Emerson Rosemount 936 User manual

Quick Start Guide
00825-0100-4036, Rev AA
April 2021
Rosemount™ 936
Toxic Open Path Gas Detector

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
All individuals who have or will have responsibility for using, maintaining, or servicing the product must
read this manual thoroughly.
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 source and detector are not field-repairable due to the meticulous 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
CMOS Complementary metal oxide semiconductor image sensor
Digital video Each component is represented by a number representing a discrete quantization.
DSP Digital signal processing
EMC Electromagnetic compatibility
EMI Electromagnetic interference
HART®Highway addressable remote transducer communication protocol
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Abbreviation Meaning
IAD Immune at any distance
IECEx International Electrochemical Commission explosion
IP Internet protocol
IR3 Refers to the three infrared sensors
LED Light-emitting diode
LNG Liquified natural gas
mA MilliAmps (0.001 amps)
Modbus®Master-slave messaging structure
N/A Not applicable
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
ppm Concentration in parts per million. Defines the amount of gas molecule parts per million
molecules of atmospheric
ppm.m Integral of concentration in ppm units times the distance in meters.
RFI Radio frequency interference
RTSP Real time streaming protocol
SIL Safety integrity level
UNC Unified coarse thread
UV Ultraviolet
Vac Volts alternating current
Vdc Volts direct current
µm Micrometer
Contents
Installation................................................................................................................................... 5
Operation...................................................................................................................................26
Product certifications................................................................................................................. 33
Wiring configurations.................................................................................................................35
Declaration of Conformity..........................................................................................................41
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1 Installation
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 Required tools
You can install the detector using general purpose common tools and
equipment.
Table 1-1: 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.
Flat screwdriver 2.5 mm Connects wires to the terminal block.
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1.1.3 Site requirements
When installing the Rosemount 936, 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 detector a direct view to the source.
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.
1.1.4 Source and detector
Select the appropriate detector for the length of open path to be monitored.
To allow for aging of the source and a reduction of the infrared signal due to
adverse weather, Emerson recommends using a detector that is not at the
limit of its operating range. The general recommendation is to install the
detector at a distance from the source 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 source and detector clear of any obstacles
that might hinder the free movement of air in the protected area or block
the infrared beam.
1.1.5 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.
•Between the leak source and potential ignition sources.
CAUTION
For optimal performance, avoid placing the detector in locations frequently
covered by steam.
1.1.6 Separation distances
To avoid cross talk between adjacent Open Path Gas Detector (OPGD)
systems where transmitters are installed on the same side, keep the relevant
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separation distance between the neighboring OPGD systems according to
the installation lengths as listed in Table 1-2.
Table 1-2: Minimum Separation Distances
Installation line of sight distance, ft.
(m)
Minimum separation, ft. (m)
33 (10) 3.3 (1)
66 (20) 5 (1.5)
98 (30) 6.5 (2.5)
131 (40) 11.5 (3.5)
164 (50) 15 (4.5)
197 (60) 16.5 (5)
1.1.7 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).
•The selected wire gauge should be 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.
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1.2 Preparations for installation
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. Source and detector
B. Tilt mounts
•Detector unit: 936R1T2XXXX
•Source unit: 936TXT00XXXX
•Two tilt mount bases
—One base is used for the detector.
—One base is used for the ultraviolet (UV) source.
The commissioning kit (for H2S or NH3) includes:
•Magnetic mode selector
•Handle for cover opening
•Alignment tool kit
•Function check filter: for H2S or NH3
Other accessories are available, per customer request:
•Pole mount (u-bolt 5 in. [127 mm])
•HART® handheld harness kit
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•Protective cover
1.2.2 Required tools
You can install the detector using general purpose common tools and
equipment.
Table 1-3: 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.
Flat screwdriver 2.5 mm Connects wires to the terminal block.
1.3 Certification instructions
WARNING
Do not open the detector, even when isolated, in a flammable atmosphere.
WARNING
The cable entry point may exceed 182 °F (83 °C).
