MTL Instruments MTL1000 Operating Manual

DRAFT - 08 August 2017

Instruction manual

MTL signal conditioners

November 2018
INM 1000 Rev 8

MTL1000 range

Signal conditioning interfaces

DRAFT - 08 August 2017 DRAFT - 08 August 2017

DECLARATION OF CONFORMITY

A printed version of the Declaration of Conformity has been provided separately within the original shipment of goods. However,
you can find a copy of the latest version at http://www.mtl-inst.com/certificates

ii

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

CONTENTS

DECLARATION OF CONFORMITY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii

1 INTRODUCTION. . ...................................................................1

1.1 General .................................................................................1

2 MTL1000 RANGE DESCRIPTION .......................................................1

2.1 Modules ................................................................................1

2.2 Accessories .............................................................................2

3 INSTALLATION PRECAUTIONS ........................................................3

3.1 General .................................................................................3

3.2 Installation ..............................................................................3

3.2.1 Modules ...........................................................................3

3.2.2 Cabinet and enclosure mounting .........................................................3

4 COMMON SPECIFICATIONS ..........................................................4

5 MODULES .........................................................................5

5.1 MTL1991 Power feed and alarm module .......................................................5

5.2 Current repeaters .........................................................................5

5.2.1 MTL1141 Transmitter repeater power supply ..................................................5

5.2.2 MTL1142 Transmitter repeater power supply with HART .........................................6

5.2.3 MTL1143 Transmitter repeater power supply with HART and repeat output ..........................6

5.2.4 MTL1144 voltage/current input, loop powered isolator ...........................................7

Table 1 MTL1144 switch settings

5.2.5 MTL1145 loop powered current repeater .....................................................7

5.3 MTL1171, 1172 Temperature and MTL1173 Potentiometer converters ................................8

Table 2 Configuration and DIP switch settings

Table 3 MTL1171 and MTL1172 range DIP switch setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

5.3.1 MTL1171 thermocouple input converter .....................................................10

5.3.2 MTL1172 RTD input converter .............................................................10

5.3.3 MTL1173 Potentiometer input converter .....................................................10

5.4 MTL1211 Switch / Proximity Detector input ....................................................11

5.5 MTL1249 Current / Voltage input/output repeater ...............................................11

Table 4 MTL1249 Dip Switch settings

5.6 MTL1271 loop powered thermocouple input converter ...........................................13

5.7 MTL1272 loop powered RTD temperature converter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

6 MTL13XX TRIP AMPLIFIERS .........................................................14

6.1 Introduction ............................................................................14

6.2 Trip level Setting .........................................................................14

6.3 Label Indicators / Switches .................................................................14

6.4 Switch settings ..........................................................................15

Table 1 Trip switch settings . . . . . . . . . . . . . . . . . . . . . .

Table 2 Trip switch MTL137x Configuration and DIP switch settings . . . . . . . . . . . . . . . . . . . . . .

Table 3 MTL1371 and MTL1372 range DIP switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.5 MTL1321 trip amplifier with voltage/current input and 4-20mA output ...............................15

Table 4 MTL1321 SW101 range switch settings . . . . . . . . . . . . . . . . . . . . . .

6.6 MTL1321 trip amplifier with voltage/current input and 4-20mA output . . . . . . . . . . . . . . . . . . . . . .

6.7 MTL1371 trip amplifier converter, thermocouple input/4-20mA output

6.8 MTL1372 trip amplifier converter, RTD input/4-20mA output

6.9 MTL1373 trip amplifier converter, Potentiometer input/4-20mA output

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

. . . . . 15

. . . . . 15

. . . . . . . . . . . . . . . . . . . . 16

. . . . . . . 17

. . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . 17

. . . . . . . 17

. . . . . . . .17

iii

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

7 MAINTENANCE ...................................................................14

7.1 Routine Maintenance .....................................................................14

7.2 Enclosures .............................................................................14

8 APPENDIX A ......................................................................14

Table 1 Isolator current consumption for MTL1991 calculation @ 24V . . . . . . . . . . . . . . . . . . . . . . . . . . 15

iv

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

IMPORTANT NOTE

This manual describes the installation and use of:

• MTL1000 range of isolating interfaces and accessories.

The MTL1000 products are designed to provide signal isolation and signal conversion between
equipment and areas of a process plant.

WARNING!

This equipment must be installed, operated and maintained only by trained

competent personnel and in accordance with all appropriate international, national

and local standard codes of practice and site regulations for process connected

apparatus and in accordance with the instructions contained here.

