3S压力开关使用说明书

操作手册压力继电器（压力开关）YSJ-340系列一、概述YSJ-340系列压力继电器是一种超小型压力控制仪表，用于液压、气动系统的压力显示与控制，可替代德国贺德克HYDAC(贺德克)EDS300系列压力继电器。

该仪表采用了高精度压力传感器，电路部分以高性能单片机微处理器为核心，具有3位LED数字显示及轻触开关输入的人机界面、具有开关量（报警）输出及4～20mA模拟输出，是在机械继电器无法胜任的条件（如压力剧烈波动、强环境振动、高精度高速度控制、小体积等）下可靠工作的理想选择。

二、性能指标◇测量范围：0～1.6—0～60MPa◇电源电压：16～36VDC◇输出信号：（RL≤250Ω）◇接口螺纹：G1/4◇环境条件：环境温度：-20℃～60℃介质温度：:-20℃～80℃存储温度 :-40℃～125℃相对湿度：0～80%耐冲击：≤50g/ms耐振动：≤10g/（0～500HZ）◇输出信号精度：1.0◇过载压力：1.5%倍满量程压力◇最大功耗：≤3W触点容量：24VDC/1.2A（MAX）三、功能根据不同型号，装置可提供下列功能◇三位显示当前压力（正常工作）◇按压力、预设开关点输出开关量◇输出模拟量◇基本设定菜单◇提供四种不同输出模式：◇YSJ341带1路开关量输出（负载最大电流1.2A，无模拟量输出）◇YSJ342带2路开关量输出（负载最大电流1.2A，无模拟量输出）◇YSJ343带1路开关量输出（负载最大电流1.2A）和1路模拟量输出（4～20mA）◇YSJ344带2路开关量输出（负载最大电流1.2A）和1路模拟量输出（4～20mA）四、安装YSJ340可以通过压力管接头（DIN3852内螺纹G1/4），直接装在液压集成快上。

电气连接必须由国家认定合格的电工操作（参考中国电工国家标准规范）。

压力继电器的外壳必须同时良好的接地。

如安装在液压块里，块体通过液压系统接地时有保证的。

若用微型软管安装，客体必须单独接地。

3S压差控制器
用途:
3S系列压差控制器,通常用于水,油系列中控制供液管与回液管的压差控制,一
种典型的应用是,把阀门安装在系统水(油)泵附近的旁通管路中,当系列液管二端的压差升高(或降低)而超过控制器设定值时,则阀门进而开大(或关小),从而系统液管二端的压差减小,达到系统的正常运行.
概述:3S系列压差控制器的两侧各有一个具有高灵敏感度的感压元件,元件二端的压力一旦变化,即引起开关机构动作来控制系统的设备.
电器参数:
电流电压COSA．C．125/250无诱导电流112满载电流0.7512瞬时电流0.4572
性能参
数: Mpa 型号调节范围开关差工厂设定压差最大工作压力
MinMaxOFFONJC15C0.03—0.2≤0.030．050．021．70JC2C0.01—0.150.050．03 0．0151．70JC35C0.05—0.350.10．10．051．70JC60CH0.1-0.600.10．350．403．30 注:以上控制器的接头螺纹均为M12*1.25.如果客户需要英制螺纹则须在型号后加缀“E”即可.一般采用的英制螺纹为7/16”-20UNF，另有延时功能的型号后加缀T需订做。

触点形式:
1:公共接点1-3:压力上升时关闭1-5:压力下降时关闭
箭头表示压差增大时的动作方向安装注意: 1. 在安装控制器接管
时,不要把进出口端的方向搞错.在安装控制器接管时,控制器的螺母与接头必须用二把10”板手板紧.
青岛悦联 15:29:21
贴有标签HP的接头是接高压，另一头接低压。

