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3. MAIN FEATURES
This section shows the main features of the Termination Unit and also details
important dimensions for the unit when installing.
3
INSTALLATION
ELECTRICAL INSTALLATION
Electrical Installation Guidelines
1.
Isolate all associated power supplies and ensure that they remain OFF
during the procedures. Ensure a gas-free atmosphere.
2.
Ensure that approved and certified cable glands have been fitted to the
Termination Unit cable entries where used for field wiring, with sealing
washers where necessary to maintain the ingress protection rating.
3.
Ensure that any cable gland/conduit locking rings are fitted before terminating
the cables.
4.
Make sure that a conduit sealing fitting is installed within 460mm (18in.) of the
Termination Unit on all conduit runs. The following diagram shows a vertical
conduit seal fixed in the conduit run close to a Termination Unit fitted with an
Optima unit. Excel Open-Path and Cross-Duct installations should be similar.
5.
Ensure that approved and certified blanking plugs are fitted to all unused
Termination Unit cable entries.
The Termination Unit mounting plate must be bonded to a protective earth.
6.
Suitable crimps and/or ferrules must be fitted when connecting more than
7.
one wire to a Termination Unit terminal.
The field terminals of the Termination Unit accept single or multi-stranded
8.
wire from 22-12 AWG (0.326 to 3.31 mm
2
), 105C. Cables should be
routed carefully to avoid physical and environmental hazards such as
mechanical stress and high temperatures.
In order to ensure correct operation and to meet requirements for RFI and
9.
EMC, it is recommended that all field cables are screened with the cable
screen connected at one end only (see the Technical Handbook).
Connect the gas detector and field wiring to the terminal blocks in the DX100 (M)
Termination Unit according to the following wiring diagrams and tables.
7
4. INSTALLATION
It is important before starting these procedures that the detailed information
provided in the DX100 Series Termination Units Technical Handbook about
DX100 (M) installation has been carefully considered at the planning stage.
General Installation Guidelines
1.
Read the Warnings and Cautions at the beginning of this document and all the
relevant instructions before starting any of the installation procedures.
2.
Identify external cable requirements and the necessary cable entry ports to be used
on the Termination Unit.
3.
Refer to the documentation for the associated control system for details about
external network connection information, field wiring, interconnections, etc.
4.
Refer to the relevant handbooks for details about the gas detectors.
5.
Isolate all associated power supplies and ensure that they remain OFF during the
procedures. Ensure a gas-free atmosphere.
MECHANICAL INSTALLATION PROCEDURES
Mechanical Installation Guidelines
1.
Identify a suitable location where the Termination Unit can be mounted. The
Termination Unit should be fitted to a flat surface.
2.
When fitting a Termination Unit consideration should be made regarding the
probability of mechanical impacts and interference from other equipment and
apparatus.
3.
The mounting plates for the Searchline Excel gas detectors, and to which the
DX100 (M) unit is attached, have fixing holes that are unthreaded. Unit and
gas detector system component mounting holes are threaded. For the identity
of other plate holes refer to the Searchline Excel Technical Handbook.
With Searchpoint Optima
DX100 (M)
This procedure describes how the
DX100 (M) is installed at the
mounting location and then the
Optima gas detector is fitted to the
Termination Unit.
Optima
(1) Securely fit the Termination
Field Cable/Conduit
Unit at the required monitoring
point.
Handheld
Use the two Termination Unit
Interrogator Socket
mounting lugs. Ensure the
communications link entry socket connector is located at the bottom. This
fulfils the requirement to position the Optima sensor horizontally so that the
risk of fouling the gas detector's optical surfaces is reduced.
4
INSTALLATION
Searchpoint Optima
Optima Wires
TB1
orange (A)
1
6
blue (B)
red (+24VDC)
black (0V)
1
white (4-20mA)
TB2
green/yellow
(earth)
6
Field Wires
+24VDC - in
0VDC - in
Modbus A
earths
Modbus B
4-20mA - out
Screen - Modbus Drain
Terminal/
Gas Detector Wiring
Field Wiring
Number
Function
Colour
TB1
1
-
-
-
2
A
Orange
-
3
B
Blue
-
4
-
-
Drain
5
-
-
Modbus B
6
-
-
Modbus A
TB2
1
+24VDC
Red
-
2
-
-
+24VDC - Supply
3
4-20mA
White
4-20mA - Output
4
-
-
-
5
0V
Black
-
6
-
-
0V - Supply
Earth
-
Earth
Green/Yellow
Earth
Posts
Barrier Earth
8
INSTALLATION
(2) Remove the Termination Unit lid.
Use the lugs on the lid to unscrew it anticlockwise from the Termination Unit
base.
(3) Fit the Optima detector to the left-hand entry.
First remove the 3/4 NPT approved blanking plug.
