XA01687C/07/EN/06.23-00
71621874
2023-07-14

Products

Solutions

Safety Instructions
Liquiline CM42
Two-wire transmitter for hazardous areas
FM IS NI Cl.I Div.1&2, Groups A-D
CSA IS NI Cl.I,II,III Div.1&2, Groups A-G

1

Services

XA01687C

Liquiline CM42

Liquiline CM42
Two-wire transmitter for hazardous areas
Table of contents
Associated documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Connection requirements for the USA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3Connection requirements for Canada . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CM42 Connectable sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

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Liquiline CM42

XA01687C

Associated documentation

This document is an integral part of Operating Instructions BA00382C.

Connection requirements for
the USA

Note: In addition to the information provided in this control drawing, the FM labelled measurementtransmitter CM42 and the cCSAus labelled sensors covered and referenced by this section may beconnected and used with transmitters and sensors listed in control drawing no. 139689, based on
certificate no. FM16US0145X issued by FM.
Equipment Ratings valid for the USA
Intrinsically Safe for Class I, Division 1, Groups A, B, C and D; Class I, Zone 1, AEx ib [ia Ga] IIC;
Type 4, IP66/67
Non Incendive for Class I, Division 2; Groups A, B, C and D; Class I, Zone 2, Group IIC with
Nonincendive field wiring connections to Class I, Division 2, Group A, B, C, and D and Class I, Zone 2,
Groups IIC, Type 4; IP66/67
Ambient:-20 °C < Ta < +50 °C(T6)
Devices using 4-20mA / HART outputs
Intrinsically safe (Entity), Class I, Div. 1 Groups A, B, C, D Hazardous location installations
1.

Control room equipment may not use or generate over 250 Vrms.

2.

Use entity-approved intrinsic safety barrier or other associated equipment with Voc or Vf ≤Vmax, Isc or If ≤ Imax, Ca ≥ Ci + Ccable, La ≥ Li + Lcable.

Entity parameters are as follows (current controlled circuits):
Terminals

Vmax

Imax

Pmax

Ci

Li

133 and 134

30 V

100 mA

800 mW

1.2 nF

29 μH

233 and 234

30 V

100 mA

800 mW

0.2 nF

24 μH

3.

Installation should be in accordance with ANSI/ISA RP12.06.01 "Installation of Intrinsically
Safe Systems for Hazardous (Classified) Locations" and the National Electric Code (ANSI/NFPA70).

4.

NOTICE
Substitution of components may impair intrinsic safety!
‣ Observe.

5.

Ex ia is defined as Intrinsically Safe.

Division 2 and Zone 2 installation (current controlled circuit)
6.

The nonincendive field wiring circuit concept allows interconnection of nonincendive fieldwiring apparatus with associated nonincendive field wiring apparatus, using any of the wiring
methods permitted for unclassified locations.

Entity parameters are as follows (current controlled circuits):
Terminals
133 and 134
233 and 234

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Vmax

Imax

Ci

Li

30 V

1)

1.2 nF

29 μH

30 V

1)

0.2 nF

24 μH

1)

For this current controlled circuit, the parameter (Imax) is not required and need not be aligned withparameter (Isc or It) of the barrier or associated nonincendive field wiring apparatus.

7.

Vmax ≥ Voc or Vt , Ca ≥ Ci + Ccable, La ≥ Li + Lcable8.

Installation shall be in accordance with the NEC.

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XA01687C

Liquiline CM42

9.

NOTICE
Substitution of components may impair suitability for class I division 2 or class I zone 2!
‣ Observe.

