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Testo 6742 Dew Point Transmitter (1/2 NPT) - 0555 6742
Item #:
0555-6742
Brand:
Testo
Share this product:
0555 6742 Dew Point Transmitter (1/2 NPT) by Testo
The testo 6740 was especilally 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 userfriendly design, such as the rotatability of the housing by 350° for the optimum positioning of the display.
- Measurement of dewpoints in the range from -45 °Ctd to +30 °C
- Testo polymer humidity sensor with high accuracy and longterm stability
- 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)
Measurement parameters |
||
| Dewpoint/trace humidity | ||
| Units | %RH, °C | |
| Calculated parameters | °Ctd, °Ftd, °CtA, °FtA, ppmv, mg/m3, °F | |
| Measuring range | -45 °Ctd to +30 °Ctd | |
| Measurement uncertainty | ±1 K at 0 °Ctd (+32 °Ftd) ±3 K at -20 °Ctd (-4 °Ftd) ±4 K at -40 °Ctd (-40 °Ftd) |
|
| Response time | t90 <= 60 sec for change from 13.2 °Ctd to
-32.1 °Ctd t90 <= 17sec for change from -32.2 °Ctd to 13 °Ctd |
|
| Sensor | Polymer humidity sensor with protocolized trace humidity adjustment at -40 °Ctd (-40 °Ftd) | |
| Normed atmospheric dewpoint | ||
| Measuring range | -70 to -15 °CtdA (-112 to -5 °FtdA)
(at 30 bar rel./ 435 psi) -54 to +10 °CtdA (-94 to +50 °FtdA) (at 3 bar rel./43.5 psi) -45 to +30° CtdA (-76 to +86 °FtdA) (at 0 bar rel./0 psi) |
|
| Temperature | ||
| Measuring range | 0 to 50 °C (32 to +122 °F) | |
| Measurement uncertainty | ±0.5K (0 to 50 °C/32 to 122 °F) | |
| Sensor | NTC | |
Inputs and outputs |
||
| Analog outputs | ||
| Current/accuracy | 4 to 20 mA (2-wire) / ±40 μA | |
| Measurement rate | 2 s | |
| Resolution | 12 bit | |
| Load | 10 V DC: max. 100 Ω, 30 V DC: 950 Ω | |
| Scaling | Freely scalable via display buttons | |
| Switch outputs (opt. alarm plug, 0554 3302) | ||
| Contacts | 2 closer contacts, pot.-free, max. 30V/0.05A | |
| Switch thresholds | Standard 6 °Ctd/12 °Ctd, freely progr. with display | |
| Supply | ||
| Voltage supply | 24 V AC/V DC (10 to 30 V DC permitted); with alarm plug (0554 3302) 20 to 28 V DC | |
| Current consumption | 21 mA (without alarm plug) 65 mA (with alarm plug) |
|
General technical data |
||
| Design | ||
| Material/colour | Plastic, polyacrylamide | |
| Dimensions | 199.5 x 37 x 37 mm
(with standard plug) 203.5 x 37 x 37 mm (with plug 0554 3302) |
|
| Weight | Approx. 300 g | |
| Display | ||
| Display | High intensity 7-segement display | |
| Resolution | °C: 0.1 RH: 0.1 °Ctd: 0.1 °Ftd: 0.1 °CtA: 0.1 °FtA: 0.1 |
ppmv: 1 / 10 /
100
(dep. on meas. value) mg/m3: 1 / 10 / 100 (dep. on meas. value) °F: 0.1 |
| Rotatability (display positioning) | 350° around housing axis | |
| Installation | ||
| Thread / process connection | G1/2 thread (order code 01) or NPT1/2" thread (order code A 02) | |
| Miscellaneous | ||
| Protection class | IP65 (with plug attached and wire connected) | |
| EMC | According to guideline 89/336 EEC | |
| Operating conditions | ||
| Operating temperature (housing) | -20 to +70 °C (+4 to +158 °F) | |
| Storage temperature | -40 to +80 °C (-40 to +176 °F) | |
| Process pressure | max. 50 bar (725 psi) | |
