Emerson Rosemount 2120 Konfigurationshandbuch

Manual Supplement

00809-0200-4030, Rev BA

November 2012

Replacement and Calibration of

Rosemount 2120 Electronic Cassettes

November 2012

Manual Supplement

NOTICE

Refer to the Rosemount 2120 Reference Manual (Document Number 00809-0100-4030) for

more instructions. Manuals are available electronically on www.rosemount.com.

Failure to follow these installation guidelines could result in death or serious injury

The Rosemount 2120 is a liquid level switch. It must be installed, connected, commissioned,

operated, and maintained by suitably qualified personnel only, observing any national and

local requirements that may apply

Ensure the wiring is suitable for the electrical current and the insulation is suitable for the

voltage, temperature, and environment

Use the equipment only as specified. Failure to do so may impair the protection provided by

the equipment

Any substitution of non-recognized parts may jeopardize safety and is under no

circumstances allowed

Explosions could result in death or serious injury

Installation of the 2120 in a hazardous environment must be in accordance with the

appropriate local, national, and international standards, codes, and practices. Please review

the Product Certifications section for any restrictions associated with a safe installation

Verify that the operating atmosphere of the 2120 is consistent with the appropriate

hazardous locations certifications

External surface may be hot

Care must be taken to avoid possible burns

Process leaks could result in death or serious injury

Install and tighten process connectors before applying pressure

Do not attempt to loosen or remove process connectors while the 2120 is in service

Electrical shock could cause death or serious injury

If the liquid level switch is installed in a high voltage environment and a fault condition or

installation error occurs, high voltage may be present on leads and terminals

Use extreme caution when making contact with the leads and terminals

Make sure that power to the 2120 is off while making connections

Manual Supplement

November 2012

Replacement and calibration of electronic cassettes

When replacing a damaged or faulty cassette, it is necessary to calibrate the

replacement cassette to the operating frequency of the fork assembly.

Replacement sequence

If this replacement is taking place in a hazardous area, only qualified personnel should

perform the replacement. All work in hazardous areas must be carried out in

accordance to national and local codes of practice. Refer to the Rosemount 2120

manual (00809-0100-4030) for product certifications and safety instructions for

specific hazardous area installations.

Calibration of this device is complex and it may take several attempts before

calibration is successful.

On Intrinsically Safe (I.S.) approved versions of the 2120, it is recommended that

replacement and calibration be performed in a non-hazardous (safe) area.

Note

In I.S. applications, NAMUR cassettes can only be replaced with NAMUR cassettes,

and 8/16 mA cassettes can only be replaced by 8/16 mA cassettes

Non-I.S. cassettes can be interchanged with other non-I.S. cassettes, but the new

label must be fitted and the original part number transferred to the new label

(see “Electrical installation” on page 7 for connections to the electronic cassettes)

Before starting the replacement and calibration procedure, ensure that any controlled

process will not be adversely affected

To replace the cassette, do the following:

1. Isolate and disconnect the power to the Rosemount 2120, and insulate the ends of

the wires. On a 2120 with a relay cassette, there may be more than one power

source.

2. Remove the cover and disconnect the wires, noting any connections (Figure 1) and

the exact mode switch position (Figure 2) on the cassette to be replaced.

3. Remove and retain the two fixing screws from the base of the cassette and unplug

the cassette.

4. Plug in the replacement cassette, refit the screws, reconnect the wires, and set the

mode switch to “Wet On” with a one second delay (Figure 3).

5. Reconnect the power to the 2120.

6. Proceed to “Calibration sequence” on page 5.

Figure 1. Top-down view of example cassette inside the housing

A. LED

B. Mode Switch and Time Delay

OPERATION MODE

Dry On Mode

Dry

Wet

Wet On Mode

Dry

Wet

Dry On Wet On

Seconds Delay

0.3 0.3

123

OUT

PLC/PNP

Isolate Supply

Before Removing

November 2012

Manual Supplement

Figure 2. Mode switch and setting on the existing cassette

This is an example of how the existing cassette may look.

Here, the switch is set to “Dry On” with a one second delay.

Take note of the actual setting.

SETTING IS: ___________________________

Figure 3. Mode switch setting on the replacement cassette

Set the mode switch of the new cassette to “Wet On” with a

one second delay.

