KROHNE GFM 700 EN - Manual (Page 24)

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.
Ÿ
B1 B- B2
I ≤ 150 mA
U
ext
≤ 32V DC
24 V AC
000
Electronic or
electro-mechanical
totalizer
Ri ≤ 680Ω
I+ I
mA
+
_