Murphy 2-1/2 in. Mechanical Differential Pressure Swichgage 0-100 PSI with Plated Steel Case - 25DP-100


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0.45 LBS
Estimated Special Order Ship Date:
Approximately 3 - 4 Weeks
Special Order Available:
Increments of 1

The Murphy Pressure Swichgage 25DP-100 is a diaphragm-actuated, differential pressure-indicating gage with a built-in electrical switch. This switch is used for tripping alarms and/or shutting down equipment. This gage is 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. It also features a polycarbonate, break-resistant lens and a polished, stainless steel bezel to help protect this rugged, built-to-last instrument. 

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.


  • Constant visual indication of the condition of your filter is shown on the dial
  • Two instruments in one with an accurate indicating gage and adjustable p.s.i.d. limit switch reduces inventory and installation time
  • 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
  • Made of durable materials allowing them to withstand rugged applications
  • 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
  • Enclosed in a steel case coated to resist corrosion
  • Gage pointer makes with an adjustable contact to complete a pilot-duty circuit


  • Murphy Part No.: 25DP-100
  • Series: 25DP Series
  • Base Model: 25DP
  • Range: 0-100 PSI (0-690 kPa/MPa) [0-7.0 bar]
  • Diameter: 2-1/2 in. / 64 mm., Dial
  • Dial: White on black, dual scale; U.S.A. standard scale is psi/kPa
  • Case: Plated Steel
  • Bezel: Polished Stainless Steel, Standard
  • 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
  • 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: 18 AWG (1.0 mm2) x 12 in. (305 mm)
  • Max. Static Pressure: 300 psi (2.1 kPa/MPa) [20 bar]
  • Max. Differential Pressure: 200 psi (1.4 kPa/MPa) [14 bar]
  • Contact Setting: 60 psi (414 kPa/MPa) [4.0 bar]
  • Unit Weight: 11 oz. (0.29 kg)
  • Unit Dimensions: 4-3/4 x 4-3/4 x 2-3/4 in. (121 x 121 x 70 mm)

Product Condition: NEW

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