Importance of Calibration for Diffused Silicon Liquid and Gas Pressure Sensors

The YM-QP diffused silicon liquid and gas pressure sensor plays a critical role in industrial automation，petrochemical，electric power and energy，and other fields。As a precision measuring device，its measurement accuracy is directly related to production safety and product quality。During the use of pressure transmitters such as WS-WS101，QBE-QBE2002 and other models，factors such as changes in ambient temperature，medium corrosion，or component aging caused by long-term operation may all affect the measurement accuracy of the sensor。Therefore，regular calibration is a necessary measure to ensure stable performance of sensors such as the YM-GJ model with remote transmission signal and customized models such as KS-E-E-C-B04C-M-V。 The calibration process is essentially the correction of the corresponding relationship between the sensor output signal and the standard pressure value。Taking model 40.4366/000-999-405-502-20-61 as an example，an uncalibrated sensor may have zero drift or span error，which may cause process parameters to deviate from set values in minor cases，or even lead to safety accidents in serious cases。For models with alarm control functions such as QBE2003-P6，calibration is even a prerequisite for ensuring accurate alarm thresholds。This article will systematically introduce the calibration principles，equipment preparation，operating procedures，and common problem handling for the YM-JGSYY series diffused silicon pressure sensors，helping operators master professional maintenance skills for models such as KS-E-E-Z-B01U-M-V。

Preparation Work and Equipment Inspection Before Calibration

Before calibrating the YM-QP pressure transmitter，adequate preparation must be completed。First，confirm that the calibration environment meets the requirements：the ambient temperature should be maintained at 20±5℃，the relative humidity should not exceed 85%，and there should be no strong electromagnetic interference nearby。For explosion-proof models such as KS-E-E-C-B02C-M-V，it is also necessary to ensure that the working area is well ventilated to avoid the accumulation of flammable gases。 In terms of equipment preparation，the following standard instruments are required：a pressure standard instrument with an accuracy class not lower than 0.05（such as a piston pressure gauge），a 24VDC regulated power supply，a high-precision digital multimeter（resolution 0.001mV），and dedicated communication cables。Especially for the YM-GJ model with remote transmission signal，a signal simulator is also required to verify the linearity of the 4-20mA output。Operators should check whether the appearance of the QBE-QBE2002 pressure transmitter is intact，whether the interface threads are damaged，and confirm that the model，range，and other information on the product label are consistent with process requirements。 The selection of calibration medium is also crucial。For liquid pressure measurement，transformer oil or purified water is recommended as the pressure-transmitting medium；for gas pressure measurement，dry oil-free compressed air or nitrogen should be used。For special medium application scenarios such as 40.4366/000-999-405-502-20-61，the same medium as the actual operating conditions should be used for calibration to avoid measurement errors caused by differences in medium density。

Standard Calibration Procedure for YM-QP Pressure Sensors

The calibration of the YM-QP diffused silicon pressure sensor must be carried out strictly according to the following steps： 1. Zero calibration：Under no-pressure conditions，use dedicated software or a HART handheld communicator to read the original output value of the WS-WS101 transmitter。If zero offset is found，correct it by adjusting the Zero potentiometer or using the software zeroing function so that the output signal is stable at 4.000mA（corresponding to 0% range）。For the QBE-QBE2002 model with display，the LCD value can also be observed simultaneously to determine whether it returns to zero。 2. Full-scale calibration：Apply the 100% standard value of the sensor rated pressure（such as 1MPa），and after the pressure stabilizes，check whether the output current is 20.000mA。If there is a deviation，adjust it through the Span potentiometer or span calibration parameters。Customized models such as KS-E-E-C-B04C-M-V may have multi-segment linear correction functions，and multi-point calibration should be performed according to the manual。 3. Linearity verification：Apply and reduce pressure step by step at 25%，50%，and 75% range points，and record the output value at each point。The linearity error of the YM-GJ model with remote transmission signal should be controlled within ±0.1%FS，otherwise linear compensation must be performed again。During the test，special attention should be paid to the sealing performance of high-pressure models such as 40.4366/000-999-405-502-20-61 to prevent medium leakage。 4. Alarm function test（for models such as QBE2003-P6）：Set high and low alarm points respectively，and verify the accuracy and response time of relay actuation。The YM-JGSYY model with HART protocol can monitor the alarm status in real time through host computer software。

