Yokogawa EJA110A Manual do Utilizador descarregar pdf (Página 58)

IM 01C21B01-01E

9-2

9. MAINTENANCE

Table 9.2.1 Instruments Required for Calibration

Name RemarksYokogawa-recommended Instrument

Power

supply

Model SDBT or SDBS distributor

Load

resistor

Model 2792 standard resistor [250 Ω ±0.005%, 3 W]

Load adjustment resistor [100 Ω ±1%, 1 W]

Voltmeter

Model 2501 A digital multimeter

Accuracy (10V DC range): ±(0.002% of rdg + 1 dgt)

Digital

manometer

Model MT220 precision digital manometer

1) For 10 kPa class

Accuracy: ±(0.015% of rdg + 0.015% of F.S.)

±(0.2% of rdg + 0.1% of F.S.)

2) For 130 kPa class

Accuracy: ±0.02% of rdg

±5digits

±(0.2% of rdg + 0.1% of F.S.)

3) For 700 kPa class

Accuracy: ±(0.02% of rdg + 3digits)

±5 digits

±(0.2% of rdg + 0.1% of F.S.)

4) For 3000 kPa class

Accuracy: ±(0.02% of rdg + 10 digits)

±(0.2% of rdg + 0.1% of F.S.)

5) For 130 kPa abs class

Accuracy: ±(0.03% of rdg + 6 digits)

4 to 20 mA DC signal

Select a manometer having

a pressure range close to

that of the transmitter.

Pressure

generator

Model 7674 pneumatic pressure standard for 200 kPa {2 kgf/cm

}, 25 kPa {2500 mmH

Accuracy: ±0.05% of F.S.

Requires air pressure

supply.

Pressure

source

Model 6919 pressure regulator (pressure pump)

Pressure range: 0 to 133 kPa {1000 mmHg}

Prepare the vacuum pump

for negative pressure

ranges.

Dead weight gauge tester 25 kPa {2500mmH

Accuracy: ±0.03% of setting

Select the one having a

pressure range close to

that of the transmitter.

T0901.EPS

for 0 to 10 kPa

for -10 to 0 kPa

for 25 to 130 kPa

for 0 to 25 kPa

for -80 to 0 kPa

for 100 to 700 kPa

for 0 to 100 kPa

for -80 to 0 kPa

for 0 to 3000 kPa

for -80 to 0 kPa

for 0 to 130 kPa abs

. . . . .

. . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . .

. . . . . . . . . . .

. . . . . . . . .

. . . . . . . . . . . .

Note: The above table contains the instruments capable of performing calibration to the 0.2% level. Since special maintenance and management

procedures involving traceability of each instrument to higher-level standards are required for calibration to the 0.1% level, there are

difficulties in calibration to this level in the field. For calibration to the 0.1% level, contact Yokogawa representatives from which the

instrument was purchased or the nearest Yokogawa office.

RRc

Using pressure

generator

Reference pressure

High pressure side High pressure side

Low pressure side

open to atmosphere

Low pressure side

open to atmosphere

Supply pressure

Pressure generator

Load resistance,

250 Ω

Load

adjusting

resistance,

100 Ω

Digital voltmeter

Power

supply

RRc

Using pressure

source with

manometer

Reference pressure

Pressure source

Model MT220

precision digital manometer

Load resistance,

250 Ω

Load

adjusting

resistance,

100 Ω

Digital voltmeter

Power

supply

F0901.EPS

Figure 9.3.1 Instrument Connections

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 82 83

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