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CP451-11

The Yokogawa CP451-11 is a Signal Conditioner from the UTAdvanced series of DIN-rail mounted instruments. It is specifically designed as a Pulse (Frequency) to Analog Signal Converter.

Its primary function is to accept a pulse or frequency input signal from a field device and convert it into a standardized 4 to 20 mA DC analog output signal. This allows pulse-generating sensors to be easily integrated into process control systems, PLCs, or DCSs that expect a standard analog input.

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Parameters & Specifications
Category Specification
Model Code CP451-11
Series UTAdvanced Signal Conditioners
Type Pulse / Frequency to Current Converter (Transmitter)
Input Signal Pulse or Frequency signal.
• Input Type: Line Driver (Differential) Input. The -11 suffix often denotes a differential input type, compatible with line driver outputs that use a pair of wires (A and B, or + and -) for noise-resistant communication.
• Maximum Frequency: 50 kHz (A common spec for line driver inputs, higher than contact types)
• Input Form: Differential voltage (e.g., RS-422-like).
Output Signal 4 to 20 mA DC (Two-wire, analog output)
Isolation 3-Port Isolation (3-Way Isolation):
• Input ⇨ Output
• Input ⇨ Power Supply
• Output ⇨ Power Supply
Power Supply 24 V DC (Nominal). Standard operating range: 20 to 55 V DC.
Accuracy ±0.1% of span (Typical for this converter function)
Load Resistance 0 to 550 Ω (for the 4-20mA output signal)
Response Time Adjustable (e.g., via damping function to smooth the output)
Ambient Temperature -20 to 70 °C (-4 to 158 °F)
Mounting DIN Rail Mount (Standard 35 mm DIN rail)
Case Material Plastic (Flame-retardant resin)
Protection Rating IP20 (For indoor use in a protective enclosure only. Not dust or water-resistant.)
LED Indicator Green LED for power status. Often includes an input status LED that blinks with the incoming pulses.
Connections Removable screw terminal block for easy wiring.
Safety Certifications CE marked. Complies with relevant EU directives. Often has FM and CSA approvals for general-purpose applications.