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Watson Smith - Controlling Pressure Worldwide
Type 422 Failfreeze Electronic Converter Current to Pressure (I/P)

Features

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

The 422 proportional I/P converter uses advanced electronic control to achieve outstanding performance. It offers failfreeze operation in addition to conventional I/P charactersitics and its rugged construction, vibration immunity and weatherproofing make it ideal for field application.

Type 422 Failfreeze Electronic I/P Converter

Functional Symbol

Technical Data
Pneumatic
*Output Signal 0.2-1bar (3-15psig) low pressure unit; 0.2-8bar (3-120psig) high pressure unit; minimum outlet pressure less than 140mbar (2psig)
*Air Supply Oil free, dry air, filtered to 5 microns; at least 0.7bar above maximum output pressure
*Flow Capacity Up to 300Nl/min (10scfm)
*Air Consumption 0.2 l/min typical (0.007scfm) low pressure ; 0.4 l/min typical (0.013scfm) high pressure
*Response Time 5 seconds (low pressure unit), 12 seconds (high pressure unit) (from 10 to 90% of output pressure into a 5 litre load)
*Total Error Max. error +/-0.25% of span (low pressure), +/-0.5% (high pressure) (typical, independent error includes the combined effect of non-linearity, hysteresis, deadzone and repeatability
*Temperature Effect Typically better than 1% span between -10°C and 60°C
*Supply Sensistivity Negligible effect
*Connections 1/4" NPT female standard (plus two integral 1/4" NPT gauge ports); others available on request
Physical
*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
*Electrical Signal 4-20mA (two wire); load presents 6 volts (+/-0.5V) constant voltage drop to the current source
*Failure Mode Signal held at previous value when input signal falls below 2mA +/-0.5mA; drift rate 0.02% in 30 seconds (mid-range)
*Connections 30mm square connector DIN 43650 provided, mountable in four directions

Certification

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.

PDF

Type 422 Brochure


Ordering Information


AC0100 422/4-20MA/3-15PSI
AC127X 422/4-20MA/3-15PSI 1/2" NPT J-BOX TOP ENTRY
AC130X 422/4-20MA/3-15PSI 1/2" NPT J-BOX TOP ENTRY (TAP M5)
AC138X 422/4-20MA/0.2-1KGCM2
AC2100 422/4-20MA/0.2-1BAR

TYPE 422 (FAILFREEZE) IP CONVERTERS - ATEX INTRINSICALLY SAFE VERSION

AC301PK1 422/4-20MA/3-15PSI 1/4" NPT CAPTURED BLEED/ATEX IS
AC301BK1 422/4-20MA/0.2-1BAR 1/4" NPT CAPTURED BLEED/ATEX IS
AC301PJ1 422/4-20MA/3-15PSI 1/4" BSP CAPTURED BLEED/ATEX IS
AC301BJ1 422/4-20MA/0.2-1BAR 1/4" BSP CAPTURED BLEED/ATEX IS




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Watson Smith

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Pressure Regulators

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R27 Auto/Manual Loading Stations

Pressure Control Valves

VP12 Miniature
VP50 3-Way
VP50S 3-Way
VP51 3-Way Programmable

Other Products

Air Preparation Accessories
300D Portable Precision Pressure Meter
FRI30 Flow Controller

Obsolete

68 P/I Converter

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