Nitto TGF450 Series, Руководство пользователя

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User’s Manual
Rev1.0
Date:15/07/2015 User’s Manual
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1 General
Every TGF450 thermal mass flowmeter will be carefully inspected before delivered to users.
Please carefully check if there is any damage on the package and product when you received them
Please check if the package contains all the accessories according to 1.2 or your purchase order.
Please make sure the person in charge of this device has carefully read this manual and understand its
descriptions.
1.1 Model Number and General Specification
Please check if the model number and specifications on the name plate match your requirement on the
purchase order.
Please kindly record the model number and instrument ID code, which will be required if you need and
service or support from us.
1.2 Packing List
When you recived the package, please check if it contains the items as below:
TGF450 thermal mass flowmeter x1
User’s manual x1
Calibration certificate x1
Quality certificate x1
Cable (For remote type only, length according to customer’s requirement)
Counter flanges (For wafer type, or for flanged type when customer requied so)
Screws and bolt (For wafer type, or for flanged type when customer requied so)
1.3 Storage
If the product needs to be stored for a long period before use, please be awared of below:
(1) The product should be kept in the origin package and same as it was when received.
(2) Please store the product in a proper location according to the requirements below:
Not in a uncovered field.
Not in a location where could have great vibration.
Please keep the enclosure of the meter closed.
The ambient temperature, atmospheric pressure and humidity should be:
Temperature:
-20~+60
℃
；
RH
：
5%~99%
；
Pressure
：
86~106Kpa
1.4 Measuring principle
TGF450 Series Thermal Mass Flowmeter measures gas mass flow base on thermal diffusion theory and thermal
principle of Newton , It have two RTD sensor (ref to picture 1.2) located in the flow. One RTD is heated to T1 by a
heating power rate of P, the other is not heated but to measure the medium temperature T2. So there is a
temperature difference T
D
=T1-T2 . T
D
reach max when mass flow is 0. When the mass flow Q increases, the heat
on T1 is taken away so the T1 decline and the T
D
become smaller. So there is a certain relationship between
heating power rate P, difference of temperature T
D
and mass flow Q as below:
P/ T
D
= K1 + K2 F(Q)
K3