Eurotherm WV428-2000.V1 Offers

Accurate and stable, this DC-powered thermocouple input-isolating signal conditioner is a high-accuracy signal conditioner with an isolated, linearized DC voltage or current output. In addition, this conditioner features Instant Accuracy™ to maximize accuracy and performance during warmup and changes in ambient temperature.

Features

• Lower power requirements with SmartPower
• Improved accuracy
• Bussed power with plug-in power clips
• Removable terminals for easy service
• Approved for use in Class I Div 2 Group A, B, C, D areas
• RoHS compliant
• DIP switch configuration

Smart Power

This signal conditioner uses Smart power to control its output supply. Smart Power automatically adjusts the voltage to drive the output loop to the required current. A low impedance current loop will subsequently require less voltage than a loop with higher impedance. Previous designs provided only a single supply at the highest voltage required to drive the highest impedance load. Using Smart Power results in power savings and reduces the operating temperature of the signal conditioner.

Approved for use in Class I Div 2 Group A, B, C, D areas

Users can now enjoy significant labor savings over traditional protection methods since there is no need for explosion proof enclosures and conduits. A Class I hazardous location is one in which flammable gases or vapors may be present in the air to be ignitable or explosive (typical applications include petroleum refineries, spray finishing areas, utility gas plants and fuel servicing areas).

A Division 2 area is one in which the flammable gases or vapors are normally not present in an explosive concentration, but could accidentally exist. Group A is acetylene; Group B includes hydrogen; Group C includes ether; and Group D includes hydrocarbons, fuels and solvents.

Instant Accuracy™

Instant Accuracy™ maximizes accuracy and performance during warmup and during changes in ambient temperature. This patented cold-junction compensation technique utilizes two temperature sensors to measure the differential temperature near the terminal block. Using heat transfer calculations with the measured differential temperature and the known thermal conductivity of the PCB, the terminal junction temperature is determined with extreme accuracy. Even during unstable thermal states such as start-up, ambient temperature changes, or changing load or power, this signal conditioner performs extremely accurate thermocouple temperature measurement.

Instant Accuracy™ improves system performance and productivity due to reduced warm-up time, fewer temperature measurement errors, and tighter process control for higher quality. Most significantly, it allows calibration to be checked quickly and accurately without the effects of rapid ambient temperature changes due to opening a control panel door, which often causes erroneous readings and miscalibrations - a common cause of measurement errors.

Enhanced LED diagnostics

Other than when executing the pushbutton calibration routine, the LEDs blink under the following conditions:

An Under Range condition exists when the signal is lower than the operational low value minus 6.25% of the operational span. An Over Range condition exists when the signal is higher than the operational high value plus 6.25% of the operational span. A voltage output short circuit may cause an under range condition (RED blinking at 2 Hz rate). A current output open circuit may cause an over range condition (RED blinking at an 8 Hz rate). There could be two or more LEDs blinking at the same time, which means the module has more than one error condition. Only when all error conditions have been removed, will the LEDs be back to normal (Green ON, Red and Yellow Off).