Take suitable precautions when selecting the cable.
•Only suitably certified cable entry devices or conduit shall be used for
connections, and unused openings shall be blanked off using suitably
certified stopping plugs.
•The marking of the equipment is:
Ex II 2(2) G D
Ex db eb ib [ib Gb] IIB+H2 T4 Gb
Ex tb IIIC T135 °C Db
•The equipment may be used with flammable gases and vapors with
apparatus groups IIA and IIB + H2 T4 in the ambient temperature range:
-67 to 149 °F (-55 to 65 °C).
•Installation shall be carried out by suitably trained personnel in
accordance with the applicable code of practice, e.g., EN60079-14:1997.
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•Connections to the intrinsically safe (I.S.) port on the side of the detector
enclosure should be made using equipment that maintains the
instrinsically safe levels of protection.
•Inspection and maintenance of this equipment shall be carried out by
suitably trained personnel 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: 316L stainless steel
—Windows: sapphire glass
—Seals: EPDM
•If the equipment is likely to come into contact with aggressive
substances (described below), then it is the operator's responsibility to
take suitable precautions (described below) to 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.
—Suitable precautions: For example, regular checks as part of routine
inspections or establishing from the material's data sheets that it is
resistant to specific chemicals.
•The output of the optical radiation source with respect to explosion
protection meets Exception 3 from the scope of UL 60079-28.
1.3.1 Intrinsically safe (I.S.) outputs
Intrinsically safe outputs through the I.S. ports have the following
parameters:
Paramet
er
Channels
Light-
emitting
diode
(LED) 1
LED 2 HART®
connecti
on
RS485+ RS485- 5 V All
combine
d
Uo 6.51 V 6.51 V 6.51 V 6.51 V 6.51 V 6.51 V 6.51 V
Io 68.5 mA 68.5 mA 68.5 mA 68.5 mA 68.5 mA 68.5 mA 689.5 mA
Po 111.5
mW
111.5
mW
111.5
mW
111.5
mW
111.5
mW
111.5
mW
111.5
mW
Ci 0 µF 0 µF 0 µF 0 µF 0 µF 0 µF 0 µF
Li 0 µH 0 µH 0 µH 0 µH 0 µH 0 µH 0 µH
Co 22 µF 22 µF 22 µF 22 µF 22 µF 22 µF 22 µF
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Paramet
er
Channels
Light-
emitting
diode
(LED) 1
LED 2 HART®
connecti
on
RS485+ RS485- 5 V All
combine
d
Lo 7.5 mH 7.5 mH 7.5 mH 7.5 mH 7.5 mH 514 µH 96.9 µH
Note
Co @ 6.6 V is 22 µF, as per Table A.2 of IEC 60079-11:2011. Lo is calculated
based on 1.5 times current for IIC, 40 µJ using E = 0.5 *(LI)2
1.3.2 Special conditions for safe use from ATEX IECEx certificate
The dimensions of the flameproof joints differ from the relevant minimum
or maximum values required by Table 2 of IEC/EN 60079-1: 2007 for IIB + H2,
as detailed in Table 1-4.
Table 1-4: Flamepaths
Flamepath
description
Type of joint Minimum width "L"
in inches
(millimeters)
Maximum gap "ic" in
inches (millimeters)
Cylindrical section of
spigot (both ends of
Ex d compartment)
Cylindrical 0.59 (15) 0.003 (0.08)
1.2-in. (30 mm)
diameter window
fitted against
enclosure
Flanged 0.42 (10.7) 0.001 (0.02)
1.6-in. (39.5 mm)
diameter window
fitted against
enclosure
Flanged 0.39 (10) 0.001 (0.02)
•Gaps, "ic", should not be modified to be any larger, and widths, "L", should
not be modified to be any shorter than the values in Table 1-4.
•Connections to the intrinsically safe (I.S.) port on the side of the detector
enclosure should be made using equipment that maintains the
intrinsically safe levels of protection.
