產(chǎn)品簡介
JWI200是一款高精度雙軸傾角傳感器,采用動態(tài)零位測試補(bǔ)償技術(shù)保證產(chǎn)品快速啟動,分辨率高、數(shù)據(jù)穩(wěn)定、承受沖擊震動能力強(qiáng);內(nèi)置32位ARM處理器,快速濾波運(yùn)算,輸出低精度數(shù)據(jù);本傾角傳感器設(shè)計(jì)有抗電磁干擾電路,系統(tǒng)工作穩(wěn)定,能長期工作于惡劣環(huán)境中。
參數(shù)規(guī)格
精度 | 0.001° | 測量范圍 | ±15° |
測量軸 | X-Y | 刷辨率 | 1Hz |
沖擊 | 20000g, 1ms, ½sine | 響應(yīng)頻率 | 在DC response時為5-300HZ |
波特率 | 4800~11520 | 零點(diǎn)漂移 | 在-25~85℃時為±0.0007°/℃ |
工作溫度 | -40~+55℃ | 存儲溫度 | -60~+80℃ |
交插靈敏度 | 在Max時為2% | 輸出阻抗 | 100Ω |
電源電壓 | 5~12VDC | 消耗電流 | ±50mA |
適用領(lǐng)域
更多信息
請登錄:www.jiweikeji.com
接口尺寸: | G1/2(mm) | 加工定制: | 是 |
防護(hù)等級: | IP65 | 測量范圍: | 0-160000(kPa) |
類型: | 陶瓷型壓力變送器 | 防爆等級: | EX |
型號: | S-20 | 測量介質(zhì): | 液體 氣體 |
精度等級: | 0.125 | 品牌: | WIKA/威卡 |
輸出信號: | 4-20(mA) | 電源電壓: | 10-30(V) |
WIKA S-20 高精度 高壓力范圍 壓力變送器
精度:0.125 1600bar
Superior pressure transmitter for general industrial applicationsModel S-20
Applications Critical industrial applications Demanding applications in research and development Harsh environments in the process industry
Special features Measuring ranges from 0 ... 0.4 to 0 ... 1,600 bar Non-linearity of up to 0.125 % of span Different output signals, e.g. 4 ... 20 mA, DC 0 ... 10 V,
DC 1 ... 5 V and others Market-standard electrical connections, e.g. DIN 175301-803 A angular connector Common international process connections
Description The model S-20 pressure transmitter for general industrial applications is the ideal solution for customers with demanding measuring requirements. It features a very good accuracy, a robust design and an exceptional number of variants, meaning it can be suited to the widest range of applications.
Versatile The model S-20 offers continuous measuring ranges between 0 ... 0.4 and 0 ... 1,600 bar in all the major units. These measuring ranges can be combined in almost any way with all the standard industry output signals, the most common international process connections and a wide number of electrical connections. Furthermore, it offers numerous options, such as different accuracy classes, extended temperature ranges and customer-specific pin assignments.
High quality The robust design turns the model S-20 into a very high quality product, which even the most adverse environmental conditions cannot affect. Whether with the lowest temperatures when used outdoors, with extreme shock and vibration in machine building or with aggressive media in the chemical industry, this transmitter can meet all requirements.
Availability All variants described in this data sheet are available on very short lead times. For particularly urgent demands, there is a sizeable stock available.
Measuring ranges
The given measuring ranges are also available in kg/cm2, kPa and MPa. Special measuring ranges between 0 ... 0.4 and 0 ... 1,600 bar are available on request. Special measuring ranges have a reduced long-term stability and increased temperature errors.
Overpressure limit The overpressure limit is based on the sensor element used. Depending on the selected process connection and sealing, restrictions in overpressure safety can result. A higher overpressure limit will result in a higher temperature error.
Measuring range < 10 bar/150 psi ≥ 10 bar/150 psi 3 times (standard) 2 times 1) (standard) 5 times 3 times 2) 3) 1) Restriction: max. 60 bar/870 psi with absolute pressure 2) Only possible for relative pressure measuring ranges ≤ 400 bar or 5,800 psi 3) Only possible for absolute pressure measuring ranges < 16 bar or 220 psi
Vacuum tightness Yes
Output signal
Signal type Signal Current (2-wire) 4 ... 20 mA 20 ... 4 mA Voltage (3-wire) DC 0 ... 10 V DC 0 ... 5 V DC 1 ... 5 V DC 0.5 ... 4.5 V DC 1 ... 6 V DC 10 ... 0 V Ratiometric (3-wire) DC 0.5 ... 4.5 V
Other output signals on request.
