20904-00

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Panel Meters - Counters, Hour Meters encompass a wide range of instruments used for measuring and displaying varied electrical parameters, including voltage, frequency, phase, and amperage. The devices come in various styles and sizes to fit into almost any control panel application and drawing instrument power from either ac or dc sources. The 20904-00 application field and working principle is one such device which offers precise, cost-effective measurement of ac and dc currents, with characteristics which make it versatile enough to suit both industrial and consumer environments.

AC/DC Current Measurement

The 20904-00 is a digital panel meter which provides general-purpose current measurement in both AC and DC circuits. The user can select different measurement ranges from 0-5A (DC) to 0–15A (AC). An LED display allows for easy reading in bright or dimly lit environments, with the meter’s circuit design providing necessary noise filtering to ensure accuracy. The 20904-00 has a full power scale over the adjustable range, with a 20ms response time after power up or disturbance of the magnetic field.

Automatic Zero Adjustment

The 20904-00, like other panel meters, is engineered to provide optimal accuracy under varying environmental conditions. The internal design accommodates for environmental temperature fluctuations and other factors, allowing the unit to be set up with minimal difficulty. It integrates an adjustable zero adjust feature which can automatically adjust the indication to within 0.1mA of the nominal value. This feature further increases the accuracy of the device for applications which experience considerable temperature fluctuations.

Pulse Output & SSR Compatibility

The 20904-00 comes with a built-in pulse output function, allowing for integration into systems relying on contactless switches. A single pulse is generated for each full-scale measuring cycle and the pulse is virtually immune to electrical interference.This feature also makes the 20904-00 compatible with standard solid-state relays (SSRs), enabling energy saving strategies such as increasing the SSR dwell time as the load declines. As the load varies the pulse output can be programmed to stay open or closed, with the user able to set the response time.

Automatic & Manual Ranging

The 20904-00 offers both automatic and manual ranging capabilities. In manual ranging, the user can choose to measure any AC/DC current from 0-5A or 0–15A in two selectable directions. This range can be set in 0.1A increments, with the accuracy of ±0.3% up to 10A, rising up to ±3% over 10A. The automatically ranging feature functions best when the user is unaware of the existing current levels, enabling the system to choose the ideal range. Operating from a power supply of +7.5 – 18V DC, the 20904-00 requires only minimal board space, making it suitable for installations requiring space saving.

NEMA 4X & UL Certified

The 20904-00 is engineered to be used in industrial settings and has certification to UL508 and NEMA 4X standards. The instrument is protected from dust, water and corrosive liquid spray, with the IP65 rating allowing for use in harsh environmental conditions. Additionally, the meter is equipped with protection against excessive power supply overload and can be fitted with a terminal board cover for added safety. The unit is designed for enclosure installation, and base mounting can be used with a 140°C temperature range.

Conclusion

The 20904-00 is a reliable and accurate digital panel meter which can be used in industrial and consumer environments. Its ability to accurately measure currents in AC and DC circuits, and its versatility in terms of settings and arrangement make it a complete solution for applications which require current measurement. Additionally, the meters’ NEMA4X and UL certified ratings enable it to easily integrate into modern, safety-focused industrial control panels.

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