Emerson Rosemount 935 Manual de usuario

Quick Start Guide

00825-0100-4035, Rev AB

November2023

Rosemount™ 935

Open Path Combustible Gas Detectors

Legal notice

The Rosemount system described in this document is the property of Emerson.

No part of the hardware, software, or documentation may be reproduced, transmitted,

transcribed, stored in a retrieval system, or translated into any language or computer

language in any form or by any means without prior written permission of Emerson.

While great efforts have been made to ensure the accuracy and clarity of this document,

Emerson assumes no responsibility resulting from any omissions in this document or from

misuse of the information obtained herein. The information in this document has been

carefully checked and is believed to be entirely reliable with all the necessary information

included. Emerson does not assume any liability arising out of the application or any use of

any product or circuit described herein; neither does it convey license under its patent rights

or the rights of others.

WARNING

Physical access

Unauthorized personnel may potentially cause significant damage to and/or

misconfiguration of end users’ equipment. This could be intentional or unintentional and

needs to be protected against.

Physical security is an important part of any security program and fundamental to protecting

your system. Restrict physical access by unauthorized personnel to protect end users’ assets.

This is true for all systems used within the facility.

CAUTION

The transmitter and receiver are not field-repairable due to the meticuluos alignment and

calibration of the sensors and the respective circuits.

Do not attempt to modify or repair the internal circuits or change their settings, as this will

impair the system's performance and void the Emerson product warranty.

Glossary and abbreviations

Abbreviation Meaning

Analog video Video values are represented by a scaled signal.

ATEX Atmosphere explosives

AWG American wire gauge

BIT Built-in test

Digital video Each component is represented by a number representing a

discrete quantization.

DSP Digital signal processing

EMC Electromagnetic compatibility

EMI Electromagnetic interference

EOL End of line

FOV Field of view

Quick Start Guide November2023

2 Emerson.com/Rosemount

Abbreviation Meaning

HART®Highway addressable remote transducer communication

protocol

IAD Immune at any distance

IECEx International Electrochemical Commission explosion

IP Internet protocol

IPA Isopropyl alcohol

IR Infrared

IR3 Refers to the three infrared sensors

JP5 Jet fuel

Latching Refers to relays remaining in the On state even after the On

condition has been removed.

LED Light-emitting diode

LEL Lower explosive limit: The minimum concentration of a

substance (gas/vapor) in air mixture that can be ignited. This

mixture is different for every gas/vapor, measured in % of

LEL.

LEL.m Integral of concentration in LEL units (1 LEL = 100% LEL) and

the operation distance in meters (m).

LNG Liquefied natural gas

LPG Liquefied petroleum gas

mA MilliAmps (0.001 amps)

Modbus®Master-slave messaging structure

N.C. Normally closed

N.O. Normally open

N/A Not applicable

NFPA National Fire Protection Association

NPT National pipe thread

NTSC National Television System Committee (a color encoding

system)

PAL Phase alternation by line (a color encoding system)

PN Part number

RFI Radio frequency interference

RTSP Real time streaming protocol

November2023 Quick Start Guide

Quick Start Guide 3

Abbreviation Meaning

SIL Safety integrity level

UNC Unified coarse thread

Vac Volts alternating current

Vdc Volts direct current

µm Micrometer

Contents

Installation instructions.............................................................................................................. 5

Operation....................................................................................................................................22

Product certifications................................................................................................................ 29

Wiring configurations................................................................................................................31

Declaration of Conformity........................................................................................................ 35

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4 Emerson.com/Rosemount

1 Installation instructions

1.1 General considerations

1.1.1 Personnel

Only employ suitably qualified personnel who are familiar with the

local codes and practices and trained for gas detection maintenance.

Ensure that wiring is only performed and supervised by someone

with knowledge of electronics and, in particular, wiring installation.

1.1.2 Site requirements

When installing the Rosemount™ 935, take into account the weight of

the monitored gas compared to that of the surrounding air and the

individual site requirements.

Ensure that the site selected gives the receiver a direct view to the

transmitter. The mounting point for each item should be secure and

stable with minimal vibrations. Mount the equipment in a position

where it cannot be knocked out of alignment and is guarded from

physical impact.

1.1.3 Transmitter and receiver

Select the appropriate receiver for the length of open path to be

monitored.

To allow for aging of the transmitter and a reduction of the

infrared signal due to adverse weather, Emerson recommends using

a receiver that is not at the limit of its operating range. The

general recommendation is to install the receiver at a distance

from the transmitter of not more than 75 percent of the specified

operating distance. In severe weather conditions, such as offshore

oil production and exploration, reduce this distance to 50 percent.

Keep the open path between the transmitter and receiver clear of

any obstacles that might hinder the free movement of air in the

protected area or block the infrared beam.

1.1.4 Tips for gas detector locations

To provide the best detection coverage, install the detector:

•Below potential leak source for gases heavier than air.

•Above potential leak sources for gases lighter than air.

•Near to leak sources along the expected leak trajectory, taking

into account prevailing wind directions.

November2023 Quick Start Guide

Quick Start Guide 5

CAUTION

For optimal performance, avoid placing the detector in locations

frequently covered by steam.

