Unfavourable environmental conditions such as high static pressure temperatures, very dirty air or aggressive gases hardly effect the Pitot tube. Furthermore, as the Pitot tube has no moveable parts, it does not suffer any wear and total pressure tear. The purely static pressure is absorbed by the slit on the side and is directed to the pressure probe connection a b.
The resulting differential pressure is the flow independant dynamic pressure. This is analyzed and displayed. Should the pressure values be converted into flow values, the basic parameter, air density, must be corrected at the beginning of the measurement. See chapter on measuring air density.
Description of probes testo Pressure probes. The pressure probe works with a differential pressure sensor according to the wire strain gauge principal. In the measuring range 0 to hPa, reliable differential pressure measurements can be made through out the range.
The sensor has an overload protection in a range of up to hPa , damage can be expected if the sensor is used in higher pressures. Equally, measurements should be avoided in rapid pulses of pressure e. For reproducable measurements, the pressure probe testoterm. The pressure probe must be used in the same plane as it was calibrated or else an additional error will result. We therefore recommend the magnetic holding set for pressure probes.
The influence of air pressure, temperature and humidity is unfortunately all too often underestimated. With the aid of the following table, determine the mean annual air pressure for the height at the place of measurement and calculate the additional fluctuations with a barometer or ask for the exact air pressure value from your weather office.
Table 2: Barometric formula for altitude Dependence of the air pressure on the local height Height Air press. Height Air press. The critical area in low pressure conditions. Example: You are m above sea level. Here there is a mean annual pressure of hPa. According to the barometer hPa and height correction of the barometer to hPa , the mean annual air pressure must be reduced by Add the difference between the ambient air pressure and the static process air pressure to this air pressure e. Example: We have determined a mean annual pressure of hPa.
Due to the static process pressure, 90 hPa should be added. We, thus, have an absolute air pressure in an area of measurement of hPa. The air density is dependent on temperature i. With the aid of table 3 you can determine air density as a function of pressure and temperature.
Critical range: high humidity values at high temperature. Take the corresponding correction factor from table 4 and subtract it from your pressure value. Display variations Individual probes testo The following are connected: The measured values appear in the top line of the display. The following is connected: The measured values are shown in 2 different displays:. Repeat temperature value and dew point temperature or. Display variations testo Individual sensors.
The following are connected: The measured values appear in the display. The following is connected: The measured values are shown 2 different displays:. Humidity value Dew point temperature 41 or. Display variations Connection variations testo The following are connected: The measured values are shown in 2 displays:. Temperature value from probe b and dew point or.
The following are connected: The measured values are shown in 2 different displays:. The determination of dew point temp. Display variations testo Connection combinations. The following are connected: The measured values are shown on 2 displays:. The determination of the Humidity and dew point temperature or temperature values from absolute humidity is not probe a applicable with this combination. The following are connected: The measured values are shown in 2 displays: hPa.
Display variations Connection combinations testo The following can be connected: The measured values are shown in 2 different displays:. The measurement of dew point temperature or absolute humidity value b humidity is not applicable with pressure value a this combination.
Analogue outputs testo testo has two parallel analogue outputs. Depen- ding on the probes plugged-in, different signals are given out at the analogue outputs. The value of the top display line is always the output from the top analogue output. In order to connect the analogue output, please use the connecting lead Observe correct polarization when connecting the analogue outputs!
Logger connection for storing and printing measured values testo testo has an interface for plugging in a logger for storing and printing meas. Short instructions for The logger is simply plugged into the measuring Print. STO T control of air conditioning processes. The connection is P.
The connection between the measuring instrument and logger is not protected against static discharge. When using meas. When using the mains unit remove the batteries from all connected instruments. Floating battery operation is possible with rech. As electricity is required for data buffering and rech. If the battery voltage of the logger is less than 4.
In order to prevent data going missing, we recommend the use of a mains unit together with rech. Logger connection testo Connect the logger.
Print meas. Store meas. Store and print Read out meas. Read out meas. The cycle time is freely selectable in the range between 1 sec. The logger allocates a serial measured value number to each storage. During evaluation of the measured values, the distance between the measured value numbers to be stored can be determined e.
Moreover, the stored value to be read out first can be determined Start no. The memory switch has to be on "out" and the printing mechanism must be switched off.
The individual numbers can be called by the turn- over key and changed by the arrow key. Confirm the adjustment by pressing the turn-over key. Logger connection testo Changing the paper Open the paper housing on the top of the logger. Snip off the remaining paper from the roll and remove it using the paper feed!
Cut new paper roll on the bias and insert the paper roll thermo-printing paper! There is protective cover on top of the printing mecha- nism, which can be removed. Open this cover occasio- nally in order to remove paper remainders.
Clear the memory On the lefthand side of the housing, there is a small slot. Behind this slot a small button is located, which can be operated with a pointed object. As an acknowledgement that the memory is clear, a sign is indicated in the display. Date and time are maintained. A detailed instruction manual is supplied with the PC Adapter, thus only short instructions are given in the following.
The connection is mechanically locked. Press the key on the right-hand side of the PC Adapter or logger to detach. Depending on the mode of operation, the switch on the PC Adapter has to be put into the corresponding position:. PC Adapter and logger Measured values from the logger - when not connected to the measuring instrument - can only be read out when the logger is supplied by the mains unit part no. PC Adapter and meas.
PC Adapter, meas. If you have a monochromic or a LCD screen e. Lap- tops call the programme as follows:. Proceed according to the information given by the dialogue instructions bottom corner of screen. A software PC Adapter - version 1. Ordering data Measuring instrument,velocity probes testo Description Part no. Software, XT connector, manual Description velocity probes Meas.
Vanes max. Connecting lead for vane probe connectable , 1. Ordering data testo Description velocity probes Meas. Thermal probes max. Description pressure probe Meas. Description humidity probe, Meas. Temperature probe for. Surface meas. Accessories Part no. Silicone heat paste 14 g for surface measurements Warranty: Meas. Open navigation menu. Close suggestions Search Search. User Settings. Skip carousel. Carousel Previous. Carousel Next. What is Scribd? Explore Ebooks.
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Observe measuring ranges! Overheating will destroy the sensors. During this 1 Ready for another timed mean value measurement time the instrument stores the actual START STOP measured values Bypass the timed mean value measurement and go directly to 2 the multi-point mean Mean value measurement.
In such cases thermal velocity sensors will display higher measured values than vane probes This should be observed when measuring in ducts. This tolerance can not be eliminated, but can, however, be reproduced.
For reproducable measurements, the pressure probe testoterm signal should be set to 0. With the aid of the following table, determine the mean annual air pressure for the height at the place of measurement and calculate the additional fluctuations with a barometer or ask for the exact air pressure value from your weather office Table 2: Barometric formula for altitude Dependence of the air pressure on the local height Height Air press.
The connection is P mechanically locked. Press the key on the logger to detach. When the batteries are changed, the memory is cleared! Depending on the mode of operation, the switch on the PC Adapter has to be put into the corresponding position: PC Adapter and logger Measured values from the logger - when not connected to the measuring instrument - can only be read out when the logger is supplied by the mains unit part no.
Temperature probe for Surface meas. Aldrin Hernandez. Bhavin Doshi. Christian Bedoya. Shadi Abdelsalam. Evalcon SAS. Nurhidayah Ayu. Retro Seasons. DJ Cherry. Alberto Castrejon. Hugo Aguiar. JovMac Manzano. Alhgasjsghjagjsdajlsd Asdalsdlkaksd. Saheer Ambadan. Edinson Vallejo Vidal. Abigail De Los Santos. Alexander Martinez.
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