Keller Swiss-Built Series 21G Low cost industrial pressure transmitter

Piezoresistive Pressure transmitters
for industrial aPPlications
series 21 G
•  Weighing only 30 grams, the smallest known transmitter with fully welded stainless steel wetted parts
•  High EMC protection. Protection class IP65/IP67
•  Highest stability due to special heat treatment and annealing procedures
Series 21G, is the result of a 20 year long development programme for industrial transmitters. ‘G’ stands for ‘Graduate’; this product has received ‘summa cum laude’.... the highest honours. The standard mPm electrical connector overlaps the body to remind us of ‘mortar board hats’ on graduation day.
The Series 21G combines KELLER’s 30 year long experience of manufacturing industrial pressure transmitters, with all of the newest technological advantages available in the industry today.
This product incorporates the very latest techniques for welding, signal processing and circuitry, automated compensation and adjustment. Each transmitter is subjected to temperature and pressure cycles during manufacture. The laser trimming final adjustment gives unrivalled accuracies over a wide temperature range. The result is a cost-effective affordable transmitter that
has a specification better than other similarly priced products, and equal to many very expensive transmitters.
The body size is determined by the thread selected, 17 mm HEX for G1/8”, 1/8”-27NPT and 7/16”-20 UNF, and 19 mm HEX for the G1/4” thread and 1/4”-18NPT”. The Series 21G  is an OEM product, designed specifically to be built and sold in thousands only. Alternative customer specific threads, pressure ports, electrical connections and electrical outputs can be readily accommodated at little or no extra cost.The pressure ranges and temperature compensation can be adapted to suit particular applications.The following guidelines give an overview of the typical performance of the 4 most commonly used temperature ranges.Types  Absolute or sealed gauge Pressure Ranges  Min: 0...5 bar  Max: 0... 200 bar Electrical Configuration  2-wire  3-wire Output  4...20 mA  0,5...4,5 V ratiometric Excitation  8...28 V  5 V Linearity (BFSL)  typ. 0,25 %FS  max. 0,5 %FS Error Band  0...50 °C    typ. 1,0 %FS  max. 1,5 %FS
-40...20 °C  /  20...80 °C  typ. 1,0 %FS  max. 1,5 %FS
-20...80 °C   typ. 1,5 %FS  max. 2,0 %FS
-40...135 °C  typ. 2,0 %FS  max. 3,0 %FS

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