Field Loop Verification with the Yokogawa CA550 Multifunction Calibrator
Yokogawa CA550 is a portable multifunction calibrator intended for source-and-measure work on field instrumentation. Identify whether the job is loop current, voltage, resistance, RTD, thermocouple, frequency or pulse verification, then choose the correct terminals, leads and operating mode. For CA550, the calibration procedure should define the expected input, source value, tolerance and pass/fail limits before connecting to a live loop.
Specification snapshot
| Selection point | Specification / confirmation |
|---|---|
| Representative model | CA550 |
| Instrument | Portable multifunction process calibrator |
| Signals | DC voltage/current, RTD, thermocouple, resistance, frequency and pulse |
| Accuracy | CA550 published DC current accuracy: 0.010% |
| Patterns | Linear, step and program sweep functions |
| Options | HART function and accessories depend on the selected unit/options |
Source, measure and simulate deliberately
The CA500/CA550 family supports multiple electrical and temperature signal types and includes sweep patterns. Use CA550 according to the instrument manual and task-specific safety procedure: isolate process signals when required, confirm source versus measure mode, and avoid applying a test signal to an active circuit unintentionally. Check the selected RTD or thermocouple standard and cold-junction assumptions when comparing temperature values.
Accuracy, records and HART
Manufacturer information lists CA550 DC current accuracy at 0.010%; accuracy is function- and range-dependent, so use the detailed specification and calibration status for the chosen measurement. If CA550 is expected to communicate with HART devices, verify that the required function is enabled and supported by the instrument configuration and firmware. Preserve as-found/as-left readings and identify the standards used for traceable work.
Related unit and accessories
the related configuration is included below as a related code. Check exactly what the suffix/package includes before comparing it with CA550. Lead sets, thermocouple adapters, USB connection, carrying case and certificates may be standard, optional or separately ordered depending on the quotation. State signal types, accuracy need, HART requirement, included leads, accessories and calibration documentation when requesting CA550.
Related model configurations
- CA550-F2
Information for model verification
For CA550, include the complete nameplate code, application, interface and operating conditions in an enquiry. Retain CA550 with the equipment record and verify the exact specification before replacement or project release. Record the exact model code CA550 in the purchase request.
