Correct Use and Precautions of Industrial Instrument Overhaul and Maintenance Tools

There are two factors in the abnormal indication of petrochemical production instruments (high, low, unchanged, unstable, etc.):

First, technological factors;

The second is the instrument factor,

The process parameter indication is inconsistent with the actual due to the failure of a link of the instrument (detection environment). Therefore, instrument maintenance personnel should improve the ability of instrument fault judgment and be familiar with instrument principle, structure and performance characteristics, which can help instrument maintenance personnel expand their ideas and help them analyze and judge fault phenomena.

What kind of tools do we use in instrument maintenance?

Instrument workshop tool list

Tool details 1. Screwdriver

Precautions for use:

A screwdriver of appropriate specification shall be selected according to the size of the screw. It can not be used as a driver to avoid damaging tools or screws.

During live working, do not touch the metal rod of the screwdriver to avoid electric shock.

In order to prevent the metal rod from touching the human body or adjacent electrified body, the metal rod shall be sleeved with insulating pipe.

2. Wire pliers

Wire pliers are also called vice and vise, as shown in the figure. Wire pliers is a kind of hand tool used to clamp and fix workpieces or twist, bend and cut metal wires. Steel wire pliers are equipped with insulated handle. Generally, there are three specifications of steel wire pliers: 150mm, 175mm and 200mm. The withstand voltage of insulating sheath is 500V, so it can only be used for low-voltage live equipment.

Precautions for use:

Before use, check whether the insulation of the pliers is good, so as to avoid electric shock during live working.

When cutting the conductor with electricity, the knife edge shall not be used to cut two wires with different potentials at the same time (such as phase line and zero line, phase line and phase line, etc.) to avoid short circuit accidents.

3. Pointed nose pliers

The nose of pointed nose pliers is thin, which is suitable for narrow working space or live operation of low-voltage electrical equipment. Pointed nose pliers can also be used to cut small wires. It can be used for the manufacture or maintenance of instrument wire joints, which is flexible and convenient to use. When using pointed nose pliers, acid resistant plastic casing with insulating handle shall be selected, and the withstand voltage shall be more than 500V. The specifications of pointed nose pliers are 130mm, 160mm, 180mm and 200mm.

4. Wire stripping pliers

Wire stripper is a special tool used to exploit the insulation layer of small-diameter wire. Its shape is shown in the figure. Its handle is insulated and the withstand voltage is 500V. Commonly used are manual and automatic.

Automatic: adaptive according to the wire size inside the wire, so as not to damage the internal wire; And the stripping length can be adjusted.

5. Diagonal pliers

Diagonal pliers is also one of the commonly used pliers for maintenance. Its head is flat and oblique, also known as flat nose pliers. It is mainly used to cut wires, spare leads of components, and often used to replace scissors to cut insulating sleeves, nylon cable ties, etc. The handle is provided with an iron handle and an insulating pipe sleeve. For the commonly used diagonal pliers, the withstand voltage of the insulating handle shall be more than 1000V.

6. Electrician knife

The electrician knife is shown in the figure. It is suitable for cutting the insulation skin of conductor, wood pile and rope during assembly and maintenance. According to the size of the blade, electrical knives can be divided into large (112mm) and small (88mm).

Precautions for use:

It shall not be used for live working to avoid electric shock.

The knife edge shall be cut outward, and attention shall be paid to avoid hurting fingers.

When cutting the conductor insulation layer, the knife surface shall form a small acute angle with the conductor to avoid cutting the conductor.

After use, fold the blade into the handle immediately.

7. Adjustable wrench

Adjustable wrench, also known as adjustable wrench head, is a special tool used to tighten and loosen nuts. The adjustable wrench is composed of a head and a handle. The head is composed of a movable wrench lip, a wrench mouth, a solid wrench lip, a worm gear and a shaft pin, as shown in the figure. Rotate the worm gear to adjust the size of the wrench.

8. Electric pen

Also known as electric pen, it is a commonly used auxiliary safety appliance. It is used to check whether the conductor below 500V or the shell of various electrical equipment is charged. It can be carried with you. As long as you master the principle of the electric pen, combined with the well-known circuit knowledge, you can use many skills flexibly.

There are two commonly used:

Function of pen

Distinguish between AC and DC. When AC power passes through the test pen, the two poles in the neon bubble will light up at the same time, while when DC power passes through, only one pole in the neon bubble will light up.

Judge the positive and negative poles of DC. Connect the test pen between the positive and negative poles of direct current. The bright end of neon bubble is the negative pole and the non bright end is the positive pole.

Used as a zero line monitor. Connect one end of the test pen to the zero line and the other end to the ground line. If the zero line is open, the neon bubble will light up; If there is no open circuit, the neon bubble does not illuminate.

Determine whether the object has static electricity. If the neon bubble lights up when the finger stylus touches the object, it indicates that the object has static electricity.

9. Multimeter

Multimeter, also known as multimeter, is a multi-functional and multi range measuring instrument. Generally, multimeter can measure DC current, DC voltage, AC voltage, resistance, frequency, AC current, capacitance, etc.

There are two common types: digital multimeter and mechanical multimeter. Now, digital measuring instruments have become the mainstream and tend to replace analog instruments. Compared with analog instrument, digital instrument has high sensitivity, high accuracy, clear display, strong overload capacity, easy to carry and easier to use.

Correct Use and Precautions of Industrial Instrument Overhaul and Maintenance Tools 1

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