual-In-Line Molded Package 50 MIL Pitch	100Ω to 20KΩ	±0.01% to ±0.05%	±2	0.1W per element
SMNH	4-Resistor Surface Mount Hermetic Network	5Ω to 33KΩ	±0.005% to ±0.01%	±2	0.1W per element
SMNZ	4-Resistor Surface Mount Network Dual-In-Line Molded Package	100Ω to 10KΩ	±0.01% to ±0.05%	±0.2	0.1W per element
VFCD 1505	Flip Chip Resistor, Special Design	1KΩ to 10KΩ	±0.01% to ±0.05%	±0.1	0.1W per element
VFD244	Voltage Divider Resistor	1Ω to 150KΩ	±0.005% to ±1%	±2	0.1W for entire packege divided proportionally between the two elements
VFD244Z	Ultra High Precision Voltage Divider Resistor	1Ω to 100KΩ	±0.005% to ±1%	±0.2	0.1W for entire packege divided proportionally between the two elements