1. Introduction

Muffle furnace is a kind of equipment commonly used for high temperature treatment, but due to factors such as working environment and process, there may be a positive deviation alarm. This paper will introduce the solution of Muffle furnace positive deviation alarm in detail, and provide relevant data and case support.

2. Problem analysis

In the working process of Muffle furnace, the positive deviation alarm is a common problem. Positive bias is usually caused by:

2.1 Temperature control System Faults

Temperature control system is the key component of Muffle furnace to maintain stable temperature. If the temperature control system fails, such as temperature sensor damage, controller failure, etc., it may cause the temperature to exceed the preset range, causing a positive deviation alarm.

2.2 Change of working environment

The change of working environment will also affect the temperature stability of Muffle furnace. For example, changes in ambient temperature, changes in wind speed, etc., may affect the distribution of temperature in the furnace, resulting in positive deviation alarm microwave ashing Muffle furnace heating speed - uniform temperature field - corrosion resistant exhaust channel solution

3.1 Improve the stability of the temperature control system In order to solve the positive deviation alarm problem caused by the fault of the temperature control system, the following measures can be taken:

Check and maintain temperature sensors and controllers regularly to ensure that they are working properly.

Install a spare temperature sensor and controller for replacement.

Use high precision and high stability temperature sensors and controllers to improve the accuracy and stability of temperature control.

3.2 Optimize working environment conditions

In order to solve the positive deviation alarm problem caused by changes in the working environment, the following measures can be taken:

Control the ambient temperature around the furnace area to avoid excessive temperature change.

Ensure that the working area is well ventilated to avoid abnormal temperature rise.

4.1 Temperature control system fault Data

According to the analysis of historical data, the proportion of positive deviation alarm caused by the fault of temperature control system of Muffle furnace is about 5%. These failures are mainly caused by temperature sensor damage and controller failure.

4.2 Work environment change data

By analyzing the monitoring data of working environment, it is found that the change of ambient temperature and wind speed has a certain correlation with the temperature positive deviation alarm of Muffle furnace. When the ambient temperature rises or the wind speed becomes larger, the probability of positive deviation alarm will increase.