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Watson Smith - Controlling Pressure Worldwide
Type 421 Failsafe Compact Electronic Converter Current to Pressure (I/P)
Manifold or Rail Mount


Features

 Advanced electronic control
 High density rail or manifold mount
 Failsafe operation (output pressure falls to minimum
    on power failure)
 Vibration immune

General Description

The 421 proportional I/P converter uses advanced electronic control to achieve outstanding performance. It is highly reliable with long life, is free from the effects of vibration and its high density mounting capability makes it ideal for control room applications,

The manifold system, usually surface mounted, allows several converters to be connected to a single air supply and is available in different lengths.

Type 421 Failsafe Electronic Converter

Functional Symbol

Technical Data
Pneumatic
*Output Signal *0.2-1bar (3-15psig); minimum outlet pressure less than 15mbar (0.2psig)
*Air Supply Oil free, dry air, filtered to 5 microns; 1.5-3.5bar (20-50psig) or at least 0.7bar above maximum output pressure
*Flow Capacity Up to 150Nl/min (5scfm)
*Air Consumption 0.2 l/min typical low pressure (0.007scfm)
*Response Time 5 seconds (10 to 90% or 90 to 10% of output pressure into a 5 litre load
*Total Error +/-0.25% of span (typical, independent error includes the combined effect of non-linearity, hysteresis, deadzone and repeatability
*Temperature Effect Typically less than 1% span for span and zero between 0°C and 50°C
*Supply Sensistivity Maximum of +/-2% of outlet pressure at extremes of supply range
*Connections 1/8" NPT female
Physical
*Operating Temperature -10°C to +60°C
*IP Rating IP40
*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 Anodised natural aluminium
*Mass 600g
*Mounting Position The instrument can be mounted in any orientation. A rail clip is provided with each instrument for TS32 (EN50035)/TS35 (EN50022) rail
Electrical
*Electrical Signal 4-20mA (two wire); load presents 10 volts (+/-0.5V) constant voltage drop to the current source
*Failure Mode Signal falls to below 15mbar (0.2psig) when input signal fails
*Connections Two part quick release terminal block with capacity up to 2.5mm2 cable

Manifold
*Materials Aluminium extrusion, clear anodised, nitrile 'O' ring seals
*Port Sizes Supply and output 1/4" NPT
*Proof Pressure 10bar (150psig); pressure should be regulated to converter requirements. WARNING: maximum pressure should not be exceeded for safety reasons.
Note: It is recommended that an appropriate filter-regulator be fitted to supply all converters

Ordering Information

421

Output Pressure

Order Code

Options to specific order:

Alternative pressure ranges
Surface mounting bracket
Manifold kit for up to 20 converters

0.2-1bar

53AB2100

3-15psig

53AB0100

Manifold

Number of Ports

Order Code

5

53AA005X

10

53AA002X

15

53AA003X

20

53AA004X

Adapter kit (1 required per converter)

53AA000X


Certification

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 421 Brochure




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Watson Smith

Electronic I/P Converters

421 Failsafe
422 Failfreeze
423 Failfreeze
425 Failsafe
120 Modular I/P Pilot Booster
122 Modular I/P Pilot Booster
122E Explosion Proof

Electro Mechanical I/P and E/P Converters

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140 Failsafe Electronic Converter (I/P)
440 Multi-function Electro-Pneumatic Converter
443 Rugged Electronic Pressure Converter

Pressure Regulators

R27 Manostat Manually/Mechanically Operated
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