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Sensors



Pressure, Speed/Time, Temperature and Vibration. Very important parameters to monitor and control.

FW Murphy offers pressure transmitters, pulsation dampeners, time and speed switches, magnetic pickups, thermocouples, shock-sensitive vibration mechanisms, and a configurable temperature scanner/pyrometer as remedies for more accurate indication and control of equipment.




Pressure Sensors & Instruments

 

 

PXT-K Series

 

The PXT-K Series pressure transmitters are state-of-the-art instruments providing 4-20 mA output. Each pressure transmitter contains a transducer comprised of a piezoresistive silicon chip mounted on a glass-metal feed-through header welded into a stainless steel housing and filled with silicone oil.

The enclosure and all wetted parts are made of 316L stainless steel to comply with NACE MR0175. This rugged instrument has an extremely small temperature error and class-leading EMI/RFI resistance, and can be used in applications such as compressors, engines, process control, liquid level and pumps.

 

   •  4-20 mA output signal

   •  Piezoresistive pressure transmitter

   •  Corrosion resistant construction

   •  High stablity

 

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PD8100 Series

 

The PD8100 Series eliminates pointer flutter on pressure indicating Swichgage® devices which are subject to pulsating pressure from reciprocating pumps or compressors. It decreases wear on geared movements and allows a close setting of high and low contact points, providing for more accurate pressure indication and control of equipment.

 

PD8100 SERIES IS NOT FOR USE ON OXYGEN OR LIQUID OXYGEN APPLICATIONS.

 

This series has a large diameter valve stem wheel for ease of adjustment and features clearly printed operating instructions. Available in brass, carbon steel, 303 stainless steel or 316 stainless steel to meet pressure and environmental requirements with either 1/2 NPT or 1/4 NPT inlet connections.

 

   •  Used on controllers, instruments and recorders to dampen pressure pulsation

   •  Eliminate gage pointer flutter

   •  Aids in providing more accurate pressure indication

   •  Decreases wear on a gage’s geared movement

 

Click here to see product specifications and current literature.

 

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Speed/Time Sensors & Instruments

 

 

5T, 15T, 12T, 24T Time Switches

 

Murphy Time Switches are designed for use in the oil field, irrigation systems or anywhere electrical motors, engines, or engine-driven equipment must operate or be controlled for a predetermined time.

Two versions are available: an hour switch for setting run time and shutdown of equipment; and a minute switch for short interruption of Swichgage® circuits on test or start up.

These time switches can be wired for an open or closed circuit when time expires. They require no electrical current to operate and have an SPDT contact arrangement.

 

   •  Spring wound, no electric power required

   •  Precision movement can be set to zero at any time

   •  Built-in stop prevents overwinding

 

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HD9063, OS77D, SS300

 

Murphy Electronic Speed Switches are available in various configurations to cover a wide variety of applications. These compact devices receive their input signal from various sources depending upon the particular speed switch model and application. They are available in single or dual switch point models, and the switch point(s) are field adjustable.

Models are available in self-contained enclosures and as PC-board design for inclusion in your control cabinet. All Murphy speed switches are designed to operate in harsh environments and have high electrical noise immunity.

 

   •  SS300 Series: Single set point speed switch with SPDT relay dry contact output.

   •  OS77D Series: Single set point speed sensing module with a transistor output.

   •  HD9063 Series: Dual set point speed switch in a PC board configuration and relay outputs.


Murphy speed switches applications include operating alarms and equipment shutdown. They are ideal for disconnecting starter cranking on auto start systems or overspeed switching.

 

 

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Magnetic Pickups

 

A magnetic pickup is an AC generator. It is normally installed into the flywheel housing of an internal combustion engine, so that the starter ring gear acts upon it to generate a voltage pulse each time a gear tooth passes the end of the sensor.

 

Available mag pickup models:

   •  MP3298    3 in.    (76 mm)

   •  MP7906    3 in.    (76 mm)

   •  MP7905    4-1/2 in.    (114 mm)

 

Click here to see product specifications and current literature.

 

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SHD30 / SHD30-45

 

These microprocessor-based tachometers feature an hourmeter and an overspeed trip point. The hourmeter is adjustable to a preset time and resettable to zero. The trip point can be connected as either a form C relay output or as a normally open SCR output for alarm or shutdown on overspeed.

The SHD30 models power and RPM data are supplied by either a magnetic pickup or a capacitor discharge (CD) ignition. Should power be lost, onboard batteries maintain the run hours display and allow for resetting the overspeed relay output.

 

   •  Normally open and normally closed overspeed alarm or shutdown switch (standard)

   •  RPM data and power supplied by magnetic pickup or capacitor discharge (cd) ignition

   •  Hours can be preset and reset to zero

   •  Approved for Class I, Division 2, Groups C & D hazardous areas

 

Click here to see product specifications and current literature.

