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MURPHY A20P / A25P Series Mechanical Pressure Swichgage
Murphy A20P和A25P系列直感式压力表
A20系列（2英寸/ 51毫米刻度盘）和A25系列（2-1 / 2英寸/ 64毫米刻度盘）是隔膜驱动的压力指示计，带有内置的电子开关，用于触发警报和/或关闭设备。范围从0-15 psi（103 kPa）[1.0 bar]到0-400 psi（2.8 MPa）[28 bar]。
Swichgage 工具是建立在美国和保护了发动机和设备的应用，如石油和天然气，船舶，水利，建筑和货运应用程序来监视发动机润滑油压力，水泵压力，水压，气压，以及可实现更超过80年。
MURPHY A20系列（2英寸/51mm刻度盘）和A25系列（2-1/2英寸/64mm刻度盘）开关仪表为隔膜驱动压力指示仪表，带有用于跳闸报警和/或停机装置的内置电气开关。
A20P / A25P Series | FW Murphy Production Controls
A20 / A25P Series Pressure Swichgage | Murphy by Enovation Controls
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表盘 ：黑底白字，双重美国/英国标准刻度（美国标准刻度为psi / kPa；英国标准刻度为psi / bar）
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外壳 ：聚碳酸酯/玻璃纤维填充，耐腐蚀； 随附钢制安装夹
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挡板： 抛光不锈钢，标准； 其他可用
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镜片： 聚碳酸酯纤维，耐冲击
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指针： 钢化镍银
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油： 硅油
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环境温度范围： -40°F（-40°C）至150°F（66°C）
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过程连接 ：1 / 8-27 NPTM黄铜。
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传感元件 ：铍铜膜片。
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量具精度 ：请参见下载公告
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最大压力： 请参阅下载中的公告
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可调限位触点（A20P和A25P） ：SPST触点； 仅限飞行员，2A @ 30 VAC / DC; 达到下限时关闭。 当指针处于正常操作范围内时打开。 触点是闪金的银。
- 限位触点调整： 用1/16英寸六角扳手穿过刻度尺的100％。
- 接线： A20P：4号螺钉端子； A25P：6号螺丝端子
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快动开关额定 SPDT，3 A @ 30 VDC感性; 4 A @ 125 VAC感性
- 接线： A20PE：4号螺丝端子； A25PE：6号螺丝端子
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单位重量 ：A20系列：8盎司。 （0.23公斤）； A25系列型号：11盎司。 （0.31公斤）。
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装置尺寸： A20系列：8盎司。 （0.23公斤）； A25系列型号：11盎司。 （0.31公斤）。
这些坚固耐用的仪器通过聚碳酸酯外壳和镜头，抛光不锈钢表圈和O形圈密封件的独特结合，与周围环境隔绝。 高于30 psi（207 kPa）[2 bar]的范围与外界环境隔离（PE系列除外）。 30 psi以下的压力范围在外壳底部有一个小漏液孔。 独特的整体式隔膜腔确保了精度和适度超压保护。 内置的脉动阻尼器有助于消除指针抖动，并且可拆卸进行清洁。
A20P和A25P系列Swichgage
指针带有可调节的限位触点，以完成先导工作回路。 触点具有自清洁功能，可确保电气连续性。
A20PE （原为A20EO） 和A25PE （原为A25EO） 交换
功能具有内部 速 动SPDT开关，而不是单极/指针触点，可进行三线控制，并且可以进行布线以接通或断开电路。 当开关在下降压力下闭合时，它会随着压力的升高而置位，开关会复位（请参阅接线图）。
- A25PE型已通过CSA认证，适用于非危险区域。
- 型号A25PE-EX已通过CSA认证，属于I类，1区，C和D组危险区域。
A20PABS和A25PABS压力仪表
与A20P和A25P相同，带有内部SPDT快动开关，可进行预警
A20PG和A25PG MurphyGage仪器，仅限仪表，
无开关触点。
Part Number Description Notes
| 05702176 |
A20 Series Clamp Lite Assembly; 12V |
Illumination — Order Separately |
| 05702177 |
A20 Series Clamp Lite Assembly; 24V |
Illumination — Order Separately |
压力SWICHGAGE开关表A20P和A25P系列
- 2英寸和2.5英寸（51mm和64mm）
- 外壳材质：聚碳酸酯外壳，抗腐蚀 Polycarbonate Case
- 压力量程达400PSI (2,76MPa)(27.60bar)
- 表面可调低限触点
MURPHY A20 Series (2 inch/51 mm dial) and the A25 Series (2-1/2 inch/64 mm dial) Swichgage instruments are diaphragm-actuated, pressure-indicating gages with built-in electrical switches for tripping alarms and/or shutdown devices.
Ranges are available from 0-15 psi (103 kPa) [1.0 bar] through 0-400 psi (2.8 MPa) [28 bar].
These rugged, built-to-last instruments are face sealed from the environment by the unique combination of a polycarbonate case and lens, a polished stainless steel bezel and O-ring seals. Ranges above 30 psi (207 kPa) [2 bar] are sealed from the external environment (except PE Series). Ranges of 30 psi and lower have a small weep hole in the bottom of the case. Accuracy and protection from moderate overpressure is assured by a unique, unitized diaphragm chamber. A built-in pulsation dampener helps eliminate pointer flutter and is removable for cleaning.