1.1.5 Separation distances

To avoid crosstalk between adjacent open path gas detector (OPGD)

systems where transmitters are installed on the same side, keep the

relevant separation distance between the neighboring OPGD systems

according to the installation lengths as listed in Table 1-1.

Table 1-1: Minimum Separation Distances

Installation line of sight distance Minimum separation

33ft. (10m) 3.3ft. (1m)

66ft. (20m) 5 ft. (1.5 m)

98ft. (30m) 6.5 ft. (2 m)

131ft. (40m) 11.5 ft. (3.5 m)

164ft. (50m) 15 ft. (4.5 m)

197ft. (60m) 16.5ft. (5m)

230ft. (70m) 20ft. (6m)

262ft. (80m) 23ft. (7m)

295ft. (90m) 26ft. (8m)

328ft. (100m) 28 ft. (8.5 m)

361ft. (110m) 29.5ft. (9m)

394ft. (120m) 33ft. (10m)

427ft. (130m) 34.5 ft. (10.5 m)

459ft. (140m) 38 ft. (11.5 m)

492ft. (150m) 42.5ft. (13m)

525ft. (160m) 47.5 ft. (14.5 m)

558ft. (170m) 49ft. (15m)

591ft. (180m) 51 ft. (15.5 m)

693ft. (211m) 52.5ft. (16m)

656ft. (200m) 54 ft. (16.5 m)

Quick Start Guide November2023

6 Emerson.com/Rosemount

1.1.6 Wiring

For wiring, use color-coded conductors or suitable wire markings or

labels.

•The wire cross-section must be between 28 to 14 AWG (0.5 mm2

to 2.5 mm2).

•Select the wire gauge based on the number of detectors used

on the same loop and the distance from the control unit. The

maximum number of wire connections in one terminal is two wire

cross-sections, each 1 mm2.

•To fully comply with electromagnetic compatibility (EMC) directive

and protect against interference caused by radio frequency

interference (RFI) and electromagnetic interference (EMI), the

cable to the detector must be shielded, and the detector must

be grounded. Ground the shield at the detector end.

1.2 Preparations for installation

It is important to ensure that installation complies with local,

national, and international regulations and norms as applicable to

gas detectors and approved electrical devices installed in hazardous

areas.

1.2.1 Equipment

The system should include the following (in addition to the Quick

Start Guide):

Figure 1-1: Box Contents

Commissioning kit not pictured.

A. Transmitter or receiver (per box)

B. Tilt mounts

•Receiver unit: 935-R1F01XXXX

November2023 Quick Start Guide

Quick Start Guide 7

•Transmitter unit: 935-TXFXXXXXX

•Two tilt mount bases (one for the transmitter and one for the

receiver)(1)

•Extended Commissioning Kit

•Commissioning kit, three options when ordered:

—For methane calibration

—For propane calibration

—For ethylene calibration

The commissioning kit includes:

•Alignment tool kit

•Function check filters

•HART® hand-held harness kit

Other accessories are available (per customer request):

•5-in. pole mount kit

•2 to 3-in. pole mount

•Wall mount

•Protective cover

Note

See the Rosemount™ 935 Product Data Sheet for accessory part

numbers.

1.2.2 Required tools

Install the device using the following general purpose common tools

and equipment.

Table 1-2: Tools

Tool Function

Alignment kit Provides tools to install fine alignment tool.

Hex key 8 mm Mounts the detector on the tilt mount.

Hex key 3/16-in. Aligns the detector.

Hex key 5/16-in. Screws ¾ stop plug.

Flat screwdriver 4 mm Connects ground terminal.

(1) If you order a transmitter or receiver separately, then you will receive one tilt

mount.

Quick Start Guide November2023

8 Emerson.com/Rosemount

Table 1-2: Tools

(continued)

Tool Function

Flat screwdriver 2.5 mm Connects wires to the terminal block.

1.3 Certification instructions

WARNING

EXPLOSION

Do not open the detector, even when isolated, in a flammable

atmosphere.

•The cable entry point may exceed 182°F (83°C). Take suitable

precautions when selecting the cable.

•The equipment may be used with flammable gases and vapors

with apparatus groups IIA and IIB+H2 T4 in the ambient

temperature range: -67°F (-55°C) to 149°F (65°C).

•Only suitably trained personnel shall install the detector in

accordance with the applicable code of practice, e.g., EN

60079-14: 1997.

•Only suitably trained personnel shall inspect and maintain this

equipment in accordance with the applicable code of practice,

e.g., EN 60079-19.

•Only suitably trained personnel shall repair this equipment

in accordance with the applicable code of practice, e.g., EN

60079-19.

•The certification of this equipment relies upon the following

materials used in its construction:

—Enclosure: Stainless steel 316

—Windows: Sapphire glass

—Seals: EPDM

•If the equipment is likely to come into contact with aggressive

substances, then it is your responsibility to take suitable

precautions that prevent it from being adversely affected, thus

ensuring that the type of protection provided by the equipment is

not compromised.

—Aggressive substances: For example, acidic liquids or gases

that may attack metal or solvents that may affect polymeric

materials.

November2023 Quick Start Guide

Quick Start Guide 9

—Suitable precautions: For example, regular checks as part of

routine inspections or establishing from the material's Safety

Data Sheets that it is resistant to specific chemicals.

Quick Start Guide November2023

10 Emerson.com/Rosemount

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