YOKOGAWA YewSeries 80, User Manual

Page: 49 / 66

6-7
IM 01B04K02-02E
Maintenance
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App
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5
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6.3.3 Correction of Input Wiring Resistance
If an error occurs because of input wiring resistance when mV DC, thermocouple or RTD
input, or if using a safety barrier such as BARD and the like with the instrument, input wiring
resistance can be corrected by parameter using JHT200 Handy Terminal.
• Correction of input wiring resistance should be made after completion of mounting
wiring.
• Do not turn off the power to the instrument while calibrating the wiring resistance.
(a) Set the parameter write protect (W.P.) of setting jumper to OFF.
(b) Short-circuit the wires for input by the sensor side.
Short-circuit the 2 wires for mV DC or thermocouple input.
Short-circuit the 3 wires for RTD input.
(c) Connect JHT200 Handy Terminal. (Refer to Figure for Wiring.)
(d) Call P01: WIRING R1 of adjustment items (P: ADJUST).
(e) Select <EXECUTE>, and press ENTER twice.
(f) After the correction, set the parameter write protect (W.P.) of setting jumper to ON if
necessary.
6.3.4 Check of Reference Junction Temperature Compensation Action
For thermocouple input, check the action of reference junction temperature compensation
using the cold junction bottle. The figure for wiring is shown in Figure 6-4.
When using the cold junction bottle, install the reference junction block (RJC) to the
terminal block, then return the terminal cover and warm up the instrument for about
15 minutes.
F0604.ai
J K
H
F
5 3 1
2 4 6
7
C A
D B
r
METER COUPLE
r: Resistance equivalent to
that of the actual lead wire
Yokogawa GS200
or the equivalent
Copper Wire
Cold Junction
Bottle
DC Voltage/
Current Standard
Thermocouple element or
compensating lead wire
Reference Junction Block
Power Supply
Figure 6-4 Check of Action for Reference Junction Temperature Compensation (Using Cold Junction Bottle)
6.3 Adjustment and Check