DX100 (M) Termination Unit Quick Start Guide

1. Introduction

The DX100 (M) Termination Unit is an explosion-proof active junction box designed to provide a signal connection point for Honeywell's Searchpoint Optima and Searchline Excel range of gas detectors, along with their associated field wiring. It also serves as a mounting point for the Searchpoint Optima and Optima Plus detectors. Certified to UL and CSA standards, the unit is intended for use in hazardous environments.

The Termination Unit facilitates a digital interface between the attached gas detector and an RS485 link to the network controller. For detailed information on gas detector digital address configuration, refer to the DX100 Series Termination Units Technical Handbook.

The DX100 (M) offers:

• Terminals for connecting the gas detector and field cabling.
• An Intrinsically Safe (IS) connection point for the Hand Held Interrogator (SHC1).
• A local mounting point for the Searchpoint Optima or Optima Plus gas detector.

The unit features three 3/4” NPT cable/conduit entries, two terminal blocks, and a voltage clamp with a communications link entry socket.

When used with an Optima or Optima Plus detector, one of the unit's three cable/conduit entries (typically the left-hand one) is used for direct mounting of the gas detector. The detectors output a 4-20mA signal, which is transmitted via the Termination Unit and field wiring back to the system controller.

The voltage clamp and external socket provide the IS connection to the Handheld Interrogator (SHC1), enabling operator interaction for commissioning, calibration, or diagnosis of the attached gas detector. Comprehensive details on gas detector operation, including the SHC1, are available in their respective technical documents.

Caution: Only the SHC1 Handheld Interrogator should be connected to the DX100 (M) communication link entry socket.

This guide covers the basic on-site mechanical and electrical installation of the unit. For more detailed information, consult the DX100 Series Termination Units Technical Handbook (Part No: 2104M0701).

Information notices used in this document:

WARNINGS: Indicate hazardous or unsafe practices that could result in severe injury or death to personnel.

Caution: Indicates hazardous or unsafe practices which could result in minor injury to personnel, or product or property damage.

Note: Provides useful/helpful/additional information.

2. Safety

Ensure you read and understand this document BEFORE installing or operating the equipment. Pay particular attention to the Safety Warnings.

WARNINGS:

1. The DX100 (M) Termination Unit is certified for and intended for use in potentially hazardous areas. Install and use the unit in accordance with the latest regulations. No modifications are permitted without reference to the relevant certifying authority.
2. Install UL approved and certified equipment, including field wiring, in strict accordance with the National Electrical Code for Division 1 Hazardous Locations (NFPA 70).
3. Install CSA approved and certified equipment, including field wiring, in strict accordance with Canadian Electrical Code, Part 1.
4. For installations elsewhere, use the appropriate local or national regulations.
5. Comply with the Code of Practice regarding Selection, Installation, Use And Maintenance Of Apparatus For The Detection Of Combustible Gases (Other Than For Mining Applications Or Explosive Processing And Manufacture).
6. The DX100 (M) Termination Unit must be properly earthed to protect against electrical shock, minimize electrical interference, and comply with IS Safety Requirements.
7. Dismantling or repair of equipment should be carried out in the safe area only.
8. Do not drill holes in the housing, as this will invalidate the explosion protection.
9. To maintain electrical safety, the unit must not be operated in atmospheres with more than 21% oxygen.
10. Do not open the enclosure in the presence of an explosive atmosphere.

CAUTIONS:

Only the Handheld Interrogator (SHC1) must be connected to the Termination Unit's communication link entry socket.

Honeywell Analytics reserves the right to change or revise the information supplied in this document without notice and without obligation to notify any person or organization of such revision or change. If further details are required that do not appear in this document, contact Honeywell Analytics or one of its agents.

6. Specifications

Connections

• Searchpoint Optima
• Searchpoint Optima Plus
• Searchline Excel
• Searchline Excel Cross-Duct
• Field wiring.

Inputs

• IS protected Honeywell SHC1 Handheld Interrogator communications (RS485)
• 4-20mA (Non-isolated).

Outputs

• 4-20mA (Non-isolated).

Power Supply

• 18-32VDC.

Environmental

Operating temperature

• UL -25°C to 40°C (-13°F to 104°F).
• CSA -55°C to 40°C (-67°F to 104°F).

Enclosure

Entry Socket

• One IS protected Communications Link Entry Socket for connecting the Honeywell SHC1 Handheld interrogator.

Cable/Conduit Entries

• Three 3/4 NPT entries (one each side and one in the bottom) to accept gas detector and field cabling or 3/4” conduit.

Size

• 212mm (8.35in.) wide x 152.4mm (6in.) high x 117.5mm (4.625in.) deep. Add approximately 60mm (2.36in.) to the height for the Communications Link Entry Socket.

Weight

• 2.5kg.

Material

• Aluminium.

Ingress Protection

• IP66 to BS EN 60529, Degrees of protection provided by enclosures (IP code).

