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Documents & Manuals

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Work Order Templates

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Yokogawa Transmitter YTA610

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Maintenance Plans for Yokogawa Transmitter Model YTA610

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Transmitter Maintenance

Each component of this instrument is configured in units to make maintenance easier.

This chapter contains disassembly and assembly procedures associated with calibration, adjustment and part replacement required for maintenance of the affected instrument.

IMPORTANT

1. Maintenance of this instrument should be performed in a service shop where the necessary tools are provided.

2. Handling the MAIN and Indicator assembly.

Some of the parts contained in the MAIN and Indicator assembly are susceptible to static electricity damage. Before performing maintenance, use a ground wrist band or other antistatic measures, and avoid touching the electronic components and circuits with bare hands.

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Transmitter Calibration

Calibration

This instrument is fully factory-tested and is guaranteed for the intended accuracy, eliminating the need for calibration. When calibration needs to be varified, the following equipment and calibration procedure is recommended.

To conduct calibration required to evaluate the uncertainty while using the instrument, follow the steps below:

1. Connect each equipment, and warm up for 3 minutes or more. Lay wiring on the input side according to the sensor to be used.

2. For DC voltage input

With a voltage generator, deliver input signals corresponding to 0, 25, 75, or 100% of the input span to the temperature transmitter. Measure the resulting input signal with the voltmeter (digital multimeter) and check the output value relative to the input value.

3. For thermocouple input

Since this instrument is equipped with a reference junction compensating function, use a reference junction compensating function in universal calibrator in order to compensate for this function upon calibration.

According to the reference millivolt table for thermocouple, obtain millivolt corresponding to 0, 25, 50, 75, or 100% of the span, and use that power as the input value, then deliver it from the universal calibrator to the temperature transmitter.

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Integral Indicator Replacement

Replacement of Integral Indicator

 Removal of integral indicator

1. Remove the cover.

2. Remove two nuts while using your hand to support the integral indicator.

3. Remove the indicator assembly from the MAIN assembly. At this time, straighten and pull the indicator assembly forward so that the connector connecting the MAIN assembly and the indicator assembly is not damaged.

 Mounting the Integral indicator

1. Place the Indicator assembly in desired direction over the MAIN assembly.

2. Align the mounting hole of the Indicator assembly with the stud bolt hole, and carefully insert the indicator into the connector in a straight manner so that the connector is not damaged.

3. Tighten the two nuts that secure the indicator.

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