Thermocouple CJC Method

Dataforth - Thermocouple CJC Method   Advanced CJC Method Used in Dataforth Thermocouples Improves Accuracy As a result of the advanced method of Cold Junction Compensation (CJC) used in Dataforth Corporation's MAQ20 thermocouple modules, the accuracy of these modules is significantly better than that offered by competing models. Dataforth MAQ20 Thermocouple Modules The Dataforth [...]

By | December 11th, 2017|Dataforth, Releases|

Signal Conditioner Filtering Noise

Signal Conditioner Filtering Noise Signal conditioning modules, SCMs, used for measuring process control variables such as temperature, pressure, strain, position, speed, level, etc. are always subject to externally induced noise signals. Noise sources in the form of electro-magnetically induced voltages (or currents) in industrial measurement and control systems are inevitable. Most noise [...]

By | December 11th, 2017|Dataforth, Releases|

Signal Conditioning Accuracy vs Resolution

Signal Conditioning Accuracy vs Resolution Preamble System error budgets should be developed and analyzed as an integral part of system designs. System engineers must determine the necessary levels of accuracy for system elements such as field sensors, actuators, signal conditioning modules (SCMs), and controlling units (PCs and PLCs). In addition, software algorithm [...]

By | December 11th, 2017|Dataforth, Releases|

Hardware Linearization of Non-Linear Signals

Hardware Linearization of Non-Linear Signals   Many sensors used in industry exhibit a deviation from an ideal (linear) relationship between input and output. For example, a given change in temperature does not give rise to the same change in emf for most thermocouples when measured over different temperature ranges. Sensors or signals [...]

By | December 11th, 2017|Dataforth, Releases|

Normal Mode Rejection, NMR

Normal Mode Rejection, NMR The operational amplifier (OP Amp) with differential inputs is an essential component in industrial signal conditioning modules, SCMs. Half a century ago designs using OP Amps were very costly and not suited for industrial environments. Today, modern silicon monolithic semiconductor circuits provide the opportunity to design low cost, [...]

By | December 11th, 2017|Dataforth, Releases|

Unbalanced Voltages Increase Cost

Unbalanced Voltages Increase Cost The electric 3-phase induction motor is the work horse of industry and represents a significant portion of industry’s electrical utility cost. Plants with a large population of 3-phase induction motors can easily have electric utility bills in excess of several million dollars per year. As an example of [...]

By | December 11th, 2017|Dataforth, Releases|

Dataforth Protecting Signal Lines Against Electromagnetic Interference

Dataforth Protecting Signal Lines Against Electromagnetic Interference In today’s dynamic industrial environments, electronic devices, signal and power wiring, and other electrical plant/process equipment often interact to create “noise” or electromagnetic interference (EMI) problems which can degrade critical measurement and control signals. Proper grounding and shielding techniques can help reduce or eliminate these [...]

By | August 3rd, 2017|Dataforth, Releases|

Tuning Level Control Loops – Dataforth Application Note

Dataforth Tuning Level Control Loops Dataforth Application Note Preamble The original Ziegler-Nichols tuning methods published in 1942 aimed for a super-fast speed of response at the expense of control loop stability. However, with a slight modification of their tuning rules, the loop stability can be improved. This comes at the expense of [...]

By | June 20th, 2017|Dataforth, Releases|

Dataforth Introduction to PID Control – Dataforth Application Note

Dataforth Introduction to PID Control - Dataforth Application Note Preamble PID controllers are used in most automatic process control applications in industry. They can regulate flow, temperature, pressure, level, and many other industrial process variables. This Application Note reviews the design of PID controllers and explains the P, I, and D control [...]

By | April 11th, 2017|Dataforth, Releases|