Maintenance, 1 calibration apparatus, 2 calibration procedure – Yokogawa JUXTA VJTK User Manual
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All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation
IM 77J01T21-01E
2nd Edition : 2007.02.09-00
12. MAINTENANCE
The product enters the operable status as soon as the power is turned on, but requires 10 to 15 minutes of warm-up to meet the per-
formance requirements.
12.1 Calibration Apparatus
●
Calibrator (Yokogawa Meters & Instruments’ CA71 or equivalent): 1
●
Temperature sensor (Yokogawa Meters & Instruments’ B9108WA or equivalent): 1
●
Setting tool for adjustment (Refer to “8.2 Connecting the Setting Tools” in this manual.)
12.2 Calibration Procedure
(1) Connect the instruments as shown in Fig.12.1 and Fig. 8.2.
(2) Produce the input signal equivalent to 0% of the input range from the calibrator to the product. Then, read the input value of
Display items, “A01: INPUT1” using the VJ77 or JHT200 and check that the input value is within the rated accuracy range.
Take the same procedure for the input signal equivalent to 25, 50, 75 and 100% of the input range and check that the input val-
ues are within the rated accuracy range.
For alarm output, check the relay action by the alarm indicator lamp or resistance of output terminals.
If the input values are out of the rated accuracy range, adjust the input signal level referring to the user’s manual for VJ77 PC-
based Parameters Setting Tool (IM 77J01J77-01E) or for JHT200 Handy Terminal (IM JF81-02E).
10
11
3
2
1
4
5
6
7
8
9
11
10
8
3
1
4
RJC
Temperature
sensor
(B9108WA)
9
7
5
2
COM
GND
ALM2 (NO)
ALM1 (NO)
COM
Calibrator
Calibrator
RJC sensor
Calibrator
Alarm-2 output
Input
Alarm-1 output
Power supply
L+
N–
+
–
Fig. 12.1