GB 30439.5-2013Safety requirements for industrial automation products - Part 5: Safety requirements for flowmeter (English PDF)

3.1 Equipment and devices

3.1.1 Stationary equipment fixedflowmeter Fixed to the support member or an additional fixture at a specific location. [GB 4793.1-2007, the definition 3.1.1]

3.1.2 PERMANENTLY CONNECTED EQUIPMENT permanentlyconnectedflowmeter Only method of permanent connection with the tool to disconnect the power supply and electrical connection devices. [GB 4793.1-2007, the definition 3.2.2]

3.1.3 Tools tool , Including keys and coins, including an external device to help people to perform some kind of mechanical function and use. [GB 4793.1-2007, the definition 3.1.5]

3.2 Parts and Accessories

3.2.1 Terminal terminal For the apparatus (device) connected to an outer conductor provided in one kind of element. It may contain one or more terminal contacts, so that the term also includes sockets, connectors and the like. [GB 4793.1-2007, the definition 3.2.1]

3.2.2 Functional ground terminal functionalearthterminal To a point directly measuring or control circuit, or directly with a shield portion is electrically connected, but also reservations To be used for any function other than safety purposes purpose a ground terminal. [GB 4793.1-2007, the definition 3.2.2]

3.2.3 Protective Conductor Terminal protectiveconductortriennial For security purposes with the conductive parts of equipment are connected, but also with a predetermined external terminal connected to protective earthing system. [GB 4793.1-2007, the definition 3.2.3]

3.2.4 Housing enclosure Protect the unit against certain external influences and prevent parts from any direct contact with the direction provided. [GB 4793.1-2007, the definition 3.2.4]

3.2.5 Baffle barrier Prevent parts from any direction normal close direct contact provided.

Note. The housing and bezel provides flame spread protection [see 9.2.1b)]. [GB 4793.1-2007, the definition 3.2.5]

3.3 Electrical values

3.3.1 Rated (value) rated (value) Usually by the manufacturer for the components, apparatus, or device reaches a given magnitude of working status. [GB 4793.1-2007, the definition 3.3.1] Rating rating A set of ratings and working conditions. [GB 4793.1-2007, the definition 3.3.2]

3.3.2 Operating voltage workingvoltage When the device is supplied at rated voltage, maximum voltage AC or DC voltage values on any particular insulation can occur.

Note 1. The instantaneous value is not considered.

Note 2. The open circuit conditions and normal operating conditions are to be considered. [GB 4793.1-2007, the definition 3.3.3]

3.4 Test

3.4.1 Type test typetest For a particular design, in order to prove that the design and structure is able to meet one or more requirements of this part and of one or more devices Taiwan sample (or device components) tests carried out. [GB 4793.1-2007, the definition 3.4.1]

3.4.2 Routine tests routinetest After fabrication or manufacture to determine the means (equipment) meets a criterion and for each separate device (device) test (See Appendix F). [GB 4793.1-2007, the definition 3.4.2]

3.5 Security Terminology 3.5.1 (Parts) palpable accessible (ofapart) With the standard test finger or test pin accessible. [GB 4793.1-2007, the definition 3.5.1]

3.5.2 Dangerous hazard Potential source of harm. [GB 4793.1-2007, the definition 3.5.2]

3.5.3 Hazardous live hazardouslive Electric shock or electrical burn make it under normal condition or single fault condition.

Note. The value of the normal conditions apply, see 6.3.1, for higher under a single fault condition is applicable values see section 6.3.2. [GB 4793.1-2007, the definition 3.5.3]

3.5.4 Protective impedance protectiveimpedance A combination of components, component or components of the basic insulation and current limiting or pressure-limiting device when it is connected to ACCESSIBLE conductive parts and dangerous Between live parts when the risk degree of protection impedance, structure and reliability under normal and single fault conditions provided in this section reached Claim. [GB 4793.1-2007, the definition 3.5.7]

3.5.5 Protection connection protectivebonding To make electrical ACCESSIBLE conductive parts or protect the screen and for the external protection conductor is connected with electrical continuity and having carried connection. [GB 4793.1-2007, the definition 3.5.8]

3.5.6 Normal use normaluse Operation according to instructions or intended use by the apparent instructions, including standby. NOTE. In most cases, the normal use also refers to normal conditions, because the use of manual warns users not to use the device under abnormal conditions. [GB 4793.1-2007, the definition 3.5.9]

3.5.7 Normal conditions normalcondition All protective measures to prevent dangerous conditions are intact. [GB 4793.1-2007, the definition 3.5.10]

3.5.8 Single fault condition singlefaultcondition Protective measures to prevent the risk of a failure condition occurs or is likely to cause some dangerous and a fault condition.

