Transmitters

Industrial humidity measurement requires absolute professionalism in measuring and control technology. In industrial processes or in research-based business, the testo 6681 temperature and humidity transmitter is ideal wherever critical climatic values need to be maintained. The climate transmitter boasts a high-precision humidity sensor with long-term stability (optionally available), which enables it to achieve maximum precision: up to ±(1.0 + 0.007 * reading)

Precise measuring and control technology will help you to accurately optimize the climatic conditions in your rooms in order to prevent process disruptions and quality losses. Automation systems result in particularly efficient processes. The testo 6681 temperature and humidity transmitter can easily be integrated into individual automation systems because it features Ethernet, relay and analog outputs.

Areas of application for the testo 6681 temperature and humidity transmitter

1. Drying processes (e.g. drying tobacco, manufacturing ceramics, drying roofing tiles)
2. Painting installations
3. Food production (e.g. cheese processing, ripening fruit, drying pasta)
4. Bio-research
5. Breeding mushrooms
6. High-humidity specialist fields
7. Sterilization processes in an H2O2 environment
8. Clean rooms
9. Museums
10. Storing hygroscopic substances
11. Storing electronic components

Technical highlights of the testo 6681 climate transmitter

1. High-quality digital probes available for the temperature and humidity transmitter: e.g. high-precision Testo humidity sensor with long-term stability, probe for high-humidity measurement, probe for trace humidity measurement, probe with a self-monitoring function (for measuring in sensor-damaging media)
2. Smart probe technology: probe can be changed by the user, digital interface for the temperature and humidity transmitter, intelligent calibration concept
3. Ethernet, relay and analog outputs allow for versatile use of the temperature and humidity transmitter: e.g. for control purposes (2 or optionally 3 analog outputs), for direct activation of units in the air conditioning system (optionally via relay) or even in climate monitoring systems (optionally via Ethernet connection)
4. P2A software for parametrization, adjustment and analysis saves time and money during commissioning and maintenance
5. Optimum protection: the climate transmitter features a robust metal housing and is protected against water jets according to protection class IP 65. Protective caps are also optionally available for specific applications (made of stainless steel, PTFE, wire mesh filter or metal). A patented H2O2 protective cap is also available to order
6. 2-line display: the climate transmitter is optionally available with a display, enabling you to undertake commissioning, adjustment and analysis without using a PC
7. Options for self-monitoring and early warning function: guarantees high system availability

In combination with the right probe, the testo 6681 temperature and humidity transmitter offers superior properties and benefits in comparison with a conventional climate transmitter because, when it comes to temperature and humidity measurement, this instrument features supreme, cutting-edge technology.

Note: Please note that the transmitter can only be operated with a probe. The probes are optionally available

Adjustment on-site: Fast and precise via the external interface!
Of interest not only to in-house technicians or Facility Managers, but increasingly also to the responsible plant constructors: Which follow-on costs arise as a result of this transmitter?
Good news from Testo: The testo 650 or testo 400 reference instruments can be connected using the adapter 0554 6022 via the external interface – without opening the transmitter. A few operating steps in the testo 400 or testo 650 menu suffice to adjust the testo 6621 transmitter. Conclusion: Saved time and lower operating costs!

A broad variety of the testo 6621 transmitter is available. Depending on the application in a room or in a duct, the corresponding designs can be selected. A display and an external probe are available as options. You can choose between the housing colours grey and white. The testo 6621 is persuasive in technical terms thanks to the patented humidity sensors that guarantee the highest accuracy. The sensors and the analog outputs can be adjusted, analyzed and parameterized via the external interface using the P2A software.
The testo 6621 is a high-performance transmitter for a low price. It meets the increasing requirements in automated building services in terms of accuracy, reliability and safety and thereby saves energy costs.

- Highly accurate testo humidity sensor with long-term stability (±2.0% RH)
- Optional 2-line LCD display
- P2A software for parameterization, adjustment and analysis, saves time and costs in commissioning and maintenance
- Optimum calibration concept thanks to adjustment of the entire signal chain (1-point, 2-point and analog adjustment)
- Adjustment without dismantling the transmitter
- 2 analog outputs (humidity/temperature), option of 1 passive humidity and temperature analog output

Product Description

Not all measurement problems can be solved with "simple" transmitters. The testo 6651 meets special challenges. When combined with the probe series testo 660x, the testo 6651 becomes the first choice in demanding air conditioning technology as well as in many other applications. Optimum adjustment concept thanks to adjustment of the entire signal chain incl. analog adjustment Ethernet, relay and analog outputs allow optimum integration into individual automation systems Self-monitoring and early warning guarantee high system availability. Calculation and presentation of the humidity parameters relative humidity absolute humidity and dewpoint. P2A software for parameterization, adjustment and analysis saves time and costs in commissioning and maintenance
Display with multi-language display. High-quality plastic housing

With the testo 6321 you get a differential pressure transmitter with a good price-performance ratio for applications in air conditioning and ventilation technology. Automated building services need more and more accurate monitoring, which also means increasing requirements for measuring and control technology. The testo 6321 transmitter for differential pressure meets these requirements through high-precision measurement of differential pressure with long-term stability. It helps you to ensure optimum system function, to optimize climate conditions and to save energy.

testo 6321 differential pressure transmitter - the applications

1. Industrial and commercial buildings, e. g. in production and storage
2. Office and administration buildings
3. Sales areas and exhibition halls
4. Museums and libraries
5. School buildings, hotels, clinics, etc.

