 KAYTECK INSTRUMENTS |
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Special Functions
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| How to turn a
multifunction instrument into a special version: The automatic sensor recognition makes it possible to activate additional measurement functions and sensor parameters. In this way the standard instrument ALMEMOŽ 2290-2 and ALMEMOŽ 2290-3 turn into special instruments for individual applications without any additional settings - just by connecting a new sensor. Depending on the type of instrument these additional measurment functions and
sensor parameters are activated in different ways: The following list will explain the most important special functions with a recommendation for the suitable instrument: |
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| Humidity
and moisture: The connectors of relative humidity sensors offer 4 channels and can be programmed to measure temperature, relative humidity, dew point, mixture ratio, partial vapour pressure or enthalpy. The first 4 parameters are the standard programming. For all channels the standard functions such as Min, Max and limiting values are still available. The psychrometric sensors additionally offer the ability to compensate for the atmospheric pressure (e.g. at different altitudes). A special sensor for
moisture measurement can be adjusted to the different materials such as building material,
wood and paper. |
Functions humidity and moisture • temperature • relative humidity • dew point • mixture ratio • enthalpy • vapour pressure • humid temperature • air pressure compensation • base value |
| Infrared: For correct measuring results with infrared sensors it is necessary to consider the emissivity factor and sometimes even the background temperature. The connectors of infrared sensors activate the required function and store the correction factors Recommended instruments: ALMEMOŽ 2290-2, |
Functions infrared • emissivity factor • ambient temperature |
| Air flow: The connectors of vane anemometer sensors and differential pressure sensors (for Pitot tubes) activate the function keys F1 and F2 (of ALMEMOŽ 2290-2 and ALMEMOŽ 2290-3) for automatic averaging as well as for the programming of diameter or surface of ducts to measure the volume of air in m3/h. The averaging can be via single measurements as well as via a continous measurement. The sensitivity of the differential pressure sensor can be set to zero by push buttons. As the calculation of the air velocity measured by Pitot tubes depends on ambient temperature, an automatic temperature compensation is possible (only with module FD-A622-M1 and FD-A622-M6). The ALMEMOŽ 2295-6 additionally offers a selectable time constant. In case of rapidly changing measured values, the display is smoothed, so that it can be read-off more easily. The programming of the diameter of ducts is more individual and also possible as length and width. Recommended instruments: ALMEMOŽ
2290-2 |
Functions air flow • average value • average mode • count • time constant • cross section • diameter • length • width • temperature compensation |
| Conductivity: The connectors of the conductivity sensors activate the automatic temperature compensation. The temperature of the medium is measured by the sensor and then related to 25°C for calculation. Recommended instruments: ALMEMOŽ 2290-2 |
Functions conductivity • temperature compensation |
| Force: The connectors of force sensors activate the zero point alignment for basic force (tare). The final value can be programmed as a set-value. From this the correction factor will be automatically calculated. Sensors including a resistance as reference can be adapted to a special ALMEMOŽ connector which activates this built-in resistance for the alignment. Recommended
instruments: all ALMEMOŽ 2290-2, |
Functions force • base value • factor • set value entry • final value check |
| pH
measurement: pH sensors are not continously stable. For calibration the sensor must be placed into a standard reference solution. The calibration of zero point and gain is possible via push buttons which are activated by the ALMEMOŽ connector. The alignment is stored inside the connector and so the sensor can be adapted also to other ALMEMOŽ instruments. It is even possible to connect several sensors with different alignment to one ALMEMOŽ instrument at the same time. If a pH temperature sensor is adapted, the connector activates an automatic or individual temperature compensation. Recommended
instruments: ALMEMOŽ 2290-2 |
Functions pH measurement • alignment (pH7, pH4, pH10) • temperature compensation |
| Heat flow: The calibration factor of each heat flow plate is stored as a factor into its ALMEMOŽ connector. Therefore, a heat flow measurement without calibration factor adjustment is possible. Via the activated function channels other measurements such as averaging of the heat flow, differential temperature with averaging value and K-value measurement, calculated by the quotient of both averaging values, are possible. Depending on the arrangement of the temperature sensors the heat transfer coefficient a the thermal resistance L or the thermal transition coefficient k (k-value) can be calculated by the ALMEMOŽ instrument. Recommended instruments: all ALMEMOŽ 2290-2 |
Functions heat flow • calibration value • difference • average value • thermal coefficient |
| Wet-bulb-globe-temperature (WBGT): The measurement of the WBGT is for to find out the heat stress on working places. The WBGT will be calculated from the dry temperature, DT, the natural humidity temperature, HT, and the globe temperature, GT, after connecting a psychrometer and a globe temperature sensor: WBGT = 0.1 DT + 0.7 HT + 0.2 GT For the evaluation of this formula, the virtual channel WGBT is activated. Recommended instruments: ALMEMOŽ
2290-3 |
Functions WBGT • humidity temperature • WBG-temperature |
| Pulse: Pulse sensors (e.g. counters for power or water quantity) measure the number of pulses per measuring cycle by means of a frequency module. These pulses can be counted additionally via the output cycle or via any time. Recommended instruments: ALMEMOŽ 2290-8 |
Functions pulse • pulse cycles • counts/printing cycle • count/time |
| Digital signals: With the digital input cable ZA-9000-EK two signals can be measured and controlled via each input channel. After programming of a limiting value, off-normal values can be printed out. Recommended instruments: all ALMEMOŽ 2290-2 |
Functions digital signals • digital input |
| Output contacts: For the transfer of alarm states or for driving peripheral instrumentation an output cable with 2 relays is available (ZA-1000-EAK). The cable must be connected to the ouput OUT2 and will be activated via the serial interface. Recommended instruments: all from ALMEMOŽ 2290-2 |
Functions output contacts • digital output |
| Virtual channels: Min, Max, average or difference values are stored or output via virtual channels. All measuring and programming functions can be applied to measuring channels, but are also possible with the virtual channels. Normally, the measured value will be updated only when a measuring point scan is done. The calculated value (or value of virtual channel) is programmed as the second channel of a sensor (referring to measuring channel number one). Recommended
instruments: ALMEMOŽ 2290-3 |
Functions virtual channels • difference • average value • maximum value • minimum value |
| AC-measurement: For AC-voltages up to 26 V (20Hz to 2 kHz) an ALMEMOŽ adapter cable with a built-in True-RMS converter is available. The converter is supplied galvanically separated via a DC/DC-converter. |
Functions AC-measurement • real effective value |
| Other sensor configurations: Distance: For precision distance measurements distance transducers and distance tracers are available. Chemistry: For measurement of O2/CO/CO2 -concentration in gases, O2 in liquids chemical and electronic measuring cells with different measuring ranges are available. Optics: Sensors for illumination, UV-radiation and radiometric measurements e.g. Laser performance or quantum sensors for photosynthesis of plants are available for ALMEMOŽ instruments. Meteorology: The ALMEMOŽ system offers sensors for wind velocity, wind direction, rainfall, global radiation, temperature and humidity. |
Functions sensor-configurations • distance • oxygen • carbon monoxide • carbon dioxide • illumination • radiation • wind direction • rainfall |
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