Certification

• UL Class I, Div 1, Groups B, C, D
• CSA Class I, Div 1, Groups B, C, D
• (see Certification for details)

Digital Interface

• Use the Modbus® RTU communications protocol

Field Wiring

• 22-12 AWG (0.326 to 3.31mm²), 105°C

6. Certification

This section specifies UL and CSA certification information for the DX100 (M) Termination Unit, including relevant Control Drawings.

A Honeywell Analytics certification label is located on the right-hand side of the DX100 (M) Termination Unit, containing all relevant product identification and certification state information.

UL/CSA Certification Label

Textual Description of Diagram: A diagram illustrating the UL/CSA Certification Label. The part number for the DX100 (M) Termination Unit is 2104B2382.

UL Control Drawing

Textual Description of Diagram: A diagram illustrating the UL control drawing for the DX100 (M) Termination Unit. It depicts connections for Sensor, Control Equipment, and a Handheld Calibrator (SHC1) to the Termination Unit within a hazardous location (Class 1 Div 1 Groups B,C,D). Key notes include: 1. Apparatus must not be supplied from, nor contain in normal or abnormal conditions, a source of potential with respect to earth in excess of 250V rms or 250V d.c. 2. Wiring from the Handheld Calibrator (SHC1) to the Termination Unit (DX100) must not exceed 15 meters. 3. Install equipment, including field wiring, in accordance with articles of the National Electrical Code for Division 1 Hazardous Locations. The drawing shows entry points for Sensor, Non-Hazardous Area Supply, Transmitter, and the Communications Link Socket.

CSA Control Drawing

Textual Description of Diagram: A diagram illustrating the CSA control drawing for the DX100 (M) Termination Unit. It is similar to the UL drawing, showing connections for Sensor, Control Equipment, and a Handheld Calibrator (SHC1) in a hazardous location (Class I, Div 1 Groups B,C,D). Key notes include: 1. Apparatus must not be supplied from, nor contain in normal or abnormal conditions, a source of potential with respect to earth in excess of 250V rms or 250V d.c. 2. Wiring from the Handheld Calibrator (SHC1) to the Termination Unit (DX100) must not exceed 15 meters. 3. Install equipment, including field wiring, in accordance with Canadian Electrical Code, Part 1. The drawing shows entry points for Sensor, Non-Hazardous Area Supply, Transmitter, and the Communications Link Socket.

3. Main Features

This section outlines the main features of the Termination Unit and details important dimensions for installation.

Textual Description of Diagram: A diagram displays the Termination Unit, highlighting key features and dimensions. Labeled components include: Mounting Lug, Communications Link Entry Socket, Removable Screwed Lid, and Gland/Conduit Entries. The unit's dimensions are provided as: 177.8mm (7in.) height, 152.4mm (6in.) width, and 117.5mm (4.625in.) depth. An additional 60mm (2.36in.) is noted for the height of the Communications Link Entry Socket.

4. Installation

It is important to carefully consider the detailed information provided in the DX100 Series Termination Units Technical Handbook regarding DX100 (M) installation during the planning stage before commencing any procedures.

General Installation Guidelines

1. Read the Warnings and Cautions at the beginning of this document and all relevant instructions before starting any 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, and interconnections.
4. Refer to the relevant handbooks for details about the gas detectors.
5. Isolate all associated power supplies and ensure they remain OFF during the procedures. Ensure a gas-free atmosphere.

Mechanical Installation Procedures

Mechanical Installation Guidelines

1. Identify a suitable location for mounting the Termination Unit. The unit should be fitted to a flat surface.
2. When fitting the Termination Unit, consider the probability of mechanical impacts and interference from other equipment and apparatus.
3. The mounting plates for the Searchline Excel gas detectors, to which the DX100 (M) unit is attached, have unthreaded fixing holes. Unit and gas detector system component mounting holes are threaded. Refer to the Searchline Excel Technical Handbook for the identity of other plate holes.

With Searchpoint Optima

This procedure describes how to install the DX100 (M) at the mounting location and then fit the Optima gas detector to the Termination Unit.

Textual Description of Diagram: A diagram illustrates the DX100(M) unit and the Optima detector, showing the field cable/conduit and the handheld interrogator socket. Step (1) involves securely fitting the Termination Unit at the required monitoring point using the mounting lugs, ensuring the communications link entry socket is at the bottom to position the Optima sensor horizontally, reducing the risk of fouling its optical surfaces. Step (3) details fitting the Optima detector to the left-hand entry after removing the 3/4 NPT approved blanking plug.

1. Securely fit the Termination Unit at the required monitoring point. Use the two Termination Unit mounting lugs. Ensure the communications link entry socket connector is located at the bottom. This fulfills the requirement to position the Optima sensor horizontally so that the risk of fouling the gas detector's optical surfaces is reduced.
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 Excel receiver's mounting plate and then the units are wired.

