The Additel 209 and 210 series loop calibrators are handheld tools designed to combine ease of use with high functionality, making them ideal for troubleshooting and calibrating process loops . The ADT209 offers 0.03% of reading accuracy, while the ADT210 provides higher precision with 0.01% of reading accuracy .

These calibrators are capable of measuring, sourcing, and simulating mA signals (0 to 24 mA range, 1 µA resolution), as well as measuring DC voltage (0 to 30 V, 1 mV resolution) and testing switches . They feature a large, easy-to-read LCD display (52 x 52 mm) that simultaneously shows the measurement along with the percentage of span, providing clear and immediate insight into loop performance . With a push of a button, users can switch between zero and span values, and utilize auto ramp and auto step functions throughout the range for efficient testing .

Designed for practical use, the ADT209 and ADT210 include a HART 250 Ω resistor that can be set in series with the 24V loop power, ensuring compatibility with HART instruments . They offer selectable ramp and step functions, and are built with a rugged, handheld design suitable for field use. The devices operate on a standard 9V alkaline battery with superior battery life—up to 50 hours in measure mode and 18 hours in output mode (12 mA/500Ω load) .

Each unit comes with an ISO 17025 accredited calibration certificate with data, ensuring reliability and traceability . The calibrators feature over-voltage protection up to 30V DC (240V AC) and overload current protection at 33 mA DC, with a rugged design that withstands 1 meter drops . Operating temperature range is -10°C to 50°C, with storage from -20°C to 70°C . Dimensions are 163 x 83 x 41 mm, and weight is 350 g . The instrument is backed by a 3-year warranty .