Permissible load in Ω Current output (2-wire): ≤ (power supply - 7.5 V) / 0.023 A ≤ (power supply - 11.5 V) /
0.023 A (with optional settling time of 1 ms) Voltage output (3-wire): > maximum output voltage / 1 mA Ratiometric output (3-wire): > 4.5k
Signal limiting (option) 4 ... 20 mA: Zero point: 3.6 mA 1), 3.8 mA, 4.0 mA Full scale: 20 mA, 21.5 mA, 23 mA DC 0 ... 10 V: Full scale: DC 10 V, DC 11.5 V 1) Not possible in combination with zero point adjustment by the customer
Voltage supply
Power supply Maximum power supply for cULus approval: DC 35 V (DC 32 V with heavy-duty connector) Current output (2-wire) 4 ... 20 mA: DC 8 ... 36 V (DC 12 ... 36 V with optional settling time of 1 ms) 20 ... 4 mA (inverted): DC 8 ... 36 V Voltage output (3-wire) DC 0 ... 10 V: DC 12 ... 36 V DC 0 ... 5 V: DC 8 ... 36 V DC 1 ... 5 V: DC 8 ... 36 V DC 0.5 ... 4.5 V: DC 8 ... 36 V DC 1 ... 6 V: DC 9 ... 36 V DC 10 ... 0 V: DC 12 ... 36 V Ratiometric output (3-wire): DC 0.5 ... 4.5 V: DC 5 V ±10 %
Dissipation loss Current output (2-wire): 828 mW (22 mW/K derating of the dissipation loss with ambient temperatures ≥ 100 °C) Voltage output (3-wire): 432 mW
Current supply Current output (2-wire): Current signal, max. 25 mA Voltage output (3-wire): max. 12 mA
Reference conditions (per IEC 61298-1)
Temperature 15 ... 25 °C
Atmospheric pressure 860 ... 1,060 mbar
Humidity 45 ... 75 % relative
Power supply DC 24 V DC 5 V with ratiometric output
Mounting position Calibrated in vertical mounting position with pressure connection facing downwards.
Time response 1) 3 dB limit frequency: 500 Hz2) 3 dB limit frequency: 1,000 Hz3) Alternative specifications for 4 ... 20 mA output signal: Load: ≤ (power supply - 11.5 V) / 0.023 A Power supply: DC 12 ... 36 V
Switch-on time 150 ms
Switch-on drift 5 s (60 s with optional zero point adjustment 0.1 %)
Accuracy data
Relationship to the mounting position For measuring ranges < 1 bar/15 psi, an additional zero offset of up to 0.15 %applies
Non-repeatability ≤ ±0.1 % of span
Temperature hysteresis 0.1 % of span at > 80 °C
Long-term drift (per IEC 61298-2) ≤ ±0.1 % of span ≤ ±0.2 % of span (with special measuring ranges)
Temperature error (for calibration temperature of 15 ... 25 °C) For measuring ranges < 1 bar, special measuring ranges and instruments with an increased overpressure limit the respective temperature error increases by 0.5 % of span
Operating conditions Permissible temperature ranges
Storage and transport conditions Permissible temperature range: -40 ... +70 °C Maximum humidity (per IEC 68-2-78): 67 % r.h. at 40 °C (in accordance with 4K4H per EN 60721-3-4)
Climate class Storage: 1K3 (per EN 60721-3-1) Transport: 2K2 (per EN 60721-3-2) Operation: 4K4H (per EN 60721-3-4, without condensation or icing)
Vibration resistance (per IEC 68-2-6) 20 g, 10 ... 2,000 Hz, (40 g, 10 ... 2,000 Hz for heavy-duty connector) For instruments with cooling elements a limited vibration resistance applies 10 g (10 ... 2,000 Hz)
Continuous vibration resistance (per IEC 68-2-6) 10 g
Shock resistance (per IEC 68-2-27) 100 g, 6 ms (500 g, 1 ms for heavy-duty connector)
Service life 100 million load cycles (10 million load cycles for measuring ranges > 600 bar/7,500 psi)
Free-fall test (following IEC 60721-3-2) Individual packaging: 1.5 m Multiple packaging: 0.5 m PE bag: 0.5 m
Process connections Available connections
Other process connections on request.