(4) Fit approved certified 3/4 NPT cable glands or conduit fittings to the
Termination Unit cable/conduit entries as required.
(5) Fit the external field wiring through the cable/conduit fittings and secure.
(6) Terminate the gas detector and field wiring.
Refer to Electrical Installation.
With Searchline Excel Open-Path
The DX100 (M) is fitted to the
DX100 (M)
Excel receiver's mounting plate
and then the units are wired.
(1) Securely fit the Termination
Field
Unit to the mounting plate
Cable/
so that the communications
Conduit
link entry socket connector
is located at the bottom.
Searchline Excel
Use the Termination Unit
mounting holes marked G on
Mounting Plate
the diagram below. The box
uses two of the four holes
Flexible Conduit
depending on the plate's
horizontal orientation.
(2) Remove the Termination Unit lid.
Use the lugs on the lid to unscrew it
anticlockwise from the Termination
Unit base.
G
G
(3) Attach the Searchline Excel gas
detector's cable to the Termination
Unit.
Fit to the bottom left entry after
G
G
removing the 3/4 NPT blanking plug.
(4) Fit approved certified 3/4 NPT cable
glands or conduit fittings to the
Termination Unit cable/conduit entries as necessary.
5
INSTALLATION
Searchline Excel Open-Path
Field Wires
Modbus A
Screen -
TB1
Modbus Drain
1
6
Modbus B
+24VDC in
4-20mA - out
1
earth
TB2
earth
0VDC - in
6
Excel Receiver
Wires
orange (A)
white (4-20mA)
green/yellow (earth)
blue (B)
black (0V)
red (+24VDC)
Terminal/
Gas Detector Wiring
Field Wiring
Number
Function
Colour
TB1
1
-
-
-
2
A
Orange
-
3
B
Blue
-
4
-
-
Drain
5
-
-
Modbus B
6
-
-
Modbus A
TB2
1
+24VDC
Red
-
2
-
-
+24VDC - Supply
3
4-20mA
White
4-20mA - Output
4
-
-
-
5
0V
Black
-
6
-
-
0V - Supply
Earth
-
Earth
Green/Yellow
Earth
Posts
Barrier Earth
9
INSTALLATION
(5) Fit the external field wiring through the cable/conduit fittings and secure.
(6) Terminate the gas detector and field wiring.
Refer to Electrical Installation.
With Searchline Excel Cross-Duct
The DX100 (M) is fitted to the
Cross-Duct
Cross-Duct mounting plate and then
Transmitter
the units are wired.
(1) Securely fit the Termination
DX100 (M)
Unit to the mounting plate so
that the communications link
entry socket connector is
located at the bottom.
Use the mounting holes marked
Field
G on the diagram below.
Cable/
Conduit
(2) Remove the Termination Unit
lid.
Cross-Duct
Use the lugs on the lid to
unscrew it anticlockwise from
Mounting Plate
the Termination Unit base.
(3) Attach the two cables from the Searchline Excel Cross-Duct gas detector to
the Termination Unit.
Searchline
Fit the transmitter's cable to the bottom left entry after
Excel
removing the 3/4 NPT blanking plug. Fit the receiver's
Receiver
cable to the right-hand entry after removing the 3/4
NPT blanking plug (see the diagram). Use suitably
approved certified glands/adaptors.
(4) Fit an approved certified 3/4 NPT cable gland or
conduit fitting to the Termination Unit cable/conduit
entry as necessary.
(5) Fit the external field wiring through the cable/conduit
fitting and secure.
(6) Terminate the gas detector and field wiring.
Refer to Electrical Installation.
6
INSTALLATION
Searchline Excel Cross-Duct
Field Wires
Modbus A
TB1
Screen -
Modbus Drain
1
6
Modbus B
+24VDC - in
4-20mA - out
1
earth
earth
0VDC - in
TB2
6
red (+24VDC)
green/yellow (earth)
black (0V)
Terminal/
Gas Detector Wiring
Number
Function Colour Receiver/Transmitter
TB1
1
-
-
-
2
A
Orange -
3
B
Blue
-
4
-
-
-
5
-
-
-
6
-
-
-
TB2
1
+24VDC
Red
Receiver & Transmitter
2
-
-
-
3
4-20mA
White
Receiver only
4
-
-
-
5
0V
Black
Receiver & Transmitter
6
-
-
-
Earth
-
Earth
Green/
Receiver & Transmitter
Posts
Yellow
10
Cross-Duct Receiver
Flexible Conduit
G
G
Cross-Duct
Receiver Wires
blue (B)
orange (A)
red (+24VDC)
white (4-20mA)
black (0V)
green/yellow
(earth)
Cross-Duct
Transmitter Wires
Field Wiring
-
-
-
Drain
Modbus B
Modbus A
-
+24VDC - Supply
4-20mA - Output
-
-
0V - Supply
Earth
Barrier Earth
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