Yokogawa EJA118 - Manual (Page 49)

IM 1C22H1-01E 8-2
8. MAINTENANCE
Table 8.2.1 Tools for Disassembly and Reassembly
Name Remarks Yokogawa-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 MT110, MT120 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 2657 pneumatic pressure standard for 200 kPa {2 kgf/cm 2 }, 25 kPa {2500 mmH
2
O}
Accuracy: ± 0.05% of F.S. or ± 0.1% setting (whichever is greater)
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
2
O}
Accuracy:
±
0.03% of setting
Select a pressure generator
having a pressure range
close to that of the transmitter.
T0801.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
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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.
P
P
V
Mating calibration flange
Load resistance, 250
Ω
Model MT110, MT120
precision digital manometer
High pressure side
diaphragm seal
Rc
R
Load adjustment
resistance, 100
Ω
Digital voltmeter
Power
supply
E
Low pressure side diaphragm seal
Model 2657 pneumatic
pressure standards
Pressure source
Supply pressure
If a pressure
generator is used:
If a pressure source
and a manometer
are combined:
F0801.EPS
Figure 8.3.1 Instrument Connections