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Watson Smith - Controlling Pressure Worldwide
Type 423 Failfreeze Electronic Converter Current to Pressure (I/P)


 Advanced electronic control
 Failfreeze operation (output pressure retained on
    power failure)
 Vibration immune
 Weatherproof General Description

The 423 proportional I/P converter uses advanced electronic control to achieve outstanding performance. It has a rugged construction, vibration immunity and weatherproofing making it ideal for field applications.

Type 423 Failfreeze Electronic I/P Converter

Functional Symbol

Technical Data
*Output Signal 0.2-1bar (3-15psig); minimum outlet pressure less than 140mbar (2psig)
*Air Supply Oil free, dry air, filtered to 3 microns;1.5-3.5bar(20-50psig) or at least 0.7bar above maximum output pressure
*Flow Capacity Up to 300Nl/min (10scfm)
*Air Consumption 0.6l/min typical (0.02scfm)
*Response Time 5 seconds (from 10 to 90% of output pressure into a 0.5 litre load)
*Total Error Max. error ±0.5% of span (typical,independent error includes combined effect of non-linearity,hysteresis,deadzone and repeatability)
*Temperature Effect Typically better than 1% span between -10°C and 60°C
*Connections 1/4” NPT female standard (plus two integral 1/4” NPT gauge ports); others available on request
*Operating Temperature Operating Temperature-20°C to +70°C
*IP Rating IP65
*Vibration The unit possesses a high degree of immunity
*Electromagnetic Compatibility Compliant and CE marked in accordance with the EC E.M.C. directive. Tested to standards: BS EN50082-2: 1995, BS EN50081-2: 1994
*Material of Construction Zinc diecasting passivated and epoxy painted, Verton glass/nylon cover; nitrile diaphragms
*Mass 800g
*Mounting Position Operation in any attitude is possible without recalibration; integral surface mounting bracket provided for vertical mounting
*Electrical Signal 4-20mA (two wire)
*Failure Mode Signal falls below 15mbar(0.2psig) when input signal fails
*Connections 30mm square connector DIN43650provided, mountable in four directions. Others available on request

Ordering Information
Output Pressure Order Code
3-15psig 53AD0100
0.2-1bar 53AD2100


Hazardous area approvals: The 422 is available with Type NllT6 approval to BS6941 1998 or Type EEx ia llCT4 approval for intrinsically safe applications.
All instruments are tested on the Watson Smith Automatic Testing System and an individual test certificate is provided at no extra charge. Each unit is tested for linearity, hysteresis, total error, settling error, over pressure, air consumption, response time, calibration, insulation, start-up current, supply sensitivity and voltage load.


Type 423 Brochure

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Watson Smith

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Keison International Ltd. trading as:
Keison Products, VoIPon Solutions & 4Gon
keison VoIPon Solutions 4Gon