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UAGCSPSEWLBU

NDIR係統存在的一個主要問題是隨著時間的推移，如何準確地知道發送給檢測器的光線變化是否真的因氣體吸收所引起，而不是光源變化或者艙室污染所引起。盡管在NDIR係統工作之初進行校正是可能的，但是為了應對隨著時間推移而出現的光源變化和艙室污染問題，要求不斷進行校準。這樣做成本很高昂、耗費時間，並且在長期現場運行過程中也不可行。解決這個問題的一個方法是，在你的係統中使用一條基準通道。該基準通道包含一個檢測器，在沒有光線吸收的範圍內測量光源。現在，氣體濃度由兩個發送光量之比來決定。光源偏差引起的任何誤差現在都被抵消。這種偏差導致長期漂移，其出現在較大的時間段內。因此，無需同時對基準和有源通道進行採樣。你可以使用一個輸入多路復用器(MUX)來在兩條通道之間切換，從而降低係統成本和復雜程度，並同時維持度

在NDIR係統中用作紅外檢測器的熱電堆根據其接收的入射光多少(單位為瓦特)來產生電壓。被測氣體類型、其吸光係數和氣體濃度範圍都影響熱電堆檢測器的入射光線量。它產生熱電堆輸出電壓(範圍通常為數十μV)。因此，你需要設計出具有使用不同增益放大熱電堆輸出電壓功能的電子支持組件。可以通過一個含內置PGA的模擬前端(AFE)來處理這種情況。要求使用數百到數千V/V範圍的增益設置，來把小熱電堆信號放大到係統全刻度模數轉換器(ADC)，從而實現大係統度。

