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The Testo 6744 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 6744 is a measuring range of -45 °Ctd to +30 °Ctd and excellent accuracy.
For the display of the relevant trace humidity parameters, the Testo 6744 has a freely scalable analog output is available, optionally with a switch contact plug for MAX monitoring. In addition to this, the 6744 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.
| Functions | Specifications |
| Housing | |
| Dimensions | 199.5x37x37 (with standard plug) 203.5x37x37 (with limit signal output plug) |
| Ambient temperature | -20 to 70 °C |
| Storage temperature | -40 to 80 °C |
| Protection class | IP 65 |
| Rotation of housing | By 350° (to align display) |
| Sensor and Sensor Protection | |
| Humidity sensor | Testo humidity sensor with protocolled trace humidity adjustment at -40° Ctpd |
| Temperature sensor | NTC |
| Sensor protection | Stainless steel sintered cap |
| Measurement Range | |
| Pressure dew point temp. (trace humidity) | - 60 to +30 °Ctpd |
| Temperature | 0 to 50 °C |
| Pressure resistance | - 1 bar relative to 50 bar |
| Meas. range of atmospheric dew point | 80 to - 15 °Ctd (at 30 bar rel.) 70 to + 10 °Ctd (at 3 bar rel.) 60 to + 30 °Ctd (at 0 bar rel.) |
| Measurement Inaccuracy | |
| Time constant/damping | 0/1/2.5/5/10/20/30/40 sec., can be set by customer, default setting 2.5 s |
| Humidity | +/- 1 K at -10 °Ctpd +/- 4 K at -40 °Ctpd (each at 25 °C) |
| Temperature | +/- 0.5 K (0 to 50 °C) |
| Analog Output | |
| Signal | 4 to 20 mA, 2 wire technology |
| Scaling | Freely scalable via display/buttons Standard: 4 to 20 mA = -60 to +30 °Ctpd |
| Output variables | °Ctpd, °Ftpd, °Ctd, °Ftd, %RH, ppmV, mg/m3, °C, °F |
| Accuracy | +/- 40 µA |
| Power | |
| Voltage | 24 VDC (10 to 30 VDC maximum; 20 to 30 VDC with limit signal outputs) |
| Max. load | 10 VDC: 100 Ohm, 30 VDC: 950 Ohm |