XA02543C/07/EN/02.24-00
71649079
2024-03-31

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Safety Instructions
Memosens CLS15E, CLS16E,CLS21E, CLS82E
Digital conductivity sensors with Memosens technology
NEPSI Ex ia IIC T3/T4/T6 Ga

Memosens CLS15E, CLS16E, CLS21E, CLS82E

XA02543C

Memosens CLS15E, CLS16E, CLS21E, CLS82E
Digital conductivity sensors with Memosens technology
Table of contents
Associated documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Supplementary documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4Certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Temperature tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

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Associated documentation

Memosens CLS15E, CLS16E, CLS21E, CLS82E

This document is an integral part ofOperating Instructions Memosens CLS21E, BA02020C
Operating Instructions Memosens CLS15E, BA02018C
Operating Instructions Memosens CLS16E, BA02019C
Operating Instructions Memosens CLS82E, BA02027C

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

Supplementary
documentation

Certificate

Certificates and declarations of conformity are available on: www.endress.com/download. The
number of the NEPSI certificate that applies to the product can be found on the nameplate.

Identification

The nameplate provides you with the following information on your device:• Manufacturer identification• Extended order code
• Serial number• Safety information and warnings• Ex marking on hazardous area versions‣ Compare the information on the nameplate with the order.
Type code
TypeVersion- NA****a 2)***xLS16E- NA*******+*xLS21E- NA*******+*xLS82E

- NA

**

*****+*xLS15E

1)

NEPSI Ex ia IIC T3/T4/T6 Ga1)
2)+*No Ex relevance

x=C, O, OC
a = A, B

Certificates and approvals
Ex approval
The CLSxxE-type conductivity sensors, have been certified by the National Supervision andInspection Centre for Explosion Protection and Safety of Instrumentation (NEPSI). These products
meet the following standards:• GB 3836.1 Explosive atmospheres-Part 1: Equipment-General requirements• GB 3836.4 Explosive atmospheres-Part 4: Equipment protection by intrinsic safety "i"• GB 3836.20 Explosive atmospheres-Part 20: Equipment with equipment protection level (EPL) Ga
Please find the current versions of standards on the certificate.
NEPSI Ex ia IIC T3/T4/T6 Ga

Safety instructions

4

The CLSxxE-type conductivity sensors are suitable for use in explosion-hazardous areas.

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Memosens CLS15E, CLS16E, CLS21E, CLS82E

XA02543C• xLS15E, xLS16E, xLS21E: Metallic process connection parts have to be mounted electrostaticallyconductive at the mounting location (< 1 MΩ).
• xLS15E and xLS21E with non-metallic process connection may only be used in liquid media with aconductivity of at least 10 nS/cm.
• xLS15E with non-metallic process connection may not be operated on processing conditions, inwhich an electrostatic loading of the sensor and in particular of the electrically separated outerelectrode, could be expected to occur.
• xLS82E: The sensor may not be operated in electrostatically critical processing conditions. Intensevapour or dust flows directly impacting on the connection system must be avoided. The metallic
parts of the sensor have to be mounted at the mounting location electrostatically conductive(< 1 MΩ).
With the Pg 13.5 version, this condition is already fulfilled by the pre-assembled conductive oring.
• The end user must adhere to the Operating Instructions and the following standards for theinstallation, operation and maintenance of the product:• GB 50257 "Code for construction and acceptance of electric device for explosion atmospheres
and fire hazard electrical equipment installation engineering".
• GB 3836.13 "Explosive atmospheres - Part 13: Equipment repair, overhaul and reclamation"• GB/T 3836.15 "Explosive atmospheres - Part 15: Electrical installations design, selection anderection"• GB/T 3836.16 "Explosive atmospheres - Part 16: Electrical installations inspection andmaintenance"• GB/T 3836.18 "Explosive atmospheres - Part 18: Intrinsically safe electrical systems"
Please find the current versions of standards on the certificate.
• The correlations between the device model, the temperature class, the process temperature range
and the ambient temperature range are indicated in the temperature tables.

Temperature tables

Sensor type

CLS15E-******A***+*

CLS15E-******B***+*

CLS16E-*********+*

CLS21E-*********+*

CLS82E-*********+*

T-Class

Tp (process)Ta (ambient)

min.

max.

max.

T3-20 °C

135 °C

60 °C

T4-20 °C

120 °C

60 °C

T6-20 °C

70 °C

60 °C

T3-20 °C

135 °C

60 °C

T4-20 °C

100 °C

60 °C

T6-20 °C

50 °C

60 °C

T3-5 °C

135 °C

60 °C

T4-5 °C

115 °C

60 °C

T6-5 °C

65 °C

60 °C

T3-20 °C

135 °C

60 °C

T4-20 °C

115 °C

60 °C

T6-20 °C

65 °C

60 °C

T3-20 °C

140 °C

60 °C

T4-20 °C

120 °C

60 °C

T6-20 °C

70 °C

60 °C

The above temperature table applies only under the following installation conditions, which aredescribed in the following graphic →  1. If the installation conditions cannot be met, themaximum process temperature Tp must not exceed the maximum ambient temperature Ta.

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Connection

Memosens CLS15E, CLS16E, CLS21E, CLS82EEx specification
The CLSxxE-type conductivity sensors are approved and are suitable for use in explosion-hazardous
environments.
• The approved CLSxxE-type digital conductivity sensors have an intrinsically safe input with thefollowing parameter set:
Pi = 180 mW• The approved CLSxxE-type digital conductivity sensors may only be connected to a Memosens
cable or a compact transmitter with an intrinsically safe output with the following parameter set:
P0 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 Tp
Ambient temperature Ta

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