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I/P Transducers
  “Cair” offers I/P Transducers (converter).
The Cair 500 IP series transducers are ideally used to convert current or voltage input signal to a linearly proportional pneumatic output pressure. This versatile instrument is rugged and reliable force balance transducers for use in both process control and industrial applications, for standard process control applications which typically utilize 3 to 15 psig output and industrial & high pressure application which typically utilize pressure output up to 120 psig. Aira 500 IP series transducers combines low cost, high accuracy and minimum air consumption with field proven technology. Versatile design features and rugged, compact housing with a choice of CMRI and ATEX* approved versions for explosion proof or intrinsically safe operation when used with a suitable barrier.
Principle of Operation
The Cair 500 IP series transducer is a balance device in which, when electrical current is passed through the coil of transducer, a magnetic field is created which acts on the magnet assembly, casuing the anvil & diaphragm to move away from or forward the nozzle (flapper nozzle) depending on the direction of current flow. Motion at the nozzle assembly is proportional to the amount of current passing through the coil.
The flapper/anvi  move away from or forward towards the nozzle creates back pressure which acts as pilot pressure to an integral booster relay. When in put electrical current increases (or decreases for reverse acting) causes proportional output pressure increases. Zero and Span are calibrated by turning easily accessible adjusting screw on the front face of the unit. The zero adjusting screw causes the nozz e to move relative to the flapper / anvil. The span adjusting screw is a potentiometer that limits the current through the coil. A thermistor circuit in series with the coil provides temperature compensation.
Split Ranging
If split ranging id required the 4-20 mA input and 3-15 psig output version (Cair IP-501) can be recalibrated to provide 3-9 psig or 9-15 psig output.
The Cair 500IP series transducers can be pipe, panel or bracket mounted in any position. Position other than vertical will require recalibration of the zero and span adjustment. Transducers should be mounted in a vibration-free area.
Field Reversible
All Cair 500IP series transducers are calibrated at the factory for direct acting operation but may be used in reverse acting mode by reversing the polarity of signal leads and recalibrating. When calibrated for reverse acting applications it provide a minimum of their full rated output pressure (i.e. 3 psig) upon inputsignal failure.
Integrated Characteristics
Compact Design.
Low Air Consumption.
Integral Volume Booster flow capacity up to 20 SCFM is boosted by the built in volume booster.
Field Reversible  Output provides inversely proportional to input signal.
Flexible Adjustments of Zero & Span.
Standard Process Inputs.
Split Ranging.
NEMA4X (IP65) Enclosure Optional.
Saving in Investments.
CMRI and ATEX approval pending.
The Cair 500 IP series transducers converts electrical signal to a pneumatic output which can be used to operate the followings:
Valve, Valve-Actuators
Damper and Louver Actuators
Valve Positioners
Web Tensioners and Brakes
Used in:
Petrochemical Processing Systems
Energy Management
HVAC Systems
Textile Processing Systems
Pharmaceutical Processing System
Pulp and Handling Controls
Specifications Low Output Range (up to 30 psig) High Output Range (up to 120 psig)
Supply Pressure Range (Min./Max.) Minimum - 21 kPa(3psig) above maximum output Maximum - 700 kPa (100 psig) Minimum = 35 kpa (5psig) above maximum output
Maximum - 1050 kPa (150 psig)
Supply Pressure Sensitivity ±   0.15%   of span per 10kpa (±  0.1 % of span per psig at mid range) ± .005% of span per 7.0 kpa (1.0 psig)
Terminal Based ± 1.0% of Span
± 1.5% of span typical ± 2.0%max.
Linearity ±  0.5% of span
± 1.0% of span
Repeatability ±   1.0% of Span ± 1.0% of span
Hysteresis Response Time Depends on pressure range typ. less than 0.25 sec. for 3-15 psig units Depends on pressure range - typ.
Flow Rate 7.6m3/hr(4.5 SCFM) at *175kpa(25psig) supply 20.0m3/hr (12.0 SCFM) at 700 kpa (100 psig) supply 40.8m3/hr(24.0 SCFM) at 1050 pa (150 psig) supply
Relief Capacity 3.4 m3/hr(2SCFM) at 35 kpa (5psig)above 140 kpa (20 psig)
set point
11.9m3/hr(7SCFM) at 35kpa (10psig) above 140 kpa (20 psig) set point
Maximum Air Consumption Media
0.3m3/hr(0.15 SCFM) at midrange typical Oil free, clean dry air filtered to 40 microns. 0.15 m3/hr (0.08 SCFM) at midrange typ.
Temp. Range (Operating) -30°C to 60°C(-20°F to 140°F)  
Port Sizes 1/4" NPT (Pneumatic) DIN 43650 connector (Electric) 1/4" NPT (Pneumatic) DIN-43650 connector (Electric)
Weight 2.2 Ibs. (1.0kg) approx. 2.2 lbs.(1.0kg) approx
IP 501     I/P Transducers 500IP
Output Range
Part No. Input psi kpa lmpedance±1%
IP 501 4-20 mADC 3-15 20-100 200Ώ
IP 502 4-20 mADC 9-15 60-100 110Ώ
IP 503 4-20 mADC 3-9 20-60 110Ώ
IP 504 4-20 mADC 3-27 20-185 240Ώ
IP 505 4-20 mADC 6-30 40-200 240Ώ
IP 506 4-20 mADC 1-17 7-117 270Ώ
IP 507 10-50 mADC 3-15 20-100 90Ώ
IP 508 10-50 mADC 3-27 20-185 105Ώ
IP 509 10-50 mADC 6-30 40-200 105Ώ
IP 510 4-20 mADC 2-60* 14-420 245Ώ
IP 511   3-120* 20-830 280Ώ
IP 512 0-60 mADC 2-120* 15-830 240Ώ
E/P Transducers 500 IP   
IP 513 0-5VDC 3-15 20-100 625Ώ
IP 514 0-5VDC 3-17 20-185 550Ώ
IP 515 0-5VDC 6-30 40-200 560Ώ
IP 516 1 -9VDC 3-15 20-100 1010Ώ
IP 517 1 -9VDC 3-27 20-185 860Ώ
IP 518 1 -9VDC 6-30 40-200 860Ώ
IP 519 0-5VDC 2-60* 14-120 520Ώ
IP 520 0-10VDC 3-120* 20-830 825Ώ
* Output shows is as calinrated at at the factory. Large span adjustment capability allows recalibration to achieve output ranges from 20-240 kpa (3-35 psig) to 20-1000kpa (3-145 psig)
** Approved Pending
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