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Safety Instructions
Memosens COS81E
Supplement to BA02066C
Safety instructions for electrical apparatus in explosionhazardous areas

Memosens COS81E

XA02476C

Memosens COS81E
Supplement to BA02066C
Table of contents
Associated documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Supplementary documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Type code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Temperature table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Installation conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

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Associated documentation

Supplementary
documentation

Identification

Memosens COS81E

This document is an integral part of Operating Instructions BA02066C.

Competence Brochure CP00021Z• Explosion Protection: Guidelines and General Principles• www.endress.com

The nameplate provides you with the following information on your device:• Manufacturer identification• Order code
• Extended order code
• Serial number• Safety information and warnings• Ex marking on hazardous area versions‣ Compare the information on the nameplate with the order.
Ex-approvals
NEPSI
Ex ia op is IIC T6… T3 Ga
Ex iaD op is 20 T90/T135/T200

Safety instructions

The Memosens COS81E oxygen sensor is suitable for use in hazardous areas in accordance with:NEPSI certificate GYJ20.1074X including amendments• A maximum ambient temperature of 90 °C (194 °F) must not be exceeded at the sensor head.
• Oxygen sensors for use in hazardous areas have a special conductive O-ring. The electricalconnection of the metallic sensor shaft to the conductive mounting location (such as a metallicassembly) is via the O-ring.
• Appropriate measures must be taken to connect the assembly or the mounting location to groundin accordance with the Ex guidelines.
• The sensors must not be operated under electrostatically critical process conditions. Avoid strong
steam or dust currents that act directly on the connection system.
• The plastic housing may only be cleaned with a damp cloth.
• Ex versions of digital sensors with Memosens technology are identified by an orange-red ring on
the plug-in head.
• The maximum permitted cable length between the sensor and transmitter is 100 m (330 ft).
• The end user must adhere to the Operating Instructions and the following standards for theinstallation, operation and maintenance of the product:• GB 50257-2014 "Code for construction and acceptance of electric device for explosion
atmospheres and fire hazard electrical equipment installation engineering"• GB 3836.13-2013 "Explosive atmospheres - Part 13: Equipment repair, overhaul andreclamation"• GB/T 3836.15-2017 "Explosive atmospheres - Part 15: Electrical installations design, selectionand erection"• GB/T 3836.16-2017 "Explosive atmospheres - Part 16: Electrical installations inspection andmaintenance"• GB/T 3836.18-2017 "Explosive atmospheres - Part 18: Intrinsically safe electrical systems"

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Memosens COS81E

XA02476C• This device has been certified by the National Supervision and Inspection Center for Explosion
Protection and Safety of Instrumentation (NEPSI) and also complies with the following standards:• GB 3836.1-2010 Explosive atmospheres-Part 1: Equipment-General requirements• GB 3836.4-2010 Explosive atmospheres-Part 4: Equipment protection by intrinsic safety“i”• GB 3836.20-2010 Explosive atmospheres-Part 20: Equipment with equipment protection level(EPL) Ga• GB/T 3836.22-2017 Explosive atmospheres-Part 22: Protection of equipment and transmission
system using optical radiation• GB 12476.1-2013 Electrical apparatus for use in the presence of combustible dust- Part 1:
General requirements• GB 12476.4-2010 Electrical apparatus for use in the presence of combustible dust- Part 4:
Protection by intrinsic safety ”iD”
• Sensors containing parts made of titanium or other light metals must be protected against impact.
• In order to maintain and guarantee the explosion protection of the device, the user may notmodify the configuration in any way. Every change can compromise the safety of the device.

Type code

Memosens

COS81E-aabbccdde+gaa

Approval (no ex-relevance)NG:
Ex ia op is IIC T6/T4/T3 Ga
N5:• Ex ia op is IIC T6/T4/T3 Ga• Ex iaD op is 20 T90/T135/T200

Temperature tablebb

Measuring range (no ex-relevance)

ccCap characteristics
AC = Stainless steel C-shape
AU = Stainless steel U-shape
BC = Titanium C-shape
BU = Titanium U-shape
CC = Alloy C22 C-shape
CU = Alloy C22 U-shape
YY = Special version

ddSensor length (no ex-relevance) max. 600 mme

Material of O-ring (in the cap) (no ex-relevance)

gOptional = one or more characters determining optional features (no exrelevance), e.g. test or other certificates/declarations

Sensor

Process temperature Tp

Ambient temperature Ta

COS81E-15 ≤ Tp ≤ 130 °C (T3 rep. T200 °C)-15 ≤ Tp ≤ 120 °C (T4 rep. T135 °C)-15 ≤ Tp ≤ 70 °C (T6 rep. T90°C)-25 ≤ Ta ≤ 70 °C (T3 rep. T200 °C)-25 ≤ Ta ≤ 90 °C (T4 rep. T135 °C)-25 ≤ Ta ≤ 70 °C (T6 rep. T90°C)

The above temperature table applies only under the following installation conditions, which aredescribed in the following graphic →  6. If the installation conditions cannot be met, themaximum process temperature Tp must not exceed the maximum ambient temperature Ta.

Connection

Ex specification• The Memosens COS81E oxygen sensor is approved in accordance with the NEPSI certificateGYJ21.1074X and suitable for use in hazardous environments.
• The approved Memosens COS81E digital oxygen sensor has an intrinsically safe input with thefollowing parameter set:Endress+Hauser

Parameter

ValuePi

180 mW

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XA02476CMemosens COS81E

The approved Memosens COS81E digital oxygen sensor uses inherently safe optical radiation:
Parameter

Value

Popt (sensor signal)≤15 mW

The approved Memosens COS81E digital oxygen sensor must be connected to a Memosens cable orcable transmitter with intrinsically safe output with the following parameter:
Parameter

ValuePo

max. 180 mW

Installation conditions

4> 37 (1.46)

213A0041281

1123
4

6

Installation conditions
Limit
Distance between plug-in head (lower edge) and process medium, without ring and thrust collar
Process temperature range Tp
Ambient temperature range Ta

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