Instrument insulation box

Normally, since the outdoor temperature can drop below zero, it should be increased. However, today’s instrument electronic components have very high stability and can generally function properly at -20°C as well. Generally speaking, instruments equipped with capillaries do not require an insulated box, unless the temperature is extremely low and could damage the transmitter. Generally speaking, instruments equipped with pressure tapping pipes require insulation enclosures, as heating and cooling measures are implemented on the pipeline itself; it is difficult to apply such measures at the instrument panel. Additionally, for maintenance purposes and to prevent the measurement port from freezing, insulation enclosures are usually installed. The following is an explanation of the national standard: HG/T 20514-2014 Regulations for the Design of Heating and Insulation of Instruments and Pipelines > 3 Methods of Heating and Insulation 3.1 Heating 3.1.1 Heating shall be applied to the instrument and pipeline systems in which one of the following conditions exists: 1 There is a risk of freezing, condensation, crystallization, or precipitation at ambient temperature in the material measurement pipelines and testing instruments ； 2 Instruments that cannot meet the minimum ambient temperature requirements. 3.1.2 For heat-traced insulated systems located in an outdoor environment, the ambient temperature shall be taken as the local extreme minimum temperature ； For indoor heat-tracing and insulation systems, the ambient temperature should be taken as the lowest indoor temperature. 3.1.3 The heating for instruments and pipelines should be selected based on the process heating method. 3.1.4 Heat tracing methods are divided into hot water tracing, steam tracing, and electric tracing. The method of heat tracing should be selected in accordance with the following provisions: 1. Hot water heat tracing should be given priority as the method of heat tracing ； 2 Steam heating can be used in situations where there is no hot water source, or in testing systems where hot water heating does not meet the requirements ； 3 Electric heat tracing can be used in locations where high cleanliness standards are required for the environment, or in situations where precise temperature control, as well as remote and automatic control of the heat tracing system, is necessary. 3.2 Insulation 3.2.1 Insulation should be used for instrument and pipeline heating systems that meet one of the following conditions: 1 Instrumentation systems for hot fluids ； 2 When insulation methods can ensure the proper operation of instruments and pipelines ； 3 Applications such as steam or hot water pipelines for heat tracing, condensate return pipelines, and electric heat tracing tapes. 3.2.2 For instrument and pipeline heating, insulation should be used if one of the following conditions is met: 1 To prevent or reduce the increase in temperature of cold media and coolant media during instrument testing ； 2 To prevent dew formation on the outer surfaces of instrument equipment or pipelines at ambient temperatures ； 3 Measurement pipelines connecting the refrigeration equipment to the instruments.

First, determine whether it is an incubator or a protective box. For incubators, generally only the operating temperature suitable for the instruments (electronic components) needs to be considered. So as long as the temperature is low enough, both single and double flange pressure transducers are needed.

That's a good question. It is indeed the current situation in many factories. When the factory is located in areas south of the Yangtze River (it seems it starts to snow there south of the Yangtze River, haha), insulation enclosures are generally not taken into account in the design. Assuming that temperatures below zero can occur in the area, both the pipelines using pressure guiding tubes that are outdoors and ordinary pressure differential transmitters will be insulated and heated. At this time, the transmitter is placed in an insulated box. Whether it’s a single flange or a double flange. Why is insulation and heating applied only to the pipelines? So the transmitter is just ignored? ? ? I have asked this question too. I believe the reason might be that the insulation enclosures for these transmitters, whether single-flange or double-flange type, require special selection, and in addition, they are not easy to install. That’s what has led to the current situation.

If it is just an instrument protection box, the instrument gauges are installed inside it to provide protection against impacts and other hazards. If the medium may crystallize or freeze at ambient temperature, thereby blocking the pressure transducer tubes, an instrument insulation box is required; this box includes measures such as electric heating tapes to keep the pressure transducer tubes warm. If it is in an explosion-proof area, the insulation box also needs to take explosion protection into consideration.

There’s no need to consider explosion protection for incubators. Explosion protection means that the instrument itself is explosion-proof. It has nothing to do with the incubator.

This post was last edited by dxy3514 on 2019-6-14 at 15:15. Insulated boxes that contain electrical components need to be explosion-proof. It is the electrical components that need to be explosion-proof, not the entire insulated box.