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MURPHY 20DP / 25DP / A20DP / A25DP Mechanical Pressure Gauges
Murphy 20DP Differential Pressure Swichgages压差表
MURPHY 20DP和A20DP系列（2英寸/51毫米刻度盘）和25DP和A25DP系列（2-1/2英寸/64毫米刻度盘）开关仪表是隔膜驱动的，带有内置电气开关的压差指示仪表。该开关用于跳闸报警和/或关闭设备。这些仪表用于监测和指示机油、燃油或水滤清器阻塞，并可降低危险高压的风险，该高压可能导致滤清器破裂，从而导致污染物进入系统。MURPHY 20DP and A20DP Series (2 inch/51 mm dial) and the 25DP and A25DP Series (2-1/2 inch/64 mm dial) Swichgage instruments are diaphragm-actuated, differential pressure-indicating gages with a built-in electrical switch. This switch is used for tripping alarms and/or shutting down equipment. These gages are intended to monitor and indicate oil, fuel or water filter restriction and can reduce the risk of dangerously high pressure which may rupture the filter, resulting in contaminants entering the system.
规格参数：
- 20DP / 25DP系列压差式SWICHGAGE压力开关表
- A20DP / A25DP系列压差式SWICHGAGE压力开关表
- 2英寸和2.5英寸（51mm和64mm）
- 表面可调节高触点
- 适用于机油、燃油和水滤清器阻力测定
The 20DP and 25DP series mechanism is enclosed in a steel case coated to resist corrosion. The A20DP and A25DP series have a polycarbonate case and are sealed from the environment. All feature a polycarbonate, break-resistant lens and a polished, stainless steel bezel to help protect these rugged, built-to-last instruments.
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.
Additional features:
- Constant visual indication of the condition of your filter is shown on the dial.
刻度盘上不断显示过滤器的状况。
- Two instruments in one with an accurate indicating gage and adjustable p.s.i.d. limit switch reduces inventory and installation time.
两个仪表为一体，配有精确的指示仪表和可调p.s.i.d.限位开关，减少了库存和安装时间。
- Adjustable contact lets you set the monitoring range of the gage. The contact is tamper proof and can be set only with a 1/16 Allen-head wrench.
可调触点允许您设置仪表的监控范围。触点是防篡改的，只能用1/16内六角扳手设置。
- All gages are made of durable materials allowing them to withstand rugged applications.
所有的量具都是由耐用的材料制成的，使它们能够经受坚固的应用。
- Early filter changes cost you money and increase the risk of contaminants entering the system. A Murphy filter restriction Swichgage instrument will let you know when to change the filter and maintain peak efficiency.
早期更换过滤器会让你花钱，增加污染物进入系统的风险。墨菲过滤器限制开关仪表将让您知道何时更换过滤器和保持峰值效率
Base Models
20DP, 25DP, A20DP and A25DP Swichgage instrument
The gage pointer makes with an adjustable contact to complete a pilot-duty circuit.
20DPE, 25DPE, A20DPE and A25DPE Swichgage instrument
20DPE (was 20DPEO), 25DPE (was 25DPEO), A20DPE (was A20DPEO) and A25DPE (was A25DPEO).
Features an internal snap-acting SPDT switch, instead of the single pole/pointer contacts. When the switch closes on rising pressure, it becomes set, as pressure falls the switch resets. 20DPG, 25DPG, A20DPG and A25DPG Murphygage instrument gage without contact(s).
Specifications
Dial : White on black, dual scale; U.S.A. standard scale is psi/kPa. Other scales available
Case : 20DP and 25DP Series: plated steel. A20DP and A25DP Series: polycarbonate
Bezel : Polished stainless steel, standard; others are available.
Lens : Polycarbonate, high-impact
Temperature Range :
- Ambient: -40° to 150° F (-40° to 66° C)
- Process: -40° to 250° F (-40° to 121° C)
Process Connection : 1/8-27 NPTM brass
Sensing Element : Beryllium copper diaphragm
Gage Accuracy : ±3% maximum across scale
Snap-Switch Rating (DPE models) : SPDT, 3 A @ 30 VDC inductive; 4 A @ 125 VAC inductive
Adjustable Limit Contact : SPST contact; pilot duty only, 2 A @ 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 1/16 in. hex wrench through 100% of scale.
- Limit Contact Wire Leads (20DP and 25DP Series): 18 AWG (1.0 mm2) x 12 in. (305 mm)
- Limit Contact Terminals: A20DP Series #4 screw terminals. A25DP Series #6 screw terminals
Unit Weight : 20DP and A20DP Series: 9 oz. (0.25 kg); 25DP and A25DP Series: 11 oz. (0.29 kg)
Unit Dimensions :
- 20DP and A20DP Series: 3 x 2-3/4 x 2-3/4 in. (76 x 70 x 70 mm).
- 25DP and A25DP Series: 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:
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20DP-15 (05700386): Differential Pressure Swichgage
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20DP-30 (05700387): Differential Pressure Swichgage |
25DP-30 (05700335): Differential Pressure Swichgage |
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A20DP-30 (05700405): Differential Pressure Swichgage with Polycarbonate Case
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A25DP-30 (05700350): Differential Pressure Swichgage with Polycarbonate Cas |
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Murphy 20DP Differential Pressure Swichgages压差表
A25DP-30 Differential Pressure Swichgage
20DP-15 (05700386): Differential Pressure Swichgage
20DP-30 (05700387): Differential Pressure Swichgage
25DP-30 (05700335): Differential Pressure Swichgage
A20DP-30 (05700405): Differential Pressure Swichgage with Polycarbonate Case
A25DP-30 (05700350): Differential Pressure Swichgage with Polycarbonate Case
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