Dry On Wet On

Seconds Delay

0.3 0.3

Dry On Wet On

Seconds Delay

0.3 0.3

10 3

Manual Supplement

November 2012

Calibration sequence

This section describes what is required for calibration. Calibration sequence steps 3 to

13 are time dependent and must be carried out within the noted times. The purpose of

the time dependency and switching sequence is to prevent an accidental calibration

from occurring.

To calibrate the cassette, do the following:

1. Ensure that the forks are dry, and the mode switch is set to “Wet On” with a one

second time delay (Figure 3).

2. Check that the LED is flashing at a rate of one flash per second.

If it is on continuously, proceed to step 8.

3. Apply magnet to the test-point (as shown on page 6).

4. After a one second delay, the LED will be lit continuously.

5. Within one second, rotate the mode switch two steps clockwise.

6. After a two second delay, the LED will go out.

7. Within three seconds, rotate the mode switch two steps counter-clockwise.

Proceed to step 13.

8. Apply magnet to test point (as shown on page 6).

9. After a one second delay, the LED will flash at a rate of one flash per second.

10. Within one second, rotate the mode switch two steps clockwise.

11. After a two second delay, the LED will go out (stop flashing).

12. Within three seconds, rotate the mode switch two steps counter-clockwise.

13. After a two second delay, the LED should flash twice per second.

14. If the LED is flashing twice per second, the calibration has occurred correctly.

Remove the magnet from the test-point. After a one second delay, the unit will

return to normal operation. Proceed to step 17.

15. If the LED is flashing once per second or it is on continuously, the calibration has

failed. Remove the magnet from the test-point, wait ten seconds, and then repeat

from step 2.

16. If the LED stays off after the two second delay of step 13, the sensor is not working

correctly. Check that the sensor forks are clean and dry. Also, verify there is nothing

jamming or touching the sensor. If no fault is found with the sensor, the entire unit

should be returned for repair.

17. Set the mode switch to the original setting noted in Figure 2 and wait five seconds.

18. Replace the cover and check that the system works.

November 2012

Manual Supplement

Figure 4. Magnetic test point (metal housing)

Figure 5. Magnetic test point (glass-filled nylon housing)

TP TP

(OUTPUT ON)

(OUTPUT OFF)

NO MAGNET MAGNET

20 - 264Vac

50 - 60Hz 2VA

20 - 60Vdc 0.5W

Output Rating:

Load 20 - 500mA

Supply

www.rosemount.com

MAX PROCESS TEMPERATURE:150°C

MADE IN UNITED KINGDOM

MAX WORKING PRESSUREAT 20°C: 0.25 bar

DIRECT LOAD SWITCHING

MAGNETIC

TEST

POINT

41001029

*41001029*

2120D0AS1NAAA

20 - 264Vac

50 - 60Hz 2VA

20 - 60Vdc 0.5W

Output Rating:

Load 20 - 500mA

Supply

www.rosemount.com

MAX PROCESS TEMPERATURE:150°C

MADE IN UNITED KINGDOM

MAX WORKING PRESSUREAT 20°C: 0.25 bar

DIRECT LOAD SWITCHING

MAGNETIC

TEST

POINT

41001029

*41001029*

2120D0AS1NAAA

MAGNETIC

TEST

POINT

(OUTPUT ON)

(OUTPUT OFF)

NO MAGNET MAGNET

Manual Supplement

November 2012

Electrical installation

Before use, check that suitable cable glands and blanking plugs are fitted and

fully tightened.

Isolate supply before connecting the switch or removing the electronics.

The Protective Earth (PE) terminal must be connected to an external

earthing system.

Direct load switching electronics cassette (two-wire, red label)

High level Dry = ON Low level Wet = ON

LED on continuously LED flashes each

second LED on continuously LED flashes each

second

Direct Load

Switching

WARNING

Isolate Supply

Before Removing

OPERATION MODE

Dry On Mode

Dry

Wet

Wet On Mode

Dry

Wet

Dry On Wet On

Seconds Delay

0.3 0.3

123

LINE

LOAD

(Ground)

Neutral Live

Fuse 2A(T)

R = External load (must be fitted)

U = 20 - 264V ~(ac) (50/60Hz)

OFF

< 4

mA at 20 °C (24 - 230 Vac)

OFF

< 6

mA at -40 to 80 °C (20 - 264 Vac)

20 -

500

U = 20 - 60 V (dc

)

OFF

< 4 mA

20 -

500 mA

DPST

= 5 A, 40 ms (inrush)

