Eaton MTL K522 Operating instructions

Brand: Eaton

Model: MTL K522

Type: Operating instructions

Eaton MTL K522 is a reliable gas analyzer designed for accurate and efficient gas measurement. With its isolated 4/20mA output, it ensures safe and reliable signal transmission. It features RS232 communication, allowing for easy data retrieval and configuration. The K522 can be used in various applications, including industrial process control, environmental monitoring, and safety systems. Its compact design and rugged construction make it suitable for harsh environments. Trust Eaton MTL K522 for precise gas analysis and reliable performance.

October 2016

TN010 520-1009 Rev 3

Technical note

MTL gas analysers & systems

Eaton Electric Limited,

Great Marlings, Butterﬁeld, Luton

Beds, LU2 8DL, UK.

Tel: + 44 (0)1582 723633 Fax: + 44 (0)1582 422283

E-mail: [email protected]

www.mtl-inst.com

Publication No. TN010 520-1009 Rev 3 191016

October 2016

EUROPE (EMEA):

+44 (0)1582 723633

[email protected]

THE AMERICAS:

+1 800 835 7075

[email protected]

ASIA-PACIFIC:

+65 6 645 9888

[email protected]

The given data is only intended as a product

description and should not be regarded as a legal

warranty of properties or guarantee. In the interest

of further technical developments, we reserve the

right to make design changes.

MTL K522

grounding techniques

Introduction

This technical note is to aid the wiring on site of MTL K522

Instruments, remote sensors and communication equipment

using the RS232 interface.

Signal Grounding

The RS232 0V, Sensor Common and Supply 0V and are all

connected together internally – See Figure 1. It is important that

these terminals are not connected to external circuits at differing

potentials. This includes connections to mains earths in different

locations. The Output 4/20mA is an isolated output.

Figure 1 - Internal connections

When the RS232 port is connected to a PC, the GND terminal will

be connected to the PC case, and hence to mains earth ground.

In this case, the DC power supply for the instrument should be a

Class II or double insulated type (ie not earthed).

Chassis Grounding & Earth Grounding

Depending on the installation these might be connected together

or they might not. However for the discussion below, we have

assumed they are connected together and have ignored the earth

ground symbol.

If signal cables lengths are greater than 0.5m or close to sources

of electrical noise, instrument performance may be improved

by using screened cables. In this case the screens should be

terminated at one (the same) end to a single bonding point (ie

RS232 D type shield if this linked to earth). See Figure 2.

Figure 2 - Cable screening method

If the serial interface is not connected then it is advised to connect

the (–) 0v side of the DC supply to the earth bonding point.

See Figure 3

Figure 3 - Alternative cable screening method

In either of the cases above, the sensor is isolated from its metal

enclosure and will therefore not cause any external connection to

chassis ground or earth ground.

1 RX (In)

2 TX (Out)

3 CTS (In)

4 RTS (Out)

5 0V

6 Common (Green)

7 Reference (Red)

8 Measure (Blue)

9 NC

10 NC

11 NC

12 NC

13 Supply (+)24Vdc

14 Supply (-) 0V

15 4/20 mA (+) ve

16 4/20 mA (-) ve

RS232

Sensor

Supply

Output

(internaly connected)

RS232

Communications

Sensor

Power supply

Output

Function:

1 RX (In)

2 TX (Out)

3 CTS (In)

4 RTS (Out)

5 0V

6 Common (Green)

7 Reference (Red)

8 Measure (Blue)

9 NC

10 NC

11 NC

12 NC

13 Supply (+) 24Vdc

14 Supply (-) 0V

15 4/20 mA (+) ve

16 4/20 mA (-) ve

RS232

Sensor

Supply

Output

Shield

1 RX (In)

2 TX (Out)

3 CTS (In)

4 RTS (Out)

5 0V

6 Common (Green)

7 Reference (Red)

8 Measure (Blue)

9 NC

10 NC

11 NC

12 NC

13 Supply (+) 24Vdc

14 Supply (-) 0V

15 4/20 mA (+) ve

16 4/20 mA (-) ve

RS232

Sensor

Supply

Output

Eaton MTL K522 Operating instructions

Eaton MTL K522 Operating instructions

Eaton MTL K522 Operating instructions

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