Functional ratings
These ratings do not supersede hazardous locations values.
Normal current = 3.6 to 22 mA
Normal voltage = 12.5 to 30 V

Class I, Div. 2, Groups A, B, C, D
Class I, Div. 1, Groups A, B, C, D
Class I, Zone 1, 2, IIC

Current controlled circuit

133
134

233
234

234 233 232 231 134 133 132 131

Hazardous location

Non hazardous location
Barrier/associated equipment
or approved associated NI. fieldwiring apparatus

+
–

+
–

+

+
-

external loop

-

+
-

+
-

4...20 mA loop
4...20 mA loop 2

supplySee section "CM42 connectable sensors"
A0036350

Devices using PROFIBUS and FOUNDATION FIELDBUS outputs
FISCO-Concept
The FISCO concept allows interconnection of intrinsically safe apparatus to associated apparatus not
specifically examined in such combination.
The criteria for interconnection is that the voltage (Ui or Vmax), the current (Ii or Imax) and the power(Pi or Pmax) which intrinsically safe apparatus can receive and remain intrinsically safe, considering
faults, must be equal or greater than the voltage (Uo or Voc or Vt), the current (Io or Isc or It) and thepower (Po or Pmax) levels which can be delivered by the associated apparatus, considering faults andapplicable factors. In addition, the maximum unprotected capacitances (Ci) and inductances (Li) of
each apparatus (other than the termination) connected to the fieldbus must be less than or equal to
5 nF and 10 μH respectively.
In each segment, only one active device, normally the associated apparatus, is allowed to provide thenecessary energy for the fieldbus system.
The voltage (Uo or Voc or Vt) of the associated apparatus has to be limited to the range of 14 V to
17.5 VDC. All other equipment connected to the bus cable has to be passive, meaning that they are
not allowed to provide energy to the system, except to a leakage current of 50 μA for each connected
device. Separately powered equipment needs a galvanic isolation to assure the intrinsically safe
fieldbus circuit remains passive.
The cable used to interconnect the devices needs to have the parameters in the following range:
loop resistance R':
15 ... 150 Ω/km
inductance per unit length L':
0.4 ... 1 mH/km
capacitance per unit length C':
80 ... 200 nF/km
C' = C' line/line + 0.5C' line/screen, if both lines are floating or
C' = C' line/line + C' line/screen, if the screen is connected to one line
length of spur cable:≤ 30 mlength of trunk cable:≤ 1 kmlength of splice:≤1m

4

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Liquiline CM42

XA01687C

At the end of the trunk cable an approved infallible line termination with the following parameters issuitable:R = 90 ... 100 Ω
C = 0 ... 2.2 μF.
One of the allowed terminations might already be integrated in the associated apparatus.
The number of passive devices connected to the bus segment is not limited due to I.S. reasons. If theabove rules are respected, up to a total length of 1000 m (sum of the length of trunk cable and all
spur cables), the inductance capacitance of the cable will not impair the intrinsic safety of theinstallation.
NONINCENDIVE CLASS 1, DIV.2, GROUP A.B.C.D HAZARDOUS LOCATION INSTALLATION
1.

Install per national electric code (NEC) using threaded metal conduit. Intrinsic safety barrier
not required. Max. supply voltage 30 V. For T-code see table.

2.

LWARNING
Explosion Hazard!

‣ Do not disconnect equipment unless power has been switched off or the area is known to
be Non Hazardous.

NOTICE
Substitution of components may impair suitability for CLASS I, Division 2!
‣ Observe.

Non hazardous location

Hazardous (classified) location
Class I, Zone 0, 1, 2 Groups
IIC T6Class I, Div. 1, 2, Groups A,
B, C, DRCAny
FM approved
termination
with
R= 90 ... 100 W
C= 0 ... 22 µF

NI Class I, Div. 2, Groups A, B, C, D
IS Class I, Zone 1, 2, Groups IIC T6
IS Class I, Div. 1, Groups A, B, C, D
Ta = –20 °C ... +50 °C (–4 ... 122 °F)

Liquiline M CM42- output
for PROFIBUS PA or
FOUNDATION Fieldbus
Ui (Vmax)
Ii (Imax)
Pi (Pmax)Ci
Li
Leakage current£ 17.5 V£ 380 mA
£ 5.32 W£ 5 nF£ 10 µH£ 50 µA

Temperatureclassification

T6

Max. ambient
temperature

50 °C
122 °F

Any FMapprovedassociatedapparatus
suitable for
FISCO
concept

997

997

998

998

Any
FM approved
intrinsically safe
apparatus
suitable for
FISCO
concept

PROFIBUS or
FOUNDATION Fieldbus
terminal

FM controlled
drawing,
no changes
without
prior approval!

