Dinel Clm-36 User manual

Read carefully the instructions published in this manual before the rst use of the level meter. Keep the manual

at a safe place. The manufacturer reserves the right to implement changes without prior notice.

Capacitive level meter CLM – 36Capacitive level meter CLM – 36

INSTRUCTION MANUAL

1 . Basic description .................................................................................................................... 4

2 . Areas of application ................................................................................................................. 4

3 . Sensor variants ....................................................................................................................... 5

4 . Dimensional drawings ............................................................................................................. 6

5 . E󰀨ect of tank shape on the linearity of the measurement ....................................................... 8

6 . Commissioning procedure ...................................................................................................... 9

7 . Mechanical assembly .............................................................................................................. 9

8 . Electrical connection ............................................................................................................... 12

9 . Preparing the level meter for measurement ........................................................................... 14

10 . Settings ................................................................................................................................ 15

11 . Method of marking ................................................................................................................ 17

12 . Examples of correct labeling ................................................................................................. 18

13 . Accessories ........................................................................................................................... 18

14 . Protection, safety, compatibility and explosion proof ............................................................ 18

15 . Use, operation and maintenance .......................................................................................... 19

16 . General warranty conditions ................................................................................................. 21

17 . Labeling ................................................................................................................................. 22

18. Technical parameters ............................................................................................................ 24

19 . Relative permittivity table ...................................................................................................... 28

20 . Relative permittivity table ...................................................................................................... 29



CLM–36 © Dinel, s.r.o.

4

CLM® capacitive level meters are designed for continuous level measurement of liquid and bulk

solids in tanks, storage tanks, silos, etc. They consist of a housing with removable electronics

and a measuring electrode. The electronic part converts the capacitance value into a current

signal (4 ... 20 mA) or a voltage signal (0 ... 10 V). The sensitivity can be adjusted, the initial

capacitance can be compensated and the amplication can be changed continuously.

The level meters are available in the following versions: N - for non-explosion hazardous areas,

NT - high temperature version for non-explosion hazardous areas, Xi - intrinsically safe version

for explosion hazardous areas, XiT - high temperature version for explosion hazardous areas.

CLM are o󰀨ered in variants with di󰀨erent types of process connection (threaded, Tri-Clamp).

 

All operations described in this instruction manual have to be carried out by trained personnel

or by an accredited person only. Warranty and post warranty service must be exclusively

carried out by the manufacturer.

Improper use, installation or set-up of the sensor can lead to crashes in the application.

The manufacturer is not responsible for improper use, loss of work caused by either direct

or indirect damage, and for expenses incurred at the time of installation or during the period

of use of the level sensors.

To ensure the maximum safety of management processes, we have dened the following safety and infor-

mation guidelines. Each instruction is marked with a corresponding pictogram.



This symbol informs you about particularly important instructions for installation and operation of

equipment or dangerous situations that may occur during the installation and operation. Not observing

these instructions may cause disturbance, damage or destruction of equipment or may cause injury.



This symbol indicates particularly important characteristics of the device.



This symbol indicates helpful additional information.





 

Capacitive level meters are suitable for continuous level measurement of a wide variety of liquids

and bulk materials. The level meters are resistant to all changes in the atmosphere above the

surface (vacuum, overpressure, vapour, dust).

5

 

• CLM–36_–10 Non-insulated rod electrode, for measuring the level of electrically non-

conductive liquids (oil, diesel, gasoline) and bulk solid materials (our, sand,

cement, plastic granules, etc.).

Electrode length from 0.2 m to 5 m (for materials with low permittivity εr <10,

the minimum electrode length is 0.5 m).

• CLM–36_–11 Insulated rod electrode (PFA), suitable for measuring the level of water and

other electrically conductive liquids. Also suitable for contaminated liquids in

metal tanks, concrete pits, etc.

Electrode length from 0.2 m to 3 m.

• CLM–36_–12 Insulated rod electrode (FEP), suitable for measuring the level of water and

other electrically conductive liquids. Also suitable for contaminated liquids in

metal tanks, concrete pits, etc.

Electrode length from 0.2 m to 3 m.

• CLM–36_–20 Non-insulated rod electrode with reference tube, to measure the level of

unpolluted and electrically non-conductive liquids (oil, diesel, gasoline).

