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完整的測量系統(tǒng)通常由兩個稱重傳感器、一個接線盒、一個帶有兩個測量通道的控制單元和電纜組成。A B和A+B差A-B稱重傳感器接線盒控制單元稱重傳感器電纜適配器板PFXC 141輸出信號圖1。完整測量系統(tǒng)1.4.2測力傳感器PFTL 101測力傳感器安裝在滾動軸承下方，用于測量平行于安裝表面的力。來自腹板/帶材的反作用力與腹板/帶材張力成比例，通過軋輥和軸承傳遞到稱重傳感器。稱重傳感器通過接線盒連接到控制單元。控制單元將稱重傳感器信號轉換為與反作用力成比例的直流電壓。根據(jù)選擇的控制單元，可以獲得兩個單獨稱重傳感器（A和B）的模擬信號、稱重傳感器信號的總和（A+B）和/或稱重傳感器信號之間的差值（A-B）。壓力導管枕木稱重傳感器，水平測量PFTL 101，用戶手冊1簡介3BSE009965R0401 en Rev F 7 1.4.3測量原理稱重傳感器僅測量FR方向上的力。測量力可以為正或負。稱重傳感器通常安裝在滾動軸承下方。當卷上有張力的腹板/帶材時，張力（T）產(chǎn)生兩個力分量，一個在稱重傳感器（FR）的測量方向，另一個在直角（FV）處。測量力取決于張力（T）和測量輥周圍的腹板/帶材形成的包角之間的關系。T T T FV W a p包裹角，如圖2所示。帶力矢量的測量輥壓力傳感器枕木稱重傳感器，水平測量PFTL 101，用戶手冊1簡介8 3BSE009965R0401 en Rev F 2說明2.1概述PFTL 101系列稱重傳感器有六種不同的測量范圍，從0.5到20 kN，兩種不同的尺寸（見2.2技術數(shù)據(jù)）。每個稱重傳感器都經(jīng)過單獨校準和溫度補償。稱重傳感器通常用六個螺釘安裝并固定在底座和軸承箱上，四個螺釘位于稱重傳感器的一側，兩個螺釘位于另一側。對于PFTL 101型的所有稱重傳感器，稱重傳感器室由單個鋼塊加工而成。然后將傳感器焊接到稱重傳感器室中，并進行定向，以使其在測量方向上對力敏感，在其他方向上對力不敏感。PFTL 101A、PFTL 101AE、PFTL 101B和PFTL 101BE型稱重傳感器由不銹鋼制成。PFTL 101A和PFTL 101B配有用于可插拔連接電纜的連接器。PFTL 101AE和PFTL 101BE配有固定連接電纜。PFTL 101AER和PFTL 101BER型稱重傳感器專門設計用于腐蝕性環(huán)境中的安裝。它們由耐酸不銹鋼制成，還具有固定連接電纜。圖紙中給出了所有稱重傳感器類型的尺寸。連接器或固定連接電纜測量方向如圖3所示。稱重傳感器PFTL 101 A/AE/AER
complete measuring system normally consists of two load cells, a junction box, one control unit with two measurement channels and cabling. A B SUM A+B DIFFERENCE A-B Load cell Junction box Control unit Load cell cabling Adapter plates PFXC 141 Output signals Figure 1. Complete Measuring System 1.4.2 Loads cells PFTL 101 The load cells are installed under the roll bearings, where they measure forces parallel to the mounting surface. The reactive force from the web/strip, which is proportional to the web/strip tension, is transferred to the load cells via the roll and the bearings The load cells are connected to the control unit via a junction box. The control unit converts the load cell signals to DC voltages that are proportional to the reaction force. Depending on which control unit is chosen, it is possible to have the analog signals for the two individual load cells (A and B), the sum of the load cell signals (A+B), and/or the difference between the load cell signals (A-B). Pressductor PillowBlock Load Cells, Horizontal Measuring PFTL 101, User Manual 1 Introduction 3BSE009965R0401 en Rev F 7 1.4.3 Principle of Measurement The load cell only measures force in the direction FR. The measurement force may be positive or negative. The load cell is normally installed under the roll bearings. When there is a web/strip in tension over the roll, the tension (T) gives rise to two force components, one in the direction of measurement of the load cell (FR) and one at right angles (FV ). The measuring force depends on the relationship between the tension (T) and the wrap angle formed by the web/strip around the measuring roll. T T FR FV W a p an Wrap angle Figure 2. Measuring roll with Force Vectors Pressductor PillowBlock Load Cells, Horizontal Measuring PFTL 101, User Manual 1 Introduction 8 3BSE009965R0401 en Rev F 2 Description 2.1 General The load cells in the PFTL 101 family are available in six different measuring ranges from 0.5 to 20 kN and two different sizes (see 2.2 Technical Data). Each load cell is individually calibrated and temperature compensated. The load cells are usually mounted and fixed to a base and a bearing housing with six screws, four on one side of the load cells and two on the opposite side. For all load cells of type PFTL 101 the load cell house is machined from a single block of steel. A sensor is then welded into the load cell house and oriented so that it is sensitive to force in the direction of measurement and insensitive in other directions. The load cell types PFTL 101A, PFTL 101AE, PFTL 101B and PFTL 101BE are made of stainless steel. PFTL 101A and PFTL 101B are equipped with a connector for the pluggable connection cable. PFTL 101AE and PFTL 101BE are equipped with a fixed connection cable. Load cell types PFTL 101AER and PFTL 101BER are specially designed for installation in corrosive environment. They are made of acid resistant stainless steel and they also have a fixed connection cable. Dimensions for all load cell types are given in A Drawings. Connector or fixed connection cable Measuring direction Figure 3. Load cells PFTL 101 A/AE/AER