•The Um should be installed in accordance with one of the following:
—The Um is 18 to 32 Vdc in a SELV/PELV system.
—Via a safety isolating transformer, complying with the requirements
of IEC 61588-2-6 or technically equivalent standard.
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—Directly connected to apparatus, complying with IEC 60950, IEC
61010-1, or technically equivalent standard.
—Fed directly from cells or batteries.
•If the product is to be used as a safety related device, an appropriate
independent certification, would be required meeting all the
requirements.
1.3.3 North American conditions of acceptability from certificate CSA
80023016
Conditions for Canadian installations
1. The dimensions of the flameproof joints are other than the relevant
minimum or maximum values required by Table 2 of CAN/CSA-C22.2
No. 60079-0:19 Ed. 4 for IIB + H2, as detailed below:
Flamepath
description
Type of joint Minimum width
"L" (mm)
Maximum gap
"ic" (mm)
Cylindrical
section of spigot
(both ends of Ex
d compartment)
Cylindrical 15 0.08
30 mm diameter
window fitted
against
enclosure
Flanged 10.7 0.02
39.5 mm
diameter
window fitted
against
enclosure
Flanged 10 0.02
Gaps shall not be machined to be any larger than the values of "ic",
and widths shall not be modified to be any smaller than the values of
"L" shown in the table above.
2. Connections to the intrinsically safe (I.S.) port on the side of the
detector enclosure shall be made via equipment which maintains the
intrinsically safe levels of protection.
3. Where Um marked on the associated apparatus is less than 250 V, it
shall be installed in accordance with one of the following:
•Where Um does not exceed 50 Vac or 120 Vdc, in a SELV or PELV
system or
•Via a safety isolating transformer complying with the
requirements of CAN/CSA-C22.2 No. 66.1 or technically
equivalent standard or
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•Directly connected to apparatus complying with CAN/CSA-C22.2
No. 60950-1, CAN/CSA-C22.2 No. 61010-1 or technically
equivalent standard or
•Fed directly from cells or batteries.
4. The output of the optical radiation source with respect to explosion
protection meets Exception 3 from the scope of CAN/CSA-C22.2 No.
60079-28:16 Ed.1.
5. Upon installation, remove the plastic transit plug from the cable
entry and use a cable fitting or a conduit fitting with the following
specification to connect the cable to the equipment:
•Ex marking: Ex eb IIC Gb, Ex tb IIIC Db
•Temperature rating: -55 °C to +83 °C or better
•Connecting thread: M25 x 1.5 or ¾-in. national pipe thread (NPT)
6. Equipment is only to be installed by manufacturer trained personnel.
7. Equipment has only been tested for electrical safety. No evaluation of
functional safety and performance characteristics has been
conducted.
8. The equipment shall be supplied with Limited Energy Circuit (LEC) as
defined in CSA C22.2 No. 61010-1-12 or Limited Poweer Source (LPS)
as defined in CAN/CSA C22.2 No. 60950-1.
Conditions for US installations
1. The dimensions of the flameproof joints are other than the relevant
minimum or maximum values required by Table 2 of UL
60079-0:2019 Ed. 7 for IIB + H2, as detailed below:
Flamepath
description
Type of joint Minimum width
"L" (mm)
Maximum gap
"ic" (mm)
Cylindrical
section of spigot
(both ends of Ex
d compartment)
Cylindrical 15 0.08
30 mm diameter
window fitted
against
enclosure
Flanged 10.7 0.02
39.5 mm
diameter
window fitted
against
enclosure
Flanged 10 0.02
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Gaps shall not be machined to be any larger than the values of "ic",
and widths shall not be modified to be any smaller than the values of
"L" shown in the table above.
2. Connections to the intrinsically safe (I.S.) port on the side of the
detector enclosure shall be made via equipment which maintains the
intrinsically safe levels of protection.