A0045991

For sensor connection: →  11

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XA01687C

Connection requirements for
CanadaLiquiline CM42

Note: In addition to the information provided in this control drawing, the CSA labelled measurementtransmitter CM42 and the cCSAus labelled sensors covered and referenced by this section may beconnected and used with transmitters and sensors listed in control drawing no. 139711, based on
certificate no. 1718339 issued by CSA.
Equipment Ratings valid for Canada
Class I, Division 1, Groups A, B, C, D; Class II, Groups E, F, G, Class III, Type 4; IP66/67
Class I, Division 2, Groups A, B, C and D, Type 4; IP66/67
Ambient:-20 °C < Ta < +50 °C(T6)-20 °C < Ta < +55 °C(T4)
Devices using 4-20mA / HART outputs
Transmitter Intrinsically Safe and Non-incendive Entity Parameters:
Terminals

Vmax

Imax

Ci

Li

133 and 134

30 V

100 mA

1.2 nF

29 μH

233 and 234

30 V

100 mA

0.2 nF

24 μH

Notes for CL. I, II and III Intrinsically Safe Installation:
1.

Install per the Canadian Electrical Code, Part I.

2.

Control room equipment connected in the non-hazardous location must not use or generate
voltages greater than 250 Vrms.

3.

4-20 mA circuit(s) must be connected to Certified Associated Equipment where the following
conditions are met for each loop: Voc ≤ Vmax, Isc ≤ Imax, Ca ≥ Ci + Ccable, La ≥ Li + Lcable.

4.

Each 4-20 mA circuit must use twisted, shielded pairs. Cable insulation and shielding must be
maintained to within 10 mm from terminal block connection.

5.

Sensor wiring is intrinsically safe for connection to the specified sensors.

Notes for CL. I, Div.2 Non-incendive Field Wiring Installation:
1.

Install per the Canadian Electrical Code, Part I.

2.

Control room equipment connected in the non-hazardous location must not use or generate
voltages greater than 250 Vrms.

3.

4-20mA circuit(s) must be connected to Certified Associated Equipment (I.S. barriers) or
Certified equipment that provides non-incendive field wiring circuits where the following
conditions are met for each loop: Voc ≤ Vmax, Isc ≤ Imax, Ca ≥ Ci + Ccable, La ≥ Li + Lcable (The 4-20
mA loops are current controlled circuits and therefore the Isc parameter and Imax parameter
need not be aligned.).

4.

Each 4-20 mA circuit must use twisted, shielded pairs. Cable insulation and shielding must be
maintained to within 10mm from terminal block connection.

5.

Sensor wiring is non-incendive field wiring for connection to the specified sensors.

Notes for CL. I, Div. 2 Installation:

6

1.

Install per the Canadian Electrical Code, Part I.

2.

4-20 mA circuits must be installed using CL. I, Div. 2 wiring methods.

3.

Only cable entry thread NPT ½" is applicable.

4.

Sensor wiring is non-incendive field wiring for connection to the specified sensors.

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Liquiline CM42

XA01687CNI Class I, Div. 2, Groups A, B, C, D
IS Class I, Div. 1, Groups A, B, C, D
Class II, Div. 1, Groups E,F,GClass III

Current controlled circuit

133
134

233
234

234 233 232 231 134 133 132 131

Hazardous location

Non hazardous location
Barrier/associated equipment
or approved associated NI. fieldwiring apparatus