Textual Description of Diagram: A diagram shows the DX100(M) unit mounted to a Searchline Excel Receiver mounting plate, indicating the field cable/conduit and the communications link entry socket. Step (1) involves securely fitting the Termination Unit to the mounting plate using holes marked 'G', ensuring the communications link entry socket connector is at the bottom. Step (3) describes attaching the Excel detector's cable to the bottom left entry after removing the 3/4 NPT blanking plug.

1. Securely fit the Termination Unit to the mounting plate so that the communications link entry socket connector is located at the bottom. Use the Termination Unit mounting holes marked G on the diagram. The box uses two of the four holes 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.
3. Attach the Searchline Excel gas detector's cable to the Termination Unit. Fit to the bottom left entry after 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. 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 mounting plate and then the units are wired.

Textual Description of Diagram: A diagram shows the DX100(M) unit mounted to a Cross-Duct mounting plate, indicating the field cable/conduit, the Cross-Duct Transmitter, and the Cross-Duct Receiver. Step (1) involves securely fitting the Termination Unit to the mounting plate using holes marked 'G', ensuring the communications link entry socket connector is at the bottom. Step (3) details attaching the transmitter's cable to the bottom left entry and the receiver's cable to the right-hand entry, after removing the respective 3/4 NPT blanking plugs.

1. Securely fit the Termination Unit to the mounting plate so that the communications link entry socket connector is located at the bottom. Use the mounting holes marked G on the diagram.
2. Remove the Termination Unit lid. Use the lugs on the lid to unscrew it anticlockwise from the Termination Unit base.
3. Attach the two cables from the Searchline Excel Cross-Duct gas detector to the Termination Unit. Fit the transmitter's cable to the bottom left entry after removing the 3/4 NPT blanking plug. Fit the receiver's 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.

Electrical Installation

Electrical Installation Guidelines

1. Isolate all associated power supplies and ensure 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.
5. Ensure that approved and certified blanking plugs are fitted to all unused Termination Unit cable entries.
6. The Termination Unit mounting plate must be bonded to a protective earth.
7. Suitable crimps and/or ferrules must be fitted when connecting more than one wire to a Termination Unit terminal.
8. The field terminals of the Termination Unit accept single or multi-stranded wire from 22-12 AWG (0.326 to 3.31 mm²), 105°C. Cables should be routed carefully to avoid physical and environmental hazards such as mechanical stress and high temperatures.
9. To ensure correct operation and to meet requirements for RFI and EMC, it is recommended that all field cables are screened with the cable screen connected at one end only (see the Technical Handbook).

Textual Description of Conduit Seal Diagram: A diagram illustrates a vertical conduit seal fitting installed in a conduit run close to a Termination Unit fitted with an Optima unit. The seal is positioned within 460mm (18in.) of the unit, as recommended for all conduit runs.

Wiring Diagrams and Tables

Searchpoint Optima Wiring

Textual Description of Diagram/Table: A wiring diagram shows connections for the Searchpoint Optima. Terminal Block TB1 (terminals 1-6) and TB2 (terminals 1-6) are depicted. Optima wires are color-coded: Orange (A), Blue (B), Red (+24VDC), Black (0V), White (4-20mA), and Green/Yellow (earth). Field wires include: +24VDC in, 0VDC in, earths, 4-20mA out, Modbus A, Modbus B, and Screen - Modbus Drain. A table details the Terminal Number, Gas Detector Wiring Function/Colour, and Field Wiring Function.

Searchline Excel Open-Path Wiring

Textual Description of Diagram/Table: A wiring diagram shows connections for the Searchline Excel Open-Path. Terminal Block TB1 (terminals 1-6) and TB2 (terminals 1-6) are depicted. Excel Receiver wires are color-coded: Orange (A), Blue (B), Red (+24VDC), White (4-20mA), Green/Yellow (earth), and Black (0V). Field wires include: Modbus A, Screen - Modbus Drain, Modbus B, +24VDC in, 4-20mA out, earth, earth, and 0VDC in. A table details the Terminal Number, Gas Detector Wiring Function/Colour, and Field Wiring Function.

Searchline Excel Cross-Duct Wiring

Textual Description of Diagram/Table: A wiring diagram shows connections for the Searchline Excel Cross-Duct. Terminal Block TB1 (terminals 1-6) and TB2 (terminals 1-6) are depicted. Cross-Duct Receiver wires are: Blue (B), Orange (A), Red (+24VDC), White (4-20mA), Black (0V), and Green/Yellow (earth). Cross-Duct Transmitter wires are: Red (+24VDC), Black (0V), and Green/Yellow (earth). Field wires include: Modbus A, Screen - Modbus Drain, Modbus B, +24VDC in, 4-20mA out, earth, earth, and 0VDC in. A table details the Terminal Number, Gas Detector Wiring Function/Colour (Receiver/Transmitter), and Field Wiring Function.