3. Where Um marked on the associated apparatus is less than 250 V, it
shall be installed in accordance with one of the following:
•Where Um does not exceed 50 Vac or 120 Vdc, in a SELV or PELV
system or
•Via a safety isolating transformer complying with the
requirements of UL 5085-1 or technically equivalent standard or
•Directly connected to apparatus complying with UL 60950-1, UL
61010-1, or technically equivalent standard or
•Fed directly from cells or batteries.
4. The output of the optical radiation source with respect to explosion
protection meets Exception 3 from the scope of UL 60079-28:2017
Ed. 2.
5. Upon installation, remove the plastic transit plug from the cable
entry and use a cable fitting or a conduit fitting with the following
specification to connect the cable to the equipment:
•Ex marking: Class I Zone 1 AEx eb IIC Gb, Zone 21 AEx tb IIIC Db
•Temperature rating: -55 °C to +83 °C or better
•Connecting thread: M25 x 1.5 or ¾-in. national pipe thread (NPT)
6. Equipment is only to be installed by manufacturer trained personnel.
7. Equipment has only been tested for electrical safety. No evaluation of
functional safety and performance characteristics has been
conducted.
8. The equipment shall be supplied with Class 2 as defined in article
725.121 or NFPA 70.
1.4 Install conduits and cables
The conduit and cable installation must comply with the following
guidelines:
•To avoid water condensation in the detector, install it with the conduits/
cable entries facing downwards.
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•Use flexible conduits/cables for the last portion connecting to the
detector.
•When pulling the cables through the conduits, ensure that they are not
tangled or stressed. Extend the cables about 12-in. (30 cm) beyond the
detector location to accommodate wiring after installation.
•After pulling the conductor cables through the conduits, perform a
continuity test.
1.5 Mount detector and source to tilt mount
You can install the detector and source in two ways with the same tilt
mount.
Refer to Figure 1-3 and Figure 1-4.
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Figure 1-2: Mounting the Tilt Mount and Detector
A. Front shield
B. Back cover
C. Security screw
D. Locating pins
E. Alternate mounting location
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Figure 1-3: Tilt Mount
A. Detector/source holding plate
B. Vertical fine alignment screw
C. Tilt mount holding plate
D. Horizontal fine alignment screw
E. Vertical crude alignment tightening screw
F. Vertical fine alignment tightening screw
G. Horizontal crude alignment tightening screw
H. Horizontal fine alignment tightening screw
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Figure 1-4: Detector and Tilt Mount Assembly
A. Back cover
B. Detector
C. Alignment tool tightening bolt
D. Alignment tool
Table 1-5: Tilt Mount Kit
Item Quantity Type / model
Tilt mount 1 N/A
Screw 1 M10 x 1.5
Spring washer 1 No. 10
Prerequisites
Prior to mounting the tilt mount to a stable surface, verify that the line of
site is unobstructed and corresponds to the detector's installation distance.
Procedure
1. Place the tilt mount holding plate in its designated location and
secure it with four fasteners through four holes with diameters of
0.3-in. (8.5 mm).
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NOTICE
Skip this step if the tilt mount is already installed.
Removing the detector for maintenance purposes does not require
removing the tilt mount.
2. Place the detector with its conduit/cable inlets pointing downwards
on the detector holding plate of the tilt mount.
3. Secure the detector with M10 x 1.5 screws with number M10 spring
washers.
4. Secure the detector to the tilt mount using hex key number 7 for
M10 x 1.5 screws.
5. Repeat steps Step 1 through Step 4 to install the source.
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1.6 Install detector wiring
Procedure
1. Release the back cover secure bolt and open the detector back cover.
The chamber is now revealed.
Figure 1-5: Detector with Cover Removed
A. Housing
B. Terminal board
C. Inlet conduit
D. Detector holding plate
E. Earth terminal
F. Connection to Field Communicator
2. Remove the protective plug mounted on the detector conduit/cable
entry inlet.
3. Pull the wires through the detector inlet conduit.
4. Use a ¾-in. - 14 national pipe thread (NPT) or M25 x 1.5 conduit
connection/cable gland to assemble the cable conduit to the
detector.
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