24
Figure
3: Passive pulse output.
Figure 4: Active current output.
NOTE:
The status output (terminals B1 and B-) can only be configured as passive output, the current output
(terminals I+ and I) can only be configured as active output.
See page 6 of the standard Installation and Operating Instructions for the electrical data of the available power
supplies (e.g. mains voltages, etc.).
8.3.3 Replacement of electronics unit or power fuse(s)
IMPORTANT !
The following instructions must be followed carefully if the GFC 700 F-EEx gas flow converter housing has to
be opened respectively closed !
Before opening:
♦
Make absolutely sure that there is no
explosion hazard !
♦
Gas-free certificate !
♦
Make sure that all connecting cables are
safely isolated from the power supply !
♦
Allow the prescribed waiting time to elapse before opening the housing:
20 minutes for temperature class T6
11 minutes for temperature class T5
When the instructions above are strictly followed, the cover (includes a glass window) of the electronics
compartment may be removed. First unscrew the recessed head screw of the interlocking device by a hollow-
head screw wrench
size 3
, until the cover can rotate freely. Unscrew the cover with the special plastic wrench
(black) that is supplied with the apparatus.
After opening:
♦
The copper grounding strip at the back of the electronics unit
must
be securely screwed to the housing (back-
end of electronics compartment) by screw
C
(see Figure 5). The electronics unit is mounted to the back-end of
electronics compartment by two screws
B
. Before screws
B
and
C
can be accessed, the display unit must be
removed via screws
A
.
♦
Before the cover is screwed back into the housing, the screw-thread must be
clean and well-greased with
an acid and resin-free grease
, e.g. silicone grease.
♦
Screw the cover as tight as possible into the housing by hand, until it cannot be opened by hand anymore.
Screw the recessed head screw of the interlocking device tight.
B1 B- B2
I
≤
150 mA
U
ext
≤
32V
DC
24 V
AC
000
Electronic or
electro-mechanical
totalizer
Ri
≤
680
Ω
I+ I
mA
+
_
Summary of Contents for GFM 700 F
Page 31: ...31 9 ATEX approvals 9 1 GFC 700 F EEx Signal converter...
Page 32: ...32...
Page 33: ...33...
Page 34: ...34 9 2 GFS 700 F EEx Primary head flowmeter...
Page 35: ...35...
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