Process connections
Electrical connections
Available connections
Connection diagrams
Other pin assignments on request.
Electrical protective measures The electrical protective measures are not valid for ratiometric output signals. Short-circuit resistance: S+ vs. U- Reverse polarity protection: U+ vs. U- Resistance to overvoltage: DC 40 V Insulation voltage: DC 750 V
Materials
Wetted parts Relative measuring ranges: - Measuring ranges ≤ 10 bar/150 psi: 316L - Measuring ranges > 10 bar/150 psi: 316L + 13-8 PH Absolute pressure measuring ranges: - Measuring ranges ≤ 1,000 bar/10,000 psi: ASTM 630 and 13-8 PH - Measuring ranges > 1,000 bar/10,000 psi: 316L + 13-8 PH Sealing materials: see "Process connections"
Non-wetted parts Case: 316 Ti Zero point adjustment ring: PBT/PET GF30 Electrical connections: Angular connector DIN 175301-803 A: PBT/PET GF30 Angular connector DIN 175301-803 C: PBT/PET GF30 Circular connector M12 x 1 (4-pin): PBT/PET GF30 Circular connector M12 x 1 (4-pin, metallic): 316L Bayonet connector (6-pin) 316L + Al Field case: 316L, 316Ti Heavy-duty connector: 316L Cable outlet IP 67: PA66 Cable outlet ½ NPT conduit: 316L Cable outlet IP 68: 316L Cable outlet IP 68, FEP: 316L
Cable outlet IP 6K9K: 316L
Pressure transmission fluid Synthetic oil (for measuring ranges < 10 bar/150 psi relative and absolute pressure)
Options for specific media
CE conformity
Pressure equipment directive 97/23/EC
EMC directive 2004/108/EC, EN 61326 emission (group 1, class B) and interference immunity (industrial application)
EM field 30 V/m (80 ... 1,000 Mhz)
RoHS conformity Directive 2002/95/EC
Performance level (per EN ISO 13849-1:2008) Performance level: PL = C Category: Cat. = 1 Diagnostic coverage: DC = none MTTF: > 100 years
Certificates (option)
Available certificates 2.2 test report State-of-the-art manufacturing Wetted metallic parts Confirmation of the class and indication accuracy 3.1 inspection certificate Wetted metallic parts Wetted metallic parts with suppliers' certificate Confirmation of the class and indication accuracy List of single measured values DKD/DAkkS calibration certificate Certificates, see website
