Delivery Scope

Testo 6743 dew point transmitter to -45 °Ctd with polymer humidity sensor, display, process connection G½ thread, analog output 4 to 20 mA and optional alarm plug with 2 switching outputs

Dew Point Transmitter (to -60 °Ctd) - testo 6743
Model No: testo 6743 Part No: 0555 6743

Testo 6743 dewpoint transmitter to -60 °Ctd, with display, process connection G1/2, analog output 4 to 20 mA, optional alarm plug with 2 switching outputs

  1. Dew point transmitter with a measuring range of -45 °Ctd to + 30 °Ctd, G½ thread and display
  2. Testo polymer humidity sensor with a high degree of accuracy and long-term stability
  3. Freely scalable analog output (4 to 20 mA) and optional alarm plug with 2 integrated switching outputs


Air, compressed air and gases are used in all areas of industry. Humidity and moisture are generally undesirable because they can cause damage or impair the quality of the end product. The use of measuring and control technology is recommended in order to monitor humidity in the network and prevent damage.

Our testo 6743 dew point transmitter was designed specifically for measuring trace humidity in compressed air or dry air. It boasts a polymer humidity sensor which features a high degree of accuracy and long-term stability.

Technical advantages offered by the testo 6743 dew point transmitter

  1. High accuracy: the testo 6743 dew point transmitter uses the Testo polymer sensor to measure humidity with a high degree of precision – up to ±1 K at 0 °Ctd (+32 °Ftd)
  2. Scalable analog output: the dew point transmitter converts the measured values into a standardized electrical signal, whereby the analog output can be scaled as required (4 to 20 mA)
  3. Alarm plug with 2 integrated switching outputs (optional): use the switching contact plug for MAX monitoring
  4. Practical format: the testo 6743 dew point transmitter features a compact and user-friendly design. For example, the housing can be rotated by 350°, enabling optimum alignment of the display
  5. Display with operating menu: convenient operation and on-site read-out of readings

Use the dew point transmitter to prevent damage (e.g. in refrigeration dryers or membrane dryers). This can save you a considerable amount of money, because if the quality of the end product is impaired in any way, it can prove costly. The cost of running adsorption dryers can also be reduced: accurate humidity-controlled chamber activation precisely adjusts the use of regenerated air to meet requirements – not at a preset time increment, which often creates unnecessary, excess consumption of regenerated air

Dewpoint/trace humidity
Units %RH, °C
Calculated parameters °Ctd, °Ftd, °CtA, °FtA, ppmv, mg/m3, °F
Measuring range -60 °Ctd to +30 °Ctd, -80 °CtdA to +15 °CtdA
Measurement uncertainty ± 2 °Ctd
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)
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 W, 24 V DC: max. 650 W, 30 V DC: 950 W
Scaling Freely scalable via display buttons
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)
General technical data
Material/colour Plastic, polyacrylamide
Display High intensity 7-segement display
Rotatability (display positioning) 350° around housing axis
Thread / process connection G½ thread or NPT½“ thread
Protection class IP65 (with plug attached and wire connected)
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)

Delivery Scope

Testo 6743 dew point transmitter with measuring chamber, Rotameter, SMPS, mains cable 2 mtrs., teflon tube with 1/4" male coupler

Portable Battery operated Dewpoint meter - Portable Dew Point Transmitter Kit
Model No: Portable Dew Point Transmitter Kit Part No: 540002 0343

Testo Portable Dewpoint Meter is specially developed for trace humidity measurement in compressed or dry air. This handy portable dewpoint meter is ideal for onsite spontaneous measurement. Thanks to a special adjustment, optimum accuracy in the trace humidity range is obtained. Quick release connections are provided for easy and fast operation. Its rechargeable battery has long life per charge aiding trouble free operation

  1. Measurement of dew points in the range from -60 °C °C td to +30 °C td
  2. Testo polymer humidity sensor with high accuracy and long term stability
  3. Convenient operation via the display menu
  4. Easy to carry with quick release connection
  5. Long lasting battery life per charge


Air, compressed air and gases are used in all areas of industry. Humidity and moisture are generally undesirable because they can cause damage or impair the quality of the end product. The use of measuring and control technology is recommended in order to monitor humidity in the network and prevent damage.

Our testo 6743 dew point transmitter was designed specifically for measuring trace humidity in compressed air or dry air. It boasts a polymer humidity sensor which features a high degree of accuracy and long-term stability.

Technical advantages offered by the testo 6743 dew point transmitter

  1. High accuracy: the testo 6743 dew point transmitter uses the Testo polymer sensor to measure humidity with a high degree of precision – up to ±1 K at 0 °Ctd (+32 °Ftd)
  2. Scalable analog output: the dew point transmitter converts the measured values into a standardized electrical signal, whereby the analog output can be scaled as required (4 to 20 mA)
  3. Alarm plug with 2 integrated switching outputs (optional): use the switching contact plug for MAX monitoring
  4. Practical format: the testo 6743 dew point transmitter features a compact and user-friendly design. For example, the housing can be rotated by 350°, enabling optimum alignment of the display
  5. Display with operating menu: convenient operation and on-site read-out of readings

Use the dew point transmitter to prevent damage (e.g. in refrigeration dryers or membrane dryers). This can save you a considerable amount of money, because if the quality of the end product is impaired in any way, it can prove costly. The cost of running adsorption dryers can also be reduced: accurate humidity-controlled chamber activation precisely adjusts the use of regenerated air to meet requirements – not at a preset time increment, which often creates unnecessary, excess consumption of regenerated air

Dewpoint/trace humidity
Units %RH, °C
Calculated parameters °Ctd, °Ftd, °CtA, °FtA, ppmv, mg/m3, °F
Measuring range -60 °Ctd to +30 °Ctd, -80 °CtdA to +15 °CtdA
Measurement uncertainty ± 2 °Ctd
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)
Supply
Battery Power Rating Rechargeable 12V 4.2Ah
Battery Life 48 hours per charge
General technical data
Material/colour Plastic, polyacrylamide
Display High intensity 7-segement display
Process connection ¼” male quick release connection Supplied with 2 mtr. teflon tube
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