Electrode length from 0.2 m to 3 m.

• CLM–36_–22 Insulated rod electrode with reference tube, for measuring the level of

clean electrically conductive liquids (e.g. in plastic and glass tanks) and for

greater demands on measurement accuracy. Electrode insulation made of

FEP material. Electrode length from 0.2 m to 3 m.

• CLM–36_–30 Non-insulated stainless steel rope electrode and weights, for measuring

the level of loose materials (sand, our, cement, etc.) Possibility of shortening

the rope. Electrode length from 1 m to 20 m.

• CLM–36_–31 Non-insulated stainless steel rope electrode and insulated dynamic

anchorage, to measure the level of bulk materials in higher silos.

Electrode length from 1 m to 20 m.

• CLM–36_–32 Insulated rope electrode (FEP) with insulated weight (FEP), designed to

measure the level of electrically conductive and non-conductive liquids.

Electrode length from 1 m to 15 m.

CLM–36 © Dinel, s.r.o.

6

 

CLM–36_–30

34

100

91

125

34

100

91

125

34

CLM–36_–10, 11, 12 CLM–36_–20, 22

* thread types: M36x2; G1"

** for materials with low permittivity (εr <10) is

minimum electrode length E500

34

100

91

125

34

thread *

high temperature design

CLM–36_T

34

100

91

125

34

7

34

100

91

125

34

connection **

34

100

91

125

34

E1000 ... E15000

152

4

ø

18

ø

CLM–36_–32 CLM–36_–31

34

100

91

125

34

rope

electrode

tank wall

(KV–31, PR–31)*

compression spring

anchor

with a ball joint

Tri-Clamp process connection

* anchoring roller KV–31 or dustproof

bushing PR–31 (see accessories)

** connection types: Tri-Clamp CI50 (ø 50.5 mm)

CLM–36 © Dinel, s.r.o.

8

 

• For curved containers (most often a horizontal

cylinder), the change in capacity when measuring

electrically non-conductive substances is non-linear.

• Linearization is performed using a concentric

reference tube (CLM – 36_–20, 22).

• For a tank with a straight wall and a probe placed

parallel to it, the capacity change is linear.

VALID FOR: CLM-36_-10, 11, 12

CLM-36_-30, 31, 32

VALID FOR: CLM-36_-20, 22

VALID FOR: all types

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 



• Level meters with an insulated electrode are equipped with a protective cap at the end of the electrode,

which must be removed before assembly.

• The level meters are mounted in a vertical position in the upper lid of the tank or reservoir, for example,

using a steel weld ON-36x2 (steel 11375), a stainless steel weld NN-36x2 (stainless steel 1.4301),

a fastening nut UM-36x2 (stainless steel 1.4301) or a Clamp-type ange.

• When mounting the level meter in a metal tank or reservoir, it is not necessary to ground the housing

separately.

• In the case of installation in concrete pits or silos, it is advisable to install the level meter on an auxiliary

metal structure (console, lid, etc.) and then connect it to a metal object that is constantly submerged, or

with steel reinforcements in concrete (reinforcement).

• When measuring the level of substances in plastic or glass containers with a level meter without a

reference tube, it is necessary to connect the grounding screw on the sensor head with an auxiliary

electrode, which is xed in a suitable way to the outer shell of the container (or to the inner wall). The

material of the auxiliary electrode should be chosen taking into account the working environment and the

properties of the substance to be measured.

E- electrode length [mm] - choose so that the

end of the electrode is immersed at least 20

mm below the lowest measured level

h- distance from the bottom - at least 50 mm

a- distance from the wall - at least approx. E/20

d- diameter of tubular auxiliary container - at

least 40 + E/20 (smaller dimensions need to

be discussed)

auxiliary electrode

width = min. 30 mm

(required only

for non-metallic

containers)

Fig. 1: Installation of level meters with a rod electrode

 

This procedure has the following three steps:

 

 

 

METAL AND NON-METAL CONTAINERS VALID FOR: CLM-36_-10, 11, 12

CLM–36 © Dinel, s.r.o.

