ABB ontinuous Gas Analyzers AO2000 Series AO2040CU Ex Central Unit in Category 2G
ontinuous Gas Analyzers AO2000 Series
AO2040CU Ex Central Unit in Category 2G
Cable opening M20 for power supply on the control unit for the pressurized
enclosure system
Cable openings for internal wiring connections
Connection plate with 6 black cable openings M20 for non-intrinsically safe
wiring (some cable openings are used for internal wiring connections)
Metallic cable opening M20 for the shielded system bus cable of the
AO2060-… analyzer module
Cable opening M20 for the 24-VDC connection cable of the
AO2060-… analyzer module
Potential compensation connectors
3 light blue cable openings M20 for intrinsically safe wiring
Threaded Cable
Connections
Permissible Cable
Diameters
Inserting the Cable in
the Housing
Type of Connector
Application
Light blue M20 connector Intrinsically safe connecting leads
Black M20 connector
Non-intrinsically safe connecting leads, AO2060-…
analyzer module 24 VDC connecting cable
Metallic M20 connector
AO2060-… analyzer module system bus cable (see
page 14 for special notes and instructions)
The M20 threaded connectors are suitable for cables with outer diameters of
6-12 mm.
Step Action
Remove the cap nut on the threaded connector and remove both seal
rings.
Slide the cap nut 1 and seal rings over the cable.
6-8 mm OD Cable: Use seal rings 2 and 3.
8-12 mm OD Cable: Use seal ring 2 only.
Pass the cable through the intermediate openings 4 in the housing.
Tighten cap nut 1 (torque to 2.5 Nm).
Sealing Unused
Cable Connections
• Only the manufacturer’s original equipment plugs should be used to close off the
threaded cable connectors.
• Unused cable connectors must be closed off with factory-provided plugs.
• Securely tighten the cap nuts on the unused cable connectors (torque to 2.5 Nm).
AO2040-CU Ex Central Unit Electrical Equipment
Device
Description
For Connection, See -K01 -K02 -K03 -K04
Isolation relays (-K01 standard, -K02 through -K04 optional) for system bus and
non-intrinsically safe signal leads, maximum load 30 VDC/0.4 A
Page 15 -K05
Terminal strip for connecting the 8-wire AO2060-… analyzer module system bus
cable leads not connected to isolation relay -K01
Page 13 -Z01
Line filter for connecting the 3-wire AO2060-… analyzer module 24 VDC cable
Page 13 -B01
Pressurized enclosure system control unit, power supply (230 VAC or 115 VAC,
non-adjustable) status signal pe
< 1.2 hPa
Page 21 -B02
ER 144A/Ex isolation amplifier (option) for condensate monitor,
intrinsically safe connection, EEx ia IIC input current circuit,
electrical specifications per EC type certification TÜV No. 00 ATEX 1604
Page 16 -B03.1 -B03.2
Contrans I V17131-530 isolation amplifier (option) for flow monitor,
intrinsically safe connection, EEx ia IIB/IIC or EEx ib IIB/IIC input current circuit,
electrical specifications per EC type certification PTB 99 ATEX 2119
Page 17 -B04.1 -B04.2 -B04.3 -B04.4
Contrans I V17153-510 passive isolator (option) for current output,
intrinsically safe connection, EEx ib IIB/IIC output current circuit,
electrical specifications per EC type certification PTB 00 ATEX 2017X
Page 18 -B05.1 -B05.2 -B05.3
Contrans I V17132-520 valve control unit (option) for solenoid valves,
intrinsically safe connection, EEx ib IIC output current circuit,
electrical specifications per EC type certification PTB No. Ex-96.D.2013
Page 19 -B06.1 -B06.2
Contrans I V17133-510 isolation relay (option) for switch contact,
intrinsically safe connection, EEx ia IIB/IIC or EEx ib IIB/IIC switch contact circuit,
electrical specifications per EC type certification PTB 99 ATEX 2067X
AO2060-… Analyzer
Module Connecting
Cables
System Bus
The following cables are factory-connected to the AO2060-… analyzer module:
• 10 meter system bus cable (8 x 0.5 mm2) and
• 10 meter 24 VDC connecting cable (3 x 2.5 mm2).
The cables are routed through pressure-tight cable passages.
Connecting
AO2060-…
Analyzer Module to
AO2040-CU Ex
Central Unit
Use of a
Connection Box
System Bus
Termination Resistor
Total Length of
System Bus Wiring
Normally the following connections are made (see Figure 4):
• System bus cable to isolation relay -K01 and to terminal strip -K05 and
• 24 VDC connecting cable to line filter -Z01.
A connection box should be used if the AO2060-… analyzer module cable is too
short or multiple AO2060-… analyzer modules are to be connected to the
AO2040-CU Ex central unit.
For additional information and connecting diagrams see the AO2060-… analyzer
modules operator’s manual (publication number 42/24-12 EN).
In the AO2040-CU Ex central unit, the system bus termination resistor is attached
to the electronics module.
The total system bus wiring length should not exceed 350 meters.