The following methods are used on the product and in this manual to alert the user
to important information:-

Caution - read the instructions

Caution - hot surface

v

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

MTL1000 range - signal conditioning interfaces

1 INTRODUCTION

1.1 General

This instruction manual describes the procedures for installing, connecting, checking and maintaining MTL1000
range of isolating interfaces and accessories. The MTL1000 products are designed to provide signal isolation and
signal conversion between equipment and areas of a process plant.

Signal isolation eliminates or reduces the risk of earth loops, surges and noise, all of which can result in loss of
signal integrity or damage to equipment. In addition, some modules offer the ability to convert signal types to
provide level compatibility between system components.

2 MTL1000 RANGE DESCRIPTION

The MTL1000 range of modules and accessories is designed for use with process connected systems. It
consists of compact isolating interface modules mounted on 35mm DIN rail. Power is provided through a DIN
rail mounted power bus, to which, the isolator module is plugged into when clipped onto the DIN rail. Power is
supplied to the isolators via a dedicated power feed module which also provides current limit protection in the
event of a fault.

The MTL1000 range modules provide power and status information via LEDs on the top of the module. Where

module configuration is required, then switches are accessed by the user through the side cover.

2.1 Modules

The table below lists the modules in the MTL1000 range:

MTL1991 Power feed and alarm module

MTL1141 Transmitter repeater power supply

MTL1142 Transmitter repeater power supply with HART passthrough

MTL1143 Transmitter repeater power supply with HART passthrough and repeat output

MTL1144 V/I to current repeater, loop powered

MTL1171 Thermocouple input converter

MTL1172 Resistance temperature device (RTD) converter

MTL1173 Potentiometer input converter

MTL1271 Thermocouple input converter, loop powered

MTL1272 RTD converter, loop powered

MTL1211 Switch / Proximity detector input

MTL1249 Signal converter, V/I to V/I

MTL1341 Transmitter repeater with 2ch trip

MTL1321 Trip amplifier with voltage/current input

MTL1371 Trip amplifier with Thermocouple input

MTL1372 Trip amplifier with RTD input

MTL1373 Trip amplifier with Potentiometer input

1

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

2.2 Accessories

PBUS6.2 DIN rail power bus connector for 2

module positions (pack of 10)

PBUS6.2

PBUS17.5 DIN power rail bus connector for 1 module position

(pack of 10)

PBUS17.5

PBUS02

PBUS03 Module end stop

PBUS03

TH1000

TH1300

THR2

2

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

3 INSTALLATION PRECAUTIONS

3.1 General

This equipment must be installed, operated and maintained only by trained competent personnel

and in accordance with all appropriate international, national and local standard codes of practice

and site regulations for apparatus and in accordance with the instructions contained here.

3.2 Installation

3.2.1 Modules

All modules are DIN rail mounted in conjunction with the power bus connector. The power bus

must be installed on the DIN first with the required number of slots for the modules that will be

fitted. Each power bus connector powers 2 isolators. The MTL1991 power feed module, if used,

will occupy one position. This may be located in any position. Power may be connected directly

to the bus using the PBUS02 connector set. These are screw terminals that plug directly into the

power bus at either end of the bus. The power supply should be of the transformer isolated type

to obtain the secondary isolation required for SELV.

Modules are mounted on the DIN rail by clipping the foot, furthest from the release clip,

on to the DINrail first. Rotate the module down onto the DIN rail and clip into place (Fig.1).

To release, use a flatbladed screwdriver to release the module clip (Fig 2), hold module and

rotate clip upwards. (Fig.3)

Fitting module to DIN rail Release clip Module removal

Fig. 1 Fig. 2 Fig. 3

3.2.2 Cabinet and enclosure mounting

The MTL1000 modules must be installed in a cabinet or enclosure with an impact rating of

at least 6.5J. Consideration must be given to the management of the internal temperatures.

Space must be provided around the modules to allow airflow. The optimum transfer of heat

is attained when the DIN rail is mounted horizontally but vertical DIN rails may also be

used where adequate space is available, especially in larger cabinets. Principle sources of

heat, such as power supplies, should be located above the modules. An enclosure depth,

measured from the base of the DIN rail, of at least 150mm is recommended. The absolute

minimum is 115mm.

CAUTION

Exercise care when removing modules in operation from the middle of a

group as the surface temperature on the side faces may be hot.

3

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

4 COMMON SPECIFICATIONS

For individual product specifications please refer to individual product specification sheets.

Terminals

Screw clamp. Conductors of up to 13AWG / 1.8mm dia. stranded or single-core copper.

