Shanghai Hongqi Instrument Co., Ltd. is a member of the National Technical Committee for Pressure Measurement Instruments Standardization. The company has participated in the drafting and revision of more than 20 national standards, industry standards, and national metrological verification regulations related to pressure instruments.

The company operates a Central Metrology Laboratory, with measurement traceability to national measurement standards. All factory inspections and type tests are conducted in accordance with applicable national and industry standards.

I. Major National Standards Participated in Drafting

1. GB/T 1226-2017 — General Pressure Gauges A key national standard for which Hongqi Instrument served as a drafting organization.

2. GB/T 1227 — Precision Pressure Gauges Hongqi Instrument participated in drafting this national standard.

3. JB/T 9273 — Electric Contact Pressure Gauges A machinery industry standard drafted with the participation of Hongqi Instrument Co., Ltd.

4. Specification for Selection and Installation of Pressure Gauges for Industrial Process Measurement and Control Hongqi Instrument participated as a drafting organization.

In addition, the company has participated in the development of several national metrological verification regulations (JJG) related to pressure gauges, covering general pressure gauges, precision pressure gauges, capsule pressure gauges, and other instruments.

Hongqi Instrument is among the few domestic instrument manufacturers involved in drafting metrological verification regulations.

II. Internal Testing and Metrological Standards Implemented by Hongqi Instrument Co., Ltd.

1. Pressure Instruments

• General Pressure Gauges and Vibration-Resistant Pressure Gauges: GB/T 1226

• Precision Pressure Gauges: GB/T 1227

• Electric Contact Pressure Gauges: JB/T 9273

• Capsule Pressure Gauges, Diaphragm Pressure Gauges, SF₆ Gas Density Gauges, and Dual-Pointer Pressure Gauges: Applicable industry standards and enterprise standards

• Pressure Transmitters and Differential Pressure Transmitters: GB/T 3386 Series and relevant national standards for industrial process measurement transmitters

• Explosion-Proof Instruments: GB 3836.1, GB 3836.2, and GB 3836.4 (Explosion-proof standards for explosive atmospheres, covering flameproof and intrinsically safe transmitters)

2. Temperature Instruments

Bimetallic Thermometers: JB/T 8803 — Bimetallic Thermometers

III. Metrology Laboratory and Measurement Traceability System of Hongqi Instrument Co., Ltd.

IV. Major Metrological Verification Regulations (JJG) Implemented for Product Calibration

Shanghai Hongqi Instrument Co., Ltd. implements national metrological verification regulations during production calibration and type testing, including:

• JJG 52 — General Pressure Gauges, Pressure-Vacuum Gauges and Vacuum Gauges with Elastic Sensing Elements

• JJG 49 — Precision Pressure Gauges and Vacuum Gauges with Elastic Sensing Elements

• JJG 573 — Capsule Pressure Gauges

• JJG 875 — Pressure Sensors (Transmitters) and other relevant pressure metrology regulations