Scope of delivery
Test report Non-linearity 0.5 % 3 points Non-linearity 0.25 % 5 points Non-linearity 0.125 % 5 points
Packaging Individual packaging (standard) Multiple packaging (up to 20 pieces)
Instrument labelling WIKA label lasered (standard) Customer-specific label on request
Dimensions in mm Pressure transmitter model S-20 Process connections
Accessories and spare parts
Mating connector Ordering information Model / Measuring range / Overpressure limit / Output signal / Non-linearity / Calibration temperature / Zero point adjustment/ Process connection / Pressure channel / Sealing / Electrical connection / Assembly / Cable length / Shielding / Certificates /Packaging / Instrument labelling / Accessories and spare parts
歡迎致電咨詢定購WIKA S-20 高精度 高壓力范圍 壓力變送器 精度:0.125 1600bar
電話: 56291930 15910733293
傳真:
QQ:823377546 1491421115 2636968574
郵箱:sales@zoriver.cn
公司官網(wǎng):http://www.zoriver.cn http://www.zoriver.com.cn
液體渦輪流量計(jì)FLWG液體渦輪流量計(jì)是吸取了國內(nèi)外流量儀表先進(jìn)技術(shù)經(jīng)優(yōu)化設(shè)計(jì),具有結(jié)構(gòu)簡單、輕巧、精度高、復(fù)現(xiàn)性好、反應(yīng)靈敏,安裝維護(hù)使用方便等特點(diǎn)的新一代渦輪流量計(jì)。當(dāng)被測流體流過傳感器時,在流體作用下,葉輪受力旋轉(zhuǎn),其轉(zhuǎn)速與管道平均流速成正比,葉輪的轉(zhuǎn)動周期地改變磁電轉(zhuǎn)換器的磁阻值。檢測線圈中的磁通隨之發(fā)生周期性變化,產(chǎn)生周期性的感應(yīng)電勢,即電脈沖信號,經(jīng)放大器放大后,送至顯示儀表顯示。特點(diǎn):【1】輸出脈沖頻率信號,適于總量計(jì)量計(jì)與計(jì)算機(jī)連接,無零點(diǎn)漂移,抗干擾能力強(qiáng)【2】可獲得很高的頻率信號(3-4KHz),信號分辨力強(qiáng)【3】范圍度寬,中大口徑可達(dá)1:20,小口徑為1:10【4】結(jié)構(gòu)緊湊輕巧,安裝維護(hù)方便,流通能力大【5】專用型傳感器類型多,可根據(jù)用戶特殊需要設(shè)計(jì)為各類專用型傳感器,例如低溫型、雙向型、井下型等【6】工作電源: A 外電源:+24VDC±15%,紋波≤±5%,適用于4-20mA輸出、脈沖輸出、RS485等 B 內(nèi)電源:1組3.0V10AH鋰電池,電池電壓在2.0v-3.0v時均可正常工作【7】精度等級:1.0、1.5量程比:1:10;1:15;1:20
產(chǎn)品主要性能特征:
高對比度顯示屏,易于讀數(shù)大尺寸不銹鋼秤盤全自動故障檢測、超載保護(hù)單位轉(zhuǎn)換、計(jì)數(shù)功能自動外置砝碼校準(zhǔn)全量程去皮內(nèi)置可充電電池
YP10001詳細(xì)參數(shù)
型號 | YP10001 |
稱重范圍 | 0-1000g |
讀取精度 | 0.1g/1g |
重復(fù)性 | ±0.2g/±1g |
線性誤差 | ±0.2g/±1g |
秤盤尺寸 | 143mm×192mm |
外型尺寸(長*寬*高) | 280mm×180mm×80mm |
凈 重 | 1200g |
電 源 | 110V/220-240V AC |