Max torque 0.4Nm to 0.6Nm. Cable insulation strip /ferrule length 6-8mm

PBUS02 use wire type Solid / Stranded, 28 – 16 AWG / 0.14-1.3mm dia, – copper

Power supply voltage

18V to 32V DC SELV (UL listed where UL is applicable)

Isolation

250V ac or dc between power, field and system circuits.

tested to 1100Vac)

Mounting

T-section 35mm DIN rail (7.5mm or 15mm) to EN 50022

Ambient temperature limits

-20 to +60°C (-6 to +140°F) operating

-40 to +80°C (-40 to +176°F) storage

Humidity

5 to 95% relative humidity

Altitude

<2000m

Weight

6.2mm modules 120g

17.5mm modules 130g

EMC

EN61326 and NE21* Class A equipment

* For 20mS power interruption compliance, a suitable power supply must be used.

Dimensions

100 mm

112 mm

111 mm

6.2 mm

Fig. 1 MTL1000

4

112 mm

111 mm

Fig. 2 MTL1300

100 mm

17.5 mm

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

¾

5 MODULES

5.1 MTL1991 power feed and alarm module

The MTL1991 module is required to feed power to a group of MTL1000 range modules
via the DIN rail power bus. Each power feed module provides reverse voltage protection
and power monitoring. The power monitor relay provides a dry contact output which
may be used for connection into a monitoring system or local indicator.

The number of isolators connected to any one power feed module must be assessed
for power consumption. The maximum load current when feeding power via terminal
5 is 1A. If redundant power inputs are not required then terminal 6 may be used and
a maximum load current of 2 A is acceptable. Check current consumption table in
Appendix A for details. If power is fed directly into terminal 6 and external 3A time delay
fuse must be fitted. Alarm relay contact rating is 40Vrms ac/dc 0.5A, resistive.

Where redundant power feeds are required, two MTL1991 modules are fitted with one
power feed on each. The maximum load current is 1A.

MTL1991

ALARM

1

2

D E

5

6

2A

7

Vs+

Bus supply output

Vs-

V+ supply input 19-32V dc 1A

Direct V+ supply input (max 2A)

V- supply input

5.2 Current repeaters

5.2.1 MTL1141 transmitter repeater power supply

Before installing this modules check the connection requirements on the ‘system’ side
of the module. The output may be configured to source or sink current. Current source
is used when the input to the system is passive, ie there is no power supply present
and it presents a resistive load. Current sink is used mainly with a ‘2 wire’ transmitter
input to the system where ‘loop power’ and ‘input’ terminals are provided. Terminal
6 on the MTL1141 is connected to the transmitter supply, and terminal 5 to the input.
See Fig.4. Switch SW1 on the module must be set prior to installation. The module is
supplied with the switch set in ‘source’ mode.

MTL1141

SW1

Source output

5 +

4-20mA

6

-

Sink output

5

-

6

+

Load

­Power

+

turn

SW1

Source - Sink

Label side of module

Fig. 4 Fig. 5

5

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

5.2.2 MTL1142 transmitter repeater power supply with HART

Before installing this modules check the connection requirements on the ‘system’ side

of the module. The output may be configured to source or sink current. Current source

is used when the input to the system is passive, i.e. there is no power supply present

and it presents a resistive load. Current sink is used mainly with a ‘2 wire’ transmitter

input to the system where ‘loop power’ and ‘input’ terminals are provided. Terminal

6 on the MTL1142 is connected to the transmitter supply, and terminal 5 to the input.

Switch SW1 on the module must be set prior to installation. The module is supplied

with the switch set in ‘source’ mode. HART communications are passed with both

settings. In source mode the input impedance on the system input must be >240Ω for

HART compliance.

SW1

Source - Sink

Load

Output

PWR

+

-

MTL1142

Tx+

1

+

­Input

2

Com

3

D E

Vs- Vs+

5

6

+

4-20mA

-

5.2.3 MTL1143 transmitter repeater power supply with HART and repeat output

Before installing this modules check the connection requirements on the ‘system’ side

of the module. Output 1 is configured to source current into a load and provide HART

communications passthrough.

Output 2 on terminals 7 and 8 generates a repeat 4-20mA signal to another device. This

output provides a 4-20mA ‘source’ current to the system input. HART communication

is not provided via this output.

An active current source may also be applied via terminals 2 and 3. HART

communications are not provided when operating in this mode.

Load

-

+

MTL1143

PWR

+

-

6

Tx+

1

+

­Input

2

Com

3

D E

Vs- Vs+

5

+

4-20mA

6

-

7

+

4-20mA

8

-

Load

Load

Output 1

Output 2

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

5.2.4 MTL1144 voltage/current input, loop powered isolator

The MTL1144 provides an interface to convert voltage or current signals into 4-20mA for
connection to a system analogue input. Switches are used to select the required input
range. The input terminals are chosen depending on signal type, 1 and 2 for voltage
input and 2 and 4 for current input.

