KROHNE UFM 3030 EEx EN - Manual (Page 8)

8 UFM 3030
1.3.2 Optional instruments
The following options are available to support customers that have one or more ultrasonic flowmeter
systems (in compact and/or separate design) based on the UFM 500…-EEx series and need to
replace the UFC 500…-EEx electronics unit.
Because the intrinsically safe “ib” sensor circuits of UFS 500…-EEx flow sensor have almost the
same maximum values (i.e. entity parameters) as the UFS 3000…-EEx, it can also be driven by the
UFC 030…-EEx electronics unit. Therefore only four of the six SMB connectors on the front-end
printed circuit board of the UFC 030…-EEx electronics unit must be connected to the four SMB
connectors of the UFS 500…-EEx flow sensor. For proper functioning must connector number 1.1,
1.2, 2.1 and 2.2 of the UFC 030…-EEx be connected to respective number 4, 3, 1 and 2 of the
UFS 500…-EEx flow sensor.
An exception applies to the ALTOSONIC V-version UFS 500 F/5STR-EEx, which can only be driven
by five UFC 500…-EEx electronics units.
The intrinsically safe "ib" ultrasonic sensor circuits inside the UFS 500…-EEx flow sensor have the
same maximum values (i.e. entity parameters) as the UFS 3000…-EEx, except for the internal
capacitance, which is a little smaller, namely: Ci = 7.7 nF (maximum, 2 sensor circuits)
The UFS 500-EEx as part of the UFM 500 K…-EEx compact flowmeter is approved under number
PTB 01 ATEX 2015 X and the UFS 500 F/…-EEx flow sensor with a separate design has approval
number PTB 01 ATEX 2012 X. See Appendix 1.
1.4 Flow converter
The UFC 030…-EEx flow converter consists of an approved cylindrical housing, made of a die-
casted aluminium alloy (type AX/P/…-EEx with KEMA No. Ex-99.E.8128 U) or of stainless steel
(type VX-EEx with PTB No. Ex-96.D.1068 U). It contains two separate compartments, divided from
each other by wall with an integrated encapsulated flameproof terminal feed-through. The housing
of the compact version is screwed on top of the flow sensor, the housing of the separate version is
screwed on an aluminium or stainless steel wall-mounting bracket. A junction box made of die-
casted aluminium alloy or stainless steel is screwed to the side of the bracket by four M6 recessed
head screws with internal hexagonal socket set (only applicable for the flow converter in separate
design).
The flow converter housing is on both ends closed by a threaded cylindrical cover with O-ring
sealing. Coaxial cables of type RG179 or RG316 with SMB plugs at their ends connect the
intrinsically safe sensor output circuits of the flow converter to the corresponding SMB male-to-male
bulkheads in the junction box.
The equipotential bonding conductor is screwed under the external M5 U-clamp terminal, which is
located on the mounting flange at the bottom of the neck of the flow converter housing. The flow
converter housing has an ingress protection degree of at least IP67 in accordance with EN 60529.
1.4.1 Electronics
compartment
The electronics compartment accommodates the UFC 030…-EEx electronics unit. The compart-
ment is designed with type of protection flameproof enclosure "d" in accordance with EN 50018. It is
closed by a flameproof display cover with glass window, which is glued and additionally mechanical
supported by a screwed in back-up ring made of aluminum or stainless steel (depends on the
material of the housing). The interconnecting part (i.e. neck) at the bottom of the housing contains a
flameproof cable feed-through, through which the coaxial cables run. The feed-through provides a
flameproof sealing at the bottom of the electronics compartment.