YOKOGAWA RAMC User Manual

<8. SERVICE>
8-1
IM 01R01B02-00E-E 12th edition October 01, 2014 -00
All Rights Reserved. Copyright © 2003, Rota Yokogawa
8. Service
8.1.1 Function test
Checking free movement of pointer:
- Remove housing cover (4 screws on housing type 66).
- After deecting the pointer by hand, it must return to measurement value. If the pointer pivots to different
values upon repeated deections, there is too much friction in the bearings. In this case, send indication unit
to service.
Checking free movement of oat:
- First, free movement of pointer has to be ascertained.
- Check visually if pointer follows each ow rate change. If not, clean oat and measuring tube.
Unit with electronic transmitter:
- The display must show values corresponding to indication function and measuring unit settings.
- The bars under the 8 digits must not ash. If an error occurs, the corresponding countermeasure (refer to
chapter 6.2.8 error messages) has to be taken or the unit has to be sent to service.
- Without ow, the output current must be 0 or 4 mA. At a ow rate of 100% the current must be 20 mA.
Additional function test for HART
®
units (-H)
- check HART
®
communication using a HART
®
Handheld terminal or a PC with HART
®
communication
software.
- Setting: Device setup / Process variables
- PV AO shows the current value that should be delivered at output – Check this value using a multimeter.
8.1.2 Measuring tube, oat
The RAMC is maintenance-free. If contamination of the measuring tube impairs the mobility of the oat, the tube
and the oat have to be cleaned. To do this, the RAMC has to be removed from the pipe.
Replacement or cleaning of the oat:
- Remove RAMC from the pipe.
- Remove upper retainer from metering tube.
- Take oat stopper and oat out through the top of metering tube.
- Clean oat and metering cone
- Insert oat and oat stopper into the metering tube.
- Set retainer into tube.
- Check oat for free movement.
- Install RAMC to the pipe.
Attention: Do not expose oat to strong alternating magnetic elds. The oat and especially its measuring
edge must not be damaged.
8.1 Maintenance

YOKOGAWA RAMC Specifications

General

Brand	YOKOGAWA
Model	RAMC
Category	Measuring Instruments
Language	English