Temperature measurements using a thermocouple means measuring voltage in the microvolt range. The ES620 captures signals from temperature sensors via 16 channels that are electrically isolated from each other and from the supply voltage to achieve a consistently high common-mode rejection. This ensures maximum measuring accuracy even with non-potential-free thermocouples.

A separate ice point reference at each input connector significantly minimizes the measurement error, even when ambient temperatures are fluctuating (e.g., due to strong sunlight). The ES620 supports type B, E, J, K, N, R, S, and T thermocouples covering a measuring range of -210°C to +1820 °C (-346°F to +3308°F). The module operates at a resolution of 21 bit over the entire range, which allows a minimum measurement unit of 0.01°C with a basic accuracy of +0.25°C (K type). Temperature signals often only vary very slowly. A high sampling rate would cause redundant data which again would needlessly strain transfer channels and memory ressources. To avoid this, software filters and sampling rates can be optimized separately for each module.

Functions at a Glance

• 16 electrically isolated measuring channels for temperature sensors
• Measuring channels electrically isolated from the supply voltage
• Adjustable acquisition rate per channel; 10 samples/s to 0.1 samples/s
• Parameterized software filter for signal smoothing
• High measuring accuracy through 21-bit resolution
• Automotive measuring range of -210°C to +1820°C (-346°F to +3308°F)
• Use of B, E, J, K, N, R, S and T thermocouples
• Data transfer to PC via Ethernet
• Rugged, functional metal housing
• Hardware calibration service