S3控制器简易手册（信息来自模拟器）一，菜单名称与定义：1，P00（默认菜单）：显示空压机运行参数。

2，P01：标准设置菜单，用于更改常用空压机参数。

3，P02：故障历史记录查询。

4，P03：高级设置菜单，用于更改高级的空压机参数。

5，P04：工厂设置菜单，用于更改机组的工厂设置点。

6，P05：用于诊断和设置参数，检测模拟量的输入与输出。

7，P06：用于S3版本的升级与降级二，菜单密码：按“菜单键“后，进入密码提示栏，输入密码，按“上，下键”选择菜单，按“确认键“进入菜单。

1，P00不需要密码。

2，密码：0000，可进入：P00，PO1，P023，密码：0101，可进入：P00，P01，P02，P034，密码：1954，可进入：P00，P01，P02，P03，P045，密码：1594，可进入：P00，P01，P02，P03，P04，P05，P06备注：P00，P01，P02在开机状态下也可进入并修改。

P03，P04，P05，P06必须在停机状态下方可进入并修改。

只能将密码：0000告之客户。

三，P00菜单讲解：POO（默认菜单）：相当于SE控制的DISPLAY键。

按“向上/向下键“在各项间进行转换。

1，Ae:主机排气温度2，Rn:运行时间3，Ld:加载时间4，Mn:距离维护的时间（此时间会随运行时间的增加而减少，到零时即到保养时间）。

5，Mn:%距维护的期限（此百分比也会逐渐减小）。

四，P01菜单讲解：相当于SE控制器的SET中的前几项。

P01：用于更改空压机的基本常用参数1，Un:调节卸载压力（上限），调整范围：（5.2BAR-----额定压力+0.2BAR）2，Ld:调节加载压力（下限）,调整范围：（4.5BAR-----额定压力-0.4BAR）3，As:卸载运行到自动停车的时间（360S-3600S，0S可以设但不要设）。

4，Md:调节阀控制模式打开或关闭（ON/OFF），更改需要密码5，Eu:工程单位（度/BAR，度/KPA，度/PSI，华氏度/PSI）。

S-BSG-03-2B3A说明书
在遥控口使用遥控溢流阀DG-01产品，若遥控口管路的内部容积过大，易发生振动，故应该尽量减小管路内径和管路长度。

调整压力时，先松开锁紧螺母，顺时针旋转手轮，压力升高，反之压力降低，手轮每转一周，压力变化约5MPa，调定后，拧紧锁紧螺母。

压力调整会受到盐圈的限制，当达不到使用压力时，请拆下盛圈，每个垫圈月10MPa.
回油口管路不要与其他管路连接，应直接接回油箱。

小流量时，设定压力不稳定，公称尺寸为03，06时，使用流量应在5L/min以上，公称尺寸为10时，使用流量应在8L/min以上。

A3S/C室内压力监控器操作手册一、概述A3S/C系列室内压力监控器/变送器适用于对压力监控和报警有极高要求的微差压应用，它是一套完整的智能系统，包括LED显示，按键设置，声音报警，继电器输出。

二、工作原理该监控器/变送器内部由橡胶膜片分为一个高压腔和一个低压腔，当高压腔大压力高于低压腔时，橡胶膜片会向低压腔运动，带动机构产生一个微小位移，电子电路通过射频非接触位移测量技术来测量压差。

三、性能指标：精度：2%FS, (30-125Pa 4%FS )稳定性：±1%满量程/年温度范围：－10℃至50℃电源：17－35VDC电流：最大110mA继电器触点负载：0.5A 125V AC/1A 30VDC电气连接：接线端子压力连接：软管压力极限：100KPa四、结构及安装外观尺寸如下图：监控器是在垂直安装的条件下校准的，在使用时必须垂直安装。