For series A20P and A25P, the gage pointer acts as a pressure indicator and as one switch pole which completes a circuit when it touches the adjustable limit contact. Contacts have self-cleaning motion to ensure electrical continuity.
Models A20PE and A25PE have internal snap-acting SPDT switches for three wire control and can be wired to make or to break a circuit.
Gage-only models, without switches (Murphygage instrument) are also available.
A20/A25 Series applications include: engines/equipment in oil field, marine, irrigation, construction and trucking for lube oil pressure, water pump pressure, hydraulic pressure, air pressure, etc.
Base Models
A20P and A25P Series Swichgage
The gage pointer makes with an adjustable contact to complete a pilot duty circuit.
A20PE and A25PE Swichgage
A20PE (was A20EO) and A25PE (was A25EO). Features internal snap-acting SPDT switches, instead of the single pole/pointer contacts. When the switch closes on falling pressure, it becomes set, as pressure rises the switch resets (refer to wiring diagram).
Model A25PE is CSA listed for non-hazardous areas.
Model A25PE-EX is CSA listed for Class I, Division 1, Groups C and D hazardous areas.
A20PABS and A25PABS Swichgage instrument
Same as A20P and A25P with internal SPDT snap-switch for pre-alarm
A20PG and A25PG Murphygage instrument
Gage without contact(s)
Specifications
Dial : White on black, dual scale; U.S.A. standard scale is psi/kPa; U.K. standard scale is psi/bar.
Case : Polycarbonate/glass filled, corrosion-resistant; steel mounting clamp included
Bezel : Polished stainless steel, standard; others are available.
Pointer: Tempered nickel silver; Red tip.
Lens: Polycarbonate, high-impact.
Oil: Silicon Oil.
Temperature Range:
- Ambient: -40°F (-40°C) thru 150°F (66°C).
- Process: -40°F (-40°C) thru 250°F (121°C).
Process Connection: 1/8-27 NPTM brass.
Sensing Element: Beryllium copper diaphragm.
Gage Accuracy (% of Full Scale):
| RANGE |
LOWER 1/4 |
MIDDLE 1/2 |
UPPER 1/4 |
| =300 psi (20 Bar) |
±3% |
±2% |
±3% |
| 400 psi (28 Bar) |
±3% |
±3% |
±5% |
Maximum Pressure: See Pressure Ranges and Factory Settings table.
Adjustable Limit Contact (A20P and A25P): SPST contact; pilot-duty only, 2A@30 VAC/DC; Closed when the low limit is met. Open when pointer is in normal operating range. Contacts are gold flashed silver. Limit Contact Adjustment: by a 1/16 in. hex wrench through 100% of the scale.
Wiring: A20P: Number 4 screw terminals; A25P: Number 6 screw terminals
Snap-Switch Rating (A20PE and A25PE): SPDT, 3 A@ 30 VDC inductive; 4 A @ 125 VAC inductive
Wiring: A20PE: Number 4 screw terminals; A25PE: Number 6 screw terminals.
Unit Weight: A20 Series: 8 oz. (0.23 kg); A25 Series Models: 11 oz. (0.31 kg).
Unit Dimensions: A20 Series: 3 x 3 x 3 in. (76 x 76 x 76 mm); A25 Series Models: 4-3/4 x 4-3/4 x 2-3/4 in. (121 x 121 x 70 mm)
- 产品技术资料下载For more information about this product, you can download the related literature here:
A20PE和A25PE系列型
-除带微动开关与20P/25P类似
-工厂设定开关点
-A25PE和A25PE系列型
-除带微动开关外与20P/25P类似
-工厂设定开关点
-A25PE是CBS标准标定的非危险场地使用的
-A25PE-EX是CSA标准标定的用于Class I，Div.1
Group C&D的危险场地
Murphy A20 Series Pressure Swichgages- A25 Series Pressure & Vacuum Swichgages
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A20P-50 (05704515): 2" Pressure Swichgage with Polycarbonate Case
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A20P-75 (05704254): 2" Pressure Swichgage with Polycarbonate Case |
A20P-100 (05704255): 2" Pressure Swichgage with Polycarbonate Case |
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A20P-150 (05704256): 2" Pressure Swichgage with Polycarbonate Case
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A20P-200 (05704257): 2" Pressure Swichgage with Polycarbonate Case |
A20P-300 (05704258): 2" Pressure Swichgage with Polycarbonate Case |
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| A20P-400 (05702525): 2" Pressure Swichgage with Polycarbonate Case |
A25P-100 (05704337): 2.5" Pressure Swichgage with Polycarbonate Case |
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Murphy A20 Series Pressure Swichgages
A20P-50 (05704515): 2" Pressure Swichgage with Polycarbonate Case
A20P-75 (05704254): 2" Pressure Swichgage with Polycarbonate Case
A20P-100 (05704255): 2" Pressure Swichgage with Polycarbonate Case
A20P-150 (05704256): 2" Pressure Swichgage with Polycarbonate Case
A20P-200 (05704257): 2" Pressure Swichgage with Polycarbonate Case
A20P-300 (05704258): 2" Pressure Swichgage with Polycarbonate Case
A20P-400 (05702525): 2" Pressure Swichgage with Polycarbonate Case
Murphy A25 Series Pressure & Vacuum Swichgages
A25P-100 (05704337): 2.5" Pressure Swichgage with Polycarbonate Case
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