Yokogawa MLD Bedienungsanleitung PDF herunterladen (Seite 8)

IM 61A01A01-01E-A

5. CALIBRATION

The Loop Indicators are factory calibrated to 0-100% unless the /SC (for MLA) or /ENG (for MLD)

options are specified.

Calibration check for MLA Analog Type Units

(1) The MLA model ships with a 0-100% scale unless ordered with the /SC Special Scale option.

(2) Connect unit to Voltage/Current Standard (red to +, black to -). Voltage/Current Standards can be

purchased through Yokogawa Corporation of America. Recommended models are CA11

(Voltage/Current Calibrator) or CA71 (Multifunction Calibrator).

(3) The values to check are shown in the table below. Apply the minimum value and adjust the zero

manually first. The zero adjustment can be performed by using a special tool or small needle nose

pliers and twisting the white Teflon piece in the center of the meter element. Be careful not to

damage the meter movement.

Suffix –A

4-20mA

Suffix –B

10-50mA

Suffix –C

1-5V

4.0mA

10mA

1.0VDC

20%

7.2mA

18mA

1.8VDC

40%

10.4mA

26mA

2.6VDC

60%

13.6mA

34mA

3.4VDC

80%

16.8mA

42mA

4.2VDC

100%

20.0mA

50mA

5.0VDC

(4) Verify the meter readings are within specification.

Calibration of MLD Digital Type Units

(1) The MLD model ships with a calibration range of 0-100% unless ordered with the /ENG

Engineering Units option.

(2) If adjustments are needed the 2 screws holding the plate will need to be removed

(3) Connect unit to Voltage/Current Standard (red to +, black to -). Voltage/Current Standards can be

purchased through Yokogawa Corporation of America. Recommended models are CA11

(Voltage/Current Calibrator) or CA71 (Multifunction Calibrator).

(4) Set range switches based on the following table (for standard 0-100% unit set SW1 and SW8 to

ON):

1 2 3 4 5 6 7 8 9 10

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