The maximum load resistance is dependent on the available power supply voltage.
Max load = 50(Vs-17)

System AI

2 wire Tx

system input

MTL1144

V

1

2

I

I

V/I

4-20mA

I

+

5

I

-

6

Limit

Load

+24V Tx
Power

-ve

Return

CAUTION

Do not connect a low impedance voltage source to terminals 2 and 4, damage

may result.

Note: Signal source must be isolated from mains supply.

Table 1

MTL1144 switch settings

DS1 DS2 DS3 Input Output

OFF OFF OFF 0-1V

ON OFF OFF 0-5V

OFF ON OFF 0-10V

ON ON OFF 1-5V

OFF OFF ON 0-20mA

ON OFF ON 4-20mA

OFF ON ON 0-100mV

4-20mA

7

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

5.2.5 MTL1145 loop powered current repeate2

The MTL1145 can be used for both input and output applications. It is primarily

designed for use with analogue outputs and loop powered from the system

output. Power is taken from the analogue output signal to power the isolator. HART

communication passthrough is not provided by this module.

Current Source

(Analogue Outpt /Input)

I/P converter

/ AI Load

MTL1145

System AO

O/P+

O/P-

System AI

+

-

Alternatively the module can be used in a current sink mode where an analogue output

in the field can be connected to pass a signal into a system input. Power is taken from

the Transmitter power connection on the system and the signal is fed back through the

system input load to 0V.

Current Sink

(Analogue Input)

2 wire

Tx

MTL1145

Input

Power

Input +

System AI

V source

Channel

0V / Return

(24V)

Input

Notes: Greater accuracy is provided when operating in Current Source mode.

Signal source must be isolated from mains supply.

8

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

5.3 MTL1171, 1172 temperature and MTL1173
potentiometer converters

MTL117x

DS1

SW1

DS10

The MTL1171, for thermocouples and MTL1172, for RTD,
convert low level temperature inputs to 4-20mA. The
MTL1173 is for a potentiometer input. Input type and range
setting is performed using switches on the side of the
module.

The sensor types and wire break detection are selected
using switches DS 1-4 and a selection of popular ranges is
available using switches DS 6-9.
See tables 1 and 2.

Current output, voltage output or current sink output is available on the
system terminals by wiring to the appropriate terminals as shown and
setting SW1 to the appropriate position.

Source Sink

SW1

LED indicators show
the power and field
input status

Condition Green (PWR) Red (STS)

Power ON/ Normal ON OFF
Power Low Voltage OFF OFF

Field Open circuit ON Flashing

Module failure ON ON

Configuration and DIP switch settings

Model Input type DS1 DS2 DS3 DS4 DS5

Type Wire Break Wire Break Drive Trip 1 Trip 2

MTL1x71 THC J Off / K On

ON/OFF

MTL1173 POT -

ON = Upscale

OFF = Downscale

N/A N/AMTL1x72 RTD 4W Off 3W On

Table 3

MTL1171 and MTL1172 range DIP switch setting

Range THC/RTD DS6 DS7 DS8 DS9 DS10
0 to 100°C 0 0 0 0 -
0 to 150°C 0 0 0 1 -
0 to 200°C 0 0 1 0 -
0 to 350°C 0 0 1 1 -
0 to 500°C 0 1 0 0 -
0 to 650°C 0 1 0 1 -

0 to 800°C 0 1 1 0 -
0 to 1000°C

0 1 1 1 -

(RTD max 850°C)

-10 to 50°C 1 0 0 0 -

-50 to 50°C 1 0 0 1 -

-50 to 100°C 1 0 1 0 -

-50 to 150°C 1 0 1 1 -

-50 to 250°C 1 1 0 0 -

-50 to 350°C 1 1 0 1 -

-200 to 600°C 1 1 1 0 -
Special (Reserved) 1 1 1 1 -

Note: Cycle power supply after setting switched

9

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

5.3.1 MTL1171 thermocouple input converter

For Type J or K thermocouples. Cold junction compensation is provided by the MTL1171.

Switch settings select open wire detection and up/down scale drive.

MTL1171

5.3.2 MTL1172 RTD input converter

For PT100 RTD sensors. Switch settings select 3 or 4 wire connection and open wire

detection with up/down scale drive.

MTL1172

5.3.3 MTL1173 potentiometer input converter

Potentiometer Input. Switch settings select open wire detection with up/down
scale drive.