Calibration Precautions for Special Models

Different models of diffused silicon pressure sensors have special requirements during calibration： • Explosion-proof models（such as KS-E-E-Z-B01U-M-V）：The calibration process must be performed with power disconnected，and opening the electrical chamber in hazardous areas is prohibited。After calibration is completed，the fit clearance of the flameproof surface must be strictly checked（not exceeding 0.2mm）。 • Hygienic models（such as 40.4366/000-999-405-502-20-61）：Dedicated clamp connections must be used to connect calibration equipment，and SIP/CIP cleaning procedures must be performed before and after calibration to ensure there are no hygienic dead zones。 • High-temperature models（such as KS-E-E-C-B02C-M-V）：Before calibration，preheat to the operating temperature，and use the temperature compensation coefficient to correct the readings。During cooling，the temperature should decrease naturally to avoid rapid cooling that may cause deformation of the sensor diaphragm。 For gauge pressure models with on-site display such as QBE-QBE2002，it is also necessary to regularly check whether the display brightness is uniform and whether the button functions are normal。For the YM-GJ remote transmission model，test whether the signal transmission distance meets the requirements（usually ≤1000m），and add a signal amplifier if necessary。

Calibration Data Recording and Quality Traceability

Complete calibration records should include the following elements：sensor model（such as WS-WS101），serial number，calibration date，environmental conditions，standard instrument number，calibration personnel，and other information。For YM-QP industrial-grade sensors，it is recommended to record test data using the following table： For critical sensors used in safety interlock systems such as KS-E-E-C-B04C-M-V，calibration records must be kept for at least 3 years。The calibration report for the QBE2003-P6 alarm control model should also include relay actuation test results and be reviewed and archived by the quality department。

Analysis and Handling of Common Calibration Problems

During actual calibration，operators may encounter the following typical problems： 1. Unstable zero drift：Possible causes include diaphragm deformation caused by sensor overload，loose electrical connections，or sudden changes in ambient temperature。For the YM-JGSYY model，try activating the automatic temperature compensation function and then recalibrate。 2. Linearity out of tolerance：This is commonly seen in high-pressure models such as 40.4366/000-999-405-502-20-61，usually caused by mechanical stress on the sensor body or medium crystallization。It is recommended to relieve installation stress and retest，and perform three-point linear correction if necessary。 3. HART communication interruption：Check whether the wiring polarity of QBE-QBE2002 is correct and whether the terminal resistance matches（usually 250Ω）。For explosion-proof models such as KS-E-E-Z-B01U-M-V，confirm whether the intrinsically safe loop parameters meet the requirements。 4. Alarm function failure：First check the relay supply voltage of the YM-GJ model，and then verify whether the set value exceeds the range。For QBE2003-P6 with logic control function，also check whether the program parameters have been mistakenly modified。

Determination of Calibration Interval and Maintenance Recommendations

The calibration interval of diffused silicon pressure sensors should be dynamically adjusted according to operating conditions： • Conventional operating conditions：Standard models such as WS-WS101 are recommended to be calibrated every 12 months • Harsh environments（high temperature/corrosion/vibration）：For models such as KS-E-E-C-B02C-M-V，shorten the interval to 3-6 months • Safety instrumented systems（SIL certification）：YM-QP safety models must be implemented according to SIL level requirements During routine maintenance，attention should be paid to：regularly checking whether the impulse pipe of the YM-JGSYY sensor is blocked，whether the meter head of QBE-QBE2002 is damp，and whether the seals of 40.4366/000-999-405-502-20-61 are aged。For sensors such as KS-E-E-C-B04C-M-V that are out of service for a long time，a powered-on inspection should be performed once every quarter。

Summary and Technical Support

Correct calibration operations can maximize the performance advantages of the YM-QP diffused silicon pressure sensor。Whether it is the WS-WS101 basic model or the QBE2003-P6 multifunctional model，regular calibration is a necessary means to ensure measurement reliability。For calibration requirements of special models such as KS-E-E-Z-B01U-M-V，it is recommended to contact the manufacturer to obtain model-specific technical manuals。 If you need to learn more about the YM-GJ model with remote transmission signal or the 40.4366/000-999-405-502-20-61 customized application solution，please call our technical hotline or visit our official website to download the latest version of the calibration procedure。Our professional engineering team can provide on-site calibration services for products such as KS-E-E-C-B04C-M-V，ensuring that your measurement system always remains in optimal operating condition。