= Load On

= Load Off

Dry On Wet On

Seconds Delay

0.3 0.3

Dry On Wet On

Seconds Delay

0.3 0.3

10 3

U

N L

0V +V

Fuse

2A(T)

12V

DPST

Fuse

2A(T)

N L

0V +V

<4mA

DPST

U

N L

0V +V

Fuse

2A(T)

IL12V

DPST

Fuse

2A(T)

N L

0V +V

<4mA

DPST

November 2012

Manual Supplement

PNP/PLC electronics cassette (three-wire, yellow label)

High level Dry = ON Low level Wet = ON

PLC (positive input)PNP dc

LED on

continuously

LED flashes each

second LED on

continuously LED flashes each

second

OPERATION MODE

Dry On Mode

Dry

Wet

Wet On Mode

Dry

Wet

Dry On Wet On

Seconds Delay

0.3 0.3

123

OUT

PLC/PNP

Isolate Supply

Before Removing

(Ground)

0VO/P

U = 20- 60 V (dc)

I < 4 mA +I

(

MAX

)= 0 -500 mA

OUT(ON)

U - 2.5 Vac (20 °C)

L(OFF)

< 100A

Fuse 2A(T)

= 5 A, 40 ms (inrush)

OUT(ON)

U - 2.75 Vac (-40 to 80 °C)

Dry On Wet On

Seconds Delay

0.3 0.3

Dry On Wet On

Seconds Delay

0.3 0.3

10 3

OUT

PLC

I/P

U

<3V I

OUT

PLC

I/P

<100 A

OUT

PLC

I/P

U

<3V I

OUT

PLC

I/P

<100 A

OUT

U

<3V

Fuse

1A(T)

OUT

Fuse

1A(T)

< 100 A

OUT

U

<3V

Fuse

1A(T)

OUT

Fuse

1A(T)

< 100 A

Manual Supplement

November 2012

Relay output electronics cassette (DPCO, green label)

High level Dry = ON Low level Wet = ON

LED on continuously LED flashes each

second LED on continuously LED flashes each

second

NC CNO

NC NO

789

NOCNC

RELAY

123

456

NOCNC

OPERATION MODE

Dry On

Dry

Wet

Wet On

Dry

Wet

Dry On Wet On

Seconds Delay

0.3 0.3

Isolate Supply Before RemovingWarning

Resistive Load

cos φ= 1 ;

L/R = 0 ms

Inductive Load

Fuse 0.5 (T)PE

(Ground)

DPST

0V +V

Live U = 20...264 V ~ (ac)

(50/60 Hz)

U = 20...60 V (dc)

I < 6 mA

IMAX = 5 A

UMAX = 250 V

PMAX = 1250 VA

UMAX = 30 V

PMAX = 240 W

cos φ= 0.4 ;

L/R = 7 ms

IMAX = 3.5 A

UMAX = 250 V

PMAX = 875 VA

UMAX = 30 V

PMAX = 170W

Dry On Wet On

Seconds Delay

0.3 0.3

Dry On Wet On

Seconds Delay

0.3 0.3

10 3

NC NOC

NC NOCNC NOC

NC NOC

NC NOCNC NOC

NC NOC

November 2012

Manual Supplement

NAMUR electronics cassette (light blue label)

Note

This cassette is suitable for Intrinsically Safe applications and requires a certified

isolating barrier. See the Rosemount 2120 Reference Manual (00809-0100-4030)

for Intrinsically Safe approvals

This electronics cassette is also suitable for non-hazardous (safe) area applications.

It can only be interchanged with the 8/16 mA cassette.

Do not exceed 8 Vdc

High level Dry = ON Low level Wet = ON

LED on continuously LED flashes each

second

LED on continuously LED flashes each

second

OPERATION MODE

Dry On Mode

Dry

Wet

Wet On Mode

Dry

Wet

Dry On Wet On

Seconds Delay

0.3 0.3

EN 50227 / NAMUR

ION =2.2 ... 2.5 mA

IOFF = 0.8 ... 1.0 mA

A certified intrinsically safe

isolating amplifier to IEC 60947-5-6

Dry On Wet On

Seconds Delay

0.3 0.3

Dry On Wet On

Seconds Delay

0.3 0.3

10 3

>2.2 mA

<1.0 mA

>2.2 mA

<1.0 mA

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