Potentiometer

input

MTL1173

1

3

4-20mA

1-5V

System AI

Current

2 wire Tx

system input

input

Source Sink

+

5

-

62

+

7

-

8

+

-

+

Channel

-

Load

Voltage

input

SW1

Load

Limit

-ve

Return

+24V Tx

Power

ED

+24V

10

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

MTL1211

Output

Repeat/LFD

+24V

+

_

680Ω

22kΩ

On

LFD PR

MTL1249

ED

5

6

2

1

7

8

+

-

+

-

Load

System AI

+

-

Current

input

Voltage

Channel

input

+24V Tx
Power

Limit

2 wire Tx

system input

-

+

SW1

Source Sink

Load

-ve

Return

+24V

V/I

V/I

I

V

V

I

I

5.4 MTL1211 Switch / Proximity Detector input

Switch or proximity detector isolator with the option to select line fault detection or a

repeat output Switches are used to select phase reversal and the repeat output or LFD

alarm output .

5.5 MTL1249 Current / Voltage input/output repeater

The MTL1249 is a single channel signal conditioner which can accept voltage or current

inputs and provide a voltage or current output. The signal levels are selected by the user

using switches on the module as shown in the table 3.

11

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

Table 4 MTL1249 Dip Switch settings

INPUT DS1 DS2 DS3 DS4 DS5 DS6 INPUT

OFF OFF OFF OFF OFF OFF 0-1V

Voltage

Current

Voltage

Current

Voltage

Current

Voltage

Current

Voltage

Current

Voltage

Current

Voltage

ON OFF OFF OFF OFF OFF 0-5V

OFF ON OFF OFF OFF OFF 0-10V

ON ON OFF OFF OFF OFF 1-5V

OFF OFF ON OFF OFF OFF 0-20mA

ON OFF ON OFF OFF OFF 4-20mA

OFF ON ON OFF OFF OFF 0-1V

ON ON ON OFF OFF OFF 0-5V

OFF OFF OFF ON OFF OFF 0-10V

ON OFF OFF ON OFF OFF 1-5V

OFF ON OFF ON OFF OFF 0-20mA

ON ON OFF ON OFF OFF 4-20mA

OFF OFF ON ON OFF OFF 0-1V

ON OFF ON ON OFF OFF 0-5V

OFF ON ON ON OFF OFF 0-10V

ON ON ON ON OFF OFF 1-5V

OFF OFF OFF OFF ON OFF 0-20mA

ON OFF OFF OFF ON OFF 4-20mA

OFF ON OFF OFF ON OFF 0-1V

ON ON OFF OFF ON OFF 0-5V

OFF OFF ON OFF ON OFF 0-10V

ON OFF ON OFF ON OFF 1-5V

OFF ON ON OFF ON OFF 0-20mA

ON ON ON OFF ON OFF 4-20mA

OFF OFF OFF ON ON OFF 0-1V

ON OFF OFF ON ON OFF 0-5V

OFF ON OFF ON ON OFF 0-10V

ON ON OFF ON ON OFF 1-5V

OFF OFF ON ON ON OFF 0-20mA

ON OFF ON ON ON OFF 4-20mA

OFF ON ON ON ON OFF 0-1V

ON ON ON ON ON OFF 0-5V

OFF OFF OFF OFF OFF ON 0-10V

ON OFF OFF OFF OFF ON 1-5V

OFF ON OFF OFF OFF ON 0-20mA

ON ON OFF OFF OFF ON 4-20mA

OFF OFF ON OFF OFF ON 0-100mV

ON OFF ON OFF OFF ON 0-100mV

OFF ON ON OFF OFF ON 0-100mV

ON ON ON OFF OFF ON 0-100mV

OFF OFF OFF ON OFF ON 0-100mV

ON OFF OFF ON OFF ON 0-100mV

OUTPUT

4-20mA

0-20mA

0-5V

1-5V

0-10V

2-10V

4-20mA

0-20mA

0-5V

1-5V

0-10V

2-10 V

12

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

Input+

MTL1271

5

6

2

1

+

-

System AI

2 wire Tx

system input

Input-

Load

-ve

Return

+24V Tx

Power

Limit

4-20mA

Type J or K

thermocouple

Input+

MTL1272

5

6

2

1

+

-

System AI

2 wire Tx

system input

Input-

Load

-ve

Return

+24V Tx
Power

Limit

4-20mA

3

3 wire

PT100 RTD

4 wire

PT100 RTD

Input+

Input-

5.6 MTL1271 loop powered thermocouple input converter

For use with Type J or K thermocouples. Range and thermocouple type are set by use

of DP switches on the module. The maximum load resistance is dependent on the

available power supply voltage. Max load = 50(Vs-17)

For range settings please refer to Table 1 for MTL1171/2. Note, no LED indicators are

fitted on the loop powered modules.