+
–

+
–

+

+
-

external loop

-

+
-

+
-

4...20 mA loop
4...20 mA loop 2

supplySee section: "CM42: Connectable sensors"
A0036353

Devices using PROFIBUS and FOUNDATION FIELDBUS outputs
PROFIBUS PA and FOUNDATION Fieldbus Installation in Class I, Div 1, GROUP A, B, C, D
Hazardous Locations
FISCO-Concept
The FISCO concept allows interconnection of intrinsically safe apparatus to associated apparatus not
specifically examined in such combination.
The criteria for interconnection is that the voltage (Ui or Vmax), the current (Ii or Imax) and the power(Pi or Pmax) which intrinsically safe apparatus can receive and remain intrinsically safe, considering
faults, must be equal or greater than the voltage (Uo or Voc or Vt), the current (Io or Isc or It) and thepower (Po or Pmax) levels which can be delivered by the associated apparatus, considering faults andapplicable factors. In addition, the maximum unprotected capacitances (Ci) and inductances (Li) of
each apparatus (other than the termination) connected to the fieldbus must be less than or equal to
5 nF and 10 μH respectively.
In each segment, only one active device, normally the associated apparatus, is allowed to provide thenecessary energy for the fieldbus system.
The voltage (Uo or Voc) of the associated apparatus has to be limited to the range of 14 V to 24 V DC.
All other equipment connected to the bus cable has to be passive, meaning that they are not allowed
to provide energy to the system, except to a leakage current of 50 μA for each connected device.
Separately powered equipment needs a galvanic isolation to assure the intrinsically safe fieldbus
circuit remains passive.
The cable used to interconnect the devices needs to have the parameters in the following range:
loop resistance R':
15 ... 150 Ω/km
inductance per unit length L':
0.4 ... 1 mH/km
capacitance per unit length C':
80 ... 200 nF/km
C' = C' line/line + 0.5C' line/screen, if both lines are floating or
C' = C' line/line + C' line/screen, if the screen is connected to one line
length of spur cable:≤ 30 mlength of trunk cable:≤ 1 kmlength of splice:≤1m
At the end of the trunk cable an approved infallible line termination with the following parameters issuitable:R = 90 ... 100 Ω
C = 0 ... 2.2 μF.
One of the allowed terminations might already be integrated in the associated apparatus.
One of the allowed terminations might already be integrated in the associated apparatus. The
number of passive devices connected to the bus segment is not limited due to I.S. reasons. If theabove rules are respected, up to a total length of 1000 m (sum of the length of trunk cable and all
spur cables), the inductance capacitance of the cable will not impair the intrinsic safety of theinstallation.

‣ Install per the Canadian Electrical Code, Part I for intrinsically safe field wiring.

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XA01687C

Liquiline CM42

Non hazardous location

Hazardous (classified) location
Class I, Div. 1, Groups A, B, C, D

R

CM42- output
for PROFIBUS PA or
FOUNDATION Fieldbus

C
Any approved
termination with
R= 90 ... 100 W
C= 0 ... 22 µF£ 17.5 V£ 380 mA
£ 5.32 W£ 5 nF£ 10 µH£ 50 µA

Ui (Vmax)
Ii (Imax)
Pi (Pmax)Ci
Li
Leakage current

Any approved
associatedapparatus
suitable for
FISCO
concept

Temperature Ambient temperatureclassification
T4
T6-20 to 55 °C (-4 to 131 °F)-20 to 50 °C (-4 to 122 °F)

997

997

998

998

Any approved
intrinsically safe
apparatus
suitable for
FISCO
concept

PROFIBUS or
FOUNDATION Fieldbus
terminal

A0036355

For sensor connection: →  11
PROFIBUS PA and FOUNDATION FIELDBUS INSTALLATION IN CLASS I, DIV 2, GROUP A, B, C, D
HAZARDOUS LOCATIONSThe FNICO concept allows interconnection of non-incendive apparatus to associated apparatus not
specifically examined in such combination.
The criteria for interconnection is that the voltage (Ui or Vmax), the current (Ii or Imax) and the power(Pi or Pmax) which non-incendive apparatus can receive and remain non-incendive, considering
faults, must be equal or greater than the voltage (Uo or Voc), the current (Io or Isc) and the power (Poor Pmax) levels which can be delivered by the associated apparatus, considering faults and applicablefactors. In addition, the maximum unprotected capacitances (Ci) and inductances (Li) of eachapparatus (other than the termination) connected to the fieldbus must be less than or equal to 5 nF
and 20 μH respectively.
In each segment, only one active device, normally the associated apparatus, is allowed to provide thenecessary energy for the fieldbus system.
The voltage (Uo or Voc) of the associated apparatus has to be limited to the range of 14 V to 24 V DC.
All other equipment connected to the bus cable has to be passive, meaning that they are not allowed
to provide energy to the system, except to a leakage current of 50 μA for each connected device.
Separately powered equipment needs a galvanic isolation to assure the non-incendive fieldbus circuit
remains passive.

