Yokogawa RAMC - Manual (Page 68)

<8. SERVICE>
8-4
IM 01R01B02-00E-E 10th edition January 01, 2013 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
8.1.6 Exchange of indicator
The indication units may be replaced by units of the same type, on the condition that the scale of the
measuring tube as well as the calibration EEPROM (in case of electronic transmitter) are mounted on the new
unit.
Operation for units with electronic transmitter (-E / -H) :
- Switch off power.
- For units with option /KF1 wait more than 2 minutes before opening the indicator.
- For RAMC with housing type 91 unlock the safety screw at the cover.
- Unscrew cover of indication unit.
- Disconnect cables and pull them through the cable glands out of the RAMC.
- Remove scale and calibration EEPROM from old indication unit and mount them to new indication unit.
The calibration-EEPROM can be damaged by electro-static discharge (ESD) . Therefore, only touch
insulated parts and never terminals.
- Do not bend pointer when mounting.
- Mount cover of indication unit.
- Dismount old indication unit from the measuring tube and replace it with a new one. Be sure to mount shims
and distance rollers in the same sequence as before disassembled.
8.1.7 Troubleshooting
In case the RAMC does not work properly, use the following flow charts for troubleshooting, then check,
isolate and remedy the fault.
Precision problems with "T" unit: execute test 1
Precision problems with "E" or "H" unit: execute test 1 and test 2
HART
®
communication problems with "H" unit: execute test 3 and see chapter 7.5.
If the indicated countermeasure do not remedy the fault or in case of troubles which cannot be remedied by
the user, please contact your YOKOGAWA service centre.
T81.EPS
metering
WARNING