Diffused Silicon Gas Pressure Sensor Operation Guide

As a key component in the field of industrial automation，the PQ50-GB10CG12M4B diffused silicon gas pressure sensor is widely used in petrochemical，electric power and energy industries thanks to its high accuracy and stability。This article systematically analyzes the core operating points of this model and similar products（such as KYB18G07M1P4C3-I，ZWP-L61-K，etc.），helping operators avoid common usage mistakes。

I、Product Structure and Technical Features

The core of a diffused silicon pressure sensor lies in the piezoresistive effect of the monocrystalline silicon chip，PQ50-GB10CG12M4B uses a military-grade ceramic substrate，with a measuring range covering -0.1~60MPa and accuracy up to ±0.1%FS。Compared with models such as EDYBT-4，its specially designed 316L stainless steel diaphragm can withstand 200% overload pressure，extending service life by 30% in corrosive gas environments。When used with the MSZ-MSZ11 intelligent display instrument，the system error can be controlled within ±0.25%。

II、Installation and Wiring Specifications

When referring to the KYB18G07M1P4C3-I wiring diagram，please note：the red wire connects to the positive terminal of the 24VDC power supply，the black wire connects to the positive signal output，and the shielding layer must be grounded at one end。During installation，avoid direct mechanical stress acting on the sensor body，and it is recommended to use the TY-TY211 dedicated bracket for fixing。For explosion-proof models such as HB-31C，wiring in hazardous areas must strictly comply with the IEC60079-14 standard。

1. Connect the cable after cutting off the power supply
2. Check the range setting of the MS-MS501 matching instrument
3. Perform zero drift calibration（see Chapter IV for the method）

III、Calibration and Maintenance Points

Calibration of the HQ-HQ1002 pressure transmitter requires the use of a 0.05-grade standard pressure source and should be performed according to the JJG882-2019 regulation。Common troubleshooting：if ZWP-L61-K shows output fluctuation，the pressure guide tube may be blocked；when the service life of EDYBT-4 is abnormally shortened，check whether the medium complies with the EN837-1 standard。It is recommended to perform the following maintenance every 6 months：

• Clean the isolation diaphragm of the pressure connection
• Check the aging condition of cable seals
• Use FLUKE754 to record calibration data

IV、Analysis of Typical Application Scenarios

In natural gas pressure regulating stations，when MSZ11 is used together with PQ50，please note：when the ambient temperature is below -10℃，a heated transmitter should be selected；KYB series products are recommended for compressed air systems，because their response time is ≤1ms。The pharmaceutical industry should give priority to the FDA-certified HB-31C model，whose hygienic design can withstand SIP cleaning。

V、Solutions to Frequently Asked Questions

Q：How to determine whether the sensor needs to be replaced？
A：When the PQ50 matched with TY211 has the following conditions，it should be replaced：zero drift ＞0.5%FS/year，insulation resistance ＜20MΩ（500VDC test）。Q：How to handle abnormal display of the MS501 instrument？
A：First check the 4-20mA loop impedance（should be ≤600Ω），then confirm whether the sensor power supply is stable。

Why Choose Original Factory Service

We provide ISO17025-certified laboratory calibration services for the full range of PQ50 products，and all models such as EDYBT-4 come with NIST traceable certificates。Our technical team holds ASNT Level Ⅲ certification and can provide on-site guidance for installation and commissioning of complex models such as KYB18G。Contact us now to obtain an exclusive technical solution for ZWP-L61-K。