Moeller/ Eaton EMR4-N100-1-B 

Moeller/ Eaton EMR4-N100-1-B 

机械式压力开关

上图为机械式压力开关，工作原理是两个空间气压变化时，膜片上的两个金属触点开或合，达到导通电路的作用，体积大，精度差，成本低。我们用压力校验仪进行了测试，发现压差到100帕时，设备仍未动作。有些施工单位为减少成本而选用机械式压力开关来代替余压探测器，万一发生火灾，无法联动泄压阀，防火门无法正常开启会造成严重后果。

2.免接气管式余压探测器

免接气管式余压探测器采用绝压式压力传感器芯片，直接测量前室或楼梯间大气压的变化。此方案不符合标准规范，并且很难测量准确。标准要求是：1.前室、封闭避难层(间)与走道之间的压差应为25Pa-30Pa；2.楼梯间与走道之间的压差应为40Pa～50Pa。标准明确要求了余压值是前室/楼梯间与走道的一个压力差值，并不是加压区域的大气压值的变化量。并且标准大气压是在10万帕以上，测量设备很难达到几帕的误差，25-30Pa，40-50Pa这个区间控制不准确。

六.问题解决办法

1.在设计阶段，图纸应该明确要求采用数字式余压探测器，能够直接通过屏幕观察到余压值，并且25-30Pa（前室），40-50Pa（楼梯间）应设置成定值，不允许改动。

2.系统验收时，用手持压力校验仪（推荐型号希玛AS510）对余压系统进行加压测试，当压差值加到30Pa（前室探测器）或50Pa（楼梯间探测器）时，观察探测器是否发信号动作，泄压阀是否联动。

3.系统验收时，查看探测器气管安装是否规范，测量的是否是前室与走道，楼梯间与走道的压差。

Moeller/ Eaton EMR4-N100-1-B  Schroff Strut between cover A and B, PN 20849-009

Schroff 19" Rackmount Aluminum Chassis w/ VME Backplane

SCHROFF SPG-124 USPP SPG124

SCHROFF 60127-315 NSFP 60127315

SCHROFF 23000-207 USPP 23000207

SCHROFF 60817-132 NSPP 60817132

NEW Intel Schroff APLCARM Cable Management Arm C92778-1

SCHROFF 60800-380 NSPP 60800380

SCHROFF 20835-455 NSPP 20835455

SCHROFF SURFBOARD CLOTHING ART RARE 80'S STICKER

SCHROFF 44A731133-001R02 NSPP 44A731133001R02

SCHROFF 44A731133-001R02 NSFP 44A731133001R02

Schroff backpanel VME J1 System Bus 14 Slot 23000-644

SCHROFF D32-23021-610 NSFP D3223021610

SCHROFF V4R2T2-1 NSPP V4R2T21

Hoffman CWHK Keylock Schroff number (12406478)

Schroff BPL000763 23098-139 Shelf Manager 5 U System

SCHROFF HDB-60B-30 POWER SUPPLY NIB

Toyo TF120220RA Toyo Fan Schroff 60703-004 Mod.tf1202

Schroff Type PSG 105 Power Supply 230VAC In 5VDC Out #4

Hoffman Schroff Computer Work Station Cabinet

Schroff Type PSG 105 Power Supply 230VAC In 5VDC Out #5

Schroff 23098-139 I/O Card ACB-II Shelf Manager

Schroff Type PSG 105 Power Supply 230VAC In 5VDC Out #3

Schroff VME Monolithic 6-Slot Board, PN: 23000-466

Hoffman Schroff Computer Work Station Cabinet Mobile

Schroff Type C 3U Test Adapter/Extender Card 23021-652

SCHROFF CLOTHING SURFBOARD ART RARE 80'S JACKET COAT

Schroff Type SEK 112 Powr Sup 100-240VAC 12VDC Out #1

200 Schroff 21100-719 Red Central Holders for PC Boards

SCHROFF SEM 315 POWER SUPPLY NEW BOXED INPUT 100-240VAC

Schroff LS5-6 120VAC, 5V 6A 30W DC Power Supply

SCHROFF Test Equipmet Handle - P/N 8082822520

Schroff Type PSK 105 Power Supply 230VAC In 5VDC Out #1

Schroff Type PSG 105 Power Supply 230VAC In 5VDC Out #1

Hoffman Schroff Computer Work Station Cabinet Mobile

SCHROFF CABINET/DOOR LOCK - 20220-123

Schroff Type PSK 215 Power Supply 230VAC In 15VDC Out#3

Schroff Type PSK 105 Power Supply 230VAC In 5VDC Out #3

Schroff Type PSK 112 Power Supply 230VAC In 12VDC Out#3

SCHROFF MAX 212 POWER SUPPLY NEW BOXED INPUT 100-240VAC

Schroff Type PSM 105 Power Supply 230VAC In 5VDC Out #3

Schroff LS 24-1.2 / 11008-613 POWER SUPPLY

Schroff Type PSK 215 Power Supply 230VAC In 15VDC Out#1

Hoffman Schroff Computer Work Station Cabinet Mobile

Schroff Type PSM 105 Power Supply 230VAC In 5VDC Out #5

Schroff Type PSK 105 Power Supply 230VAC In 5VDC Out #5

Schroff backpanel VME I/O System Bus 12 Slot 23000-212

Schroff Type PSM 105 Power Supply 230VAC In 5VDC Out #4

Schroff Type PSK 105 Power Supply 230VAC In 5VDC Out #4

Schroff Type PSM 105 Power Supply 230VAC In 5VDC Out #6

Schroff Type PSK 112 Power Supply 230VAC In 12VDC Out#1

Schroff 63961-008 Power Supply

Schroff Type PSK 215 Power Supply 230VAC In 15VDC Out#2

Schroff Type PSM 105 Power Supply 230VAC In 5VDC Out #1

Schroff Type PSK 105 Power Supply 230VAC In 5VDC Out #2

Schroff Type PSK 112 Power Supply 230VAC In 12VDC Out#2

Schroff Type PSG 105 Power Supply 230VAC In 5VDC Out #2

Schroff Type PSM 105 Power Supply 230VAC In 5VDC Out #2

Schroff Switchpac 30W TPS 12/2.5 11006-054 power supply

NEW in Box Schroff Testadapter #23021-606 Test Adapter
Expedited shipping available

Schroff 23000-012 12 Slot VME Systembus

SCHROFF 21596-132 FRU FIELD REPLACEABLE UNIT FAN TRAY

SCHROFF SEM 124 NO. 13100058

H# Ampere schroff OE-PMC111-1

H# Ampere Schroff OE-SMC111-1

Schroff 23000-015 15 Slot VME Systembus

H# Schroff OE-SBC002-2 & DT-SBC002-SMC-2

H# Schroff OE-CPU001-2