WS-X6748-GE-TX Cisco Express Forwarding 720 Interface Module Switch 48 ports -

WS-X6748-GE-TX Cisco Exp. Forw.720 Interface Module Switch 48 ports ma

WS-X6724-SFP CISCO Gigabit Interface Module 6500/7600 24 ports

WS-X6708-10G-3C Cisco 8-Port 10 Gigabit EN Module with DFC3C module 8 ports

WS-X6708-10G-3C Cisco 8-Port 10 Gigabit EN Module with DFC3C module 8 po

WS-X6704-10GE Cisco 6500 10 Gigabit EN Interface Module 4 ports

WS-X6548-GE-TX Cisco Switching Module FREE 1 YEAR

WS-X6516-GE-TX CATALYST 6500 16-PORT GIG/COPPER MODULE X-BAR

WS-X6502-10GE CISCO 6500 10 GIGABIT ETHERNET BASE MODUL

WS-X6148-GE-TX Cisco Classic Interface Module Expansion module 48 ports

WS-X6148A-GE-TX Cisco Classic Interface Module Expansion module 48 ports Switch

WS-X6148A-GE-45AF CISCO 6500 SWITCH MODULE 48 Ports POE 802.3AF

WS-X4904-10GE Cisco 4-Port 10 Gigabit Ethernet X2 Expansion Module

WS-X4712-SFPE Cisco Catalyst 4500 E-Series 12Pt.-10GBE SFP MODULE

WS-X4648-RJ45V-E Cisco Catalyst 4500E Series Line Card Switch 48 ports

WS-X4648-RJ45VE Cisco 48-Port PoE Line Card 48 x 10/100/1000Base-T LAN

WS-X4648-RJ45-E CISCO Catalyst 4500E Series Line Card Switch 48 ports

WS-X4648-RJ45-E CATALYST 4500 E-SERIES 48-PORT 10/100/1000 RJ45

WS-X4624-SFP-E Cisco Line Card E-Series Expansion module 24 ports

WS-X4624-SFP-E CATALYST 4500 E-SERIES 24-PORT GE SFP

WS-X4624-SFP-E 2YR ServerPartsCanada.com

WS-X45-SUP6L-E Cisco Supervisor Engine 6L-E Control processor

WS-X45-SUP6-E Cisco Supervisor Engine 6-E Control processor 1YR WARRAN

WS-X45-SUP6-E Cisco Supervisor Engine 6-E Control processor

WS-X4516 Cisco Supervisor Engine V 4516 Control processor

WS-X4515 CISCO CATALYST 4500 SUPERVISOR IV ENGINE W/2 GE

WS-X4448-GB-SFP CISCO CATALYST 4500 48-PORT 1000BASE-X

WS-X4148-RJ21 CATALYST 4500 10/100 MODULE 48-PORTS TELCO 4XRJ21

WS-SVC-WISM-1-K9 CISCO Wireless Service Module WiSM for up to 300 Lightweight

WS-SVC-SSL-1-K9 CISCO SSL MODULE FOR CATALYST 6500

WS-SVC-FWM-1-K9 Cisco Firewall Service Module Security appliance

WS-SVC-CMM-6T1 6-PORT T1 INTERFACE PORT ADAPTER

WS-SVC-CMM-6E1 6-PORT E1 INTERFACE PORT ADAPTER 1YR - ASK 4 QTY

WS-SUP720-3BXL Cisco Supervisor Engine 720-3BXL Control processor

WS-SUP720-3BXL WS-X6716-10G-3CXL CiscoDeal

WS-SUP720-3BXL 1 WS-X6708-10G-3C Super Cisco Bundle

WS-SUP720-3B Cisco Supervisor Engine 720 with PFC3B Control processor

WS-SUP720 Cisco Supervisor Engine 720 Control processor

WS-G5487 GENUINE CISCO 1000BASE-ZX EXTENDED REACH GBIC S.MODE

WS-G5486 LL GBIC FOR CISCO 1000BASE-LX/LH LONG HAUL S.MODE OR M.MODE

WS-G5486 CISCO 1000BASE-LX/LH LONG HAUL GBIC SINGLEMODE OR MULTIMODE

WS-F6K-PFC3B CATALYST 6500 SUP720 POLICY F. CARD-3B 1YR - ASK 4 QTY

WS-F6K-MSFC2 CATALYST 6000 MULTILAYER SWITCH FEATURE CARD MSFCII SPARE

WS-F6K-DFC3A DIST FWD CARD-3A FOR 65XX 6816 MODULES WITH SUP720

WS-F6700-DFC3C Cisco Distributed Forwarding Card 3C Switching accelerator

WS-F6700-DFC3BXL Cisco Distributed Forwarding Card 3BXL Switching accelerator

WS-F6700-DFC3B Cisco Distributed Forwarding Card 3B Switching accelerator

WS-CE500G-12TC Cisco Catalyst Express 500G-12TC Ethernet Switch

WS-CDC-2500W CATALYST 6500/7600 2500W DC POWER SUPPLY

WS-CDC-1300W CATALYST 6500 1300W DC POWER SUPPLY

WS-C6509-E SUP720-3BXL X6724-SFP X6748 6509

WS-C6509-E CATALYST ENHANCED 6509 CHASSIS 9 15RU

WS-C6509 CISCO CAT 6509 CHASSIS 9 15RU

WS-C6506-E-FAN CATALYST 6506-E CHASSIS FAN TRAY

WS-C6506-E CATALYST 6506 ENHANCED CHASSIS 6 12RU

WS-C6506 CISCO CAT 6506 CHASSIS 6 12RU W/1300W AC PS

WS-C6503-E ENHANCED CISCO CAT 6503 CHASSIS 3 4RU

WS-C6503 CISCO CAT 6503 CHASSIS 3 4RU

WS-C4507R CATALYST 4500 CHASSIS 7-

WS-C4506-E CISCO

WS-C3750G-48TS-S CISCO 3750G-48TS SWICTH W/1 YR -WSC3750G48TSS

WS-C3750G-16TD-S FREE 1 YEAR - CATALYST 3750G SWITCH

WS-C3750-24P-AP50 CISCO WS-C3750-24PS-S AND AIR-WLC-4402-50 BUNDLE

WS-C3560V2-24TS-SD FREE 1 YEAR CISCO 3560V2 SWITCH

WS-C3560E-48TD-SD FREE 1 YEAR -3560E CISCO SWITCH

WS-C3560E-48PD-SF FREE 1 YEAR CISCO WSC3560E48PDSF

WS-C3560-48PS-S CISCO 3560-48PS SWICTH W/1 YR -WSC356048PSS Fast Shipp

WS-C3560-24TS-S Cisco Cat 3560 SWITCH 24 10/100 2 SFP SLOTS

WS-C3550-24PWR-SMI CISCO CAT SWITCH 24-10/100 INLINE POWER 2 GBIC PORTS: SMI

WS-C3550-24-DC-SMI CISCO 3550 SWITCH 24-10/100 2 GBIC PORTSDC-PWRD: SMI

WS-C3550-12T CISCO SWITCH 10-10/100/1000 PORTS 2 GBIC PORTS: EMI

WS-C3550-12G CISCO SWITCH 10 GBIC PORTS 2-10/100/1000 PORTS: EMI

WS-C2970G-24TS-E CISCO Switch w/1year -WSC2970G24TSE 2970G24TSE

WS-C2960S-24TS-L CISCO 2960S-24TS SWICTH W/1 YR -WSC2960S24TSL Fast Sh

WS-C2960-48TC-S CISCO CATALYST 2960-48TC SWITCH-1YEAR - GRADE A Fast Shi

WS-C2960-24TC-S CISCO 2960-24TC SWITCH- W/1YR - WSC296024TCS Fast

WS-C2960-24-S Cisco Catalyst 2960-24-S Switch 24 ports managed

WS-C2960-24LT-L Cisco Catalyst 2960 Switch 24 ports managed

WS-C2955C-12 Cisco Catalyst 2955C-12 Ethernet Switch 12TX W/MM UPLINKS

WS-C2950T-48-SI CISCO CAT. SWITCH 48 10/100 2 10/100/1000BASE-T UPLINKS STD I

WS-C2950G-48-EI CISCO CAT. SWITCH 2950 48 10/100 WITH 2 GBIC SLOTS

WS-C2950G-24-EI-DC CISCO SWITCH 24 10/100 2 GBIC SLOTS DC VERSION

WS-C2940-8TT-S 8 10/100 ETHERNET PORTS AND 1 10/100/1000 ETHERNET PORT

WOODWARD NETCON 5000 5466-315 REV C ANALOG I/O MODULE

WOODWARD NETCON 5000 5466-258 REV E DISCRETE I/O MODULE

WOODWARD NETCON 5000 5466-031 REV D I/O CONTROLLER

Woodward Governor 5466-258 Module Discrete I/O NIP 8097

Woodhead SST-PFB-CLX PROFIBUS Scanner for ControlLogix READ

Woodhead SST-PFB-CLX PROFIBUS Scanner for Allen-Bradley

Woodhead SST SST-PFB-SLC ProfiBus Scanner for Allen Bradley SLC500

Woodhead SST SST-PFB-PLC5 ProfiBus Coprocessor for Allen Bradley PLC5

Woodhead SST Allen Bradley 5136-SD-ISA DH/DH/RIO ISA Interface Card

WMD PDO PHASE DISPLACEMENT OSCILLATOR MODULAR EURORACK MODULE

With GBICs