Watson Smith I/P Converters and Manostats

High Stability
Low Maintenance
Wide range of air supply options
Intrinsically safe versions available

The Watson Smith family of current to pressure(I/P) , Voltage to pressure (E/P) and precision regulators has led the way in technology in converting 4-20mA and 0-10V electrical signals to pneumatic signals of 0.2 to 1.0 bar and 3 to 15 psi. These devices are mainly used as the final electronic element in many control loops.

100X for reliability at Low Cost
140 for Hazardous area compatibility
Manostats for precision regulators

Electronic I/P Converters Type 422 Standard models currently in stock! All electronic I/P converters have closed loop control, excellent vibration resistance, long term stability and can be mounted in any orientation. 4-20mA signal and a range of output variations. Type 422 Freeze fail I/P converter 3-15psi, 3-120psi, 0.2-1bar, 0.2-8bar output options High Flow - 280 l/min (10scfm) Faifreeze drift rate < 2% setpoint/hour IP65 rating Type N or Intrinsically Safe options For price and delivery, please contact us !
Electro Mechanical I/P and E/P Converters Type 100X Standard models currently in stock! Rugged and reliable force balance converters for use in both process control and industrial applications. Type 100X Type 101X - Electro Mechanical E/P & I/P 4-20mA, 0-10V; 0-60mA signal options Pressure ranges from 3-15psig (0.2-1bar) to 3-120psig (0.2-8bar) Two wire or three wire versions (12/24V) High Flow - 280l/min (10scfm) Weatherproof to IP65 Intrinsically safe versions available
Electronic I/P Converter Type 140 Standard models currently in stock! Type 140 I/P Electronic Converter (Failsafe) Robust, explosion-proof pressure converter with Triple Certification and IP66 & NEMA 4X weatherproofing. With ExN Certification. For price and delivery, please contact us !
P / I Converters Type 68 P/I Converters This instrument convert pneumatic pressure into electrical signals for use with data loggers, computers and microprocessors. The Type 68 is a two wire pressure/current device. This use only non-critical power supplies. » 4-20mA, 0-10V output » Wide range of input pressures » DIN rail mounting » Intrinsically safe option List of available models: 680100, 680110, 68043X, 68066X, 681500, 681510, 68151X, 682100, 682110, 683300, 683350, 683500, 683510, 683600, 689610
71 P/I Converter The Type 71 P/I instruments convert pneumatic pressure into electrical signal. It is a two wire device, uses non- critical power supply and is supplied to IP65. With Hazardous Area approved to ATEX, its encapsulated electronics makes it good for shock/vibration performance. List of available models: 710101, , 710102, 712101, 712102 For price and delivery, please contact us !

R27/Manostat Precision Pressure Regulator Range The Manostat Precision Pressure Regulator Range are designed for critical pressure control applications and have demonstrated outstanding reliability in many thousands of applications worldwide. It is suitable for dead-end (closed load) conditions and can be supplied on its own or with a visual display dial. The base unit has been developed to be operated by various mechanisms making it ideal for many different applications. Versions include: handwheel, plunger, lever operated and volume boosting air relay.
R27 / Manostat Manually Operated These Manostats are available as Handwheel or Volume Boosting Air Relay operation options. » Ideal for for dead-end (closed load) conditions and can be supplied on its own or with a visual display dial. » Precise regulation of pressures up to 10 bar » Control relatively independent of flow and temperature » Ideal for dead end applications » DIN/Dial versions for visual indication of set pressures. » Low Air Consumption Non extensive list of available models (all of the following are suitable replacement units for model starting with "53"): 100200R, 10024XR, 10025XR, 10026XR, 10044XR, 10045XR, 100300R, 100400R, 13009XR, 160300R, 200400R, 220400R, 240100R 300100R, 301200R, 301300R, 301400R, 309000R, 309100R, 31001XR, 31003XR, 310100R, 311200R, 311300R, 311400R, 319000R, 319100R, 329000R
R27 / Manostat Mechanically Operated Options include Plunger, Lever and Volume Boosting Air Relay operation. » Control relatively independent of flow and temperature. » Precise regulation of pressures up to 10 bar » Ideal for dead end applications » Plunger/lever operation options available » High relief capability » Pressure range can be limited by resetting the locknuts provided » A high relief version is avaiable for applications requiring a rapid exhaust. Non extensive list of available models (all of the following are suitable replacement units for model starting with "53"): 180100R, 180200R, 180400R, 190100R, 190400R
R27/Manostat Auto/Manual Loading Stations Remote manual and auto/manual loading stations are designed for the remote control of pneumatic systems using a manostat regulator and different combinations of air switching valve and pressure gauge. » Remote control of pneumatic systems » 3-way valve for bumpless air switching » Horizontal and vertical mounting » Weatherproof option available Non extensive list of available models (all of the following are suitable replacement units for model starting with "53"): 359000R, 371201R, 379000R, 382100R, 391200R, 392100R, 393200R, 399100R, 399110R For price and delivery, please contact us !
Pressure Meter Type 300D Portable Precision Pressure Meter The type 300D portable pressure meter is a digital unit designed for the calibration and test of pneumatic instruments and systems. With Automatic Zero Calibration for added accuracy, a back-light for easy reading and standard set-up retention to ensure the last setting remains on the unit when re-powered. » Hand/held and easy to operate » Selectable units of pressure » Battery operated, up to 200 hrs life » Housed in robust plastic case
Flow Controller Indicating Air Flow Controller Type Fri-30 The Type FRI-30 is an adjustable indicating air flow controller consisting of a differential regulator, needle valve and variable area flow meter. It is suitable for level control and air purge applications. » Pressures up to 100psi » Tamperproof cover » Panel, upright mounting

We can also supply suitable replacement units for obsolete Watson Smith I/P Converters such as the Type 421, Type 423, Type 425 and type 440. Please contact us for further information.