20t… 75t, Typ C3/C4/C5/C6
1. No corner adjustment necessary
2. High overload capacity
3. IP 68 (1.5 m/10.000 hrs) IP 69K (washdown cleaning)
4. Proven rocker-pin principle
5. Best overvoltage protection
6. Highest reliability
7. 100 % Maintenance free
8. Ex - version available
9. Patent pending: WO 01/18504, EP 1 227 306 A1
光柵式傳感器利用光柵形成的莫爾條紋把角位移轉(zhuǎn)換成光電信號(hào) 。光柵有兩塊，一為固定光柵，另一為裝在表盤(pán)軸上的移動(dòng)光柵。加在承重臺(tái)上的被測(cè)物通過(guò)傳力杠桿系統(tǒng)使表盤(pán)軸旋轉(zhuǎn)，帶動(dòng)移動(dòng)光柵轉(zhuǎn)動(dòng)，使莫爾條紋也隨之移動(dòng)。利用光電管、轉(zhuǎn)換電路和顯示儀表，即可計(jì)算出移過(guò)的莫爾條紋數(shù)量，測(cè)出光柵轉(zhuǎn)動(dòng)角的大小，從而確定和讀出被測(cè)物質(zhì)量。
參數(shù)
Maximum capacity highest limit of specified measuring range Emax 20 30 50 60 75 t
Max. usable load upper limit for measurements Eu 40 60 75 75 75 t
Destructive load danger of mechanical destruction Ed > 100 > 150 > 150 > 150 > 150 t
Rated output relative output signal at nominal load Cn 1 1 2 2.4 3 mV/V
for accuracy classes C4 atE max ≥ 60t, 1.5 1.5 1,5 mV/V
C5 atE max ≥ 50t
Nominal deflection max. elastic deformation under nominal load snom 0.3 0.3 0.6 0.7 0,8 mm
它利用電容器振蕩電路的振蕩頻率f與極板間距d 的正比例關(guān)系工作(圖6 )。極板有兩塊，一塊固定不動(dòng)，另一塊可移動(dòng)。在承重臺(tái)加載被測(cè)物時(shí)，板簧撓曲，兩極板之間的距離發(fā)生變化，電路的振蕩頻率也隨之變化。測(cè)出頻率的變化即可求出承重臺(tái)上被測(cè)物的質(zhì)量。電容式傳感器耗電量少，造價(jià)低，準(zhǔn)確度為1/200～1/500。
Accuracy class C3C4 C5 C6*
Accuracy class 0.015 0.012 0.010 0.008 % Emax
Minimum dead load lowest limit of specified measuring range Emin 0 0 0 0 % Emax
Min. LC verification minimum load cell verification interval Y 14,000 20,000 20,000 20,000
interval (vmin = Emax/Y)
Deadload Return factor for min. dead load output return Z 6,000 8,000 8,000 8,000
(DR = 1/2 Emax/Z) for Emax 50t: Z 6,000 6,000
Tolerance permissible deviation from rated output dc < 0.07 < 0.07 < 0.07 < 0.07 % Cn
on rated output
Zero output signal load cell output signal under Smin < 1.0 < 1.0 < 1.0 < 1.0 % Cn
