Controlair Type Transducer

Six models on the Controlair 500X and 550X pattern, ordered either from a twelve-line part-number table or from a four-field code. This is the range to start from when a 500 series or 550 series unit has failed and the loop has to be back in service.

What Goes Wrong

A 500 or 550 pattern transducer fails, and the loop it serves is a standard 4-20 mA to 3-15 psi conversion that any competent instrument can do. What is hard to find quickly is a unit with the same footprint, the same 1/4 NPT and 1/2 NPT ports and the same front-face zero and span screws, so that the replacement goes on the bracket that is already there.

How This Range Solves It

The EAA-500 family is built to that pattern and published against a full selection table: twelve I/P part numbers from 3-9 psi at 90 ohms to 3-120 psi at 260 ohms, and eight E/P part numbers from 615 to 985 ohms. The EAA-550 family covers the same ground in a miniature body with a coded ordering system that reaches 0-120 psig.

Who Orders From This Range

• Plants holding a single standard I/P spare
• Valve workshops assembling actuator packages to a fixed spring range
• Panel and DIN rail assemblies with no room for a full-size transducer
• Loops that need a zero-based output a 3-15 psi unit cannot give

Where It Is Applied

• Chemical Processing
• HVAC And Building Services

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