testo110是一個高精度的溫度儀。加上保護(hù)軟套后使110使用于食品,實(shí)驗(yàn)室及冷藏/冷凍部門。它所用的技術(shù)是專為在冷藏室,櫥柜及室外使用所設(shè)計(jì)的。 • 配件套裝1 (用于不配保護(hù)軟套的溫度儀):多功能夾、掛繩和探頭夾 • 配件套裝2 (用于配有保護(hù)軟套的溫度儀):扣件、探頭夾 • 單位切換:°C/°F • 食品 • 14mm字高顯示、易于讀取 • 低電量顯示 • 保護(hù)軟套,可放入洗碗機(jī)清洗 • 適用于冷藏過程中的測量 • 高精度溫度儀帶標(biāo)定證書 • 精度高
測量食品儲存溫度 探頭種類 量程精度實(shí)驗(yàn)室探頭,可更換玻璃套管,耐腐蝕 -50…+150℃ 有撕拉帶的管道探頭,適用最大管徑75mm -50…+70℃ 不銹鋼高溫食品探頭,耐溫+275°C,特氟龍電纜耐溫+200°C (短時間內(nèi)可達(dá)250°C) 0…275℃ 食品探頭,不銹鋼制造(IP67),特氟龍電纜耐溫+200℃(短時間內(nèi)可達(dá)+250℃) -50…+150℃ 冷凍食品探頭,螺紋設(shè)計(jì) -50…+140℃ 插入式食品探頭,帶特殊手柄,IP65,加強(qiáng)電纜(PUR),防烘烤 -50…+150℃ 食品探頭(IP65),不銹鋼制造,PUR電纜耐溫+80℃,連接插頭IP54 -50…+150℃ 防水表面探頭,有擴(kuò)大的測量尖端 -50…+150℃ 空氣探頭,用于檢測倉儲溫度 -50…+150℃ 防水浸入/插入式探頭 -50…+150℃ 技術(shù)數(shù)據(jù)顯示 LCD 操作溫度 0... +40 °C 存放溫度 -20... +70 °C 電池種類 堿性電池9V 電池壽命 100 小時 尺寸 190x57x42 毫米 重量 300 克
保修 1 年
分體式冷水機(jī)主要應(yīng)用原子吸收、激光器、真空鍍膜機(jī)、離子刻蝕機(jī)、超低溫實(shí)驗(yàn)儀器、氧氮分析儀、X射線衍射儀,液壓源、油源等發(fā)熱設(shè)備。由于實(shí)驗(yàn)室空間小,制冷機(jī)在工作的同時產(chǎn)生了大量的熱量和噪音,為了給科技工作人員創(chuàng)造一個舒適安靜的工作環(huán)境,分體式冷水機(jī)是很好的選擇。聯(lián)系人:136-0107-4786 技術(shù)參數(shù):
* 溫度范圍:5~35℃;
* 控溫精度:±0.1℃;
* 制 冷 量:20℃時3000W;
* 水箱容積:40L;
* 循環(huán)泵大壓力:0~4.0Bar;
* 循環(huán)壓力調(diào)節(jié)范圍:1.5~3.6Bar;
* 循環(huán)泵大流量:0~45L/min;
* 儀器接口尺寸:1/2〞NPT
* 儀器室內(nèi)機(jī)尺寸:W425×D750×H770mm
* 儀器室外機(jī)尺寸: W800×D270×H530mm
* 儀器重量: 56KG+45KG
主要特點(diǎn):
* 溫度、壓力、水位均可顯示;
* 業(yè)設(shè)計(jì)的動態(tài)控溫系統(tǒng),控溫精度高,溫度波動;
* 簡捷方便的人機(jī)操作界面,控制參數(shù)自動記憶;
* 各種制冷功率和循環(huán)泵壓力,可滿足各類儀器的冷卻和恒溫;
* 制冷系統(tǒng)關(guān)鍵部件采用進(jìn)口名牌產(chǎn)品,工作穩(wěn)定可靠;
* 多種循環(huán)泵可以選配,可選超靜音、高壓力或大流量;
* 循環(huán)壓力可調(diào),配不銹鋼壓力指示表;
* 標(biāo)準(zhǔn)不銹鋼接口,可佩多種規(guī)格的接頭和軟管,外接閉路循環(huán);
* 可選配加裝RS485通訊,便于連接上位機(jī);
* 可選停電恢復(fù)功能,可選流量報警;
塑料四線五孔接線盒 不銹鋼10線11孔集線盒
SBC托利多傳感器 稱重顯示儀表 托利多稱重模塊
本公司是專門研究生產(chǎn)G856F高精度智能磁力儀的專業(yè)公司,公司擁有多名多年生產(chǎn)同類儀器的專家。G856F是一種高精度的智能磁力儀,是多年生產(chǎn)同類儀器經(jīng)驗(yàn)的結(jié)晶,是當(dāng)今國際國內(nèi)進(jìn)的質(zhì)子磁力儀,與G-856A和G-856AX兼容,其精度和穩(wěn)定性優(yōu)于G-856A和G-856AX;同時儀器線路板采用目前進(jìn)的CAD設(shè)計(jì),優(yōu)化元器件布局和布線,采用獨(dú)立的寬窗口LED顯示板,的IDC接插件,的國外進(jìn)口元件,儀器設(shè)有短路和電源接反等自動保護(hù)功能,配有RS232通信接口,可與USB接口相連輸出數(shù)據(jù),還可以外接電源,因此,儀器具有高穩(wěn)定性,高性,使用非常方便。 儀器可配有外控實(shí)時傳送接口,另加外控配件可實(shí)現(xiàn)數(shù)據(jù)與計(jì)算機(jī)的實(shí)時傳送與控制,進(jìn)行數(shù)字化采集。儀器內(nèi)有程序控制開關(guān),可以調(diào)節(jié)采樣,儀器在磁赤道附近及高梯度地區(qū)正常工作,而其它類型的儀器只能勉強(qiáng)工作,并且不能取得的數(shù)據(jù)。
