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Calibration manual

W0710
W0711
W0741
W3710
W3711
W3721
W3745
W4710
W5714
W7710

Manual for Calibration and Adjustment
for WiFi sensors

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Содержание W0710

Страница 1: ...www cometsystem com Calibration manual W0710 W0711 W0741 W3710 W3711 W3721 W3745 W4710 W5714 W7710 Manual for Calibration and Adjustment for WiFi sensors ...

Страница 2: ...ges in this manual without explicit agreement of company COMET SYSTEM s r o All rights reserved COMET SYSTEM s r o makes constant development and improvement of their products Manufacturer reserves the right to make technical changes to the device without previous notice Misprints reserved ...

Страница 3: ...CY VERIFICATION 5 Calibration recommendations 5 General calibration conditions 5 Preparing the WiFi sensor for calibration 7 Calibration procedure 7 ADJUSTMENT 8 WiFi sensor Adjustment Conditions 8 Adjustment Procedure 9 Saving of the new Adjustment 11 REVISION HISTORY 18 ...

Страница 4: ...e device Standard Measurement equipment e g thermometer or reference scale of certain quantity e g calibration gas used for calibration or adjustment Value Numerically quantified representation of measured physical quantity Sensing element Place of device or standard which is responsible to conversion of physical quantity to measured value Probe Sensing element at the cable or at detachable connec...

Страница 5: ...is necessary to calculate the so called extended measurement uncertainty which includes the properties of the whole measuring chain accuracy of standards inhomogeneity of the field in the calibration chamber resolution of instruments etc This uncertainty must be better than the required DUT accuracy in order to evaluate the measurement accuracy of the DUT The determination of uncertainties is perf...

Страница 6: ...ed the measuring range of the WiFi sensor The time for starting and stabilizing the calibration chamber must be known in advance or can be reliably ascertained during calibration This can be done by monitoring the values of the standard Stability of the calibration chamber means the condition when the calibrated quantity does not change anymore and the air circulating in the chamber has the same t...

Страница 7: ... counted from the moment when the controlled quantity has stabilized in the calibration chamber This time should be at least three times the response time t90 specified in the User manual for the calibrated quantity After this time read the measured value of the standard and the value from the calibrated DUT Set the chamber to generate another value for next point and repeat the above procedure fo...

Страница 8: ...ans of the WifiSensorUtility software WiFi sensor Adjustment Conditions Any unqualified entry into the instrument adjustment mode to may rewrite the existing calibration constants It can cause that the instrument will be unable to measure Follow recommendation and conditions for calibration during the device adjustment Adjustment of the measured values should be done in two point These points shou...

Страница 9: ...nded to back up the current sensor settings to file for possible restoring Save the backup file Backup file allows you to return the settings to the previous state including calibration Restoring can be done using Service Restore configuration from file menu item Note Calibration of Digi probes cannot be restored in this way see below Be aware that administrator password for device is required in ...

Страница 10: ...ity pressure and CO2 is also placed in the calibration chamber During adjustment proceed in the same way as described above for calibration Close and run the calibration chamber Set to calibration chamber to a first adjustment point value Wait for the device to stabilisation The device stabilization time can be counted from the moment when the controlled quantity has stabilized in the calibration ...

Страница 11: ...0 RTD sensors are very stable From this reason is not recommended to change calibration constants if the probe does not measure accurately There are two ways to improve measurement accuracy It can be set correction to cable length or user calibration can be used At first step enter Device settings and show Channels bookmark In case of probes with longer cables are used it should be set correction ...

Страница 12: ...12 IE WFS KAL WiFi 01 If correction to cable length is correct it can be set user calibration If the WiFi sensor measured 25 C before this setting then 26 C will measure after it ...

Страница 13: ... downloaded from device Digi probes can be restored into factory defaults only select Service Digi probe adjustment menu item select Input and click Read from probe button Temperature adjustment Is usually not necessary to adjust the temperature of Digi probe For adjustment enter the measured values of the standard and the device Click Save new calibration button finally If the device measured 25 ...

Страница 14: ...e new calibration button finally If the device measured 73 2 RH before adjustment then measures 75 3 RH after it Important note Capacitive humidity sensors usually drifts at high humidity and not at low humidity values In most cases it is sufficient to perform a one point adjustment in higher humidity as show at image ...

Страница 15: ...ct Service Device adjustment menu item two point calibration select Barometric Pressure channel 1 Click Enter Adjustment 2 Enter standard value for calibration point No 1 3 Enter device value for calibration point No 1 4 Enter standard value for calibration point No 2 5 ...

Страница 16: ...lue for calibration point No 2 6 Save new calibration to device 7 CO2 concentration Adjustment W4710 W5714 select Service Device adjustment menu item one point offset can be used select CO2 concentration channel 1 Click Enter Adjustment 2 ...

Страница 17: ...IE WFS KAL WiFi 01 17 Enter a zero value 3 Enter a zero value 4 Enter standard value for calibration point 5 Enter device value for calibration point 6 Save new calibration to device 7 ...

Страница 18: ...18 IE WFS KAL WiFi 01 Revision history Document version Date Note IE WFS KAL WiFi 01 January 2021 Initial document version Note Page numbers may to differ between document versions ...

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