 

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Temperature Sensors & Instruments

 

 

TDXM

 

The TDXM-DC now gives you a unique configurable temperature scanner/pyrometer with a built-in power supply. A new design features a 7-character Liquid Crystal Display window with easy-to-read characters. The instrument communicates with controllers, PLCs, computers or SCADA (RS485).

Additionally it has the selectable feature to monitor and alarm or shut down on deviation from an average for up to two groups of temperatures, and accepts any combination of “J” or “K” type grounded or ungrounded thermocouples.

 

 

   •  Scans up to 24 channels

   •  Three (3) adjustable trip points per channel

   •  Powered by 10 to 32 VDC systems

   •  CSA certified for use in Class I, Division 2, Groups “C & D” hazardous locations

 

Click here to see product specifications and current literature.

 

 

TC, RTD, and RTDT Series

 

Enovation Controls offers a variety of highly reliable thermocouple and RTD (Resistance Temperature Detector) assemblies, 4-20 mA DC output RTD transmitters, and a 304 stainless steel thermowell that provides protection to the spring-loaded element.

 

The complete assemblies are offered in 2-1/2, 4-1/2 or 7-1/2 in. (63, 114 or 191 mm) thermowell insertion lengths.

 

   •  304 Stainless Steel thermowell protection

   •  Compatible with digital Swichgage®

   •  Types “J” or “K” ungrounded thermocouples

   •  100 ohm, 3-wire RTD assemblies

   •  4-20 mA DC output RTD transmitters

 

Click here to see product specifications and current literature.

 

 

Thermocouple

 

The thermocouples are encased in a 1/4 inch diameter 316 stainless steel tubing sheath with stainless steel Bell Spring for strain relief, and are shipped straight but can be bent with standard tubing benders anywhere along its length to a 90° angle to minimize clearance required and help prevent damage due to personnel working on the unit.

Thermowells are available in 2-inch, 4-1/2 inch or 7-1/2 inch lengths for insertion depth and have a 1/2-inch NPT process connection. The Type K, 20 AWG stranded extension wire encased in a rugged industry-standard yellow Teflon, allows easy identification of K type thermocouple wires.

 

   •  Can be inserted directly into a low-pressure application process

   •  Type K, 6" and 10" probes

   •  The thermowell assembly comes with a stainless steel bore through compression fitting and ferrule

   •  Tip sensitive to minimize temperature influence from surrounding environment

 

Click here to see product specifications and current literature.

 

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MDTM89

 

Murphy’s model MDTM89 is an electronic, dual-temperature monitor. It monitors two thermocouples, displays the temperature of the thermocouple selected and has adjustable trip points for each input.

 

Two potentiometers, one on each side of the thermocouple selector switch, are provided for field adjustment of the trip points.

 

   •  FET or SCR output

   •  Power from CD ignition or 120 VAC or 12/24 VDC

   •  Types “J” or “K” ungrounded thermocouples

   •  Digital readings in Fahrenheit or Celsius

 

Click here to see product specifications and current literature.

 

 

TDX6®

 

The TDX6 is an advanced design six-point temperature scanner and pyrometer. It continually scans up to six thermocouples and sequentially displays the thermocouple number and its reading. Each sensor input has a field settable trip point for alarm, shutdown or control.

The TDX6 can interface with other Murphy Selectronic® Tattletale® annunciators and microcontrollers, and is rated for Class I, Division 2, Group D, hazardous areas.

 

 

   •  Scans six (6) channels

   •  J or K, grounded or ungrounded thermocouples

   •  Powered by CD ignition, 24 VDC, or 120 VAC

   •  Start-up time delay

   •  Easy to read digital display

 

Click here to see product specifications and current literature.

 


Vibration Sensors & Instruments

 

 

VS2 Series

 

The VS2 Series switches are shock-sensitive mechanisms for shutdown of engine or electric motor powered equipment. It is designed to detect shock/vibration in three planes of motion.

 

Ideal for use on engines, pumps, compressors, heat exchangers and pumping units, the VS2 Series can be used where shut-down protection from damaging shock/vibration is desired. Switches are field adjustable to the sensitivity required in each application.

 

 

   •  Includes magnetic latching feature

   •  Fully adjustable

   •  Manual or electric reset

   •  Explosion-proof models for hazardous locations available

 

Click here to see product specifications and current literature.

 

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VS94

 

VS94 Series is an electro-mechanical device designed to protect equipment from damaging shock or vibration. This sensitive mechanism can detect excessive shock or vibration and shut down the equipment before further damage occurs.

 

The VS94 Series is housed in a weatherproof NEMA 4/4X glass-filled polyester enclosure and has a base mount. It is rated up to 480 VAC with applications in non-hazardous locations.

 

 

   •  Detects shock or vibration in three (3) planes of motion

   •  Reliable magnetic latch feature

   •  Micro fine, easy-to-adjust sensitivity adjustment

   •  Manual Reset (standard); remote reset (optional); adjustable start-up time delay (optional)

 

Click here to see product specifications and current literature.