Testo 6740 : Dew point transmitter
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. 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.
- Measurement of dewpoints in the range from-45 °Ctd to +30 °Ctd
- Testo polymer humidity sensor with high accuracy and long-term stability
- 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)
Testo 6740 Dew point transmitter |
|
| 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) |
| 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 |
| Analog outputs | |
| Current/accuracy | 4 to 20 mA (2-wire) / ±40 μA |
| Measurement rate | 2 s |
| Resolution | 12 bit |
| load | 12 V DC: max. 100 Ω, 24 V DC: max. 650 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/0.5A |
| Switch thresholds | Standard 6 °Ctd/12 °Ctd, freely programmable with display |
| Supply | |
| Voltage supply | 24 V DC (12 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) |
- Overview
-
Testo 6740 : Dew point transmitter
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. 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.
- Measurement of dewpoints in the range from-45 °Ctd to +30 °Ctd
- Testo polymer humidity sensor with high accuracy and long-term stability
- 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)
- Technical specification
-
Testo 6740 Dew point transmitter
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)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 Analog outputs Current/accuracy 4 to 20 mA (2-wire) / ±40 μA Measurement rate 2 s Resolution 12 bit load 12 V DC: max. 100 Ω, 24 V DC: max. 650 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/0.5A Switch thresholds Standard 6 °Ctd/12 °Ctd, freely programmable with display Supply Voltage supply 24 V DC (12 to 30 V DC permitted);
with alarm plug (0554 3302) 20 to 28 V DCCurrent consumption 21 mA (without alarm plug)
65 mA (with alarm plug) - Download