Note: Signal source must be isolated from mains supply.

5.7 MTL1272 loop powered RTD temperature converter

For use with PT100 type sensors. Range is set by use of DP switches on the module.

The maximum load resistance is dependent on the available power supply voltage.Max

load = 50(Vs-17)

For range settings please refer to Table 1 for MTL1171/2. Note, no LED indicators are

fitted on the loop powered modules.

Note: Signal source must be isolated from mains supply.

13

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

High Trip

Low Trip

Relay Off – Contacts open

Relay On – Contacts Closed

Relay On – Contacts Closed

Relay Off – Contacts open

Set point

Set point

6 MTL13XX TRIP AMPLIFIERS

6.1 Introduction

The trip amplifier modules all use the 17.5mm wide housing with up to 16 terminals available

for field and system connections. Power can be supplied via the DIN rail power bus, using the

PBUS17.5 power connectors, or directly into the module via screw terminals 15 and 16. Where the

power bus is being used it is recommended power is fed directly to the bus using the PBUS02

or MTL1991 power feed connections. Two trip points may be set with high or low level switching

6.2 Trip level Setting

Setting the trip level the relay switching action

must be set to High Trip or Low Trip using

the switches on the side of the module. It is

normal to set the relay so that under non-alarm

conditions the relay contacts are Before closed.

When in alarm, the relay contacts would normally

be set to open, this will also be the state when

the module is unpowered (failsafe operation).

DS4 / DS5 Off – High trip, On – Low trip

Set these switches with the module off the DIN rail.

The yellow Trip LEDs are illuminated when the relays are energised.

The switching point for either trip is set by feeding the required process trip level into the input

of the module and pressing one of the two small ‘SET’ buttons on the top of the module for the

appropriate trip. The Power and STS light will flash 5 times. The level is digitally stored in the

module and retained in the event of power loss. Pressing the SET button again will overwrite the

previous setting to the current input level that is being applied at the time.

All models also provide a 4-20mA output which can be set for current source (active) or current

sink (passive) operation as required

6.3 Label Indicators / Switches

STS RED Off normal operation. On fault. Flashing - temperature input open circuit

PWR GREEN on when power applied

Trip 1 YELLOW on when relay 1 energised

Trip 2 YELLOW on when relay 2 energised

DSx DIP switches for mode setting

SW1 Current output Sink / Source setting

STS PWR

TRIP 1 TRIP 2

MTL13xx

SET O/PSET O/P

SW1

¾ turn

14

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

6.4 Switch settings

Table 1 Trip switch settings

MTL13xx

DS4 (trip 1) DS5 (trip 2) Status

ON ON Trip alarm low

OFF OFF Trip Alarm high

Table 2

MTL137x Configuration and DIP switch settings

Model Input type DS1 DS2 DS3 DS4 DS5

Type Wire Break Wire Break Drive Trip 1 Trip 2
MTL1371 THC J Off / K On
MTL1372 RTD 4W Off 3W On
MTL1373 POT -

Table 3
MTL1371 and MTL1372 range DIP switch setting

ON/OFF

ON = Upscale

OFF = Downscale

Off High

On Low

Off High

On Low

Range THC/RTD DS6 DS7 DS8 DS9 DS10
0 to 100°C 0 0 0 0 -
0 to 150°C 0 0 0 1 -
0 to 200°C 0 0 1 0 -
0 to 350°C 0 0 1 1 -
0 to 500°C 0 1 0 0 -
0 to 650°C 0 1 0 1 -

0 to 800°C 0 1 1 0 -
0 to 1000°C (RTD max 850°C) 0 1 1 1 -

-10 to 50°C 1 0 0 0 -

-50 to 50°C 1 0 0 1 -

-50 to 100°C 1 0 1 0 -

-50 to 150°C 1 0 1 1 -

-50 to 250°C 1 1 0 0 -

-50 to 350°C 1 1 0 1 -

-200 to 600°C 1 1 1 0 -
Special (Reserved) 1 1 1 1 -

Note: Cycle power supply after setting switched

15

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

6.5 MTL1321 trip amplifier with voltage/current input and 4-20mA output

For use with 0-10V voltage or active 0-20mA current source inputs.

SW1 used to set current source or current sink 4-20mA output.