表面安装方式：在直径为4 1/16"的圆上，钻3个大小相同且等距离的孔，与表背面的3个孔对应连接。

产品配件包里提供适用的3个固定用螺钉。

嵌入式安装方式：切下一个直径为4 9/16" 的圆，然后把表嵌入剩余部分的空隙中，并与适配器连接。

利用配件包中提供的6个螺钉将表固定在适当位置。

五、压力连接正压测量: 将压力管连接到表后面任意一个标有“high pressure”，即“高压”的孔，并堵塞另外一个高压孔。

把标有“low pressure”，即“低压”的两个孔暴露在大气中。

负压测量:把压力管连接到表背面任意一个标有“low pressure” ，即“低压”孔，并堵塞另外一个低压孔。

把标有“high pressure”，即“高压”的两个孔暴露在大气中。

差压测量: 把高压管连接到任意一个标有“high pressure”,即“高压”孔上，并堵塞另外一个高压孔。

把低压管连接到任意一个标有“low pressure”,即“低压”孔上，并堵塞另外一个低压孔。

压力控制器使用说明书
面板显示说明：
该表已根据要求将量程设成最好状态
只需要对报警进行设定就可以了
压力换算成显示值公式如下表：
显示值1个字表示0.001 mBar=1Pa
显示10个字就是0.01mBar=10Pa
显示100个字就是0.1mBar=100Pa
显示1000个字就是1mBar=1000Pa=1Kpa
具体的要看提供的压力控制要求来调整量程和报警控制
压力开关原理及工作电路
气体的压力经过压力传感器转换成电流信号通过压力控制器的主CPU处理后显示在控制控制器的PV屏上。

控制的压力值显示在SV屏上，控制压力可以根据实际环境的要求设定，实现全智能控制模式。

继电器带有常开/常闭触点，可以根据现场的要求进行状态设定，以满足现场的要求。

ZSE30/ISE30系列压力开关设定说明一、在测试模式下（即显示实际压力值的状态下）按住SET键2秒以上，进入初始设定。

完成初始设定需以下几个步骤：1、进入初始设定首先显示“显示颜色设定”的选定值，可通过△、▽键更改设定。

待选项有以下四种：、①Sor：ON时红（选择此项）②SoG：ON时绿③rEd：一直红④Grn：一直绿2、选好后按SET键保存并进入“动作模式设定”，共有两种动作模式：①HYS：迟滞模式（选择此项）②Ynd：上下限比较模式通过△、▽键可以任意选定3、选好后再次按SET键将进入“输出形态设定”，两种输出形态供选：①no：常开（选择此项）②nC：常闭两种输出形态通过△、▽键来选择4、选好后按SET键将进入“响应时间设定”，有四种响应时间，利用△、▽键可选：①2.5：2.5ms（选择此项）②20：20ms③160：160ms④640：640ms⑤1280：1280ms5、选好后按SET键将进入“自动预制设定”：①nAn：手动设置（选择此项）②AUt：自动设置通过△、▽键选定6、此时按再SET键将返回测试模式至此，初始设定完毕。

二、在测试模式下按一下SET键将进入手动数值设定界面。

此时[P_1]与设定值交替闪动。

如果想改变[P_1]的设定值可按△或▽键，此时数值末位闪动，按△或▽键可在0~9之间改变数值；按SET键上一位数值闪动，同样按△或▽键可在0~9之间改变此位数值，当更改好后，请不要按任何键等待十秒此数值将被设定成功。

此时[P_1]与设定值再次交替闪动。

如不想修改[P_1]的设定值或已修改好后按SET键进入固定迟滞的设定，此时[H]与固定迟滞的设定值交替闪动。

数值更改方法与上面介绍的修改[P_1]的设定值的方法相同，设定好后[H]与固定迟滞值交替闪动。

对[H]值未进行设定或设定好后再次按SET键则返回测试模式。

至此，手动数值设定完毕。

三、[P_1]与[H]的设定值在“HYS”迟滞模式中对压力开关信号输出的影响：若“输出形态设定”为“no”常开，当实际压力＞ [P_1]设定值时，压力开关输出on 信号；当on信号输出后，测试到的压力值若＞{[P_1]- [H]}，on信号被保持；随着压力的下降，当实际压力＜{[P_1]- [H]}时压力开关输出信号变为off。

