Azbil VDC User Manual

Azbil Corporation Maintenance and troubleshooting
Model MTG11A/18A, MTG11B/18B, MTG14C 8-3
8-1-2: Replacement of the electronic unit for the ATEX Ex dmbia
or NEPSI Ex dmia model
m CAUTION
The following instructions must be followed carefully, when the MTG18A ATEX Ex
dmbia or NEPSI Ex dmia model converter housing has to be opened respectively
closed again!
(1) Overview
Model MTG18A flowmeter has fuses to secure the explosion proof capability.
If the fuse break occurs, the analog output remains in 0% of flow rate.
If the analog output remains in 0% flow rate, please check whether the fuse break
appears or not by following the procedures mentioned blow.
(2) Before Opening
Make sure that there is no explosion hazard.
If necessary, provide a “Gas-free certificate”.
Make sure that all connections must be voltage free.
(3) How to check the fuse break
Figure 8-2 Figure 8-3
Unscrew the displa
y
cover and loosen the three screws of the displa
y
board.
Keep the three screws for the reassembl
y
of the displa
y
board
.
Turn the displa
y
board carefull
y
aside to access the check pins on the main board.
(
Fi
g
. 8-2
)
Turn the power off.
M
easure the resistance between CP12 and CP20.
(
Fi
g
. 8-3
)
Display board
Main board
CP20(yellow check pin)
CP12(black check pin)
CM2-MTG300-2001.book 3 ページ ２０１５年９月２９日 火曜日 午前１０時１４分

Azbil VDC Specifications

General

Brand	Azbil
Model	VDC
Category	Measuring Instruments
Language	English