Note. If a single fault condition will inevitably lead to another single fault conditions, such a two failures are considered a single fault condition. [GB 4793.1-2007, the definition 3.5.11]

3.5.9 Operator operator According to the intended use of the device to operate the equipment man.

Note. the operator for this purpose should be properly trained. [GB 4793.1-2007, the definition 3.5.12]

3.6 Insulation

3.6.1 Basic insulation basicinsulation Whose failure can cause a shock hazard insulation.

Note. The basic function of insulation can be used for insulation purposes. [GB 4793.1-2007, the definition 3.6.1]

3.6.2 Additional insulation supplementaryinsulation Independent insulation applied in addition to basic insulation, in order to ensure that when once the basic insulation failure can still prevent electric shock. [GB 4793.1-2007, the definition 3.6.2]

3.6.3 Double insulation doubleinsulation Constituted by the basic insulation and supplementary insulation. [GB 4793.1-2007, the definition 3.6.3]

3.6.4 Reinforced insulation reinforcedinsulation Its ability to provide protection against electric shock is not less than double insulation insulation, it can not as a separate image into several layers of additional insulation or basic insulation Insulation test line configuration. [GB 4793.1-2007, the definition 3.6.4]

3.6.5 Pollution polution It will lead dielectric strength or surface resistivity reduced solid, liquid or gaseous (ionized gas) additional foreign substances. [GB 4793.1-2007, the definition 3.6.5]

3.6.6 Pollution degree (in the micro-environment) polutiondegree (inthemicro-environment) To determine the clearances and creepage distances, the pollution degree microenvironment as the following three grades.

Note 1. The build-up of foreign matter and moisture can cause conductive insulator contamination.

Note 2. The minimum clearances for pollution degree Pollution Degree 2 and 3 are given based on experience rather than raw data. [GB 4793.1-2007, the definition 3.6.6]

3.6.6.1 Pollution Level 1 polutiondegree

1 Pollution can only dry non-conductive pollution, the pollution has no adverse effect. [GB 4793.1-2007, the definition 3.6.6.1]

3.6.6.2 Pollution Level 2 polutiondegree

2 Normally only non-conductive pollution, but occasionally due to condensation and short conductive. [GB 4793.1-2007, the definition 3.6.6.2]

3.6.6.3 Pollution Level 3 polutiondegree

3 Conductive pollution or dry non-conductive pollution which becomes conductive due to condensation.

Note. In this condition, the device is usually to prevent exposure to direct sunlight, rain, strong wind pressure, but it need not control the temperature or humidity. [GB 4793.1-2007, the definition 3.6.6.3]

3.6.7 Clearance clearance Space the shortest distance between two conductive parts. [GB 4793.1-2007, the definition 3.6.7]

3.6.8 Creepage distance creepagedistance Along the shortest distance between two conductive insulating solid surface material parts. [IEV151-15-50] [GB 4793.1-2007, the definition 3.6.8]

3.7 and associated product definition

3.7.1 Flowmeter flowmeter Flow measuring instruments. Usually it consists of primary and secondary device component unit.

3.7.2 A means primarydevice Means for generating traffic signal. According to the principle employed, a device may be inside or outside the pipe.

3.7.3 Secondary means secondarydevice Receiving a signal from a device and display, record, convert and (or) means transmitting the signal to obtain flow values.

3.7.4 Power supply mains The use of the meter is designed to require that they are connected to the meter to provide electricity for the purpose of low voltage power supply system.

3.7.5 Power supply circuit mainscircuit Intended to be connected with the power supply for providing power meter circuit.

4.4 Test under single fault conditions

4.4.1 Overview It should be according to the following requirements. Fault

a) Check the meter and the circuit diagram can usually determine whether there may be dangerous and therefore whether it should be applied condition;

b) In addition to proof of a specific fault conditions likely to cause danger, the test shall be made by the fault, or select Check Verify compliance provisions of an alternative method to replace the failure test;

c) the reference flowmeter shall work under test conditions (see 4.3) the most unfavorable combination of conditions, for different faults, which combined strip Member can vary, these combined conditions should be recorded during each test.

4.4.2 Fault conditions imposed Fault conditions 4.4.2.1 ~

4.4.2.6 should include provisions for fault conditions. These fault conditions can only be applied to one and should press Sequentially applied in any convenient order, can not be applied more than one fault at the same time, the results unless it is applied to a fault caused by a fault. After each applied once the fault condition, the flow meter or parts shall pass the applicable test 4.4.4.

4.4.2.1 Impedance protection

a) If the impedance protection is a combination of components to form, it should be shorted or open each component, choose one of the more not Lee's.

b) If the impedance protection by basic insulation and current limiting or pressure-limiting devices to form, the basic insulation and current limiting pressure limiting device, or both Caught should afford a single fault condition, once applied to a fault condition. Basic insulation should be short-circuited, while limiting Or pressure-limiting...