Nanjing Wotian Technology Co., Ltd.

Pressure sensor manufacturing for 19 years.

Keywords: pressure sensor manufacturerHydraulic pressure sensorwater pressure sensorgas pressure transmitterdifferential pressure transmittergas pressure sensorwater pressure transmitteroil pressure sensorlevel sensorPressure transducerNanjing WotianPressure Sensor FactoryDifferential Pressure SensorLevel TransmitterPressure Transmitter

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  • PMA/PMF Adjustable Low Pressure Switch

PMA/PMF Adjustable Low Pressure Switch

Adjustment range: 2~150PSI

Maximum overpressure: 350PSI

Protection: IP00 (exposed terminal), IP69 (flying leads, Deutsch integral)

Diaphragm: Buna-N (optional EPDM, KAPTON ® or VITON ®)

Housing: brass (optional electroless nickel plated steel or 316 stainless steel)

Mechanical life: 1,000,000 cycles


Industrial and mobile hydraulic field as well as pneumatic, water process, refrigerant, air conditioning, beverage and other associated industries.

China factory set adjustable low pressure switch, creep action KAPTON diaphragm brass housing pressure switch

PMA mechanical adjustable low pressure switch is creep action type of ±3% repeatability. Adjustment range is 0.14-10bar. Average differential less than 10% of actuation point. It is applicable to hydraulic field, pneumatic, water process, refrigerant, air conditioning and beverage industries, etc.

Product Parameters

Performance Parameters


 Adjustment Range

   Avg. Differential


Adjustment Range

Avg.   Differential

PSI       Bar

  PSI           Bar


2 - 20

0.14 - 1.4

Less than 10% of
  Actuation Point


50 - 150

3.5 - 10

Less than 10% of
  Actuation Point


15 - 100

1.03 – 6.9



Gold contacts may be required for   less than 12 VDC and 20 milliamp


Diaphragm:   KAPTON®

(optional   EPDM, VITON®, Buna-N)

Housing:   Brass

(optional   Steel - Electroless Nickel Plated, 316 Stainless Steel)


Exposed   Terminals -IP00

Flying   Leads & Deutsch Integral - IP69


± 3% of full set   point range at 21°C
  Ambient Temperature


Creep   Action


1,000,000   cycles


BUNA-N:   -26~110
EPDM:   -23~121
KAPTON®:   -40~110
VITON®:   -18~150

(®   Registered Trademark of DuPont)


350 PSI (24 Bar)


0.07   kg

Production process

PMA/PMF Adjustable Low Pressure Switch


PMA/PMF Adjustable Low Pressure Switch

Company profile

PCM580 Digital Pressure Gauge (Φ80mm)

Nanjing Wotian Technology Co., Ltd. was established in 2005. It is an outstanding top sensor mkanufacturing enterprise in Jiangning District. The company was rated as Nanjing Engineering Technology Research Center and Nanjing. Municipal Engineering Research Center, Nanjing Enterprise Technology Center, Nanjing Postdoctoral Innovation Demonstration Base; is the unit that formulated the national standards for "Silicon Piezoresistive Pressure Sensitive Chips" and "Silicone Pressure Sensors". It is the leading domestic manufacturer of pressure sensors, with core technology of diffused silicon pressure sensor pressure transmitter, level sensor and temperature sensor and existing staff 305. The annual production of pressure sensors is more than 2 million. The products have been exported to more than 70 countries and regions. Nanjing Wotian was awarded the honorary title of "Sensor Application Program Demonstration Enterprise" by the Ministry of Industry and Information Technology in 2019. "Creating value for customers" is the goal that enterprises always pursue. As leading manufacturer in the domestic pressure sensor industry, the company will revitalize China's pressure sensor business as its own responsibility, work diligently, step by step, strive to make pressure sensors better, and provide customers with cost-effective sensors.  Nanjing Wotian Technology Co., Ltd. has passed ISO9001-2015 quality management system certification and TS16949 certification for the automotive industry.

Company advantage

Mass production

We have one production center in Nanjing and one production center in Anshan with 20,000㎡plant and 170 units of production equipments. The main annual capacity of sensors is about 2,000,000 pieces.

Imported equipments

We imported 20 sets of pressure controller and 150 units of testing ovens to our production line.

Informatization management

We have the information management system of CRM, PLM, ERP, MES and DINGDING etc.

Comprehensive testing

We have our own lab and testing equipment such as lightning stroke, surging, static electricity, vibration, high-low temperature impact test and helium mass-spectrum leak detection.