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h - distance from the bottom - at

least 50 mm, taking into

account the possibility of the

presence of heavier fractions

(water) in oil products

k - distance from the wall - any

connect to reinforcement

E - electrode length [mm] - choose so that the end of the electrode is at least 20 mm below the lowest measured level

h - distance from the bottom - at least 100 mm

a distance from the wall - min. E/20, otherwise choose the largest possible (farthest from the wall), in the middle between the

wall and the vertical drain

concrete silo

metal tank

Fig. 2: Installation of level meter with reference pipe

Fig. 3: Installation of rope electrode level meters

VARIANTS WITH REFERENCE TUBE VALID FOR: CLM-36_-20, 22

DEEP METAL AND CONCRETE TANKS VALID FOR: CLM-36_-30, 32

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E - electrode length [mm]

t - length of the guide rod -

approx. 500 mm

p - length of compression

spring - approx. 200 mm

c - distance from the tray axis

(choose the minimum if

possible)

weld a steel anchor roller

(mat. 11375) or

a dust-tight grommet

into the hopper shell

Fig. 4: Installation of the level meter with rope electrode and anchoring

ROPE ELECTRODE WITH ANCHORING VALID FOR: CLM-36_-31

CLM–36 © Dinel, s.r.o.

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 

The level meter is connected to the evaluation device with a suitable cable with an outer diameter

of 6 to 8 mm (recommended core cross-section 0.5 to 0.75 mm2) via a removable connector with

internal screw terminals, which is included in the delivery. The connection diagram and the inside

view of the connector are shown in the pictures. A non-detachable IP67 connector with a 5 m PVC

cable can be supplied as an extra standard accessory.

Procedure for connecting the cable to the level meter:

1. Unscrew the connector from the body of the level meter using a suitable screwdriver.

2. Use a at screwdriver to pull out the inner part of the connector (insert the screwdriver into the

gap indicated by the arrow).

3. Unscrew the cable grommet and pass the supply cable inside the connector.

4. Connect the cable cores to the screw terminals according to Fig. 7 (current output 4-20 mA)

or according to Fig. 9 (voltage output 0-10 V). Tighten the clamps rmly.

5. Push the terminals back into the connector with terminal #3 facing the cable gland. Tighten

the cable gland.

6. Check the seal on the connector and connect the connector back to the meter body.

Fig. 6: Connection diagram of a level

meter with current output

shielding

(GNYE)

+U (BN)

0V (BU)

Fig. 7: Internal view of the

connector with current output

Fig. 8: Connection diagram of the level

meter with voltage output

Uout (BK) +U (BN)

shielding

(GNYE)

0V (BU)

Fig. 9: Internal view of the

connector with voltage output

Uout

13

The electrical connection can only be made in a de-energized state!

The supply voltage source must be designed as a stabilized source of low safe voltage with

galvanic separation. In the case of using a switching source, it is necessary that its design

effectively suppresses common mode interference on the secondary side. If the switching

source is equipped with a protective PE terminal, it must be earthed! Intrinsically safe devices

of the CLM–36Xi(XiT) type must be powered from an intrinsically safe source meeting the

above requirements.

Due to the possible occurrence of an electrostatic charge on the non-conductive parts of the

sensor, all CLM-36Xi(XiT) sensors intended for use in potentially explosive atmospheres must

be grounded. This can be done by grounding the el. conductive tanks, or el. conductive lid

of the tank and in the case of el. non-conductive tanks by using and grounding the auxiliary

plate electrode PDE-27.

If the sensor is located in an outdoor environment at a distance of more than 20 m from an

outdoor switchboard or from a closed building, the electrical supply to the sensor must be

supplemented with suitable overvoltage protection.

In the case of strong ambient electromagnetic interference, the connection of the supply cable

with the power line, or its length greater than 30 m, we recommend the use of a shielded

cable and grounding its shielding on the source side.

CLM–36 © Dinel, s.r.o.

14

 



1. To access the adjustment elements of the level meter, we disconnect the connector and

unscrew it union nut (pay attention to the internal connecting wires). We then connect the

connector again.

2. We connect the level meter to the power source via a milliammeter (controller, etc.).

3. We set Trimr1) 20 mA (or 10 V) to the basic position (already preset from the factory):

a) We turn it all the way to the right (clockwise).

b) We go back 3 turns to the left.

