How to Calibrate the NS-I Pressure Transmitter？Accuracy Improvement Tips for Diffused Silicon Sensors

As a core device in industrial measurement，the accuracy of the NS-I pressure transmitter is directly related to production safety and efficiency。Diffused silicon liquid and gas pressure sensors are widely used in various industrial scenarios due to their high sensitivity and stability。However，improper calibration and maintenance can lead to increased measurement errors，and even shorten the service life of the sensor。This article will systematically introduce the calibration process of the NS-I pressure transmitter，covering wiring specifications for common models such as SMP131-TLD-L105GS-D1-F-53-4G15，measurement range setting tips for BAR-GV1，and how to extend the service life of 30.600G-2503 series sensors through correct operation。

1。Preparation Before Calibrating the NS-I Pressure Transmitter

Preparation before calibration directly affects the accuracy of calibration results。First，it is necessary to confirm that the calibration environment meets the requirements，the temperature should be maintained at 20±5℃，the relative humidity should not exceed 85%，and there should be no strong electromagnetic interference。For diffused silicon liquid and gas pressure sensors，special attention should also be paid to media compatibility to avoid using corrosive media during calibration。

The selection of calibration equipment is also critical。The standard pressure source should be at least one accuracy grade higher than the sensor being calibrated，and a pressure calibrator with an accuracy class of 0.05 or higher is recommended。The accuracy of the digital multimeter should not be lower than class 0.1，and it is used to measure the output signal。For pressure transmitters such as JC-023d，a 24VDC regulated power supply should also be prepared to ensure stable power supply。

Before calibration，the sensor should be visually inspected to confirm that there is no mechanical damage and that the seals are intact。For models such as A-A11507074 that need to be used with matching instruments，it is necessary to check in advance whether the instrument functions are normal。At the same time，prepare the product manual and understand the technical parameters of the specific model，such as the pressure range，output signal，and other key information of PA-21R-120bar-80853.3。

2。Wiring Specifications and Signal Detection for Diffused Silicon Pressure Transmitters

Correct wiring is the basis for ensuring the normal operation of pressure transmitters。Taking SMP131-TLD-L105GS-D1-F-53-4G15 as an example，its typical wiring method is a two-wire system：the red wire is connected to the positive terminal of the power supply，the black wire is connected to the positive terminal of the signal output，and the negative terminal of the power supply is shared with the negative terminal of the signal output。Shielded cables should be used for wiring，and the shield layer should be grounded at one end，which can effectively reduce electromagnetic interference。

For three-wire transmitters such as M5156-10286X-020BG，the positive terminal of the power supply，the positive terminal of the signal output，and the common negative terminal must be connected separately。It should be particularly noted that models such as 30.600G-2503-R-3-8-100-300-2-000 may adopt special wiring methods，so be sure to operate according to the product manual。After wiring is completed，a multimeter should be used to measure the loop resistance to confirm that there is no short circuit or open circuit。

Signal detection is an important part of calibration。After power-on，first measure the zero-point output。For transmitters with 4-20mA output，the zero point should be 4mA（±0.02mA）。Then gradually apply pressure and observe whether the change in the output signal is linear。If models such as M5256-000002-016BG show output signal fluctuations or excessive deviation，it may be caused by poor wiring or sensor failure，and the cause needs to be investigated。

3。Pressure Range Setting and Accuracy Calibration Methods

Pressure transmitters such as BAR-GV1 usually have an adjustable span range。During setting，first confirm that the maximum working pressure of the measured medium does not exceed 80% of the sensor span。For example，for a sensor with a measuring range of 0-1MPa，it is recommended that the working pressure should not exceed 0.8MPa。Overload operation will significantly shorten the service life of models such as 30.600G-2503-R-3-8-100-300-1-000。

