1 Scope
The Program is applicable to the pattern evaluation of various digital pressure gauges (hereinafter referred to as gauges) with measuring range of -0.1MPa~250MPa.
2 Normative References
For the purposes of the Program, the following documents are quoted:
JJG 875-2005 Digital Pressure Gauges
GB/T 2423.10-2008 Environmental Testing for Electric and Electronic Products - Part 2: Tests Methods - Test Fc: Vibration (Sinusoidal)
GB/T 17214.3-2000 Operating Conditions for Industrial-process Measurement and Control Equipment - Part 3: Mechanical Influences
JB/T 6239.1-2007 General Methods for Testing the Performance of Industrial Process Measurement and Control Instruments - Part 1: Common and Normal Mode Disturbance Immunity Tests
JB/T 6239.3-2007 General Methods for Testing the Performance of Industrial Process Measurement and Control Instruments - Part 3: Supply Voltage Depression Immunity Test
JB/T 6239.4-2007 General Methods for Testing the Performance of Industrial Process Measurement and Control Instruments - Part 4: Short-term Voltage Supply Interruptions Immunity Test
JB/T 6239.5-2007 General Methods for Testing the Performance of Industrial Process Measurement and Control Instruments - Part 5: Electrical Power Supply Fast Transient/Pulse Immunity Test
JB/T 7392-2006 Digital Pressure Instrument
JB/T 9233.11-1999 General Methods of Testing the Performance of Industrial Process Measurement and Control Instruments - Out Magnetic Field Effect
JB/T 9329-1999 Basic Environmental Conditions and Testing Methods for Instruments Transportation and Storage in the Transportation
For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
3 Overview
Gauge indicates the quantity value of measured pressure by digitals and can be used to measure the gauge pressure, pressure difference and absolute pressure of gas, liquid and steam.
Working principle of gauge: the measured pressure acts on pressure sensor via pressure medium. Pressure sensor outputs corresponding electric signal or digital signal; after the processing by electric signal processing unit, the quantity value of measured pressure is indicated on display directly. The block diagram of working principle is as shown in Figure 1.
Introduction i
1 Scope
2 Normative References
3 Overview
4 Legislation Management Requirements
4.1 Measurement Unit
4.2 Accuracy Class
4.3 Measuring Legislation Mark and Measuring Instrument Mark
4.4 Installation Mark
4.5 Test Prototype
4.6 Technical Information
5 Measuring Requirements
5.1 Indication Error
5.2 Return Error
5.3 Repeatability
5.4 Zero Error of Static Pressure
5.5 Zero Drift
5.6 Stability
5.7 Indication Value Fluctuation
5.8 Excess (Static) Pressure
5.9 Additional Function
6 General Technical Requirements
6.1 Appearance
6.2 Alternating Load
6.3 Insulation Resistance
6.4 Insulation Strength
6.5 Temperature Effect
6.6 Effect of Supply Voltage Variation
6.7 Out Magnetic Field Effect
6.8 Effect of Transient Overvoltage of Power Supply
6.9 Effect of Short-term Voltage Supply Interruption
6.10 Effect of Supply Voltage Depression
6.11 Effect of Common and Normal Mode Disturbance
6.12 Working Environment Resistance Vibration
6.13 Resistance to Transportation Environment
7 Pattern Evaluation Items
8 Test Methods and Conditions
8.1 Test Conditions
8.2 Test Methods
9 Judgment Principle for Pattern Evaluation Result
Annex A Original Record Format of Pattern Evaluation of Digital Pressure Gauges