+

V Input+

V

V/I Input-

I Input+

MTL1321

1

2

4

V/I

T1 T2

D

0V +24V

I

E

4-20mA

13

-

14

+24V

15

0V

16

9

Trip 1

10

11

Trip 2

12

Source Sink

Load

-

Table 4

MTL1321 SW101 range switch settings

Input Output DS1 DS2 DS3 DS6

0-1V

OFF OFF OFF OFF

0-5V ON OFF OFF OFF

0-10V OFF ON OFF OFF

1-5V ON ON OFF OFF

4-20mA

0-20mA OFF OFF ON OFF

4-20mA ON OFF ON OFF

0-1V

OFF ON ON OFF

0-5V ON ON ON OFF

0-10V OFF OFF OFF ON

1-5V ON OFF OFF ON

0-20mA

0-20mA OFF ON OFF ON

4-20mA ON ON OFF ON

0-100mV 4-20mA OFF OFF ON ON

0-100mV 0-20mA ON OFF ON ON

2 wire Tx

system input

SW1

Load

+24V Tx

Power

Switches DS4 and DS5 set the trip action as previously described

16

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

6.6 MTL1341 trip amplifier with 4-20mA input/output

For use with 2 wire 4-20mA transmitter and 4 wire transmitters or 0-20mA current sources.

0-20mA isolated current repeat with 2 trip points. SW1 used to set current source or

current sink 4-20mA output.

4 wire

Tx

Tx+

Input

Com

MTL1341

1

2

3

+

13

4-20mA

V/I

I

T1 T2

D

E

0V +24V

-

14

+24V

15

0V

16

9

Trip 1

10

11

Trip 2

12

Source Sink

-

Load

2 wire Tx

system input

SW1

Load

+24V Tx

Power

For testing a resistance may be fitted between terminals 1 and 2 to simulate an input.

Use a resistance decade box or a current simulator if precise setting is required.

Resistance Approx. Output current

25KΩ 1mA

6KΩ 4mA

1k9KΩ 12mA

1KΩ 20mA

6.7 MTL1371 trip amplifier converter, thermocouple input/4-20mA output

For use with Type J or K thermocouples. Range set using DIP switches on the side of the module.

4-20mA current output with sink or source setting and two trip points. SW1 used to set current

source or current sink 4-20mA output

Input+

Input-

Type J or K

thermocouple

MTL1371

1

2

THC

T1 T2

D

+

13

4-20mA

I

E

-

14

+24V

15

0V

16

9

Trip 1

10

11

Trip 2

Source Sink

-

12

Load

2 wire Tx

system input

SW1

Load

+24V Tx

Power

0V +24V

17

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

6.8 MTL1372 trip amplifier converter, RTD input/4-20mA output

For use with PT100 RTDs. Range set using DIP switches on the side of the module.

4-20mA current output with sink or source setting and two trip points. SW1 used to set

current source or current sink 4-20mA output.

3 wire

PT100 RTD

Input+

Input-

4 wire

PT100 RTD

Input+

Input-

MTL1372

1

2

3

4

RTD

T1 T2

D

4-20mA

I

E

13

14

15

16

10

11

12

9

+24V

0V

+

-

Trip 1

Trip 2

wire Tx

2

system input

Source Sink

SW

1

Load

-

Load

24V Tx

+

Power

0V +24V

6.9 MTL1373 trip amplifier converter, Potentiometer input/4-20mA output

For use with 3 wire potentiometers with an end to end resistance between 100Ω and 100KΩ.

To minimise the effect of wiring resistance between the module and the potentiometer a higher value

potentiometer resistance is recommended. SW1 used to set current source or current sink 4-20mA output.

3 wire

Potenometer

input

+

Input

-

MTL

1

2

3

1373

POT

T

D

0

V +24V

1 T2

E

+

13

20

mA

4

-

I

-

14

24V

+

15

0

V

16

9

Trip

Trip

1

2

10

11

12

System AI

wire Tx

2

system input

Source Sink

SW

1

Load

-

Load

24V Tx

+

Power

18

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

7 MAINTENANCE

Note: Return any isolator identified as faulty to the Eaton’s MTL product line or representative

from which it was purchased, for repair or replacement.

7.1 Routine maintenance

Occasionally check the general condition of the installation to make sure that no deterioration has

occurred. At least once every two years (and more frequently for particularly harsh environments),

check that:

• isolators are of the types specified in the relevant documentation.

• isolators are legibly tagged and tag details given comply with the relevant

documentation.

• isolators are securely clipped to the DIN rail.

• all cable connections are properly made to the isolators.

• all connecting cables are of the specified type and rating, are correctly routed

(particularly when fitted in enclosures), and are not frayed or otherwise damaged.