工作原理:G856F質(zhì)子旋近磁力儀的原理是:根據(jù)質(zhì)子在磁場中的旋進(jìn)現(xiàn)象,因其旋進(jìn)頻率與磁場強(qiáng)度嚴(yán)格成正比,通過測量頻率從而實(shí)現(xiàn)測量出磁場強(qiáng)度F儀器主要由探頭和操作臺(主機(jī))組成。
技術(shù)參數(shù):分辨力(靈敏度): 0.1 NT精 度: 0.5 NT(常溫下)存儲量: 5700個手動測量計(jì)數(shù)或12000個自動測量計(jì)數(shù)顯示器: 6位LED顯示及3位雙排顯示調(diào)諧范圍: 25000--100000 NT梯度寬限: 4000 NT/M數(shù)據(jù)回放波特率: 110 至 9600 環(huán)境溫度: -20度至50度機(jī)內(nèi)時鐘: 5秒/月(常溫下)工作電壓: DC 12 V采樣時間: 4秒 至 999秒 可調(diào)機(jī)箱體積: 69 X 27 X 20 ( cm )主機(jī)重: 1.75Kg主機(jī)大。 270 X 170 X 85(MM)輸出: USB接口輸出數(shù)據(jù) (WINDOWS下回放,具有日變改正功能)
NA-42 高精度大量程噪音分析儀-[Rion]日本理音
NA-42,NA42高精度大量程噪音分析儀-[Rion]日本理音
【技術(shù)指標(biāo)】 測量功能: 瞬時聲級 Lp 、最大聲級 Lmax 、波形峰值 Lpeak 。 頻率范圍: 1Hz ~ 100kHz 在 1Hz 約 -2dB ,在 100kHz 約 -3dB 頻率計(jì)權(quán): A 、 C 、 FLAT 線性范圍:
麥克風(fēng) | 線性范圍 | 頻率范圍 | JIS | IEC60651 |
UC-53A | 28 ~ 145dB | 10Hz ~ 20kHz | C1505 | TYPE1 |
UC-52 | 28 ~ 146dB | 20Hz ~ 8kHz | C1502 | TYPE2 |
UC-34P | 10 ~ 112dB | 10Hz ~ 12.5kHz | C1505 | TYPE1 |
UC-29 | 50 ~ 164dB | 20Hz ~ 100kHz | C1505 | TYPE1 |
UC-27 | 20 ~ 145dB | 5Hz ~ 12.5kHz | C1505 | TYPE1 |
UC-31 | 34 ~ 155dB | 10Hz ~ 35kHz | C1505 | TYPE1 |
NA-42,NA42高精度大量程噪音分析儀-[Rion]日本理音
背景噪音: A 計(jì)權(quán): 1.5 μ Vrms 或更小、 C 計(jì)權(quán): 1.5 μ Vrms 或更小 FLAT特性:7 μ Vrms或更小、 FLATHPF 20Hz,LPF 20kHz:2.5 μ Vrms或更小 時間計(jì)權(quán): 快、慢,脈沖 RMS檢測 :由數(shù)字處理 內(nèi)置濾波器:高通 HPF : 3 階 Butterworth 濾波器, 20Hz-3dB 低通 LPF : 3 階 Butterworth 濾波器, 20kHz-3dB 標(biāo)定:內(nèi)部產(chǎn)生 1kHz 正弦信號 信號輸出: AC、DC、串口RS232C 顯示屏: 背光LCD 數(shù)字顯示: 5位數(shù)字顯示,顯示范圍70dB。 圖 顯示:顯示量程 50dB或20dB,顯 示周期0.1秒 電源: 4節(jié)干電池,連續(xù)操作可達(dá)14小時。AC適配器 環(huán)境條件: -10~50℃,10~90%RH 尺寸: 171H×120W×236Dmm。重量: 1.8千克
NA-42,NA42高精度大量程噪音分析儀-[Rion]日本理音
標(biāo)準(zhǔn)附件: • 電池四個• AC適配器一個 • 儀器箱一個 • 操作說明書一本
NA-42,NA42高精度大量程噪音分析儀-[Rion]日本理音
選購件:
• 麥克風(fēng) 及電纜等 • 軟件 • 聲音標(biāo)定
主要特點(diǎn): | ||||||
VT142使用新型PCI-E總線作為數(shù)據(jù)存取通道,使圖像采集速度更快,是為適應(yīng)計(jì)算機(jī)總線發(fā)展的新型圖像采集卡,它是在DH-VT121的基礎(chǔ)上擴(kuò)展為四通道彩色視頻采集卡,并基本消除了QP300在多路同時采集時存在的圖像拉道的現(xiàn)象。同時DH-VT142為用戶提供了自行加密的手段,可以保護(hù)用戶知識產(chǎn)權(quán)不受侵犯。
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