Accuracy calibration generally adopts the five-point method：standard pressure is applied at 0%，25%，50%，75%，and 100% span points respectively，and the output values are recorded。For high-accuracy sensors such as JC-023d，it may be necessary to increase the calibration points to 7-11。If nonlinear errors are found，compensation can be performed by adjusting the internal potentiometer of the sensor。It should be noted that products such as Domestic Differential Pressure Transmitter SSM-P202C Diffused Silicon Integrated Differential Pressure Transmitter have external zero and full-scale adjustment functions，making operation more convenient。

Temperature compensation is the key to improving accuracy。The sensitivity of diffused silicon sensors changes with temperature，therefore high-end models such as PA-21R-120bar-80853.3 are equipped with built-in temperature compensation circuits。During calibration，testing should be carried out at different ambient temperatures to ensure that the accuracy meets the requirements over the full temperature range。If excessive temperature drift is found，recalibration or sensor replacement may be required。

4。Routine Maintenance and Service Life Extension Strategies

Correct routine maintenance can significantly extend the service life of pressure transmitters。For sensors such as A-A11507074 that are commonly used for corrosive media，it is recommended to check the condition of the isolation diaphragm every 3 months。If the output signal of models such as M5156-10286X-020BG is unstable，it may be caused by media crystallization，and the sensor should be cleaned in time。

Regular calibration is a necessary measure to ensure measurement accuracy。For general industrial applications，a comprehensive calibration is recommended every 12 months；for critical process points or high-accuracy sensors such as JC-023d，the calibration interval should be shortened to 6 months。Calibration records should be properly kept to facilitate tracking of sensor performance change trends。

The selection of supporting equipment also affects service life。Select suitable matching instruments for models such as M5256-000002-016BG to avoid signal distortion caused by impedance mismatch。During installation，attention should be paid to protection against mechanical stress。For the 30.600G-2503 series，excessive installation torque can damage the internal structure of the sensor。

5。Common Fault Diagnosis and Troubleshooting

Zero output signal is one of the common faults。For models such as SMP131-TLD-L105GS-D1-F-53-4G15，first check whether the power supply is normal，and then measure whether there is voltage at the sensor output terminal。If the power supply is normal but there is no output，the internal circuit of the sensor may be damaged。Models such as BAR-GV1 with short-circuit protection will automatically cut off the signal when the output is short-circuited，and can recover after the short circuit is eliminated。

Output signal fluctuations are usually caused by interference or mechanical vibration。Adding a signal filter to models such as PA-21R-120bar-80853.3 can effectively suppress high-frequency interference。If the fluctuations are accompanied by mechanical vibration，check whether the mounting bracket is secure。For precision sensors such as 30.600G-2503-R-3-8-100-300-2-000，even slight vibration may cause signal fluctuations。

Gradual accuracy degradation is a sign of sensor aging。Diffused silicon sensors such as A-A11507074 can have a normal service life of 5-8 years。If accuracy decreases significantly after 2-3 years of use，it may be caused by media corrosion or overload operation。At this point，sensor replacement should be considered instead of repeated calibration，because the stability of an aged sensor can no longer be guaranteed。

Summary

Correct calibration and maintenance of the NS-I pressure transmitter are key to ensuring accurate and reliable industrial measurement。Through standardized wiring，precise calibration，and scientific maintenance，the performance advantages of diffused silicon liquid and gas pressure sensors can be fully utilized，and the service life of the equipment can be significantly extended。Whether it is the wiring of SMP131-TLD-L105GS-D1-F-53-4G15 or the span setting of BAR-GV1，operations must be carried out strictly in accordance with the operating procedures。For differential pressure measurement applications with higher requirements，Domestic Differential Pressure Transmitter SSM-P202C Diffused Silicon Integrated Differential Pressure Transmitter provides a reliable solution。

If you need more professional advice on pressure transmitter calibration and maintenance，or technical support for specific models，please feel free to contact our technical team。We provide full-process services from product selection to on-site commissioning，ensuring that your measurement system always remains in optimal condition。