Series 21 pressure transmitters, ranges 200mBar to 1000 Bar, gauge, absolute.

Piezoresistive Transmitters Series 21 / R / Pro for Industrial Applications
Series 21: Class 0,5 %
Series 21 PRO: Class 0,5% of Basic Range (BR). Programmable.

The KELLER Series 21/21PRO are extremely reliable and cost effective pressure transmitters. These pressure transmitters use a programmable KELLER-ASIC microchip called "ProgRes" (programmable resistors). The "ProgRes" chip enables the transmitters to be set up and calibrated using automated test equipment, for improved product quality and lower costs. The PRO versions also have the unique feature that they can be programmed or re-ranged by the end user, via the hand held PP-96 programmer. Since its first introduction in 1989, the Series 21/21PRO was an immediate success, thousands of transmitters and hundreds of programmers are in daily service worldwide.

Series 21 R: Class 1 %

This new range of KELLER OEM pressure transmitters and transducers offers the user the high accuracy and stability of the KELLER piezoresistive pressure capsule in a low cost OEM package. Applications include refridgeration, hydraulic controls, air compressors, ink jet printers, vacuum pumps etc.