PWHT Chart Recorder - pwht solutions

The PWHT chart recorder is an instrument designed to continuously record physical or electrical parameters over time. This device uses sensors to detect changes in parameters before sending an electrical signal directly to a mechanical recording component for storage.

The Chino Temperature Recorder is an analogue alternative to digital recorders that is designed specifically for pre and post weld heat treatment processes using type K thermocouples. Contained within its rugged, cost effective mild steel case designed and built for normal site conditions.

Reliability

Reliability is of utmost importance in any heat treatment process, as it allows PWHT operators to monitor and address any potential problems during either heating or cooling stages of their heat treatment process. A reliable chart recorder also helps prevent unnecessary rework that could cost both time and money in terms of time-wasting rework or additional reworking efforts.

Chart recorders use sensors and input devices to detect changes in physical or electrical parameters, with their individual characteristics dictating how each signal is processed and recorded by the instrument. For instance, thermocouples generate voltage proportional to any difference in temperature between their junctions while capacitive humidity sensors alter capacitance as humidity levels fluctuate – these variations require tailored signal conditioning circuits within the chart recorder for accurate and reliable data recording.

An analogue alternative to digital recorders, this chart recorder offers up to twelve thermocouple inputs of all common types. You can customize the unit to meet your precise requirements before it arrives at its final destination; or manually adjust parameters manually as required. All inputs are clearly displayed on a 180 mm chart using multi coloured printing technology for easy readability in any light conditions on site. All this comes together in a durable mild steel casing to withstand normal site conditions worldwide.

Accuracy

A standard chart recorder works by receiving input signals from thermocouples and pressure sensors, which generate voltage in response to changes in temperature or pressure levels. These voltages are processed to generate chart marks on paper using pen or styli that accurately represent temperature or pressure changes on graph. A pen or stylus then physically records these marks onto paper for future reference – providing a precise representation of changes on a graph.

Accuracy in standard chart recorders depends upon sensor type and environmental conditions. A well-engineered recorder should include signal conditioning circuits to optimize its performance in its intended application, using chart paper designed for those conditions as well as including a stylus capable of recording accurately onto that paper.

Recorders should offer more than accuracy: they should also be sturdy enough to withstand even the harshest production environments, being Intrinsically Safe-rated for hazardous locations, and designed with corrosion-resistance features.

Reference recorders are quickly taking over as an instrument class of choice, slowly replacing older technologies like chart recorders, deadweight testers and analog pressure gauges. A reference recorder combines recording capacity, high accuracy deadweight testing capability and continuous measurement capabilities into one device that’s easier to operate and maintain than its counterparts.

Display

Chart recorders work by employing two elements – a sensing element to detect changes in the parameter being monitored and a mechanical recording component – that capture these variations on paper. The sensing element generates an electrical signal proportional to any change, amplified and then driving a pen or stylus pen onto a chart at user selected intervals tracing variations onto a chart for easy analysis. Data logs may then be printed out or displayed on an alphanumeric display for viewing or printing out.

An EL3000 series dot printing type analog recorder is an ideal solution for PWHT applications as it immediately starts recording when power and inputs are connected, is user-friendly and features large chart size as well as selectable recording timeframes and ranges. Plus, its rugged construction will withstand harsh environments while the chart paper and pen remain compatible over time for legible data over time.

Communication

Chart recorders are indispensable tools for monitoring physical or electrical parameters over time. These devices present recorded data in real-time graphic format, making it easier for users to spot trends or potential anomalies and identify problems within processes quickly. Furthermore, chart recorders are capable of detecting input signals such as temperature from thermocouples, pressure from strain gauges and humidity capacitive sensors; all this input information is processed before being driven via pen/stylus into chart paper for recording purposes.

These instruments often include multi-coloured printing systems for clear identification of each input trace, enabling an operator to monitor their process in any site lighting conditions. Other features may include reduced mechanical parts count, input open circuit alarms, date/time printing capability and date/time stamping functionality – features that help reduce costly rework that mechanical recorders often cause.

High-quality pwht chart recorders are designed to withstand environmental conditions, such as temperature and humidity levels that it will be exposed to, in order to ensure its performance in an ideal working environment. Furthermore, such recorders also feature mechanisms designed to withstand pen or styluses that abrade the pen/stylus, essential for accurate recording; additionally they have internal memory backup in case power fails and data may become inaccessible.