XA02113C/07/EN/02.21
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2021-08-20

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Safety Instructions
Memosens pH/ORP sensors
pH and ORP measurement
Supplement to: BA01988C, BA02142C
Safety instructions for electrical apparatus in
explosion-hazardous areas
NEPSI Ex ia IIC T3/T4/T6 Ga
NEPSI Ex ia IIC T4/T6 Ga

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Memosens pH/ORP sensors

XA02113C

Memosens pH/ORP sensors
pH and ORP measurement
Table of contents
Associated documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Supplementary documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Temperature tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installation conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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Associateddocumentation

Memosens pH/ORP sensors

This document is an integral part of Operating Instructions BA01988C.
This document is an integral part of Operating Instructions BA02142C.

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

Supplementary
documentationCertificates

NEPSI certificate of conformity, certificate number: GYJ19.1375X

Identification

The nameplate provides you with the following information on yourdevice:• Manufacturer identification• Order code
• Extended order code
• Serial number• Safety information and warnings• Ex labeling on hazardous area versions‣ Compare the information on the nameplate with the order.
Type code
TypeVersion

CPS11E NA
CPS12ECPS16ECPS41ECPS42E
CPS61E
CPS62E
CPS71E
CPS72E
CPS76ENEPSI Ex ia
IIC T3/T4/T6Ga4*******b+*b denotes the shaft length (< 600 mm (23.6 in) no Ex relevance)

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Memosens pH/ORP sensors

XA02113C

TypeVersion

CPS31E NA
CPS91E
CPS92ECPS96ENEPSI Ex ia
IIC T4/T6 Ga*******b+*b denotes the shaft length (< 600 mm (23.6 in) no Ex relevance)

Certificates and approvals
Ex approvals
The Memosens pH/ORP sensors, type CPSaaE-******b+*, have beencertified by the National Supervision and Inspection Centre for
Explosion Protection and Safety of Instrumentation (NEPSI). Theseproducts meet 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 withequipment protection level (EPL) Ga
CPS11E/CPS12E/CPS16E/CPS41E/CPS42E/CPS61E/CPS62E/CPS71E/CPS72E/CPS76E:
NEPSI Ex ia IIC T3/T4/T6 Ga
CPS31E/CPS91E/CPS92E/CPS96E:
NEPSI Ex ia IIC T4/T6 Ga

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Safetyinstructions

Memosens pH/ORP sensors• It is not permitted to operate the sensor under electrostatically criticalprocess conditions. Significant vapor and dust clouds, which have adirect impact on the Memosens sensor head, must be avoided.
• Ex-protected digital sensors with Memosens technology are
identified by an orange-red ring on the terminal head.
• The procedures for electrical connection described in the Operating
Instructions must be followed.
• In order to maintain and guarantee the explosion protection of thedevice, the user may not modify the configuration in any way. Everychange can compromise the safety of the device.
• The end user must adhere to the Operating Instructions and thefollowing standards for the installation, operation and maintenanceof the product:• GB 50257-2014 "Code for construction and acceptance of electric
device for explosion atmospheres and fire hazard electricalequipment installation engineering".
• GB 3836.13-2013 "Explosive atmospheres - Part 13: Equipment
repair, overhaul and reclamation"• GB/T 3836.15-2017 "Explosive atmospheres - Part 15: Electricalinstallations design, selection and erection"• GB/T 3836.16-2017 "Explosive atmospheres - Part 16: Electricalinstallations inspection and maintenance"• GB/T 3836.18-2017 "Explosive atmospheres - Part 18: Intrinsicallysafe electrical systems"
The correlations between the device model, the temperature class, theprocess temperature range and the ambient temperature range areindicated in the temperature tables →  6.