The differential pressure transmitter testo 6351 was developed specially for monitoring differential pressure in the measuring range from 50 Pa to 2000 hPa. In cleanroom technology, the maintenance of positive pressure prevents the entry of contaminated air. In addition to this, the flow velocity or the volume flow can be calculated from the measurement of the differential pressure in a Pitot tube.

The testo 6351 is particularly outstanding thanks to the automatic zero-point adjustment which ensures high accuracy and long-term stability. The integrated self-monitoring and early warning function also guarantees the operator high system availability. Measurement of differential pressure, flow velocity and volume flow. Automatic zero-point adjustment guarantees high, temperature-independent accuracy and long-term stability. Display with multi-language operating menu and optical alarm display Ethernet, relay and analog outputs allow optimum integration into individual automation systems. The P2A software for parameterization, adjustment and analysis saves time and costs in commissioning and maintenance.

Configurable alarm management with adjustable response delay and alarm acknowledgement

The differential pressure transmitter testo 6381 was developed specially for monitoring differential pressure in the measuring range from 10 Pa to 1000 hPa. In cleanroom technology, the maintenance of positive pressure prevents the entry of contaminated air. In addition to this, the flow velocity or the volume flow can be calculated from the measurement of the differential pressure in a Pitot tube. Thanks to an optional probe from the probe series 6610, the additional recording of humidity and temperature with one instrument is also possible. The testo 6381 is particularly outstanding thanks to the automatioc zero-point adjustment which ensures high accuracy and long-term stability. The integrated self-monitoring and early warning function also guarantees the operator high system availability.
Measurement of differential pressure, flow velocity, volume flow; optional: humidity and temperature
Automatic zero-point adjustment guarantees high, temperature-independent accuracy and long-term stability. Low measurement range up to 10 Pa ensures very high precision at lowest pressures
Ethernet, relay and analog outputs allow optimum integration into individual automation systems
The P2A software for parameterization, adjustment and analysis saves time and costs in commissioning and maintenance. Configurable alarm management with adjustable response delay and alarm acknowledgement

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

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

Testo 6441 compressed air flow meter enables you to carry out accurate compressed air consumption measurements, consumption and leak monitoring and flow measurements in your compressed air system. The compressed air flow meter can also be used to carry out a peak load analysis in order to determine whether you are generating compressed air of sufficient capacity. Overall, these measures can help you find potential for savings or prevent unnecessary investment costs.

Overview of the technical advantages offered by the testo 6441 compressed air flow meter

The testo 6441 compressed air flow meter is also a transmitter, which converts the measured parameter into a standardized electrical signal. The transmitter can therefore be integrated into systems (e.g. compressed air systems), making it a key instrument in measuring and control technology. The testo 6441 compressed air flow meter also offers the following advantages:

-  Ultimate flexibility with a variety of signal outputs: analog output, pulse output, 2 switching outputs. You will therefore be equipped for any kind of application, whether that is consumption measurement, consumption or leak monitoring or even flow measurement
-  Integrated totalling function: the practical totaliser means that no additional analysis units are needed to calculate the total consumption
-  Ultimate accuracy: the precisely defined inner diameter (DN15) enables adjustment to standard volumetric flow, providing a high degree of measuring accuracy. This is an advantage compared with standard penetration probes, which calculate volume flow on the basis of measured flow and indicated pipe diameter – a procedure that is more vulnerable to error than measurement using the compressed air flow meter
-  Easy operation with a high degree of flexibility: parametrization of signal outputs, switching of physical units, signal delay, signal attenuation are all possible
-  Measurement according to the calorimetric principle: no pressure loss during measurement
-  Other advantages: no temperature compensation required, quick response time, robust sensor, optimized accuracy thanks to integrated inflow and outflow sections

The testo 6631 transmitter was developed specially for monitoring critical ambient conditions in greenhouses, e.g. for bio research purposes. Precise and reliable humidity measurement is indispensible in these applications, in order to avoid costs caused by failed experiments.
Process security and system availability, among the most important factors in experimental plants, are supported by a number of properties of the testo 6631 bio research transmitter

The differential pressure transmitter testo 6383 was developed specially for monitoring low differential pressures in the measuring range from 10 Pa to 10 hPa. In cleanroom technology, the maintenance of positive pressure prevents the entry of contaminated air in critical zones. Thanks to an optional internal or external probe from the probe series 6610, the additional recording of humidity and temperature with one instrument is also possible.The testo 6383 is particularly outstanding thanks to the automatic zero-point adjustment which ensures high accuracy and long-term stability.

The integrated self-monitoring and early warning function also guarantees the operator high system availability. Measurement of differential pressure; optional: humidity and temperature.

Flat housing allows flush surface integration in the cleanroom wall.

Ethernet, relay and analog outputs allow optimum integration into individual automation systems.

Self-monitoring of the transmitter and early warning function guarantee high system availability.

The P2A software for parameterization, adjustment and analysis saves time and costs in commissioning and maintenance. Configurable alarm management with adjustable response delay and alarm acknowledgement