*1) Trimrs do not have stops - they are about 15 revolutions.



Fig. 10: Top view of the internal electronic part of the

level meter with current output (variant –I)

DIP switches (to set

the range)

trimr 4 mA

(for compensation

initial capacity)

trimr 20 mA

(for soft

gain setting)

BU (-) BN (+)

GNYE (shielding)

brass stirrup

(for removing the

electronic part)

DIP switches (to set

the range)

trimr 0 V

(for compensation

initial capacity) trimr 10 V

(for soft

gain setting)

BU (-) BN (+)

GNYE (shielding)

BK

(U

out

)

brass stirrup

(for removing the

electronic part)

0V 10V

Fig. 11: Top view of the internal electronic part of the

level meter with voltage output (variant –U)

explanations:

GNYE – green-yellow

BU – blue

BK – black

BU – blue

15

 



1. Empty the tank to the minimum level.

2. Using the DIP switches on the level meter, we set the 2nd range3) (250 pF).

3. Using the adjusting screwdriver, we turn the 4 mA trimmer and set the quiescent current of the

level meter to 4 mA. Turning it to the right (clockwise) increases the current, turning it to the left

decreases it. If the desired current cannot be set to 4 mA, we switch to the next higher range

using the DIP switches and set the 4 mA current to this range.

4. We ll the tank to the maximum level. If it is impossible to bring the level to the maximum state,

any known (detectable) level can be used and the current for further settings can be calculated

according to the formula:

I out = 4 + (0,16 x water level in %) [mA]

5. If the output current does not reach the value of 20 mA (or the value of I out), then we switch

to the lowest range No. 1 using the DIP switches and continue with step 7. If the output current

reaches or exceeds the value of 20 mA, we continue with step 6.

6. Using the DIP switches, we gradually switch to higher ranges and stop at the range where the

last time the value exceeded 20 mA (or the I out value), i.e. a current of 21 mA4) ows through

the sensor. At the same time, we still have the 20 mA trimmer in the basic position.

7. Using the adjusting screwdriver, we turn the 20 mA trimmer and set the current with the level

meter to 20 mA (or to the calculated value of I out - see above).

8. To achieve maximum accuracy, it is advisable to double-check the 4 mA setting.



1. Empty the tank to the minimum level.

2. Using the DIP switches on the level meter, we set the 2nd range3) (250 pF).

3. Using the adjusting screwdriver, we turn the trimmer 0 V and set the voltage at the output of the

level meter to 0 V. Turning it to the right (clockwise) increases the output voltage, turning it to

the left decreases it. If the desired voltage cannot be set to 0 V, we switch to the nearest higher

range using DIP switches and set the 0 V voltage to this range.

4. We ll the tank to the maximum level. If it is impossible to bring the level to the maximum state,

any known (detectable) level can be used and the output voltage for further settings can be

calculated according to the formula:

U out = 0,1 x water level in % [V]

5. If the output voltage does not reach the value of 10 V (or the value of U out), then we switch to

the lowest range No. 1 using the DIP switches and continue with step 7. If the output voltage

reaches the value of 10 V, we continue with step 6.

6. Using the DIP switches, we gradually switch to higher ranges and stop at the range where the

value last exceeded 10 V (or the value of U out), so the voltage at the output of the sensor is e.g.

10.5 V. At the same time, we still have the 10 V trimmer in the basic position .

CLM–36 © Dinel, s.r.o.

16

7. Using the adjusting screwdriver, we turn the 10 V trimmer and set the output voltage on the level

meter to 10 V (or to the calculated value of U out - see above).

8. To achieve maximum accuracy, it is advisable to check the 0 V setting.

Table of adjustable ranges

Range number Sensitivity 2) (C) Range 3) (R) Position of DIP switches

11) 20 pF 70 pF

230 pF 250 pF

350 pF 600 pF

4100 pF 1 200 pF

5150 pF 3 000 pF

6300 pF 7 000 pF

7500 pF 18 000 pF

81 000 pF 36 000 pF

Tables of recommended ranges depending on the measured medium and type of level meter

Medium Plastic granules (εrcca 2)