8

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Liquiline CM42

XA01687C

The cable used to interconnect the devices needs to have the parameters in the following range:
loop resistance R':
15 ... 150 Ω/km
inductance per unit length L':
0.4 ... 1 mH/km
capacitance per unit length C':
80 ... 200 nF/km
C' = C' line/line + 0.5C' line/screen, if both lines are floating or
C' = C' line/line + C' line/screen, if the screen is connected to one line
length of spur cable:≤ 30 mlength of trunk cable:≤ 1 kmlength of splice:≤1m
At the end of the trunk cable an approved infallible line termination with the following parameters issuitable:R = 90 ... 100 Ω
C = 0 ... 2.2 μF.
One of the allowed terminations might already be integrated in the associated apparatus.
One of the allowed terminations might already be integrated in the associated apparatus. The
number of passive devices connected to the bus segment is not limited due to N.I. reasons. If theabove rules are respected, up to a total length of 1000 m (sum of the length of trunk cable and all
spur cables), the inductance capacitance of the cable will not impair the non-incendive installation.

‣ Install per the Canadian Electrical Code, Part I for non-incendive field wiring.
CLASS I, DIV 2, GROUP A, B, C, D HAZARDOUS LOCATION INSTALLATION.
1.

Install per the Canadian Electrical Code, Part I.

2.

Bus wiring must be installed using CLASS I, DIV 2 wiring methods.

3.

Only cable entry thread NPT ½" is applicable.

4.

Associated apparatus suitable for FNICO is not required. Max. supply voltage 32 V.

5.

LWARNING
Explosion Hazard!
‣ Do not disconnect equipment unless power has been switched off or the area is known to
be Non Hazardous.
NOTICE
Substitution of components may impair suitability for CLASS I, Division 2!
‣ Observe.
Sensor wiring is non-incendive field wiring for connection to specified sensors (→  11).

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XA01687C

Liquiline CM42

Non hazardous location

Hazardous (classified) location
Class I, Div. 2, Groups A, B, C, DRC
Any approved
termination with
R= 90 ... 100 W
C= 0 ... 22 µF

CM42- output for PROFIBUS PA
or FOUNDATION Fieldbus
DIV 2

Ui (Vmax)
Ii (Imax)
Pi (Pmax)Ci
Li
Leakage current

FNICO

without
FNICO£ 17.5 V£ 380 mA
£ 5.32 W£ 5 nF£ 10 µH£ 50 µA£ 32 V

Temperatureclassification

Ambient temperature

T4–20...+55 °C(–4...131 °F)

T6–20...+50 °C –10...+50 °C(–4...122 °F) (14...122 °F)

Any approved
associatedapparatus

997

997

998

998

Any approved
non-incendive
apparatus

PROFIBUS or
FOUNDATION Fieldbus
terminal

A0036357

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Liquiline CM42

CM42 Connectable sensors

XA01687C

For devices using 4-20mA / HART, PROFIBUS and FOUNDATION FIELDBUS outputs.

max. cable
length:
CLS50-S
180 !
(55 m)
CLS54-O
160 !(50 m)
Inductive
conductivity sensor
CLS50-S
CLS54-O

187
188
197
198

BK

max. cable
length:165 ft(50 m)

BN

BN
WH
GN
YE

max. cable
length:330 ft(100 m)

112
113
111
315
316
320
318

max. cable
length:330 ft(100 m)

GN
WH
YE

112
113
111

RD
BN
BK

320
318
317

319 317 318 320 316 315 111 113 112

GN
WH
YE

319 317 318 320 316 315 111 113 112

112
113
111
219
220

588 587 388 387 198 197 188 187

RD
RD
GN
WH
YE
WH
WH

221 222 220 219 111 113 112

215
216
112
113
111
218
217

217 218 111 113 112 216 215

Hazardous Location
Class I, Division 1, Groups A, B, C, D
Class II, Groups E, F, G
Class III