汽车空调用三态压力开关技术规范-标准化文件发布号：（9456-EUATWK-MWUB-WUNN-INNUL-DDQTY-KII1 范围本标准规定了汽车空调三态压力开关技术要求、试验方法、检验规则、标志、包装、运输及贮存要求。

本标准适用于公司现有产品用三态压力开关的选用和验收。

2 引用标准无3技术要求3.1 一般要求压力开关应按本技术条件的规定，并按经规定程序批准的图样及技术文件制造。

3.2外观及外形尺寸3.2.1 产品外表要求光洁，部件无损坏，铭牌清晰，插片无毛刺。

3.2.2 外形尺寸应符合图纸要求。

3.3 工作压力H/P：OFF 3.14±0.2MPa DIFF 0.59±0.2MPaM/P：OFF 1.37±0.10MPa ON 1.77±0.10Mpa或根据具体空调系统确定。

L/P：OFF 0.196±0.02MPa DIFF 0.023±0.01MPa3.4 气密性按4.5方法试验，向开关加压3.5MPa，开关的任何部位应无气体渗漏。

3.5 静压强度按4.6方法试验，在5.3MPa的压力下保持5min，开关不应出现任何异常，工作压力应满足3.3条要求。

3.6 爆破压力按4.7方法试验，在8.0MPa压力下开关不应出现爆破。

3.7 绝缘强度按4.8方法试验，在插片之间施加500V，插片与外壳之间施加500V的交流电压，保持1min，开关不应出现击穿和闪络现象。

3.8 电压降按4.9方法试验，开关的电压降插片1与2之间不应大于200mV，插片3与4之间不应大于100mv。

3.9 耐过载电流按4.10方法试验，开关应符合要求。

3.10 撞击试验按4.11方法试验后，开关不应出现任何破损现象，并符合3.3，3.4要求。

3.11 振动试验按4.12方法试验后，开关不应出现任何破损现象，并符合3.3，3.4要求。

3.12 耐久性试验按4.13方法试验后，开关应符合3.3，3.4要求。

智能消防压力开关使用操作指南一、概述智能消防压力开关是集压力测量、显示、输出控制于一体的智能压力测控产品。

该产品采用进口陶瓷压阻式压力传感器，经高精度的A/D 转换，配合高精度微处理器运算处理，可现场显示，并输出开关量信号。

智能消防压力开关使用灵活、操作简单、调试容易、安全可靠。

广泛应用于消防、水务、石油、化工、机械等行业。

二、技术参数显示方式：数码显示，具有显示可靠、显示时间长、高亮度等特点。

量程范围：0-1.6MPa （其他量程可定制）精度等级：0.2%、0.5%可选过载能力：最大量程的1.5倍压力类型：表压供电电源：直流24V 、交流220V 可选响应时间：≤25ms输出方式：有源或无源输出可选三、电气连接示意图及安装示意图图3-1，电气连接示意图图3-2，安装示意图1、电气接线前请检查确认为直流24V 供电，正确接到压力开关的电源线上。

控制线接到压力开关的控制线。

接错将导致压力开关烧坏或表内输出继电器烧坏。

2、安装压力开关时，若安装位置水温超过60度，或者安装在管道的阀门附近，或者水泵附近时，为避免高温、水锤效应、振动等因素导致压力开关的损坏，请务必安装缓冲管。

四、设置方法压力低于0.3MPa 电机启动，高于0.6MPa 电机停止，具体设定步骤如下：按压“SET ”设置键一下，显示屏左下方显示“-”（如图4-1，下限设置状态），且显示屏最后一位数闪烁，此时按“－”键和“＋”键配合把数值调整为0.3MPa 。

再按压一下“SET ”设置键，显示屏左上方显示“-”（如图4-2，上限设置状态），且显示屏最后一位数闪烁，按“－”键“＋”键配合调整上限压力为0.6MPa ，再按压“SET ”键进行保存，最后再按“SET ”键退出设定状态。