TemperaturetablesSensorTemperatureclass

Process temperature Tp

Ambient temperature Ta

CPS11ECPS12ECPS16ECPS41ECPS42E
CPS72ET3–15 °C (5 °F)≤ Tp ≤135 °C (275 °F)–15 °C (5 °F) ≤ Ta ≤70 °C (158 °F)

T4–15 °C (5 °F) ≤ Tp ≤120 °C (248 °F)–15 °C (5 °F) ≤ Ta ≤75 °C (167 °F)–15 °C (5 °F) ≤ Tp ≤110 °C (230 °F)–15 °C (5 °F) ≤ Ta ≤80 °C (176 °F)–15 °C (5 °F) ≤ Tp ≤100 °C (212 °F)–15 °C (5 °F) ≤ Ta ≤85 °C (185 °F)–15 °C (5 °F) ≤ Tp ≤90 °C (194 °F)–15 °C (5 °F) ≤ Ta ≤90 °C (194 °F)–15 °C (5 °F) ≤ Tp ≤70 °C (158 °F)–15 °C (5 °F) ≤ Ta ≤70 °C (158 °F)

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Memosens pH/ORP sensors

XA02113CSensorTemperature
class

Process temperature Tp

Ambient temperature Ta

CPS61E
CPS62E
CPS71E
CPS76E

T30 °C (32 °F) ≤ Tp ≤140 °C (284 °F)

0 °C (32 °F) ≤ Ta ≤70 °C (158 °F)

T40 °C (32 °F) ≤ Tp ≤120 °C (248 °F)

0 °C (32 °F) ≤ Ta ≤75 °C (167 °F)

0 °C (32 °F) ≤ Tp ≤110 °C (230 °F)

0 °C (32 °F) ≤ Ta ≤80 °C (176 °F)

0 °C (32 °F) ≤ Tp ≤100 °C (212 °F)

0 °C (32 °F) ≤ Ta ≤85 °C (185 °F)

0 °C (32 °F) ≤ Tp ≤90 °C (194 °F)

0 °C (32 °F) ≤ Ta ≤90 °C (194 °F)

T60 °C (32 °F) ≤ Tp ≤70 °C (158 °F)

0 °C (32 °F) ≤ Ta ≤70 °C (158 °F)

T40 °C (32 °F) ≤ Tp ≤80 °C (176 °F)

0 °C (32 °F) ≤ Ta ≤90 °C (194 °F)

T60 °C (32 °F) ≤ Tp ≤70 °C (158 °F)

0 °C (32 °F) ≤ Ta ≤70 °C (158 °F)

T40 °C (32 °F) ≤ Tp ≤110 °C (230 °F)

0 °C (32 °F) ≤ Ta ≤80 °C (176 °F)

0 °C (32 °F) ≤ Tp ≤100 °C (212 °F)

0 °C (32 °F) ≤ Ta ≤85 °C (185 °F)

0 °C (32 °F) ≤ Tp ≤90 °C (194 °F)

0 °C (32 °F) ≤ Ta ≤90 °C (194 °F)

0 °C (32 °F) ≤ Tp ≤70 °C (158 °F)

0 °C (32 °F) ≤ Ta ≤70 °C (158 °F)

CPS31E

CPS91E
CPS92ECPS96E

T6

The temperature table above applies only under the following
installation conditions, which are described in the following graphic→  8. If the installation conditions cannot be met, the maximum
process temperature Tp must not exceed the maximum ambient
temperature Ta.

Connection

Ex specification• The pH/ORP sensors of model series CPSaaE******b+* are approved
according to NEPSI certificate GYJ19.1375X and is suitable for use inhazardous environments.
• The approved digital pH/ORP sensors of model series CPSaaE******b+* have an intrinsically safe input with the following parameter set:Endress+Hauser

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XA02113C

Memosens pH/ORP sensors

ParameterValuePi

180 mW

The approved digital pH/ORP sensors of model series CPSaaE******b+* must be connected to a Memosens cable or a cable transmitter withan intrinsically safe output with the following parameter:Parameter

ValuePoMaximum 180 mW

Installation
conditions

4> 37 (1.46)

213A0041281

112348

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