• all cable screens are properly earthed.

• there is no sign of damage or corrosion.

• to clean use water based damp cloth.

7.2 Enclosures

The only enclosure maintenance required is cleaning and periodic visual inspections. Clean

external surfaces only, using soap and water, do not use chemical solvents or proprietary cleaning

fluids. Every year (more frequently in harsh environments), inspect enclosures and check that:

• they are attached securely to their mountings.

• any accumulation of water inside has been removed (using the drain plug, if fitted).

• cable gland nuts are tight.

• there are no signs of any damage.

• all connections are properly made.

8 APPENDIX A

Table 1 Isolator current consumption for MTL1991 calculation @ 24V.

Isolator Typical load current Maximum load current

MTL1141 33mA @16mA output 45mA

MTL1142 35mA @16mA output 51mA

MTL1143 50mA @16mA output 71mA

MTL1171 15mA voltage out

35mA current out

MTL1172 15mA voltage out

35mA current out

MTL1173 15mA voltage out

35mA current out

MTL1211 25mA 35mA

MTL1249 38mA 38mA

MTL13xx 55mA 80mA

40mA

40mA

40mA

19

INM MTL1000 Rev 8

DRAFT - 08 August 2017 DRAFT - 08 August 2017

THIS PAGE IS LEFT INTENTIONALLY BLANK

20

INM MTL1000 Rev 8

DRAFT - 08 August 2017

AUSTRALIA

MTL Instruments Pty Ltd,
10 Kent Road, Mascot, New South Wales, 2020, Australia

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

BeNeLux

MTL Instruments BV
Ambacht 6, 5301 KW Zaltbommel
The Netherlands

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

CHINA

Cooper Electric (Shanghai) Co. Ltd
955 Shengli Road, Heqing Industrial Park
Pudong New Area, Shanghai 201201

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

FRANCE

MTL Instruments sarl,
7 rue des Rosiéristes, 69410 Champagne au Mont d’Or
France

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

GERMANY

MTL Instruments GmbH,
Heinrich-Hertz-Str. 12, 50170 Kerpen, Germany

Tel: [phone] - 0 Fax: [phone] - 2 00
E-mail: [e-mail]

INDIA

MTL India,
No.36, Nehru Street, Off Old Mahabalipuram Road
Sholinganallur, Chennai - 600 119, India

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

ITALY

MTL Italia srl,
Via San Bovio, 3, 20090 Segrate, Milano, Italy

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

JAPAN

Cooper Crouse-Hinds Japan KK,
MT Building 3F, 2-7-5 Shiba Daimon, Minato-ku,
Tok yo, Japan 105-0012

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

NORWAY

Norex AS
Fekjan 7c, Postboks 147,
N-1378 Nesbru, Norway

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

RUSSIA

Cooper Industries Russia LLC
Elektrozavodskaya Str 33
Building 4
Moscow 107076, Russia

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

SINGAPORE

Cooper Crouse-Hinds Pte Ltd
100G Pasir Panjang Road, Interlocal Centre
#07-08 Singapore 118523

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

SOUTH KOREA

Cooper Crouse-Hinds Korea
7F. Parkland Building 237-11 Nonhyun-dong Gangnam-gu,
Seoul 135-546, South Korea.

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

UNITED ARAB EMIRATES

Cooper Industries/Eaton Corporation
Office 205/206, 2nd Floor SJ Towers, off. Old Airport Road,
Abu Dhabi, United Arab Emirates

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

UNITED KINGDOM

Eaton Electric Ltd,
Great Marlings, Butterfield, Luton
Beds LU2 8DL

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

AMERICAS

Cooper Crouse-Hinds MTL Inc.
3413 N. Sam Houston Parkway W.
Suite 200, Houston TX 77086, USA

Tel: [phone] Fax: [phone]
E-mail: [e-mail]

Eaton Electric Limited,
Great Marlings, Butterfield, Luton
Beds, LU2 8DL, UK.
Tel: + 44 (0)1582 723633 Fax: + 44 (0)1582 422283
E-mail: [e-mail]
www.mtl-inst.com

© 2018 Eaton
All Rights Reserved
Publication No. INM 1000 Rev 8 051118
November 2018

EUROPE (EMEA):

[phone]
[e-mail]

THE AMERICAS:

[phone]
[e-mail]

ASIA-PACIFIC:

[phone]
[e-mail]

The given d ata is only intended as a p roduct
descrip tion and should not be re garded as a legal
warrant y of properties or gu arantee. In the interest
of further technical developments, we reserve the
right to make de sign changes.