设定完成后按“运行/停止”键，屏幕左侧显示“r ”（如图4-3，运行状态）。

此时压力开关开始根据设定的压力自动控制电机或水泵的启动和停止。

注：因各地大气压有所不同，如在无压力情况下出现显示值不归零，可以长按清零键归零（如图4-4，清零状态）。

14Features:• Set point repeatability, +1% of operating range.• All wiring terminals, adjustments and visual scales are accessible from the front of the switch.• Choice of general purpose, watertight or explosion-proof enclosures.• Choice of fixed or full-range adjustable deadband.• Choice of single or two-stage units.• Manual reset units available.• Mounts in any position.• Rugged and vibration resistant.• Visual adjustment scales in psi and bars.• External adjusting nuts.• Separate electrical, pressure and adjusting chambers.• Wide selection of transducer wetted materials suitable for air, water, oil or corrosive fluids.• Mix and match switch and transducer components for increased stock flexibility or to change pressure ranges in field.General Description:ASCO S-Series pressure switches consist of a switch unit and a transducer unit.They can be orderedseparately for customer stocking and/or field assembly or as a complete factory-assembled unit.SwitchS-Series pressure switch units incorporate the unique ASCO TRI-POINT alternating fulcrum balance plate to control the operation of one or more electrical snap-action swtiches.The electrical snap-action switchtogether with the adjusting mechanism is a fully-tested,self-contained subassembly.TransducerT ransducer unit incorporates a diaphragm/piston type pressure sensor, and is also a fully-tested, self-contained subassembly.OperationWhen pressure is applied to the transducer it is converted into movement of the piston.This pistonmovement is then used to control the operation of the electrical snap-action switch in the switch unit.Standard Electrical RatingsSwitches for Pressure to 8000 psig, Vacuum, or Differential with General Purpose, Watertight or Explosion-Proof EnclosuresStandard Temperature RatingsOptions (See pages 34-35)EnclosuresASCO TRI-POINT S-Series switches are available in three standard enclosures.All of these enclosed units are made in accordance with NEMA and UL standards. General Purpose–Type 1.These enclosures are designed for indoor use to protect personnel from accidental contact with the equipment.S-Series general purpose switch units consist of a copper-free* aluminum die-cast body with a formed copper-free* aluminum cover;two 3/4”conduit hubs with one plug are provided.Watertight–T ype 4.Watertight and dust-tight enclo-sures are intended for use indoors and outdoors to protect the enclosed equipment against splashing or falling water, windblown dust and water, hose directed water, and severe external condensation.S-Series watertight switch units have a copper-free* aluminum die-cast body and a formed copper-free* aluminum cover with Buna “N”gaskets;two 3/4”conduit hubs with one plug are provided.Explosion-Proof–T ypes 7 and 9.T ype 7 enclosures are intended for use in locations defined by the National Electrical Code as Class I.T ype 9 enclosures are intended for Class II locations.Class I locations are those in which flammable gases are or may be present in the air in sufficient quantities to produce explosive or ignitable mixtures.Class I loca-tions are classified by group letter, which defines partic-ular atmospheres.Division 1 locations are areas where the hazardous concentration exists continuously, inter-mittently or periodically under normal operating condi-tions.Division 2 locations are those where the haz-ardous vapors are present only in case of accidental rupture or breakdown of equipment.ASCO TRI-POINT explosion-proof enclosures with letter B, C or D in the fifth position are listed for Class I, Groups B, C, and D, Division 1.They are also suitable for the less stringent Division 2 environment.Class II locations are those which are hazardous because of the presence of combustible dust.All ASCO TRI-POINT explosion-proof enclosures are listed for Groups E, F, and G locations.The switch body and cover are die-cast copper-free* aluminum with a Buna “N”gasket.T wo 3/4”conduit hubs with one plug are provided.Dimensions (inches)* Less than 0.6% copper.1516the maximumrange of the switch .1231718the maximum1934H-Series, P-Series and S-Series Snap-Action Switch OptionsOptional snap-action switches to meet specific electrical loads or application conditions are available on most ASCO TRI-POINT switch units. Generally, the construction of a switch unit with optional snap-action switches contains other specific parts and may be ordered only as a factory-built