ATMF Plug-in Thermal Mass Flowmeter from China Manufacturer - Aister Instrument (Shanghai) Co., Ltd

Introduction Features Specifications Model Selection Application Installation

Introduction

The thermal mass flowmeter is an instrument for measuring gas flow by using the principle of thermal diffusion. The sensor consists of two reference thermal resistors (RTDS). One is the speed sensor RH, and the other is the temperature sensor RMG, which measures the temperature change of the gas. When the two RTDS are placed in the measured gas, one sensor RH is heated and the other sensor RMG is used to sense the measured gas temperature. As the gas flow rate increases, the airflow carries away more heat, and the temperature of the sensor RH drops.

The Insertion thermal gas mass flowmeter can be installed and maintained online. The installation process is to first weld a base with external threads on the outer wall of the pipeline, install a 1-inch stainless steel ball valve on the base, and then use a special tool to drill a hole with a diameter of 22mm, remove the special tool after the hole is drilled, and then install the sensor on the valve and insert the sensor into the center of the pipe (the insertion position of the sensor has been determined before the factory). Insertion thermal gas mass flowmeter suitable for pipe diameter: DN32 ~ 6000mm.

Features

1.No pressure and temperature compensation, direct measurement of gas mass flow, simple composition, small probability of failure.

2.Wide range ratio (greater than 100:1), convenient loading and unloading, easy to use.

3.Fast response, high accuracy, no moving parts, strong structure, vibration resistance.

4.High sensitivity, especially suitable for large diameter, low flow rate measurement.

5.Scene display, signal output, upper and lower alarm, etc.

6.It can be used in high temperature and corrupt environment.

Specifications

Performance	Technical parameter
Structural form	plug-in	pipe
Measuring medium	All gases (except acetylene)
Diameter range	Caliber DN32 or higher	DN10～DN200mm
Velocity range	0.1～120Nm/s
Precision	±1～2.5%
Operating temperature	Sensor：-40℃～+120℃ convertor：-20℃～+45℃
Working pressure	Medium pressure≤2.5Mpa	Medium pressure：4.0Mpa
Power supply	DC24V or AC220V≤18W
Response speed	1s
Output signal	4-20mA (Photoelectric isolation, large load 500Ω)、pulse、RS-485 (photoelectric isolation)、HART agreement
Alarm	1-2 relay normally open contact、10A/220V/AC、*/30V/DC
Type of supply	Separate structure, integrated structure
Pipe material	Carbon steel, stainless steel
Local display	Four lines of Chinese liquid crystal display
Display content	Mass flow, standard volume flow, cumulative flow, standard time, cumulative running time, standard flow rate, etc
Protection degree	IP65
Sensor material	Stainless steel	Stainless steel, carbon steel

Model Selection

01 Measure the medium, temperature, whether there is corrosion

02 Flow range and inside diameter of user pipe

03 Pressure rating

04 Whether to show on site

05 Working power supply

06 Signal output, communication

07 Whether to explosion-proof

08 Installation mode

09 Precision class

Application

Industrial process

Energy measurement

Environmental protection engineering

Transportation

Biotechnology

Scientific experiment

Marine meteorology

Rivers and lakes

Installation

1、Verify the actual internal diameters and wall thickness of the pipe before installing the Insertion thermal mass flowmeter.

2、First of all, 25 holes are opened in the pipeline, and the base is welded at the opening hole, and then the rest of the thermal mass flowmeter is loaded into the special ball valve together, and the depth to be inserted is calculated according to the actual pipe diameter and wall thickness. This step can be inserted to approximate size and hand tighten the nut.

3、Turn the sensor connecting rod so that the marked arrow is in the same direction as the medium flow.

4、According to the data measured in the field, convert the corresponding scale on the sensor connection rod, and lock the nut.

5、If you are horizontally installed, the display of this instrument can be flexibly installed at 90°, 180°, 270° to meet your actual needs.

Mounting base

    Do not weld in an explosive environment.
    The environment with special requirements for welding should be operated in accordance with the relevant requirements.
    The base is divided into two types according to the different installation methods: welding and clamping. When installing, the base should be located at the apex of the section direction of the pipeline, and the axis of the base through the hole is perpendicular to the axis of the pipeline. The effect diagram of the welded base has been installed (the welding position has been treated with rust prevention).

Installing ball valves

Secure the stainless steel valve to the base. Use a gasket on the crimped contact surface (nylon material is used when the medium temperature is below 100 ° C, copper material is used when the medium temperature is above 100 ° C).

Punching

    Before drilling holes, check the site environment carefully to ensure the safety of operations.
    Close the valve in time after drilling to avoid air leakage.
    In the case that online drilling is allowed, the opening tool of Sen Ling Instrument Co.Ltd. can be used to realize online installation without stopping production. See related instructions for the use of the tool. When stopping drilling, a variety of methods can be used to punch holes, to ensure that the axis of the hole and the base of the hole axis concentric. If the hole is opened by gas cutting, the drilling operation should be arranged before the base welding.

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