GN
WH
YE

BN
BK

max. cable
length:330 ft(100 m)BN

PM

Interface FSDG1 forMemosens devices

Conductive
conductivity sensors
CLS12/13
Details see at
CLS15/16"Digital sensor interface"
CLS21
or other simple apparatus

pH ISFET sensors
CPS441/471/491

pH electrodes
CPS11/13/41/64/71/91
CPF81-...1A/1C
ORP electrodes
CPS12/42/72/92,
CPF82-...A
Temperature
CTS1-A2GSA/A2ZSA,
CTS1-D2GFB

Remark:
CLS54-O only for
installations in the USA
Hazardous Location
Class I, Division 1, Groups A, B, C, D

or other simple
apparatus
A0053356‣ Sensors shall not be operated in dust-ex-area. Only the transmitter can be used in dust-ex-areaof Class II, groups E, F, G and Class III.

‣ Install a separation wall between gas-ex and dust-ex area.
Digital sensor interface

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Terminals

187-188, 197-198

Maximum output voltage Uo

5.04 V

Maximum output current Io

80 mA

Maximum output power Po

112 mW

Effective internal capacitance Ci

12,400 nF (only internally, not effective)

Effective internal inductance Li

160.4 µH (only internally, not effective)

11

XA01687C

Liquiline CM42

Analog pH or ORP sensors
Glass

ISFET

Max. output voltage Uo

10.08 V

10.08 V

Max. output current Io

4.1 mA

50.7 mA

Max. output power Po

10.2 mW

128 mW

Max. external capacitance Co

250 nF

250 nF

Max. external inductance Lo

1000 µH

1000 µH

Analog sensors with conductive measurement of conductivity
Max. output voltage Uo

10.08 V

Max. output current Io

23 mA

Max. output power Po

57 mW

Max. external capacitance Co

50 nF

Max. external inductance Lo

300 μH

Analog sensors with inductive measurement of conductivity

12

Max. output voltage Uo

10.08 V

Max. output current Io

64 mA

Max. output power Po

128 mW

Max. external capacitance Co

1800 nF

Max. external inductance Lo

100 µH

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Endress+Hauser
CYK10
CYK20

max. cable length 100m
(330 ft)intrinsic safe wiring

Memosens sensors with ﬁxed cable (without CYK10/CYK20)
Digital conductivity sensor CLS50D

Digital pH sensors
xPS11D, xPS41D, xPS71D, PS91D, xPS441D, xPS471D, xPS491D, CPF81D-7...F, xPS171D
Digital combined sensors
xPS16D, xPS76D, xPS96D
Digital ORP sensors
xPS12D, xPS42D, xPS72D, xPS92D, CPF82D-7...F
Digital conductivity sensors
CLS15D, CLS16D, xLS21D, CLS50D, xLS82D
Digital oxygen sensors
COS21D, xOS22D, COS51D, xOS81D
Digital sensor simulators
CYP01D, xYP02D, xYP03D, with battery options Duracell MN1500 or Energizer EN91
x ... C or O or OC

Memosens Sensors

Memosens sensor

Maximum output power
Po = 178 mW

Hazardous location
Class I Division 1, Groups A-D

Uo
Io
Po

DC 5.04 V
80 mA
112 mW(trapezoid output characteristic)
The maximum internal capacity and inductivity of the intrinsically safe output
circuit may not exceed the following maximum values:
Maximum internal capacityCi
14.1 μF
Maximum internal inductivity
Li
237.2 μH

Alternative:
Maximum output voltage
Maximum output current
Maximum output power

Furthermore, the connection to an intrinsically safe output circuit (Ex ia IIC) withthe following maximum values is possible:
Maximum output voltage
Uo
DC 5.1 V
Maximum output current
Io
130 mA
Maximum output powerPo
166 mW(linear output characteristic)
The maximum internal capacity and inductivity of the intrinsically safe output
circuit may not exceed the following maximum values:
Maximum internal capacity
Ci
15 μF
Maximum internal inductivity
Li
95 μH

Measuring cable type CYK10 or CYK20 (L < 100 m) may be connected to thesensor module FSDG1 of the ﬁeld measuring device type CM42

Measurementtransmitter withintrinsic safe digitalsensor interface,i.e. CM42

Ordinary location or hazardous locations(refer to measurement transmitter certification)

Digital sensor connection (Memosens)

Liquiline CM42
XA01687C

A004327413

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71621874

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