unit. To specify a particular optional construction, add the appropriate suffix to the switch unit action switch (suffix “P ”P-SeriesSwitch OptionsPanel Mount –Open frame P-Series compact switch units areavailable for panel mounting with the switch unit inside and the transducer outside. The panel separates the fluid sensing portion from the electromechanical portion. Five holes for bolts and operating stem must be drilled or punched through the panel.Three constructions are available: add the suffix listed below to the switch unit catalog number for the desired thickness.S-SeriesSwitch OptionsIndustrial Adjusting Nut Covers –Available in clear plastic or metal to prevent tampering with set point adjusting nuts.Clear plastic cover:To order, add suffix “1” to the switch unit catalog number, or order separately as SP01.Metal cover:To order, add suffix “2” to the switch unit catalog number, or order separately as SP02.JIC Construction –A switch unit having the electrical and adjusting nut covers attached to the switch body by a chain. Also designed to Type 13specifications. To order, add suffix “3”to the switch unit catalog number, or order separately as SP03.Terminal Block –Applicable to switch units with one single-poledouble-throw switch. The terminal strip is prewired to the snap-action switch. To order, add suffix “4” to the switch unit catalog number, or order separately as SP04.Factory Sealed –Explosion-proof units may be ordered with a factory seal separating the electrical chamber from the conduit hubs and 24” long #14 AWG 105°C. rated lead wires. To order, change the fourth digit of the “3”35Pressure Transducer OptionsP-Series and S-Series Temperature Transducer OptionsSpecial Wetted Materials –The following diaphragms maybe substituted on transducer body materials of aluminum,brass, polyester and stainless steel. To order, substitute the Oxygen Cleaning –Pressure transducers for oxygen serviceshould be specially cleaned. They are degreased and blacklight inspected, then assembled in a clean area and tested with oil-free air or nitrogen. Use metal body transducer with viton or neoprene diaphragm and add suffix “H ”Pressure Snubbers –A pressure snubber (1/4” NPTF by1/4” NPTM) installed in the transducer pressure connection will dampen the pressure spikes to a value which will not cause damage. It consists of a body with a porous metal disc of stainless steel through which the fluid passes. To order,select a snubber compatible with the fluid. Available by seperate catalog number only (see table below).Process Connection –A female process connection (1/4”NPT) is standard on all pressure transducers. A 1/2” NPT is available as an option on gauge pressure transducers. To order, add suffix “B ”Note: Armored Capillaries –Double braided copper armor isstandard for copper capillary units. Stainless steel spiral interlocked armor is available for stainless steel capillary units. Add suffix “C ” to transducer catalog number.Thermal Well –Use with direct or remote sensors forprotecting sensing bulb. This allows removal of bulb while maintaining a pressure-tight vessel. Available in 1/2” NPT or 3/4”NPT process connection in brass or 316 SS. Dimensions are in accordance with SAMA Std. RC17-9. Standard “U ” dimension (insertion length) is 2-1/2” for direct mount and 6’capillary units and is 4-1/2” for 12’capillary units.Longer Capillaries –Standard copper and stainless steelcapillary units can be furnished in 12’lengths. To order, add suffix “D ” to transducer catalog number. Consult ASCO for longer length capillaries.Union Connector –For use with remote units for mountingof bulb in fluid being controlled. Available in 1/2” NPT and 3/4” NPT process connections in brass or 316 SS.Thermal WellJam nuts provided with thermal wells.11Switch Unit – ASCO uses the term “switch unit ” to describe the electromechanical portion of a pressure or temperature switch. This is used in conjunction with a transducer unit to form a complete pressure or temperature switch.Transducer Unit – ASCO uses the term “transducer unit ” to describe that portion of a pressure or temperature switch to which a pressure or temperature is applied which converts the input signal to another form of energy to operate the switch unit.Two-Stage (Dual)– ASCO uses the term “two stage ” todescribe a pressure or temperature switch which is equivalent to two pressure or temperature switches which are independently adjustable. This switch is equivalent to two fixed deadband switches.Deadbands – The