Yokogawa CA700 pressure calibrator

Power control: Press the power button on the front panel to turn on the device, and the device will automatically perform self check and calibration. After success, the main menu will be displayed; To shut down, press and hold the power button until the "Power Off?" prompt appears. Press the ENTER key to confirm the shutdown, and the device will save the settings before shutdown. It will automatically resume the next time it is turned on; After starting up, it is necessary to preheat for at least 30 minutes to ensure measurement accuracy, and avoid high-precision measurement operations during the preheating period.

Battery level indicator: The screen icon area displays the remaining battery level through the battery icon. If the battery level is too low, it needs to be replaced in a timely manner. When the battery is depleted, the current measurement data may not be saved; When the current or voltage source function is turned on, battery consumption accelerates. It is necessary to prepare a backup battery in advance to avoid interruption of the calibration process.

（3） Connection and Calibration

Cable connection: Before connecting, the power supply of the device under test must be turned off. The current/voltage source and the measurement cable (standard L4059PR) must be correctly connected to the corresponding terminals. The current/voltage output should be connected to the "Source mA/V" and "COM" terminals, the current input should be connected to the "MEASURE mA" and "COM" terminals, and the voltage input should be connected to the "MEASURE V" and "COM" terminals; The pressure input port needs to be equipped with a suitable connector according to the interface type. Before connection, it is necessary to wrap sealing tape and use two wrenches to fix the port and connector separately to prevent damage to the internal structure of the equipment. After connection, it is necessary to check for leaks.

Date and Time Setting: Select "Device Setting" from the main menu and press ENTER to enter the device settings menu. Page to the second page and select "Date Format" to set the date display format (such as YYYY/MM/DD). Then set "Date" and "Time" separately, adjust the values using the directional keys, press ENTER to confirm, and finally press "Setting Done (F5)" to save the settings. Date and time are used for data recording and file naming, ensuring accuracy.

Zero point calibration: Before pressure measurement, zero point calibration needs to be performed, keeping the equipment in the measurement posture (horizontal placement, front panel facing up or tilted with back panel support), opening the pressure input port, pressing the ZERO key on the pressure measurement display interface, confirming the prompt, pressing the ENTER key to perform calibration, and pressing the ESC key to cancel; When the ambient temperature or equipment posture changes, recalibration is required. When measuring liquids, the pipeline and equipment should be filled with liquid before calibration; After connecting the external pressure sensor, it is also necessary to perform zero calibration separately. Please refer to the sensor manual for the operation method.

Calibration process of pressure transmitter

（1） Connection configuration

Hardware connection: The output of the pressure pump needs to be connected to both the pressure transmitter input and the CA700 pressure input port through a branch pipeline. Some pressure pumps come with dual output ports (for pressurization and pressure measurement respectively); The electrical output terminal of the pressure transmitter needs to be connected to the CA700 signal terminal, the H terminal of the transmitter should be connected to the "Source mA/V" terminal of CA700, and the L terminal should be connected to the "Measure mA" terminal; High pressure transmitter calibration can use external pressure sensors, which need to be connected to the external pressure sensor input terminal of the device with a dedicated cable when CA700 is powered off. After the device is turned on, the corresponding icon will be displayed when the sensor is successfully recognized.

（2） Calibration settings

Program selection: Select "Calibrate" from the main menu and press the ENTER key to enter the calibration interface. Press the "Select Proc. (F2)" key to display a list of registered calibration programs (up to 20 groups). Use the page flipping and directional keys to select the program to be edited, press the ENTER key to view program information, and then press the "Edit (F1)" key to enter the settings interface. The interface is divided into three pages: "Transmitter Information", "Measure", and "Source", which can be switched by long pressing the directional keys.

Device Information Settings: On the "Transmitter Information" page, enter the model number (up to 20 characters), tag number (up to 32 characters), and serial number (up to 15 characters). Use the arrow keys to move the input position, press ENTER to confirm the character input, and then press "Done (F5)" to save; The device information will be saved to a file along with the calibration data, making it easier to associate and trace the data with the device.