CA51/CA71 is a Yokogawa company's fieldbus adapter for thermocouple (TC) and resistance temperature detector (RTD). CA51 communicates with the host via RS-232C serial port, while CA71 communicates with the host via Ethernet (TCP/IP). CA51/CA71 can connect one or more TC/RTD modules, and output 4-20mA current signal. The module supports up to 32 TC/RTD input signals, with a measurement range of -200°C to 600°C. The module adopts a plug-in design for easy installation and maintenance.
The CA71 portable process calibrator offers simultaneous signal generation and measurement of multiple parameters such as voltage, current, resistance, thermocouple (TC), RTD, frequency and pulse. The basic CA51 model shares most functions with the CA71, except for TC and RTD measurement and communication features.
The device includes RS‑232C communication, step‑wise and automatic stepping output, storage for up to 50 data sets, temperature monitoring, and optional accessories like AC adapters and RJ‑sensor cables. It complies with IEC and EN safety standards and is powered by a 5‑28 V external supply or four AA batteries. This manual is written in Chinese.
| External Power Supply | 5‑28 V |
|---|---|
| Battery | 4 x AA carbon batteries |
| Maximum Output Current | 10 mA |
| AC Voltage Measurement Range | 0‑300 V AC |
| Accuracy (example range) | 0.02 % + 0.1 mV |
| Data Storage Capacity | Up to 50 data sets |
Yes, the CA71 can measure AC voltage, including the power‑supply voltage.
The CA71 includes an RS‑232C communication interface.
The device can store up to 50 sets of generated and measured data.