deadband is the difference between the set point and reset point readings. Deadbands are listed in the specification tables at nominal values. They are representative of the deadbands of the units at the middle of the range.The deadband values for the full range adjustable deadband switches and limited adjustable deadband switches indicate the values through which the deadband may be adjusted.Generally, as the set point is adjusted through the operating range, the deadband will vary. Normally, it will becomenarrower as the set point is towards the bottom of the range,and will become wider when the set point is towards the top of the range. The graph shown below indicates representative trends of this type of deadband variation.Temperature switch deadbands are a result of the characteris-tics of the vapor pressure curve as well as other factors.Normally, this results in a deadband which is narrower in the top third of the range than in the bottom third of the range.The values published are nominal and representative of mid-range set points.36Accuracy – The maximum deviation from the set point under specified operating condition (ambient temperature,barometric pressure, etc.).Adjustable Deadband – Refers to the capability of apressure or temperature switch to allow the deadband to be adjusted over a given range. Certain ASCO TRI-POINT switches have an adjustable deadband which can be adjusted over the total operating range of the switch.Adjustable Operating Range – The pressure or tempera-ture range of the switch within which the set point may be adjusted.Differential Pressure – The difference between twopressures. A differential pressure switch senses two pressure sources and can be adjusted to actuate on a desired difference between them.Guage Pressure – The actual reading of a typical pressure guage and is the difference between the pressure within a vessel and the atmospheric pressure surrounding it. It is normally measured in pounds per square inch (psig).Manual Reset – The switch is a semi-automatic device which operates automatically with a signal change in one direction but must be manually reset once the signal returns to its original position.Proof Pressure – A pressure which a device can besubjected to for extended periods of time without changes in its operating characteristics.Rated Overrange Temperature – A temperature which a device can be subjected to for extended periods of time without changes in its operating characteristics.Repeatability – The closeness of agreement among a number of consecutive measurements of the output for the same value of input under the same operating conditions approaching from the same direction. Repeatability isnormally specified as a percentage of the upper limit of the operating range.Example: Operating range 5-100 psig with +1%repeatability; equals +1% of 100 psig or +1 psig.Reset Point – After a pressure or temperature switch has reached its set point and operated the electrical switch, it must return to a point called the reset point before the electrical switch can return to its original position.Set Point – The pressure reading at which the electrical switch element changes contact position (it can be specified either increasing or decreasing).DefinitionsDeadbands1.5 x Catalog Value Catalog Value Half Catalog ValueBottom Mid TopPosition of Set Point in Range37These recommendations are to be used as a guide only, as service life of material is dependent on temperature, concentrations, or catalysts that may be added and other conditions which are beyond our control.Consult ASCO for specific service applications.Note:Items in black circles are standard catalog units.All others available on factory order.P - Indicates preferred construction. S - Indicates satisfactory construction.Transducer Material Code of Two Digits represents process connection material and diaphragm material, respectively; these are the sixth and seventh positions of the pressure transducer catalog number.Process Connection: 6th Position Diaphragm: 7th Position 1 Aluminum 4 316 S.S. 1 Buna “N ” 4 316 S.S.2 Brass 7 Nylon/Brass2 Viton6 Ethylene Propylene 3 303 S.S.3 Neoprene7 FluorosiliconeFluid Compatibility GuideFor high purity applications use stainless steel transducers.Notes:1Oxygen service requires special cleaning, specify suffix “H ”.2For steam service a condensate loop (pigtail) is required.3For pressure transducers for combustion service see pages 20-23.4Material availability refers to standard gauge pressure constructions only.5。