Measurement of dewpoints in the range from Testo polymer humidity sensor with high accuracy Convenient operation via the display menu Analog output 4 to 20 mA (2-wire) and optional alarm plug with 2 integrated switch outputs Compact design with rotatable housing by 350° for optimum positioning of display Display with operating menu (optional) Trace humidity adjustment without reference measuring instrument possible on site with accessory (2-point adjustment device), replaces expensive adjustment with dewpoint mirror The testo 6740 was especially developed for trace humidity measurement in compressed or dry air (e. g. granulate dryers). Thanks to a special adjustment, optimum accuracy in the trace humidity range has been achieved. The result of the development of the testo 6740 is a measuring range of -45 °Ctd to +30 °Ctd and excellent accuracy. For the display of the relevant trace humidity parameters, a freely scalable analog output is available, optionally with a switch contact plug for MAX monitoring. In addition to this, the testo 6740 stands out thanks to its compact and user-friendly design, such as the rotatability of the housing by 350° for the optimum positioning of the display. • Refrigeration dryers Membrane dryerser Adsorption dryers Granulate dryers

Technical data Subject to change without notice.

Technical drawings Installation depth © Standard connection plug (4 to 20 mA - 2-wire) A Switch contact plug: cable connection plug for Subject to change without notice.

Connection plan With standard plug (included in delivery 0555 674x): Standard plug This version provides a 4 to 20 mA analog output in 2- wire technology. With switch contact plug (0554 3302) Relais board wire (connected ex-works) Current signal (connected with Relay board terminals Connect shield The supply connections must be galvaically connected, I. e. make connection @-@ or ®-@ ! Switch contact plug (0554 3302) 4 to 20 mA, 2-wire as well as 2 potential-free switch contacts + 2 LED Relay board Order data testo 6740 Basic instrument (incl. plug for analog signal output) testo 6741, G1/2 thread,...